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Journal articles on the topic 'Telescopes; Hubble; Space'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

Lotz, Jennifer. "The Frontier Fields: Past, Present, and Future." Proceedings of the International Astronomical Union 11, A29B (2015): 751–54. http://dx.doi.org/10.1017/s1743921316006712.

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AbstractExceptionally deep observations of the distant universe with the Hubble Space Telescope have consistently pushed the frontiers of human knowledge. How deep can we go? What are the faintest and most distant galaxies we can see with the Hubble Space Telescope now, before the launch of the James Webb Space Telescope? This is the challenge taken up by the Frontier Fields, a director's discretionary time campaign with HST and the Spitzer Space Telescope to see deeper into the universe than ever before. The Frontier Fields combines the power of HST with the natural gravitational telescopes o

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Gavras, P., A. Z. Bonanos, I. Bellas-Velidis, et al. "The Hubble Catalog of Variables." Proceedings of the International Astronomical Union 12, S325 (2016): 369–72. http://dx.doi.org/10.1017/s1743921316012746.

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AbstractThe Hubble Catalog of Variables (HCV) is a 3 year ESA funded project that aims to develop a set of algorithms to identify variables among the sources included in the Hubble Source Catalog (HSC) and produce the HCV. We will process all HSC sources with more than a predefined number of measurements in a single filter/instrument combination and compute a range of lightcurve features to determine the variability status of each source. At the end of the project, the first release of the Hubble Catalog of Variables will be made available at the Mikulski Archive for Space Telescopes (MAST) an

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Rowan-Robinson, Michael. "The Invisible Universe." Culture and Cosmos 16, no. 1 and 2 (2012): 255–59. http://dx.doi.org/10.46472/cc.001216.0241.

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With our own eyes we can see the night sky of the stars, planets and the Milky Way, the arena of pre-telescopic astronomy. Modern optical telescopes have opened up the universe of galaxies and we are familiar with the superb images of the Hubble Space Telescope. But with the invisible wavelengths of radio, infrared and X-ray, a very different universe comes into view. The astronomy of the invisible wavelengths was inaugurated by William Herschel in 1800 but developed very slowly over the next 160 years. The past fifty years have seen an explosion in our understanding of this strange world.

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Mould, Jeremy. "Variable Stars and the Cosmic Distance Scale." International Astronomical Union Colloquium 111 (1989): 169–76. http://dx.doi.org/10.1017/s0252921100011507.

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For three quarters of a century pulsating variable stars have lain at the foundation of the extragalactic distance scale. The construction of larger telescopes, advances in detector technology, hard work by observers, and our understanding of stellar structure have all contributed to the expansion of the realm of the Cepheids to the distance of M101. Now, with the advent of Hubble Space Telescope (HST), we can look forward to the detection of Cepheids in the Virgo cluster and the removal of much of the remaining uncertainty in the Hubble constant.

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Koen, C. "Die Hubble-Ruimteteleskoop: ’n Kort Oorsig." Suid-Afrikaanse Tydskrif vir Natuurwetenskap en Tegnologie 18, no. 3 (1999): 97–100. http://dx.doi.org/10.4102/satnt.v18i3.728.

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Van Breugel, W. J. M. "HST and KECK Observations of High Redshift Radio Galaxies." Symposium - International Astronomical Union 175 (1996): 577–80. http://dx.doi.org/10.1017/s0074180900081900.

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Together with several of my colleagues I have embarked on a comprehensive program to study the radio–aligned restframe UV structures in high redshift radio galaxies (HzRGs) using some of the world's premier optical telescopes: the Hubble Space Telescope for high spatial resolution imaging, and the Keck 10m telescope for high S/N spectropolarimetry. I will discuss some of our latest results from these observations which elucidate, and at the same time obscure, our evolving understanding of HzRGs.

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Williams, Robert. "The Hubble Deep Field." Highlights of Astronomy 11, no. 1 (1998): 1–15. http://dx.doi.org/10.1017/s1539299600019912.

