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Record 16 of 766
The extent of CO in the early-type galaxy NGC 4472
Author and Affiliation:
Hutchtmeier, W. K.(Max-Planck-Institut fuer Radioastronomie Auf dem Hugel, Bonn, Germany)
Bregman, J. N.(Univ. of Michigan, Ann Arbor, MI, United States)
Hogg, D. E.(National Radio Astronomy Observatory, Charlotsville, VA, United States)
Roberts, M. S.(National Radio Astronomy Observatory, Charlotsville, VA, United States)
Abstract: NGC 4472, and E/SO system, is the earliest type normal galaxy with detected CO emission, and here we present additional radio observations in the lines of CO(1-0) and CO(2-1) to determine the distribution and internal properties of this gas. The original detection is reconfirmed, but observations at five surrounding locations and at two other locations in the galaxy do not show the gas to be extended; the total H2 gas mass is estimated to be 4 x 10(exp 7) solar mass. A high CO(1-0)/CO(2-1) brightness temperature ratio is found (greater than 3), which is indicative of subthermal excitation of the CO(2-1) line that can occur at low gas temperatures and low gas densities. Also, upper limits are given for the CO(2-1) fluxes in four other early-type galaxies.
Publication Date: Jan 10, 1994
Document ID:
19950043612
(Acquired Dec 28, 1995)
Accession Number: 95A75211
Subject Category: ASTRONOMY
Document Type: Journal Article
Publication Information: Astronomy and Astrophysics (ISSN 0004-6361); 281; 2; p. 327-330
Publisher Information: Germany
Contract/Grant/Task Num: NAGW-2135
Financial Sponsor: NASA; United States
Organization Source: NASA; Washington, DC, United States
Description: 4p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: CARBON MONOXIDE; ELLIPTICAL GALAXIES; EMISSION SPECTRA; INTERSTELLAR GAS; LINE SPECTRA; MOLECULAR SPECTRA; RADIO ASTRONOMY; RADIO SPECTRA; ASTRONOMICAL SPECTROSCOPY; BRIGHTNESS TEMPERATURE; HYDROGEN; MILLIMETER WAVES; RADIO TELESCOPES
Imprint And Other Notes: Astronomy and Astrophysics vol. 281, no. 2 p. 327-330 January 10, 1994
Miscellaneous Notes: Research sponsored by NSF and MPIfR
Availability Source: Other Sources
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