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Molecular gas in blue compact dwarf galaxies | | Luca Tancredi Barone
; Andreas Heithausen
; Susanne Huettemeister
; Thomas Fritz
; Ulrich Klein
; | | Date: |
15 May 2000 | | Journal: | Mon.Not.Roy.Astron.Soc. 317 (2000) 649 | | Subject: | astro-ph | | Affiliation: | 1,2), Andreas Heithausen , Susanne Huettemeister , Thomas Fritz , and Ulrich Klein ( Radioastronomisches Institut der Universitaet Bonn, Germany, Dipartimento di Astronomia, Universita’ degli Studi di Bologna, Italy | | Abstract: | Blue compact dwarf galaxies (BCDGs) are currently undergoing strong bursts of star formation. Nevertheless, only a few of them have been clearly detected in CO, which is thought to trace the "fuel" of star formation: H_2. In this paper, we present a deep search for CO J=1-->0 and J=2-->1 emission lines in a sample of 8 BCDGs and two companions. Only 2 of them (Haro 2 and UM 465) are detected. For the other galaxies we have obtained more stringent upper limits on the CO luminosity than published values. We could not confirm the previously reported ``detection’’ of CO for the galaxies UM 456 and UM 462. We analyze a possible relation between metallicity, CO luminosity, and absolute blue magnitude of the galaxies. We use previously determined relations between X = N(H_2)/I_CO and the metallicity to derive molecular cloud masses or upper limits for them. With these ``global’’ X_CO values we find that for those galaxies which we detect in CO, the molecular gas mass is similar to the HI mass, whereas for the non-detections, the upper limits on the molecular gas masses are significantly lower than the HI mass. Using an LVG (Large Velocity Gradient) model we show that X_CO depends not only on metallicity, but also on other physical parameters such as volume density and kinetic temperature, which rises the question on the validity of ``global’’ X_CO factors. | | Source: | arXiv, astro-ph/0005311 | | Services: | Forum | Review | PDF | Favorites | |
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