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Great progress has been made in recent years in understanding the large-scale structure of the universe. Recall that it is only within this century that we have even come to realize the existence of other galaxies as separate entities. Until the 1920’s the universe did not extend beyond the Milky Way. Novae and Cepheid variables changed that picture, and for the past 75 years extragalactic astronomy has been one of the most active and fertile areas of science. The concept of an expanding universe and its beginning in a Big Bang all derive from the discovery of external galaxies.Distant galaxie

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Karachentsev, I. D., and V. E. Karachentseva. "Are There AGNs in the Nearby Dwarf Galaxies?" International Astronomical Union Colloquium 184 (2002): 325–34. http://dx.doi.org/10.1017/s0252921100030979.

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AbstractThe presence or absence of a nucleus is considered for a sample of galaxies limited by distance, not by flux. For the 365 nearest galaxies situated within a distance of ~7 Mpc, classification of their central regions is based on large-scale images obtained with the Hubble Space Telescope as well as with the 6-m and other large ground-based telescopes. Occurrence of nucleated galaxies is considered as a function of their luminosity, morphological type and other global properties.

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Takami, Michihiro, Jeremy Bailey, Antonio Chrysostomou, Motohide Tamura, and Hiroshi Terada. "Probing AU-scale Structure using Spectro-astrometry." Symposium - International Astronomical Union 221 (2004): 417–24. http://dx.doi.org/10.1017/s0074180900241855.

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The circumstellar environment within 10 AU of young stars are of particular interest for star and planet formation. Unfortunately, present imaging facilities such as the Hubble Space Telescope or adaptive optics on 10-m telescopes cannot resolve this region. We have proved that “spectro-astrometry” is a powerful technique for discovering pre-main-sequence binaries, determining kinematics of outflows and providing evidence for gaps in circumstellar disks — all down to AU scales. In this paper, we summarise our progress to date.

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Tuohy, Ian R. "Space Telescopes: an International Perspective." Publications of the Astronomical Society of Australia 8, no. 1 (1989): 2–24. http://dx.doi.org/10.1017/s1323358000022827.

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AbstractThe purpose of this paper is to review current and planned Space Astronomy missions from an international perspective, with principal attention to the programs of the USA, Europe, Japan and the USSR. The review focusses on extra-solar astrophysics, and the capabilities and broad research objectives of numerous individual spacecraft are described. These collectively span more than seventeen decades in wavelength and thus provide an essential complement to ground-based astronomy. Many of the missions offer significant opportunities for Australian participation via three complementary rou

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Lutz, Julie H. "Distances to Planetary Nebulae." Symposium - International Astronomical Union 131 (1989): 65–72. http://dx.doi.org/10.1017/s0074180900137659.

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Finding distances to planetary nebulae remains a frustrating undertaking, but significant progress has been made over the past several years. This review covers primarily work done on distances since 1980, with some references to earlier papers. Some interesting new methods have been tried recently and some methods that have been used for years have been refined. Missions such as the Hubble Space Telescope and Hipparcos may provide new data on distances. Advances in ground-based telescopes and instruments will make possible new studies of distances.

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Bonanos, A. Z., M. Yang, K. V. Sokolovsky, et al. "The Hubble Catalog of Variables (HCV)." Astronomy & Astrophysics 630 (September 25, 2019): A92. http://dx.doi.org/10.1051/0004-6361/201936026.

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Aims. Over its lifetime and despite not being a survey telescope, the Hubble Space Telescope (HST) has obtained multi-epoch observations by multiple, diverse observing programs, providing the opportunity for a comprehensive variability search aiming to uncover new variables. We have therefore undertaken the task of creating a catalog of variable sources based on archival HST photometry. In particular, we have used version 3 of the Hubble Source Catalog (HSC), which relies on publicly available images obtained with the WFPC2, ACS, and WFC3 instruments onboard the HST. Methods. We adopted magnit

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Spencer, John. "Io’s Volcanos: Latest Results from Galileo and from the Earth." Highlights of Astronomy 12 (2002): 611–13. http://dx.doi.org/10.1017/s1539299600014386.

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AbstractThree recent close flybys of Io by the Galileo spacecraft, and new observations from the Hubble Space Telescope and ground-based telescopes, have greatly advanced our understanding of Jupiter’s volcanic moon Io. Io’s volcanos are much hotter than previously suspected, perhaps requiring exotic silicate magma compositions. Despite much new data, Io’s largest volcano, Loki, is still poorly understood. New data on Io’s plumes suggest the existence of two types of plumes: primary plumes, relatively rich in S2gas, which are emitted where magma first reaches the surface, and secondary plumes,

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Peterson, Bradley M. "Space Telescope and Optical Reverberation Mapping Project: A Leap Forward in Reverberation Mapping." Proceedings of the International Astronomical Union 12, S324 (2016): 215–18. http://dx.doi.org/10.1017/s1743921316012680.

