A comparison of dynamical and molecular gas masses in very luminous infrared galaxies

L. M. Shier; M. J. Rieke; G. H. Rieke

doi:10.1086/187535

A comparison of dynamical and molecular gas masses in very luminous infrared galaxies

L. M. Shier, M. J. Rieke, G. H. Rieke

Research output: Contribution to journal › Review article › peer-review

42 Scopus citations

Abstract

Observations of the 2.3 μm bands of CO have been used to measure the central stellar velocity dispersions in NGC 1614 and IC 694. K-band images were used to constrain models of the stellar mass distribution. With these data and a spectrum of Arp 220 from the literature, we have determined the total mass within the central regions of all three galaxies. The central molecular gas masses inferred from ¹²CO J = 1-0 fluxes are larger than the total masses determined from stellar kinematics. Subtraction of the likely stellar mass from the total mass yields upper limits for the H₂ mass that are 4-10 times less than the previously reported masses. This result supports other arguments that the I_CO/M_H2 ratio is not the sme in ultraluminous galaxies as it is in Milky Way giant molecular clouds.

Original language	English (US)
Pages (from-to)	L9-L12
Journal	Astrophysical Journal
Volume	433
Issue number	1 PART 2
DOIs	https://doi.org/10.1086/187535
State	Published - Sep 20 1994

Keywords

Galaxies: ISM
Galaxies: kinematics and dynamics

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.1086/187535

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title = "A comparison of dynamical and molecular gas masses in very luminous infrared galaxies",

abstract = "Observations of the 2.3 μm bands of CO have been used to measure the central stellar velocity dispersions in NGC 1614 and IC 694. K-band images were used to constrain models of the stellar mass distribution. With these data and a spectrum of Arp 220 from the literature, we have determined the total mass within the central regions of all three galaxies. The central molecular gas masses inferred from 12CO J = 1-0 fluxes are larger than the total masses determined from stellar kinematics. Subtraction of the likely stellar mass from the total mass yields upper limits for the H2 mass that are 4-10 times less than the previously reported masses. This result supports other arguments that the ICO/MH2 ratio is not the sme in ultraluminous galaxies as it is in Milky Way giant molecular clouds.",

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TY - JOUR

T1 - A comparison of dynamical and molecular gas masses in very luminous infrared galaxies

AU - Shier, L. M.

AU - Rieke, M. J.

AU - Rieke, G. H.

PY - 1994/9/20

Y1 - 1994/9/20

N2 - Observations of the 2.3 μm bands of CO have been used to measure the central stellar velocity dispersions in NGC 1614 and IC 694. K-band images were used to constrain models of the stellar mass distribution. With these data and a spectrum of Arp 220 from the literature, we have determined the total mass within the central regions of all three galaxies. The central molecular gas masses inferred from 12CO J = 1-0 fluxes are larger than the total masses determined from stellar kinematics. Subtraction of the likely stellar mass from the total mass yields upper limits for the H2 mass that are 4-10 times less than the previously reported masses. This result supports other arguments that the ICO/MH2 ratio is not the sme in ultraluminous galaxies as it is in Milky Way giant molecular clouds.

AB - Observations of the 2.3 μm bands of CO have been used to measure the central stellar velocity dispersions in NGC 1614 and IC 694. K-band images were used to constrain models of the stellar mass distribution. With these data and a spectrum of Arp 220 from the literature, we have determined the total mass within the central regions of all three galaxies. The central molecular gas masses inferred from 12CO J = 1-0 fluxes are larger than the total masses determined from stellar kinematics. Subtraction of the likely stellar mass from the total mass yields upper limits for the H2 mass that are 4-10 times less than the previously reported masses. This result supports other arguments that the ICO/MH2 ratio is not the sme in ultraluminous galaxies as it is in Milky Way giant molecular clouds.

KW - Galaxies: ISM

KW - Galaxies: kinematics and dynamics

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U2 - 10.1086/187535

DO - 10.1086/187535

M3 - Review article

SN - 0004-637X

VL - 433

SP - L9-L12

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 1 PART 2

ER -

A comparison of dynamical and molecular gas masses in very luminous infrared galaxies

Abstract

Keywords

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