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Relevant bibliographies by topics / Molecular clouds

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Academic literature on the topic 'Molecular clouds'

Author: Grafiati

Published: 4 June 2021

Last updated: 26 October 2024

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Journal articles on the topic "Molecular clouds"

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Sullivan, Colin H., L. M. Fissel, P. K. King, C.-Y. Chen, Z.-Y. Li, and J. D. Soler. "Characterizing the magnetic fields of nearby molecular clouds using submillimeter polarization observations." Monthly Notices of the Royal Astronomical Society 503, no. 4 (March 16, 2021): 5006–24. http://dx.doi.org/10.1093/mnras/stab596.

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ABSTRACT Of all the factors that influence star formation, magnetic fields are perhaps the least well understood. The goal of this paper is to characterize the 3D magnetic field properties of nearby molecular clouds through various methods of statistically analysing maps of polarized dust emission. Our study focuses on nine clouds, with data taken from the Planck Sky Survey as well as data from the Balloon-borne Large Aperture Submillimeter Telescope for Polarimetry observations of Vela C. We compare the distributions of polarization fraction (p), dispersion in polarization angles ($\mathcal {

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Clube, S. V. M. "Molecular clouds: comet factories?" International Astronomical Union Colloquium 83 (1985): 19–30. http://dx.doi.org/10.1017/s0252921100083779.

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AbstractRecent discoveries seem to indicate a catastrophic history of terrestrial evolution, explicable in terms of Oort cloud disturbance by molecular clouds in the Galactic disc. The problem of Oort cloud replenishment thus assumes considerable significance and reasons are given for supposing comet exchange takes place during actual penetration of molecular clouds. The number density of comets in molecular clouds, thereby implied, seems to suggest primary condensations of ≤103km in a dense precursor state of spiral arms. If chemical and/or isotopic signatures of comets should indicate an ext

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Bot, Caroline, Mónica Rubio, François Boulanger, Marcus Albrecht, Frank Bertoldi, Alberto D. Bolatto, and Adam K. Leroy. "Tracing the cold molecular gas reservoir through dust emission in the SMC." Proceedings of the International Astronomical Union 4, S256 (July 2008): 148–53. http://dx.doi.org/10.1017/s174392130802838x.

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AbstractThe amount of molecular gas is a key for understanding the future star formation in a galaxy. However, this quantity is difficult to infer as the cold H2 is almost impossible to observe and, especially at low metallicities, CO only traces part of the clouds, keeping large envelopes of H2 hidden from observations. In this context, millimeter dust emission tracing the cold and dense regions can be used as a tracer to unveil the total molecular gas masses. I present studies of a sample of giant molecular clouds in the Small Magellanic Cloud. These clouds have been observed in the millimet

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Blitz, Leo. "Molecular Clouds at High z." Symposium - International Astronomical Union 144 (1991): 41–51. http://dx.doi.org/10.1017/s0074180900088896.

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The evidence for the existence of molecular clouds at large distances from the Galactic plane is reviewed. The molecular clouds at high Galactic latitudes are shown to be largely confined to the Galactic plane. There is evidence for one giant molecular cloud as much as four scale heights from the Galactic plane, but given the sample size from which the cloud is drawn, it is reasonable to suppose that it is part of the tail of the thin disk population. There is weak evidence that one star-forming molecular cloud may have originated in the Galactic halo. On the basis of kinematic evidence howeve

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Wong, Tony, Annie Hughes, Jürgen Ott, Jorge L. Pineda, and Erik Muller. "The Molecular Cloud Population of the Large Magellanic Cloud." Proceedings of the International Astronomical Union 8, S292 (August 2012): 71–74. http://dx.doi.org/10.1017/s1743921313000495.

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AbstractWe have mapped an extensive sample of molecular clouds in the Large Magellanic Cloud (LMC) at 11 pc resolution in the CO(1-0) line as part of the Magellanic Mopra Assessment (MAGMA). We identify clouds as regions of connected CO emission and determine their sizes, line widths, and fluxes. We find that GMCs are not preferentially located in regions of high Hi line width or velocity gradient, and that there is no clear Hi column density threshold for CO detection. The luminosity function of CO clouds is steeper than dN/dL ∝ L−2, suggesting a substantial fraction of mass in low-mass cloud

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Körtgen, Bastian. "The turbulence driving parameter of molecular clouds in disc galaxies." Monthly Notices of the Royal Astronomical Society 497, no. 1 (July 24, 2020): 1263–74. http://dx.doi.org/10.1093/mnras/staa2028.