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AbstractIn 2014, a 179-orbit allocation of Hubble Space Telescope time anchored a massive reverberation-mapping program on the well-studied Seyfert 1 galaxy NGC 5548. Supporting imaging and spectrophotometric observations were provided by Swift, Chandra, Spitzer, and a world-wide network of ground-based telescopes. Understanding the data remains a significant challenge, partly because the level of detail is far beyond what has been seen before and partly because the behavior of the AGN was not typical of its past behavior. Based on analysis to date, the following conclusions can be reached: (1

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Tolstoy, Eline. "Dwarf Galaxies in the Local Group." Proceedings of the International Astronomical Union 5, S262 (2009): 119–26. http://dx.doi.org/10.1017/s1743921310002632.

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AbstractWithin the Local Universe galaxies can be studied in great detail star by star. The Color-Magnitude Diagram synthesis analysis method is well established as the most accurate way to determine the detailed star formation history of galaxies going back to the earliest times. This approach received a significant boost from the exceptional data sets that wide field CCD imagers on the ground and the Hubble Space Telescope could provide. Spectroscopic studies using large ground based telescopes such as VLT, Magellan, Keck and HET have allowed the determination of abundances and kinematics fo

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Bellini, Andrea. "Internal kinematics of Globular Clusters: Current state of the art, issues, and what to expect from the future." Proceedings of the International Astronomical Union 14, S351 (2019): 408–11. http://dx.doi.org/10.1017/s1743921319007348.

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AbstractThe advent of the Gaia mission is bringing astrometry to a new renaissance. Although Gaia will make important breakthroughs in many different scientific areas, stars in the crowded central fields of globular clusters (GCs) and at the faint end of the color-magnitude diagram are and will be out of Gaia’s reach. The Hubble Space Telescope (HST) is an excellent astrometric tool that has allowed us to distinguish and measure positions and brightness of faint stars in pencil-beam fields down to the very center of some GCs. Gaia and HST are two wonderful, complementary tools, but are yet far

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Calamida, Annalisa. "Time-series photometry of a new set of candidate faint spectrophotometric standard DA white dwarfs." Proceedings of the International Astronomical Union 14, A30 (2018): 493. http://dx.doi.org/10.1017/s1743921319005209.

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Future facilities and deep surveys such as LSST, JWST and WFIRST, will require a network of standards faint enough to avoid saturation and homogenously distributed in both hemispheres. DA white dwarfs have almost pure hydrogen atmospheres and they are the simplest stars to model. The opacities are known from first principles, and for temperatures higher than ∼ 20,000 K, their photospheres are purely radiative and should be photometrically stable. DA white dwarfs are then the best candidates to establish a network of faint spectrophotometric standards. In order to provide standards in the dynam

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Stolte, Andrea, and Wolfgang Brandner. "Proper-motion studies of Milky Way starburst clusters – a new definition of starburst cluster templates." Proceedings of the International Astronomical Union 5, S266 (2009): 123–28. http://dx.doi.org/10.1017/s1743921309990962.

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AbstractStarburst clusters in the Milky Way have the advantage that individual stars down to subsolar masses can be resolved. Thus far, field contamination along the line of sight towards the Galactic Centre and spiral arms was the limiting factor in deriving an unbiased census of the stellar population in Milky Way starbursts and, hence, the spatial extent and initial mass function in starburst clusters. As the next generation of telescopes with higher sensitivity and spatial resolution are being developed, these resolved clusters become increasingly important as templates for young, massive

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Vanzella, E., M. Meneghetti, G. B. Caminha, et al. "Candidate Population III stellar complex at z = 6.629 in the MUSE Deep Lensed Field." Monthly Notices of the Royal Astronomical Society: Letters 494, no. 1 (2020): L81—L85. http://dx.doi.org/10.1093/mnrasl/slaa041.

