Molecular gas in the Andromeda galaxy
Ch. Nieten,N. Neininger,N. Neininger,M. Guelin,H. Ungerechts,R. Lucas,Elly M. Berkhuijsen,Rainer Beck,Richard Wielebinski +8 more
TLDR
M 31, the closest large spiral galaxy to our own, is the best object for studying molecular clouds and their relation to the spiral structure as discussed by the authors, and it is also one of the best places where to estimate molecular clouds masses through the Virial Theorem.Abstract:
M 31, the closest large spiral galaxy to our own, is the best object for studying molecular clouds and their relation to the spiral structure. As one of the astronomical objects with the best known distance (0.78 ± 0.02 Mpc), it is also one of the best places where to estimate molecular clouds masses through the Virial Theorem.read more
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Physics of the Interstellar and Intergalactic Medium
TL;DR: In this paper, a comprehensive and richly illustrated textbook on the astrophysics of the interstellar and intergalactic medium is presented, including the gas and dust, as well as the electromagnetic radiation, cosmic rays, and magnetic and gravitational fields, present between the stars in a galaxy and also between galaxies themselves.
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The Role of Pressure in GMC Formation II: The H2-Pressure Relation
Leo Blitz,Erik Rosolowsky +1 more
TL;DR: In this article, the authors show that the ratio of molecular to atomic gas in galaxies is determined by hydrostatic pressure and that the relation between the two is nearly linear, and propose a modified star formation prescription based on pressure determining the degree to which the ISM is molecular.
Journal ArticleDOI
The CO-to-H2 Conversion Factor from Infrared Dust Emission across the Local Group
Adam K. Leroy,Alberto D. Bolatto,Karl D. Gordon,Karin Sandstrom,Pierre Gratier,Erik Rosolowsky,Charles W. Engelbracht,N. Mizuno,Edvige Corbelli,Yasuo Fukui,Akiko Kawamura +10 more
TL;DR: In this paper, the authors estimate the conversion factor relating CO emission to H2 mass, αCO, in five Local Group galaxies that span approximately an order of magnitude in metallicity.
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The CO-to-H2 Conversion Factor From Infrared Dust Emission Across the Local Group
Adam K. Leroy,Alberto D. Bolatto,Karl D. Gordon,Karin Sandstrom,Pierre Gratier,Erik Rosolowsky,Charles W. Engelbracht,N. Mizuno,Edvige Corbelli,Yasuo Fukui,Akiko Kawamura +10 more
TL;DR: In this paper, the authors modeled the dust mass along the line of sight from infrared (IR) emission and then solved for the alpha-CO that best allows a single gas-to-dust ratio (delta_GDR) to describe each system.
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On the fraction of star formation occurring in bound stellar clusters
TL;DR: In this article, the authors present a theoretical framework in which bound stellar clusters arise naturally at the high-density end of the hierarchy of the interstellar medium (ISM) and due to short free-fall times, these high density regions achieve high local star formation efficiencies, enabling them to form bound clusters.
References
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High Resolution IRAS Maps and IR Emission of M31 --- II. Diffuse Component and Interstellar Dust
Cong Xu,George Helou +1 more
TL;DR: In this paper, a radiative transfer model for large-scale dust heating and cooling in the diffuse medium of M31 is studied using the HiRes IRAS maps in conjunction with UV, optical and the HI maps.