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Status: Bibliographieeintrag
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Verfasst von:Leroy, Adam K. [VerfasserIn]   i
 Bigiel, Frank [VerfasserIn]   i
 Kruijssen, Diederik [VerfasserIn]   i
 Cormier, Diane [VerfasserIn]   i
 Jiménez-Donaire, Maria Jesús [VerfasserIn]   i
 Schinnerer, Eva [VerfasserIn]   i
Titel:Millimeter-wave line ratios and sub-beam volume density distributions
Verf.angabe:Adam K. Leroy, Antonio Usero, Andreas Schruba, Frank Bigiel, J.M. Diederik Kruijssen, Amanda Kepley, Guillermo A. Blanc, Alberto D. Bolatto, Diane Cormier, Molly Gallagher, Annie Hughes, Maria J. Jimenez-Donaire, Erik Rosolowsky, Eva Schinnerer
Jahr:2016
Umfang:24 S.
Fussnoten:Gesehen am 26.10.2017
Titel Quelle:Enthalten in: De.arxiv.org
Ort Quelle:[S.l.] : Arxiv.org, 1991
Jahr Quelle:2016
Band/Heft Quelle:(2016) Artikel-Nummer 1611.09864, 24 Seiten
Abstract:We explore the use of mm-wave emission line ratios to trace molecular gas density when observations integrate over a wide range of volume densities within a single telescope beam. For observations targeting external galaxies, this case is unavoidable. Using a framework similar to that of Krumholz and Thompson (2007), we model emission for a set of common extragalactic lines from lognormal and power law density distributions. We consider the median density of gas producing emission and the ability to predict density variations from observed line ratios. We emphasize line ratio variations, because these do not require knowing the absolute abundance of our tracers. Patterns of line ratio variations have the prospect to illuminate the high-end shape of the density distribution, and to capture changes in the dense gas fraction and median volume density. Our results with and without a high density power law tail differ appreciably; we highlight better knowledge of the PDF shape as an important area. We also show the implications of sub-beam density distributions for isotopologue studies targeting dense gas tracers. Differential excitation often implies a significant correction to the naive case. We provide tabulated versions of many of our results, which can be used to interpret changes in mm-wave line ratios in terms of changes in the underlying density distributions.
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Kostenfrei: Volltext: http://arxiv.org/abs/1611.09864
Datenträger:Online-Ressource
Sprache:eng
Sach-SW:Astrophysics - Astrophysics of Galaxies
K10plus-PPN:1564790703
Verknüpfungen:→ Sammelwerk

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