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ABSTRACT We discovered a strongly lensed (μ ≳ 40) Ly α emission at z = 6.629 (S/N ≃ 18) in the MUSE Deep Lensed Field (MDLF) targeting the Hubble Frontier Field (HFF) galaxy cluster MACS J0416. Dedicated lensing simulations imply that the Ly α emitting region necessarily crosses the caustic. The arc-like shape of the Ly α extends 3 arcsec on the observed plane and is the result of two merged multiple images, each one with a de-lensed Ly α luminosity L ≲ 2.8 × 1040 erg s−1 arising from a confined region (≲150 pc effective radius). A spatially unresolved Hubble Space Telescope(HST) counterpart i

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Jenkins, Edward B. "3A. Ultraviolet Astronomy (Non-IUE)." Transactions of the International Astronomical Union 20, no. 01 (1988): 608–14. http://dx.doi.org/10.1017/s0251107x00007422.

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Results from the IUE satellite, summarized in the section which follows this one, continue to dominate the literature for research topics which rely on observations in the ultraviolet. This trend may be accentuated in the near future, as we experience the natural attrition of papers based on results from previous major missions which are no longer operating, such as TD-1, Copernicus, ANS and BUSS. The Challenger accident on January 28, 1986 abruptly halted flights of new orbital facilities which depend on the Space Shuttle and has created long and somewhat indefinite postponements in the event

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Lagadec, Eric. "AGBs, Post-AGBs and the Shaping of Planetary Nebulae." Galaxies 6, no. 3 (2018): 99. http://dx.doi.org/10.3390/galaxies6030099.

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During the last decades, observations, mostly with the Hubble Space Telescope, have revealed that round Planetary Nebulae were the exception rather than rule. A huge variety of features are observed, such as jets, discs, tori, showing that the ejection of material is not due to isotropic radiation pressure on a spherical shell and that more physics is involved. This shaping process certainly occur early in the evolution of these low and intermediate mass stars and must leave imprints in the evolutionary stages prior the PN phase. Thanks to news instruments on the most advanced telescopes (e.g.

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Forbes, Duncan A., and Lee Spitler. "The formation and evolution of bulges as traced by globular cluster systems." Proceedings of the International Astronomical Union 3, S245 (2007): 281–84. http://dx.doi.org/10.1017/s1743921308017912.

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AbstractGlobular Clusters provide a unique method for tracing the formation and evolution of their host galaxies. As single stellar populations they are far easier to interpret than the multi-population complexity of galaxy field stars. The scaling properties of globular clusters provide important constraints on the hierarchical assembly history of galaxies. Here we briefly review recent progress using the Hubble Space Telescope for imaging and the Keck plus Gemini telescopes for spectroscopy. We argue that the red, or metal-rich, subpopulation of GCs is associated with the bulge/spheroid comp

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FREEDMAN, W. L. "THE MEASURE OF COSMOLOGICAL PARAMETERS." International Journal of Modern Physics A 17, supp01 (2002): 58–69. http://dx.doi.org/10.1142/s0217751x02013010.

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New, large, ground and space telescopes are contributing to an exciting and rapid period of growth in observational cosmology. The subject is now far from its earlier days of being data-starved and unconstrained, and new data are fueling a healthy interplay between observations and experiment and theory. I report here on the status of measurements of a number of quantities of interest in cosmology: the expansion rate or Hubble constant, the total mass-energy density, the matter density, the cosmological constant or dark energy component, and the total optical background light.

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de Jaeger, T., L. Galbany, S. González-Gaitán, et al. "Studying Type II supernovae as cosmological standard candles using the Dark Energy Survey." Monthly Notices of the Royal Astronomical Society 495, no. 4 (2020): 4860–92. http://dx.doi.org/10.1093/mnras/staa1402.

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ABSTRACT Despite vast improvements in the measurement of the cosmological parameters, the nature of dark energy and an accurate value of the Hubble constant (H0) in the Hubble–Lemaître law remain unknown. To break the current impasse, it is necessary to develop as many independent techniques as possible, such as the use of Type II supernovae (SNe II). The goal of this paper is to demonstrate the utility of SNe II for deriving accurate extragalactic distances, which will be an asset for the next generation of telescopes where more-distant SNe II will be discovered. More specifically, we present

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Perlman, Eric S., Devon Clautice, Sayali Avachat, et al. "Unraveling the Physics of Quasar Jets: Optical Polarimetry and Implications for the X-ray Emission Process." Galaxies 8, no. 4 (2020): 71. http://dx.doi.org/10.3390/galaxies8040071.

