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Cold Molecular Gas as Baryonic Dark Matter

Published online by Cambridge University Press:  26 May 2016

Daniel Pfenniger
Daniel Pfenniger*
Affiliation:
Geneva Observatory, University of Geneva, Sauverny, Switzerland

Abstract

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We review the different cold dark gas models that have been proposed in the literature, as well as a new variant which addresses their principal stability problems by taking into account the property of molecular hydrogen to become solid or liquid below 33 K and at sufficiently high pressure. This new physical ingredient provides the possibility to stabilise cold gas globules by a core of condensed molecular hydrogen. Such loosely bound cold globules behave in a galaxy as a collisionless ensemble of matter, and form a reservoir of gas easily liberated through, e.g., UV excitation. the cold condensed cores survive the longest, of order a Gyr in the solar neighbourhood radiation field, and much longer in spiral outer HI disks.

Type
Part 7: Baryonic Dark Matter
Information
Symposium - International Astronomical Union , Volume 220: Dark Matter in Galaxies , 2004 , pp. 241 - 248
Copyright
Copyright © Astronomical Society of the Pacific 2004 

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