Relevant bibliographies by topics / Nuffield Radio Astronomy Laboratories

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  2. Dissertations / Theses
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Academic literature on the topic 'Nuffield Radio Astronomy Laboratories'

Author: Grafiati
Published: 4 June 2021
Last updated: 4 February 2022

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Journal articles on the topic "Nuffield Radio Astronomy Laboratories"

1

Keane, E. F. "Radio pulsar variability." Proceedings of the International Astronomical Union 8, S291 (August 2012): 295–300. http://dx.doi.org/10.1017/s1743921312023927.

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AbstractPulsars are potentially the most remarkable physical laboratories we will ever use. Although in many senses they are extremely clean systems there are a large number of instabilities and variabilities seen in the emission and rotation of pulsars. These need to be recognised in order to both fully understand the nature of pulsars, and to enable their use as precision tools for astrophysical investigations. Here I describe these effects, discuss the wide range of timescales involved, and consider the implications for precision pulsar timing.
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Chatterjee, Shami. "Science with radio pulsar astrometry." Proceedings of the International Astronomical Union 8, S291 (August 2012): 269. http://dx.doi.org/10.1017/s1743921312023824.

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AbstractHigh precision astrometry on radio pulsars can provide model-independent estimates of their distances and velocities. Such estimates serve to calibrate models of the Galactic electron density distribution, thereby improving distance estimates for the entire pulsar population. They can provide independent astrometric information for precision pulse timing, reducing the number of fit parameters and thus potentially improving the sensitivity of pulsar timing arrays to the gravitational wave background. Individual neutron stars also serve as laboratories for astrophysics. For example, distances to highly luminous recycled pulsars identified by the Fermi gamma ray space telescope will constrain their energetics and may serve to probe the equation of state for nuclear matter at extremes of density and pressure. Here we provide an update on ongoing astrometry programs with the Very Long Baseline Array and the scientific results from these efforts.
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MUNNS, DAVID. "If we build it, who will come? Radio astronomy and the limitations of ““national”” laboratories in Cold War America." Historical Studies in the Physical and Biological Sciences 34, no. 1 (2003): 95–113. http://dx.doi.org/10.1525/hsps.2003.34.1.95.

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ABSTRACT: The history of big science, especially physics, informs historians that the instrument is at the heart of Cold War science. This article presents the National Radio Astronomy Observatory (NRAO), which was consciously modeled on the Brookhaven National Laboratory and where the choice of instrument was of only secondary importance. During the planning for the NRAO, which took place from 1954 until 1956, mostly in offices in Washington, D.C. and New York, an extended debate emerged over the place of ““national”” facilities in science, and their relationship to established university programs, particularly those concerned with graduate student instruction. The case of the NRAO reveals the resilience of notions of dispersed scientific community, emphasizing smaller programs in many universities, as well as the perceived necessity of continued participation from a wide disciplinary array of practitioners who, cooperatively, forged radio astronomy. This essay illustrates substantial resistance to the model of scientific practice advocated by the national laboratories when applied to radio astronomy. Critics of a national facility for radio astronomy charged that the substantial funds could be better utilized within existing university-based programs, which would need to be expanded in any event to provide the researchers for the national facility. The senior researchers in radio astronomy were not American, highlighting the fallacy of the notion of national science.
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Langston, Glen. "NRAO 43-m telescope operation at 170-1700 MHz: a Bi-Static Radar Collaboration." Proceedings of the International Astronomical Union 2, no. 14 (August 2006): 367. http://dx.doi.org/10.1017/s1743921307011015.