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Since the launch of Chandra twenty years ago, one of the greatest mysteries surrounding Quasar Jets is the production mechanism for their extremely high X-ray luminosity. Two mechanisms have been proposed. In the first view, the X-ray emission is inverse-Comptonized CMB photons. This view requires a jet that is highly relativistic (bulk Lorentz factor >20–40) on scales of hundreds of kiloparsecs, and a jet that is comparably or more powerful than the black hole’s Eddington luminosity. The second possibility is synchrotron emission from a high-energy population of electrons. This requires a

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Taylor, A. R. "Low Frequency Science with the Square Kilometre Array." Symposium - International Astronomical Union 199 (2002): 459–66. http://dx.doi.org/10.1017/s0074180900169578.

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Over the past several years an international community of scientists and engineers has emerged with a common goal to solve the technical challenge required to construct a giant radio telescope with a collecting area of one square kilometre. The Square Kilometre Array (SKA) will have a hundred times more collecting area than our most powerful existing radio telescopes, providing sensitivity of a few tens of nanoJy in the centimetre/decimetre wavelength continuum. With a spatial resolution better than the Hubble Space Telescope, a field of view larger than the full moon, and the ability to simul

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Nataf, David M., Shunsaku Horiuchi, Guglielmo Costa, et al. "The predicted properties of helium-enriched globular cluster progenitors at high redshift." Monthly Notices of the Royal Astronomical Society 496, no. 3 (2020): 3222–34. http://dx.doi.org/10.1093/mnras/staa1351.

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ABSTRACT Globular cluster progenitors may have been detected by Hubble Space Telescope, and are predicted to be observable with James Webb Space Telescope (JWST) and ground-based extremely large telescopes with adaptive optics. This has the potential to elucidate the issue of globular cluster formation and the origins of significantly helium-enriched subpopulations, a problem in Galactic astronomy with no satisfactory theoretical solution. Given this context, we use model stellar tracks and isochrones to investigate the predicted observational properties of helium-enriched stellar populations

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Vink, Jorick S. "Star Formation in the Ultraviolet." Galaxies 8, no. 2 (2020): 43. http://dx.doi.org/10.3390/galaxies8020043.

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With the launch of JWST and the upcoming installation of extremely large telescopes, the first galaxies in our Universe will finally be revealed. Their light will be dominated by massive stars, which peak in in the ultra-violet (UV) part of the electromagnetic spectrum. Star formation is the key driver of the evolution of our Universe. At young ages, within 10 Million years, both high and low mass stars generate complex UV emission processes which are poorly understood yet are vital for interpreting high red-shift line emission. For these reasons, the Hubble Space Telescope (HST) will devote 1

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Koo, D. C. "A Glimpse of Field Galaxies at Redshifts z ∼ 1 using HST and the Keck Telescope." Symposium - International Astronomical Union 171 (1996): 217–20. http://dx.doi.org/10.1017/s0074180900232385.

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Data from the Keck and Hubble Space Telescopes have been combined to explore the nature of very faint I > 22 field galaxies. At a redshift z ∼ 1, such galaxies have luminosities similar to that of typical galaxies today. Though small, our sample of 33 redshifts already suggest that the median redshift for I > 22 galaxies is higher than the z = 0.6 expected for the “maximum merger model” of Carlberg (1995). At redshifts z > 0.8, mergers, interactions, and infall of minor galaxies into larger hosts appear to be common events; a wide diversity of morphological types existed; and some ste

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Raney, Catie A., Charles R. Keeton, Sean Brennan, and Hsin Fan. "Systematic versus statistical uncertainties in masses and magnifications of the Hubble Frontier Fields." Monthly Notices of the Royal Astronomical Society 494, no. 4 (2020): 4771–93. http://dx.doi.org/10.1093/mnras/staa921.

