NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-06-17 T10:32:31 PDT
Help | Comment | NED Home

For refcode 2000ApJ...541..142R:
Retrieve 4 NED objects in this reference.
Please click here for ADS abstract

NED Abstract

Copyright by American Astronomical Society. Reproduced by permission
2000ApJ...541..142R Overluminous CO in the Central Regions of Spiral Galaxies Michael W. Regan Carnegie Institution of Washington, Department of Terrestrial Magnetism, 5241 Broad Branch Road, Washington, DC 20015 Received 1999 December 9; accepted 2000 April 21 ABSTRACT Even though the interstellar medium (ISM) in a galaxy plays a critical role in its evolution, it is difficult to quantitatively measure the ISM content of a galaxy when the gas is primarily molecular. In this paper I present a method for quantitatively deriving the dust mass in a galaxy using optical and near-infrared images. These images are used as inputs to a radiative transfer model to generate a dust optical depth map. By simulating observational errors, I show that up to an optical depth of A_V_ = 8 the model is not affected by saturation effects. The method is then applied to the central region (<1.5 kpc) of four nearby spiral galaxies and is used to calibrate the conversion factor between CO luminosity and H2 mass. The resulting conversion factor shows that the CO is overluminous by a factor of at least 5-20 compared to the CO in the solar neighborhood. I also show that in the absence of a full set of optical and near-infrared colors an I-K color map is a good qualitative representation of the dust morphology of a galaxy. Subject headings: galaxies: ISM-galaxies: nuclei-galaxies: spiral-ISM: molecules-radio lines: galaxies
Retrieve 4 NED objects in this reference.
Please click here for ADS abstract

Back to NED Home