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ABSTRACT Supersonic turbulence plays a pivotal role during the formation of molecular clouds and stars in galaxies. However, little is known about how the fraction of compressive and solenoidal modes in the velocity field evolves over time and how it depends on properties of the molecular cloud or the galactic environment. In this work, we carry out magnetohydrodynamical simulations of disc galaxies and study the time evolution of the turbulence driving parameter for an ensemble of clouds. We find that the time-averaged turbulence driving parameter is insensitive to the position of the cloud w

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Li, Pak Shing, and Richard I. Klein. "Magnetized interstellar molecular clouds – II. The large-scale structure and dynamics of filamentary molecular clouds." Monthly Notices of the Royal Astronomical Society 485, no. 4 (March 27, 2019): 4509–28. http://dx.doi.org/10.1093/mnras/stz653.

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Abstract We perform ideal magnetohydrodynamics high-resolution adaptive mesh refinement simulations with driven turbulence and self-gravity and find that long filamentary molecular clouds are formed at the converging locations of large-scale turbulence flows and the filaments are bounded by gravity. The magnetic field helps shape and reinforce the long filamentary structures. The main filamentary cloud has a length of ∼4.4 pc. Instead of a monolithic cylindrical structure, the main cloud is shown to be a collection of fibre/web-like substructures similar to filamentary clouds such as L1495. Un

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Braine, J., E. Rosolowsky, P. Gratier, E. Corbelli, and K. F. Schuster. "Properties and rotation of molecular clouds in M 33." Astronomy & Astrophysics 612 (April 2018): A51. http://dx.doi.org/10.1051/0004-6361/201732405.

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The sample of 566 molecular clouds identified in the CO(2–1) IRAM survey covering the disk of M 33 is explored in detail. The clouds were found using CPROPS and were subsequently catalogued in terms of their star-forming properties as non-star-forming (A), with embedded star formation (B), or with exposed star formation (C, e.g., presence of Hα emission). We find that the size-linewidth relation among the M 33 clouds is quite weak but, when comparing with clouds in other nearby galaxies, the linewidth scales with average metallicity. The linewidth and particularly the line brightness decrease

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Yan, Qing-Zeng, Ji Yang, Yang Su, Yan Sun, Xin Zhou, Ye Xu, Hongchi Wang, Shaobo Zhang, and Zhiwei Chen. "Dependence of Molecular Cloud Samples on Angular Resolution, Sensitivity, and Algorithms." Astronomical Journal 164, no. 2 (July 18, 2022): 55. http://dx.doi.org/10.3847/1538-3881/ac77ea.

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Abstract In this work, we investigate the observational and algorithmic effects on molecular cloud samples identified from position–position–velocity (PPV) space. By smoothing and cutting off the high quality data of the Milky Way Imaging Scroll Painting (MWISP) survey, we extract various molecular cloud samples from those altered data with the DBSCAN (density-based spatial clustering of applications with noise) algorithm. Those molecular cloud samples are subsequently used to gauge the significance of sensitivity, angular/velocity resolution, and DBSCAN parameters. Two additional surveys, the

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Duarte-Cabral, A., D. Colombo, J. S. Urquhart, A. Ginsburg, D. Russeil, F. Schuller, L. D. Anderson, et al. "The SEDIGISM survey: molecular clouds in the inner Galaxy." Monthly Notices of the Royal Astronomical Society 500, no. 3 (September 11, 2020): 3027–49. http://dx.doi.org/10.1093/mnras/staa2480.