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ABSTRACT The Hubble Frontier Fields data, along with multiple data sets obtained by other telescopes, have provided some of the most extensive constraints on cluster lenses to date. Multiple lens modelling teams analyzed the fields and made public a number of deliverables. By comparing these results, we can then undertake a unique and vital test of the state of cluster lens modelling. Specifically, we see how well the different teams can reproduce similar magnifications and mass profiles. We find that the circularly averaged mass profiles of the fields are remarkably constrained (scatter $\lt

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Hammel, Heidi B. "HST imaging of Jupiter shortly after each impact: Plumes and fresh sites." International Astronomical Union Colloquium 156 (May 1996): 111–20. http://dx.doi.org/10.1017/s0252921100115477.

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During the first few hours after each impact, numerous phenomena were observed with telescopes on Earth, in orbit, and in space. The primary events in that time were: impacts themselves, rise and fall of large plumes of ejected material, and atmospheric waves; also of interest were the characteristic morphologies of fresh sites. Based on timing from Galileo instruments and ground-based observations, the Hubble Space Telescope (HST) recorded actual impact phenomena for fragments G and W, with the A and E impacts occurring just prior to the HST observation window. For these four events, plumes w

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Dai, Liang, Alexander A. Kaurov, Keren Sharon, et al. "Asymmetric surface brightness structure of caustic crossing arc in SDSS J1226+2152: a case for dark matter substructure." Monthly Notices of the Royal Astronomical Society 495, no. 3 (2020): 3192–208. http://dx.doi.org/10.1093/mnras/staa1355.

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ABSTRACT We study the highly magnified arc SGAS J122651.3+215220 caused by a star-forming galaxy at zs = 2.93 crossing the lensing caustic cast by the galaxy cluster SDSS J1226+2152 (zl = 0.43), using Hubble Space Telescope observations. We report in the arc several asymmetric surface brightness features whose angular separations are a fraction of an arcsecond from the lensing critical curve and appear to be highly but unequally magnified image pairs of underlying compact sources, with one brightest pair having clear asymmetry consistently across four filters. One explanation of unequal magnif

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Winkler, P. Frank, and Wolfgang Hillebrandt. "Joint Discussion 9 Supernovae: one millennium after SN 1006." Proceedings of the International Astronomical Union 2, no. 14 (2006): 299–300. http://dx.doi.org/10.1017/s1743921307010691.

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The year 2006 marks the 1000th anniversary of the supernova of 1006 C.E., the brightest supernova in all of recorded human history. This is also a time of great excitement in the supernova community: Observations from space observatories including Hubble, Chandra, XMM-Newton, and Spitzer, together with ones from powerful new ground-based telescopes and instruments, are revealing supernova remnants in the Galaxy and beyond in unprecedented detail. Fully three-dimensional computational codes and simulations running on powerful new machines are providing insight into the physics of supernovae fre

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Häberle, Maximilian, Mattia Libralato, Andrea Bellini, et al. "Hunting for intermediate-mass black holes in globular clusters: an astrometric study of NGC 6441." Monthly Notices of the Royal Astronomical Society 503, no. 1 (2021): 1490–506. http://dx.doi.org/10.1093/mnras/stab474.

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ABSTRACT We present an astrometric study of the proper motions (PMs) in the core of the globular cluster NGC 6441. The core of this cluster has a high density and observations with current instrumentation are very challenging. We combine ground-based, high-angular-resolution NACO@VLT images with Hubble Space Telescope ACS/HRC data and measure PMs with a temporal baseline of 15 yr for about 1400 stars in the centremost 15 arcsec of the cluster. We reach a PM precision of ∼30 µas yr−1 for bright, well-measured stars. Our results for the velocity dispersion are in good agreement with other studie

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Spake, Jessica J., David K. Sing, Hannah R. Wakeford, et al. "Abundance measurements of H2O and carbon-bearing species in the atmosphere of WASP-127b confirm its supersolar metallicity." Monthly Notices of the Royal Astronomical Society 500, no. 3 (2020): 4042–64. http://dx.doi.org/10.1093/mnras/staa3116.