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AbstractThe NRAO 43m telescope has been refurbished and begun regular observations in the frequency range 170 - 1700 MHz. The 43 m operations support a Bi-Static Radar Collaboration to measure the Earth's ionospheric turbulence. Researchers from Chalmers University of Technology in Sweden have designed and built a unique design wide-band feed, 150 - 1700 MHz. Lincoln Laboratories/MIT has packaged the feed with room temperature low noise amplifiers. Lincoln Laboratories has installed a high-dynamic range RF system together with a wide-band sampler system. The NRAO operates the 43 m telescope according to schedules authored by Lincoln Laboratories. Currently the 43 m telescope is tracking spacecraft 48 hr a week. The tracking antenna operation is completely automated. A group at MIT/Haystack have installed a second radar experiment at the 43 m as well as an array of 6 ‘discone’ antennas. Their experiment is testing the use of reflected FM radio stations as probes of the ionosphere.
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Enßlin, T. A., T. Clarke, C. Vogt, A. Waelkens, and A. A. Schekochihin. "Magnetic turbulence in clusters of galaxies." Proceedings of the International Astronomical Union 5, H15 (November 2009): 456–58. http://dx.doi.org/10.1017/s1743921310010264.

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AbstractGalaxy clusters are large laboratories for magnetic plasma turbulence and therefore permit us to confront our theoretical concepts of magnetogenesis with detailed observations. Magnetic turbulence in clusters can be studied via the radio-synchrotron emission from the intra-cluster medium in the form of cluster radio relics and halos. The power spectrum of turbulent magnetic fields can be examined via Faraday rotation analysis of extended radio sources. In case of the Hydra A cool core, the observed magnetic spectrum can be understood in terms of a turbulence-mediated feedback loop between gas cooling and the jet activity of the central galaxy. Finally, methods to measure higher-order statistics of the magnetic field using Stokes-parameter correlations are discussed, which permit us to determine the power spectrum of the magnetic tension force. This fourth-order statistical quantity offers a way to discriminate between different magnetic turbulence scenarios and different field structures using radio polarimetric observations.
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Igoshev, Andrei P., Sergei B. Popov, and Rainer Hollerbach. "Evolution of Neutron Star Magnetic Fields." Universe 7, no. 9 (September 20, 2021): 351. http://dx.doi.org/10.3390/universe7090351.

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Neutron stars are natural physical laboratories allowing us to study a plethora of phenomena in extreme conditions. In particular, these compact objects can have very strong magnetic fields with non-trivial origin and evolution. In many respects, its magnetic field determines the appearance of a neutron star. Thus, understanding the field properties is important for the interpretation of observational data. Complementing this, observations of diverse kinds of neutron stars enable us to probe parameters of electro-dynamical processes at scales unavailable in terrestrial laboratories. In this review, we first briefly describe theoretical models of the formation and evolution of the magnetic field of neutron stars, paying special attention to field decay processes. Then, we present important observational results related to the field properties of different types of compact objects: magnetars, cooling neutron stars, radio pulsars, and sources in binary systems. After that, we discuss which observations can shed light on the obscure characteristics of neutron star magnetic fields and their behaviour. We end the review with a subjective list of open problems.
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Song, Yiqing, Sean T. Linden, Aaron S. Evans, Loreto Barcos-Muñoz, and Eric J. Murphy. "Characterizing circumnuclear starbursts in the local universe with the VLA." Proceedings of the International Astronomical Union 15, S359 (March 2020): 462–63. http://dx.doi.org/10.1017/s1743921320002367.

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AbstractNuclear rings are excellent laboratories to study star formation (SF) under extreme conditions. We compiled a sample of 9 galaxies that exhibit bright nuclear rings at 3-33 GHz radio continuum observed with the Jansky Very Large Array, of which 5 are normal star-forming galaxies and 4 are Luminous Infrared Galaxies (LIRGs). Using high frequency radio continuum as an extinction-free tracer of SF, we estimated the size and star formation rate of each nuclear ring and a total of 37 individual circumnuclear star-forming regions. Our results show that majority of the SF in the sample LIRGs take place in their nuclear rings, and circumnuclear SF in local LIRGs are much more spatially concentrated compared to those in the local normal galaxies and previously studied nuclear and extra-nuclear SF in normal galaxies at both low and high redshifts.
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Hwang, Ji-Gwang, Michael Abo-Bakr, Aleksandr Matveenko, Georgios Kourkafas, and Thorsten Kamps. "Radiation Generation with an Existing Demonstrator of an Energy-Recovery Continuous-Wave Superconducting RF Accelerator." Journal of the Korean Physical Society 77, no. 5 (September 2020): 337–43. http://dx.doi.org/10.3938/jkps.77.337.