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ABSTRACT We use the 13CO (2–1) emission from the SEDIGISM (Structure, Excitation, and Dynamics of the Inner Galactic InterStellar Medium) high-resolution spectral-line survey of the inner Galaxy, to extract the molecular cloud population with a large dynamic range in spatial scales, using the Spectral Clustering for Interstellar Molecular Emission Segmentation (scimes) algorithm. This work compiles a cloud catalogue with a total of 10 663 molecular clouds, 10 300 of which we were able to assign distances and compute physical properties. We study some of the global properties of clouds using a

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Dissertations / Theses on the topic "Molecular clouds"

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Beletsky, Yuri. "Extragalactic molecular clouds and chemistry of diffuse interstellar clouds." Diss., lmu, 2009. http://nbn-resolving.de/urn:nbn:de:bvb:19-105670.

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Vichetti, Rafael Mário [UNESP]. "Síntese dos isótopos do monóxido de carbono no meio interestelar." Universidade Estadual Paulista (UNESP), 2009. http://hdl.handle.net/11449/91889.

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Made available in DSpace on 2014-06-11T19:25:31Z (GMT). No. of bitstreams: 0 Previous issue date: 2009-12-21Bitstream added on 2014-06-13T19:53:20Z : No. of bitstreams: 1 vichietti_rm_me_rcla.pdf: 842604 bytes, checksum: 731ca276a75c1b92840e57bd7497b5e1 (MD5)<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)<br>De acordo com os resultados observacionais de condensações de nuvens moleculares escuras, grandes variações na razão 13CO/C18O são observadas quando se comparam os resultados obtidos nas condensações situadas dentro da mesma nuvem, bem como de nuvem para nuvem. O

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Brown, Ian David. "The velocity of molecular clouds." Thesis, University of Cambridge, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.293612.

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Bretherton, Derek. "Star formation in molecular clouds." Thesis, Liverpool John Moores University, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.402927.

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Rowles, Jonathan Henry. "The structure of molecular clouds." Thesis, University of Kent, 2011. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.544095.

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Richardson, Kevin John. "Submillimetre molecular line observations and modelling of molecular clouds." Thesis, Queen Mary, University of London, 1985. http://qmro.qmul.ac.uk/xmlui/handle/123456789/1705.

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Submillimetre molecular line observations of molecular clouds in our galaxy are presented, and the data analysed using various alternative cloud models. A critical review is given of the methods commonly used to interpret molecular line data, including both theoretical considerations and issues relating to calibration and comparability of results obtained with different telescopes. A detailed comparison is made between results predicted from large velocity gradient (LVG) models, including the generalisation to non-monotonic velocity flows, and those given by "microturbulent" clouds. An LVG mod

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McElroy, Daniel. "Grain surface chemistry in molecular clouds." Thesis, Queen's University Belfast, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.602462.

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This work ia a study of chemistry in molecular clouds. I begin by describing the improvements made to gas phase chemical reaction data in the recent release of the UMIST database for astrochemistry (Rate 12). Improvements to the reaction network include the addition of anions, new reaction rate coefficient and branching rate measurements across all reactions types and newly calculated photodissociation and photoionisation rates.

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Morisawa, Yusuke. "Spectroscopic study of some chemically significant molecules in molecular clouds." 京都大学 (Kyoto University), 2005. http://hdl.handle.net/2433/144599.

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García, Fuentes Pablo Fernando. "Giant Molecular Clouds in the Southern Milky Way." Tesis, Universidad de Chile, 2007. http://www.repositorio.uchile.cl/handle/2250/104575.

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Dobbs, Clare Louise. "The formation of molecular clouds in spiral galaxies /." St Andrews, 2007. http://hdl.handle.net/10023/214.

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Books on the topic "Molecular clouds"

1

Serra, Guy, ed. Nearby Molecular Clouds. Berlin, Heidelberg: Springer Berlin Heidelberg, 1985. http://dx.doi.org/10.1007/3-540-15991-6.

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Herrmann, Franz. Atomic oxygen in molecular clouds. Garching bei München: Max-Planck-Institut für extraterrestrische Physik, 1993.

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3

A, James R., Millar T. J, and University of Manchester. Astronomy Dept., eds. Molecular clouds: The proceedings of a conference at the Department ofAstronomy, University of Manchester, 26-30 March 1990. Cambridge (England): Cambridge Univerversity Press, 1991.