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ABSTRACT The chemical abundances of exoplanet atmospheres may provide valuable information about the bulk compositions, formation pathways, and evolutionary histories of planets. Exoplanets with large, relatively cloud-free atmospheres, and which orbit bright stars provide the best opportunities for accurate abundance measurements. For this reason, we measured the transmission spectrum of the bright (V ∼ 10.2), large (1.37 RJ), sub-Saturn mass (0.19 MJ) exoplanet WASP-127b across the near-UV to near-infrared wavelength range (0.3–5 μm), using the Hubble and Spitzer Space Telescopes. Our result

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Ripoche, Paul, Jeremy Heyl, Javiera Parada, and Harvey Richer. "Carbon stars as standard candles: I. The luminosity function of carbon stars in the Magellanic Clouds." Monthly Notices of the Royal Astronomical Society 495, no. 3 (2020): 2858–66. http://dx.doi.org/10.1093/mnras/staa1346.

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ABSTRACT Our goal in this paper is to derive a carbon-star luminosity function that will eventually be used to determine distances to galaxies at 50–60 Mpc and hence yield a value of the Hubble constant. Cool N-type carbon stars exhibit redder near-infrared colours than oxygen-rich stars. Using Two Micron All Sky Survey near-infrared photometry and the Gaia Data Release 2, we identify carbon stars in the Magellanic Clouds (MC) and the Milky Way (MW). Carbon stars in the MC appear as a distinct horizontal feature in the near-infrared ((J − Ks)0, MJ) colour–magnitude diagram. We build a colour s

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Wofford, Aida, Vanesa Ramírez, Janice C. Lee, et al. "Candidate LBV stars in galaxy NGC 7793 found via HST photometry + MUSE spectroscopy." Monthly Notices of the Royal Astronomical Society 493, no. 2 (2020): 2410–28. http://dx.doi.org/10.1093/mnras/staa290.

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ABSTRACT Only about 19 Galactic and 25 extragalactic bonafide luminous blue variables (LBVs) are known to date. This incomplete census prevents our understanding of this crucial phase of massive star evolution which leads to the formation of heavy binary black holes via the classical channel. With large samples of LBVs one could better determine the duration and maximum stellar luminosity which characterize this phase. We search for candidate LBVs (cLBVs) in a new galaxy, NGC 7793. For this purpose, we combine high spatial resolution images from two Hubble Space Telescope (HST) programs with o

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Roman, Nancy Grace. "Nancy Grace Roman and the Dawn of Space Astronomy." Annual Review of Astronomy and Astrophysics 57, no. 1 (2019): 1–34. http://dx.doi.org/10.1146/annurev-astro-091918-104446.

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Dear readers: We are sad to report that, soon after submitting her draft manuscript for this prefatory chapter, Nancy Grace Roman passed away on December 25, 2018. This final version of her memoir has been lightly edited but remains very true to the original. However, an Abstract was missing. Rather than trying to synthesize one in Nancy Grace's inimitable style, we take this opportunity to comment briefly on her life and its significance. Nancy Grace Roman was born in 1925 and came of age scientifically in the United States during the 1940s and 1950s. Together with the equally fascinating pre

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Modiano, David, Aastha S. Parikh, and Rudy Wijnands. "Near-ultraviolet detections of four dwarf nova candidates in the globular cluster 47 Tucanae." Astronomy & Astrophysics 634 (February 2020): A132. http://dx.doi.org/10.1051/0004-6361/201937043.

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We investigate near-ultraviolet variability in the Galactic globular cluster (GC) 47 Tucanae (47 Tuc). This work was undertaken within the GC sub-project of the Transient UV Objects project, a programme which aims to find and study transient and strongly variable UV sources. Globular clusters are ideal targets for transient searches because of their high stellar densities and large populations of variable systems. Using all 75 archival observations of 47 Tuc obtained with the UV/optical telescope (UVOT) aboard the Neil Gehrels Swift observatory with the uvm2 filter, we searched for UV variabil

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Duckss, Weitter. "Comoving Distance- Light Travel Distance (Treatise)." Budapest International Research in Exact Sciences (BirEx) Journal 2, no. 1 (2020): 1–12. http://dx.doi.org/10.33258/birex.v2i1.704.