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Abstract Over the past decades, many accelerator laboratories have put much effort into the development of compact energy-recovery linac (ERL) demonstrators to verify various physical and technical aspects of the generation, acceleration, transport and energy recovery of high brightness and high average current electron beams in a superconducting radio-frequency (SRF) linear accelerator. Beyond these goals, the ERL demonstrator also offers unique opportunities to study novel schemes for THz and X-ray radiation generation. In this paper, we discuss feasible options for schemes generating THz and X-ray radiation at low-energy continuous-wave (CW) SRF ERL demonstrators such as the bERLinPro accelerator.
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Siemieniec–Ozieblo, Grazyna, and Mariia Bilinska. "Acceleration of cosmic rays by double shock waves in galaxy clusters: application to radio relics." Astronomy & Astrophysics 647 (March 2021): A94. http://dx.doi.org/10.1051/0004-6361/202038276.

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Context. Radio relics in galaxy clusters are known to be good laboratories for verification of the applicability of the diffusive shock acceleration (DSA) model in its canonical version. The need for such verification stems from the inconsistencies in the shock properties resulting from radio observations compared to X-ray observations. Aims. In this article we aim to explore how the presence of a second shock in the vicinity of a relic modifies the spectrum of accelerated electrons and decipher which of the involved parameters can have a significant impact on their shape. Methods. We analytically studied DSA of cosmic rays in two stationary shocks aiming to investigate the change of the distribution function. The latter eventually leads to spectrum slope deviations visible in different observations and simulations that do not appear to be explained by the case wherein cosmic rays interact with a single shock wave. Results. We obtain a complex distribution function f(x, p) depending on many parameters (distance between two shocks, compression ratios, spatial diffusion coefficients, injection value, etc.). This function reveals modifications that occur because of the coupled acceleration in both shocks. Apparently, deviations in the particle spectrum from the pure power law depend on a few parameters such as Q1/Q2, κ1/κ2, r1/r2, and L. Although we do not verify this idea by taking a particular cluster as an example, we demonstrate a potential cause of spectral disturbances in radio relics. In general terms, our findings appear to correlate with results from the literature when the distance between the shocks is of the order of the width of a radio relic and κ1/κ2 ∝ 3.
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Ng, Cherry. "Conducting the deepest all-sky pulsar survey ever: the all-sky High Time Resolution Universe survey." Proceedings of the International Astronomical Union 8, S291 (August 2012): 53–56. http://dx.doi.org/10.1017/s1743921312023137.

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AbstractThe extreme conditions found in and around pulsars make them fantastic natural laboratories, providing insights to a rich variety of fundamental physics and astronomy. To discover more pulsars we have begun the High Time Resolution Universe (HTRU) survey: a blind survey of the northern sky with the 100-m Effelsberg radio telescope in Germany and a twin survey of the southern sky with the 64-m Parkes radio telescope in Australia. The HTRU is an international collaboration with expertise shared among the MPIfR in Germany, ATNF/CASS and Swinburne University of Technology in Australia, University of Manchester in the UK and INAF in Italy. The HTRU survey uses multi-beam receivers and backends constructed with recent advancements in technology, providing unprecedentedly high time and frequency resolution, allowing us to probe deeper into the Galaxy than ever before. While a general overview of HTRU has been given by Keith at this conference, here we focus on three further aspects of HTRU discoveries and highlights. These include the ‘Diamond-planet pulsar’ binary J1719-1438 and a second similar system recently discovered. In addition, we provide specifications of the HTRU-North survey and an update of its status. In the last section we give an overview of the search for highly-accelerated binaries in the Galactic plane region. We discuss the computational challenges arising from the processing of the petabyte-sized HTRU survey data. We present an innovative segmented search technique which aims to increase our chances of discovering highly accelerated relativistic binary systems, potentially including pulsar-black-hole binaries.
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Dissertations / Theses on the topic "Nuffield Radio Astronomy Laboratories"

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"Dwarf Galaxies as Laboratories of Protogalaxy Physics: Canonical Star Formation Laws at Low Metallicity." Doctoral diss., 2019. http://hdl.handle.net/2286/R.I.55009.