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4

N, Mead Kathryn, University of Texas at Austin. Dept. of Astronomy, McDonald Observatory, and United States. National Aeronautics and Space Administration, eds. Molecular clouds in the outer galaxy. Austin, Tex: University of Texas at Austin, Dept. of Astronomy and McDonald Observatory, 1986.

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5

United States. National Aeronautics and Space Administration. Scientific and Technical Information Branch., ed. Molecular clouds in Orion and Monoceros. [Washington, DC]: National Aeronautics and Space Administration, Scientific and Technical Information Branch, 1986.

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United States. National Aeronautics and Space Administration. Scientific and Technical Information Branch., ed. Molecular clouds in the Carina arm. [Washington, DC]: National Aeronautics and Space Administration, Scientific and Technical Information Branch, 1986.

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United States. National Aeronautics and Space Administration., ed. [Theory of grain alignment in molecular clouds]: [annual status report, 1 May 1992 - 28 Feb. 1993]. [Washington, DC: National Aeronautics and Space Administration, 1993.

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United States. National Aeronautics and Space Administration., ed. Theoretical studies in interstellar cloud chemistry: Final report. [Washington, DC: National Aeronautics and Space Administration, 1993.

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United States. National Aeronautics and Space Administration., ed. [Theory of grain alignment in molecular clouds]: [annual status report, 1 May 1992 - 28 Feb. 1993]. [Washington, DC: National Aeronautics and Space Administration, 1993.

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Handa, T. Thermal SiO and H13CO+ line observations of the dense molecular cloud G0.11-0.11 in the galactic center region. Nobeyama, Minamisaku, Nagano-ken, Japan: Nobeyama Radio Observatory of the National Astronomical Observatory, 2005.

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Book chapters on the topic "Molecular clouds"

1

Blitz, Leo, and Jonathan P. Williams. "Molecular Clouds." In The Origin of Stars and Planetary Systems, 3–28. Dordrecht: Springer Netherlands, 1999. http://dx.doi.org/10.1007/978-94-011-4509-1_1.

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Carraro, Giovanni. "Molecular Clouds." In UNITEXT for Physics, 319–40. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-75293-4_15.

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Jaffe, D. T. "Warm Molecular Clouds." In Astrochemistry of Cosmic Phenomena, 311–15. Dordrecht: Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-011-2761-5_68.

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Reitner, Joachim. "Cosmic Molecular Clouds." In Encyclopedia of Geobiology, 292–93. Dordrecht: Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-1-4020-9212-1_243.

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Wilson, T. L., R. A. Gaume, K. J. Johnston, and J. Schmid-Burgk. "Galactic Molecular Clouds." In ESO Astrophysics Symposia, 177–84. Berlin, Heidelberg: Springer Berlin Heidelberg, 1996. http://dx.doi.org/10.1007/978-3-540-69999-6_25.

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Lebrun, F. "A synthetic view at large scale of local molecular clouds." In Nearby Molecular Clouds, 3–14. Berlin, Heidelberg: Springer Berlin Heidelberg, 1985. http://dx.doi.org/10.1007/3-540-15991-6_67.

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de Vries, C. P. "Comparison of optical appearance and infrared emission of extended dust clouds." In Nearby Molecular Clouds, 20–24. Berlin, Heidelberg: Springer Berlin Heidelberg, 1985. http://dx.doi.org/10.1007/3-540-15991-6_69.

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Boulanger, F., B. Baud, and G. D. van Albada. "Correlation of high galactic latitude HI and FIR emission and warm dust in the neutral interstellar medium." In Nearby Molecular Clouds, 28–32. Berlin, Heidelberg: Springer Berlin Heidelberg, 1985. http://dx.doi.org/10.1007/3-540-15991-6_71.

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Ungerer, V., N. Mauron, J. Brillet, and Nguyen-Quang-Rieu. "C18—O and optical observations of the Taurus cloud in front of 3C 111." In Nearby Molecular Clouds, 68–71. Berlin, Heidelberg: Springer Berlin Heidelberg, 1985. http://dx.doi.org/10.1007/3-540-15991-6_77.