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The discussion on the values of redshift, as well as blueshift, is based on a large increase in new evidence that in the whole volume of Universe there are gravitationally-bound objects (galaxies, clusters and super clusters of galaxies) „Using the Chandra and Hubble Space Telescopes we have now observed 72 collisions between galaxy clusters, including both ‘major’ and ‘minor’ mergers” (Harvey, 2015). That adds to a great diversity of galactic movement directions and their diverse appearances to an observer. The accent here is at the point of "clearing the early Universe" and asks questions ab

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SELTZER, RICHARD J. "HUBBLE SPACE TELESCOPE:." Chemical & Engineering News 68, no. 15 (1990): 4–5. http://dx.doi.org/10.1021/cen-v068n015.p004.

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West, Robert A. "Particles in Jupiter's atmosphere from the impacts of Comet P/Shoemaker-Levy 9." International Astronomical Union Colloquium 156 (May 1996): 269–92. http://dx.doi.org/10.1017/s0252921100115544.

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The dark clouds that were easily seen in small telescopes after the comet impacts were caused by small particles which were deposited in Jupiter's stratosphere. Observations from the Hubble Space Telescope and from ground-based instruments at visible and infrared wavelengths indicate that the mean radius of the particles is in the range 0.1 to 0.3 μm, and the total volume of particles is approximately the same as that for a 1-km diameter sphere. In the dark core regions of freshly-formed impacts, the particles are distributed over a large vertical extent, between about 1 mb and 200 mb or deepe

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Strazzullo, V., M. Pannella, J. J. Mohr, et al. "Galaxy populations in the most distant SPT-SZ clusters." Astronomy & Astrophysics 622 (February 2019): A117. http://dx.doi.org/10.1051/0004-6361/201833944.

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We present the first results from a galaxy population study in the highest redshift galaxy clusters identified in the 2500 deg2 South Pole Telescope Sunyaev Zel’dovich effect (SPT-SZ) survey, which is sensitive to M500 ≳ 3 × 1014 M⊙ clusters from z ∼ 0.2 out to the highest redshifts where such massive structures exist. The cluster selection is to first order independent of galaxy properties, making the SPT-SZ sample particularly well suited for cluster galaxy population studies. We carried out a four-band imaging campaign with the Hubble and Spitzer Space Telescopes of the five z ≳ 1.4, S/NSZE

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Whitmore, Bradley C., Helmut Jenkner, Warren Miller, and Anton M. Koekemoer. "Prototype development for a Hubble Legacy Archive." Proceedings of the International Astronomical Union 2, no. 14 (2006): 589. http://dx.doi.org/10.1017/s174392130701188x.

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The Space Telescope Science Institute (STScI), in collaboration with the European Coordinating Facility (ECF), and the Canadian Astronomy Data Centre (CADC), is studying the development of an enhanced archive for the Hubble Space TelescopeHST), with the goal of improving the scientific value of the data. The primary enhancements would be:

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Newman, Alan R. "The Hubble Space Telescope." Analytical Chemistry 62, no. 14 (1990): 787A—793A. http://dx.doi.org/10.1021/ac00213a725.

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Boggess, Albert. "The Hubble Space Telescope." International Astronomical Union Colloquium 123 (1990): 3–7. http://dx.doi.org/10.1017/s025292110007682x.

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AbstractThe Hubble Space Telescope was launched from the Kennedy Space Center on April 24, 1990. Its initial check-out indicates that all sub-systems of the satellite are working very well, with two key exceptions: The line-of-sight pointing is subject to occasional jitter apparently induced by thermal stresses in the solar arrays; this is expected to be overcome. The telescope mirrors are found to contain approximately 0.5 wave rms of spherical aberration which cannot be overcome by any controls on board the satellite. This defect will limit the scientific performance of the telescope in the

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Meylan, G. "The Hubble Space Telescope." Europhysics News 22, no. 11 (1991): 206–9. http://dx.doi.org/10.1051/epn/19912211206.

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BAHCALL, NETA A. "The Hubble Space Telescope." Annals of the New York Academy of Sciences 470, no. 1 Twelfth Texas (1986): 331–37. http://dx.doi.org/10.1111/j.1749-6632.1986.tb47983.x.

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Smith, Francis Graham. "The hubble space telescope." Contemporary Physics 31, no. 4 (1990): 271–72. http://dx.doi.org/10.1080/00107519008222022.

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Anonymous. "Hubble Space Telescope arrives." Eos, Transactions American Geophysical Union 70, no. 42 (1989): 906. http://dx.doi.org/10.1029/89eo00323.

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