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Title:
Deep search for CO emission in the Low Surface Brightness galaxy Malin 1
Authors:
Braine, J.; Herpin, F.; Radford, S. J. E.
Affiliation:
AA(Observatoire de Bordeaux, UMR 5804, CNRS/INSU, B.P. 89, 33270 Floirac, France), AB(Observatoire de Bordeaux, UMR 5804, CNRS/INSU, B.P. 89, 33270 Floirac, France; CSIC, IEM, Departemento de Fisica Molecular, Serrano 121, 28006 Madrid, Spain), AC(National Radio Astronomy Observatory, 949 N. Cherry Ave., Tucson, AZ 85721, USA)
Publication:
Astronomy and Astrophysics, v.358, p.494-498 (2000) (A&A Homepage)
Publication Date:
06/2000
Origin:
A&A
A&A Keywords:
GALAXIES: ABUNDANCES, GALAXIES: EVOLUTION, GALAXIES: INDIVIDUAL: MALIN 1, GALAXIES: ISM, GALAXIES: SPIRAL, RADIO LINES: GALAXIES
Bibliographic Code:
2000A&A...358..494B

Abstract

A sensitive search for CO emission from the Low Surface Brightness Galaxy Malin 1 has yielded negative results. The nucleus and several positions corresponding to regions of star formation in the disk were observed in the CO(1-0) and CO(2-1) lines with no detection. Use of a ``standard'' N(H_2) / I_CO(1-0) conversion factor yields M_H2/M_{HI < 0.03. However, rather than argue that there is very little molecular gas in Malin 1, where some star formation is currently taking place, we attribute the non-detection chiefly to the low temperature of the gas. Detection of CO may be rendered still more difficult by a subsolar metallicity.

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