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Beichman, C. A., J. P. Emerson, R. E. Jennings, S. Harris, B. Baud, and E. T. Young. "IRAS observations of star formation in nearby molecular clouds." In Nearby Molecular Clouds, 95–103. Berlin, Heidelberg: Springer Berlin Heidelberg, 1985. http://dx.doi.org/10.1007/3-540-15991-6_83.

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Conference papers on the topic "Molecular clouds"

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Hamden, Erika T., David Schiminovich, Neal Turner, Blakesley Burkhart, Tom Haworth, Nicole Arulanantham, Haeun Chung, et al. "Eos: a FUV spectroscopic mission to observe molecular hydrogen in molecular clouds." In Space Telescopes and Instrumentation 2024: Ultraviolet to Gamma Ray, edited by Jan-Willem A. den Herder, Kazuhiro Nakazawa, and Shouleh Nikzad, 11. SPIE, 2024. http://dx.doi.org/10.1117/12.3017644.

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Puy, Denis, and Monique Signore. "Primordial molecular clouds." In 3 K COSMOLOGY. ASCE, 1999. http://dx.doi.org/10.1063/1.59317.

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Phillips, Thomas G. "Millimeter and submillimeter wave astronomy." In OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1986. http://dx.doi.org/10.1364/oam.1986.mh3.

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The interstellar medium consists of diffuse clouds and dense clouds containing atoms, molecules, and dust particles at temperatures ranging from 3 to several hundred kelvins. The dense cloud gas particles are mostly molecular and the species found vary from simple molecules such as H2, CO, CS, HCN, etc. to heavy types such as the cyanopolyynes. Molecules other than symmetric ones, such as H2, have dipole moments and can be observed through their rotational transitions which lie in the millimeter and submillimeter bands. The emission line strengths as seen by large ground radio telescopes are u

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Rice, Johnathan, and Steven Federman. "THE TRANSITION FROM DIFFUSE ATOMIC CLOUDS TO DENSE MOLECULAR CLOUDS." In 73rd International Symposium on Molecular Spectroscopy. Urbana, Illinois: University of Illinois at Urbana-Champaign, 2018. http://dx.doi.org/10.15278/isms.2018.rl08.

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Turner, B. E. "The nature of molecular clouds." In ASTROPHYSICAL IMPLICATIONS OF THE LABORATORY STUDY OF PRESOLAR MATERIALS. ASCE, 1997. http://dx.doi.org/10.1063/1.53334.

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Gredel, Roland. "Molecular abundances in translucent clouds." In The 50th international meeting of physical chemistry: Molecules and grains in space. AIP, 1994. http://dx.doi.org/10.1063/1.46571.

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Yuan, Chi, and Junhan You. "MOLECULAR CLOUDS AND STAR FORMATION." In Proceedings of the 7th Guo Shoujing Summer School on Astrophysics. WORLD SCIENTIFIC, 1995. http://dx.doi.org/10.1142/9789814533935.

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Chevalier, Roger A. "Supernova remnants in molecular clouds." In The eleventh astrophysics conference on young supernova remnants. AIP, 2001. http://dx.doi.org/10.1063/1.1377080.

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Krumholz, Mark R., Eduardo Telles, Renato Dupke, and Daniela Lazzaro. "Star Formation in Molecular Clouds." In XV SPECIAL COURSES AT THE NATIONAL OBSERVATORY OF RIO DE JANEIRO. AIP, 2011. http://dx.doi.org/10.1063/1.3636038.

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Strong, Andy, Clive Dickinson, and Eric Murphy. "Synchrotron emission from molecular clouds." In Cosmic Rays and the InterStellar Medium. Trieste, Italy: Sissa Medialab, 2015. http://dx.doi.org/10.22323/1.221.0036.

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Reports on the topic "Molecular clouds"

1

Torres, D. High-Latitude Molecular Clouds as Gamma-Ray Sources for GLAST. Office of Scientific and Technical Information (OSTI), January 2005. http://dx.doi.org/10.2172/839757.

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M, Padovani, Galli D., Liam Scarlett, Grassi T., U. Rehill, Mark Zammit, Bray I., and D. Fursa. Ultraviolet H2 luminescence in molecular clouds induced by cosmic rays. Office of Scientific and Technical Information (OSTI), October 2023. http://dx.doi.org/10.2172/2377697.