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abstract: In the upcoming decade, powerful new astronomical facilities such as the James Webb Space Telescope (JWST), the Square Kilometer Array (SKA), and ground-based 30-meter telescopes will open up the epoch of reionization to direct astronomical observation. One of the primary tools used to understand the bulk astrophysical properties of the high-redshift universe are empirically-derived star-forming laws, which relate observed luminosity to fundamental astrophysical quantities such as star formation rate. The radio/infrared relation is one of the more mysterious of these relations: despite its somewhat uncertain astrophysical origins, this relation is extremely tight and linear, with 0.3 dex of scatter over five orders of magnitude in galaxy luminosity. The effects of primordial metallicities on canonical star-forming laws is an open question: a growing body of evidence suggests that the current empirical star forming laws may not be valid in the unenriched, metal-poor environment of the very early universe. In the modern universe, nearby dwarf galaxies with less than 1/10th the Solar metal abundance provide an opportunity to recalibrate our star formation laws and study the astrophysics of extremely metal-deficient (XMD) environments in detail. I assemble a sample of nearby dwarf galaxies, all within 100 megaparsecs, with nebular oxygen abundances between 1/5th and 1/50th Solar. I identify the subsample of these galaxies with space-based mid- and far-infrared data, and investigate the effects of extreme metallicities on the infrared-radio relationship. For ten of these galaxies, I have acquired 40 hours of observations with the Jansky Very Large Array (JVLA). C-band (4-8 GHz) radio continuum emission is detected from all 10 of these galaxies. These represent the first radio continuum detections from seven galaxies in this sample: Leo A, UGC 4704, HS 0822+3542, SBS 0940+544, and SBS 1129+476. The radio continuum in these galaxies is strongly associated with the presence of optical H-alpha emission, with spectral slopes suggesting a mix of thermal and non-thermal sources. I use the ratio of the radio and far-infrared emission to investigate behavior of the C-band (4-8 GHz) radio/infrared relation at metallicities below 1/10th Solar. I compare the low metallicity sample with the 4.8 GHz radio/infrared relationship from the KINGFISHER nearby galaxy sample Tabatabaei et al. 2017 and to the 1.4 GHz radio/infrared relationship from the blue compact dwarf galaxy sample of Wu et al. 2008. The infrared/radio ratio q of the low metallicity galaxies is below the average q of star forming galaxies in the modern universe. I compare these galaxies' infrared and radio luminosities to their corresponding Halpha luminosities, and find that both the infrared/Halpha and the radio/H-alpha ratios are reduced by nearly 1 dex in the low metallicity sample vs. higher metallicity galaxies; however the deficit is not straightforwardly interpreted as a metallicity effect.
Dissertation/Thesis
Doctoral Dissertation Astrophysics 2019
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Books on the topic "Nuffield Radio Astronomy Laboratories"

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Nuffield Radio Astronomy Laboratories' Conference (1992 Manchester, England). Sub-arcsecond radio astronomy: Proceedings of the Nuffield Radio Astronomy Laboratories' Conference, held in Manchester, July 20-24, 1992. Cambridge: Cambridge University Press, 1993.

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2

1913-, Lovell Bernard Sir, ed. Voice of the universe: Building the Jodrell Bank telescope. New York: Praeger, 1987.

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3

The Jodrell Bank telescopes. Oxford [Oxfordshire]: Oxford University Press, 1985.

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Science and spectacle: The work of Jodrell Bank in post-war British culture. Amsterdam: Harwood Academic, 1998.

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Relativistic jets from galactic sources: Papers presented at a workshop at the Nuffield Radio Astronomy Labs of the University of Manchester, Jodrell Bank, Cheshire on 17th-18th April 1996. [S.l.]: [s.n.], 1996.

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Book chapters on the topic "Nuffield Radio Astronomy Laboratories"

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Halfen, DeWayne T., Aldo J. Apponi, and Lucy M. Ziurys. "Development of Laboratories for Teaching Chemical Principles Using Radio Astronomy." In ACS Symposium Series, 363–77. Washington, DC: American Chemical Society, 2008. http://dx.doi.org/10.1021/bk-2008-0981.ch021.

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