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 journalReview articlepeer-review

41 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 ICO/MH2 ratio is not the sme in ultraluminous galaxies as it is in Milky Way giant molecular clouds.

Original languageEnglish (US)
Pages (from-to)L9-L12
JournalAstrophysical Journal
Volume433
Issue number1 PART 2
DOIs
StatePublished - 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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