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Digel, S. Small Molecular Clouds at High Latitudes as Gamma-Ray Sources for GLAST. Office of Scientific and Technical Information (OSTI), March 2005. http://dx.doi.org/10.2172/839933.

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Low, Mordecai-Mark Mac, Jayashree Toraskar, Jeffrey S. Oishi, and Tom Abel. Dynamical Expansion of HII Regions From Ultracompact to Compact Sizes in Turbulent, Self-Gravitating Molecular Clouds. Office of Scientific and Technical Information (OSTI), May 2006. http://dx.doi.org/10.2172/882832.

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King, P. K. Gas Dynamics Near and Far: Observational Magnetohydrodynamics of Interstellar Molecular Clouds and X-Ray Ablation of Asteroids for the Earth's Defense. Office of Scientific and Technical Information (OSTI), June 2019. http://dx.doi.org/10.2172/1544929.

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Shomer, Ilan, Louise Wicker, Uzi Merin, and William L. Kerr. Interactions of Cloud Proteins, Pectins and Pectinesterases in Flocculation of Citrus Cloud. United States Department of Agriculture, February 2002. http://dx.doi.org/10.32747/2002.7580669.bard.

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The overall objective was to understand the cloud flocculation of citrus juice by characterization of the interactions between proteins and pectins, and to determine the role of PE isozymes in catalyzing this phenomenon. Specific objectives were to: 1. identify/characterize cloud-proteins in relation to their coagulable properties and affinity to pectins; 2. to determine structural changes of PME and other proteins induced by cation/pectin interactions; 3. localize cloud proteins, PME and bound protein/pectates in unheated and pasteurized juices; 4. to create "sensitized" pectins and determine

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Bacharach, Eran, and Sagar Goyal. Generation of Avian Pneumovirus Modified Clones for the Development of Attenuated Vaccines. United States Department of Agriculture, November 2008. http://dx.doi.org/10.32747/2008.7696541.bard.

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Abstract (one page maximum, single spaced), include: List the original objectives, as defined in the approved proposal, and any revisions made at the beginning or during the course of project: The main goal described in our original proposal has been the development of a molecular infectious clone of the avian metapneumovirus subtype B (aMPV-B) and the modification of this clone to create mutated viruses for the development of attenuated vaccines. The Achievements and Appendix/Part I sections of this report describes the accomplishments in creating such a molecular clone. These sections also c

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Offner, S., M. Krumholz, R. Klein, and C. McKee. The Kinematics of Molecular Cloud Cores in the Presence of Driven and Decaying Turbulence: Comparisons with Observations. Office of Scientific and Technical Information (OSTI), April 2008. http://dx.doi.org/10.2172/938508.

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Banai, Menachem, and Gary Splitter. Molecular Characterization and Function of Brucella Immunodominant Proteins. United States Department of Agriculture, July 1993. http://dx.doi.org/10.32747/1993.7568100.bard.

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The BARD project was a continuation of a previous BARD funded research project. It was aimed at characterization of the 12kDa immunodominant protein and subsequently the cloning and expression of the gene in E. coli. Additional immunodominant proteins were sought among genomic B. abortus expression library clones using T-lymphocyte proliferation assay as a screening method. The 12kDa protein was identified as the L7/L12 ribosomal protein demonstrating in the first time the role a structural protein may play in the development of the host's immunity against the organism. The gene was cloned fro

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Newton, Ronald, Joseph Riov, and John Cairney. Isolation and Functional Analysis of Drought-Induced Genes in Pinus. United States Department of Agriculture, September 1993. http://dx.doi.org/10.32747/1993.7568752.bard.

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Drought is a common factor limiting timber production in the U.S. and Israel. Loblolly (Pinus taeda) and alleppo pine (Pinus halepensis) seedling survival is reduced when out planted, and growth and reproduction are often hindered by periodic droughts during later stages of tree development. Molecular and gene responses to drought stress have not been characterized. The objectives were to characterize drought-induced gene clones from these pines, to determine the effects of a growth regulator on drought tolerance, ABA levels, and drought-induced gene expression in alleppo pine, and to develop

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