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Warm to Cold HI Phase Transition in Galaxy Disks - Yaron Radai
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Warm to Cold HI Phase Transition in Galaxy Disks - neues Buch

2012, ISBN: 9783659257254

ID: 670252111

A well known feature of galaxy disks is the radial cutoff in star formation rate (SFR) and surface brightness while the HI component stretches far onwards. This suggests towards the existence of a star formation threshold (SFT) in the form of a critical gas column density, below which the SFR diminishes. This work advances our understanding of the SFT by studying the warm (~10,000K) to cold (~100K) HI phase transition in self-gravitating galactic gas disks. Assuming them thin, starless, isothermal, and warm, I construct a semi-analytic model for computing their physical properties under hydrostatic equilibrium and ionization-recombination balance. The disks are coupled via photoionizations to the metagalactic radiation background, and are confined by the pressure of a hot, ambient galactic corona. As a result, I find the critical columns under which the phase transition may and must occur at the mid-plane, thus bounding the critical column for cold gas formation between lower and upper limits and setting a lower limit upon the SFT. In the process I gain insight into the properties of warm gas galaxy disks, exposing a nice interplay between pressure, gravity, radiation and opacity. A Star Formation Threshold Bücher > Fremdsprachige Bücher > Englische Bücher Taschenbuch 20.10.2012, LAP Lambert Academic Publishing, .201

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Warm to Cold HI Phase Transition in Galaxy Disks - Yaron Radai
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Yaron Radai:
Warm to Cold HI Phase Transition in Galaxy Disks - neues Buch

ISBN: 9783659257254

ID: 732424177

A well known feature of galaxy disks is the radial cutoff in star formation rate (SFR) and surface brightness while the HI component stretches far onwards. This suggests towards the existence of a star formation threshold (SFT) in the form of a critical gas column density, below which the SFR diminishes. This work advances our understanding of the SFT by studying the warm (~10,000K) to cold (~100K) HI phase transition in self-gravitating galactic gas disks. Assuming them thin, starless, isothermal, and warm, I construct a semi-analytic model for computing their physical properties under hydrostatic equilibrium and ionization-recombination balance. The disks are coupled via photoionizations to the metagalactic radiation background, and are confined by the pressure of a hot, ambient galactic corona. As a result, I find the critical columns under which the phase transition may and must occur at the mid-plane, thus bounding the critical column for cold gas formation between lower and upper limits and setting a lower limit upon the SFT. In the process I gain insight into the properties of warm gas galaxy disks, exposing a nice interplay between pressure, gravity, radiation and opacity. A Star Formation Threshold Buch (fremdspr.) Bücher>Fremdsprachige Bücher>Englische Bücher, LAP Lambert Academic Publishing

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Warm to Cold HI Phase Transition in Galaxy Disks - Yaron Radai
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Yaron Radai:
Warm to Cold HI Phase Transition in Galaxy Disks - neues Buch

ISBN: 9783659257254

ID: 6c7fb552c843a03699451dc7fc95eb5a

A well known feature of galaxy disks is the radial cutoff in star formation rate (SFR) and surface brightness while the HI component stretches far onwards. This suggests towards the existence of a star formation threshold (SFT) in the form of a critical gas column density, below which the SFR diminishes. This work advances our understanding of the SFT by studying the warm (~10,000K) to cold (~100K) HI phase transition in self-gravitating galactic gas disks. Assuming them thin, starless, isothermal, and warm, I construct a semi-analytic model for computing their physical properties under hydrostatic equilibrium and ionization-recombination balance. The disks are coupled via photoionizations to the metagalactic radiation background, and are confined by the pressure of a hot, ambient galactic corona. As a result, I find the critical columns under which the phase transition may and must occur at the mid-plane, thus bounding the critical column for cold gas formation between lower and upper limits and setting a lower limit upon the SFT. In the process I gain insight into the properties of warm gas galaxy disks, exposing a nice interplay between pressure, gravity, radiation and opacity. Bücher / Naturwissenschaften, Medizin, Informatik & Technik / Physik & Astronomie

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Warm to Cold HI Phase Transition in Galaxy Disks: A Star Formation Threshold - Yaron Radai
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Yaron Radai:
Warm to Cold HI Phase Transition in Galaxy Disks: A Star Formation Threshold - Taschenbuch

2012, ISBN: 3659257257

Taschenbuch, [EAN: 9783659257254], LAP LAMBERT Academic Publishing, LAP LAMBERT Academic Publishing, Book, [PU: LAP LAMBERT Academic Publishing], 2012-10-18, LAP LAMBERT Academic Publishing, 56375011, Physik, 56376011, Akustik & Schall, 56427011, Angewandte Physik, 56429011, Astrophysik & Raumforschung, 56428011, Biophysik, 56270011, Chaos & Systeme, 56090011, Chemische Physik, 56378011, Dynamik, 56414011, Elektromagnetismus, 56383011, Energie, 56422011, Entropie, 56398011, Festkörperphysik, 56127011, Geophysik, 56404011, Kernphysik, 56377011, Kosmologie, 56386011, Licht, 56421011, Maschinenbau & Technik, 56272011, Mathematische Physik, 56389011, Mechanik, 56390011, Molekularphysik, 56391011, Nanostrukturen, 56392011, Optik, 56397011, Quantentheorie, 56393011, Relativität, 56385011, Schwerkraft, 1320310031, Statik, 56395011, Systemtheorie, 56396011, Wellen & Wellenmechanik, 56201011, Zeit, 56047011, Fachbücher, 54071011, Genres, 52044011, Fremdsprachige Bücher

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Warm to Cold HI Phase Transition in Galaxy Disks als Buch von Yaron Radai - Yaron Radai
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Warm to Cold HI Phase Transition in Galaxy Disks als Buch von Yaron Radai - gebunden oder broschiert

ISBN: 9783659257254

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Warm to Cold HI Phase Transition in Galaxy Disks:A Star Formation Threshold Yaron Radai Warm to Cold HI Phase Transition in Galaxy Disks:A Star Formation Threshold Yaron Radai Bücher > Wissenschaft > Physik, LAP Lambert Academic Publishing

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Detailangaben zum Buch - Warm to Cold HI Phase Transition in Galaxy Disks


EAN (ISBN-13): 9783659257254
ISBN (ISBN-10): 3659257257
Gebundene Ausgabe
Taschenbuch
Erscheinungsjahr: 2012
Herausgeber: LAP LAMBERT Academic Publishing

Buch in der Datenbank seit 27.03.2007 11:08:46
Buch zuletzt gefunden am 04.09.2017 22:02:37
ISBN/EAN: 3659257257

ISBN - alternative Schreibweisen:
3-659-25725-7, 978-3-659-25725-4


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