Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...433l...9s&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 433, no. 1, p. L9-L12
Astronomy and Astrophysics
Astronomy
49
Carbon Monoxide, Galactic Mass, Galaxies, Gas Dynamics, Hydrogen, Infrared Astronomy, Interstellar Gas, Mass Distribution, Molecular Clouds, Astronomical Photography, Astronomical Spectroscopy, Infrared Photography, Infrared Telescopes, Kinematics, Luminosity, Near Infrared Radiation
Scientific paper
Observations of the 2.3 micron 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 (12)CO 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 same in ultraluminous galaxies as it is in Milky Way giant molecular clouds.
Rieke George H.
Rieke Marcia J.
Shier Lisa Marie
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