Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aspc..407..106r&link_type=abstract
The Low-Frequency Radio Universe ASP Conference Series, Vol. 407, proceedings of the conference held 8-12 December 2008, at Nati
Astronomy and Astrophysics
Astrophysics
Scientific paper
We study the relationship between the gas column density (sgas) and the star formation rate surface density (ssfr) for a sample of extremely faint dwarf irregular galaxies. All galaxies were observed at sim400 pc linear resolution in two wavebands, viz. HI and FUV. ssfr\ is derived from GALEX data, while sgas\ is derived from the GMRT based FIGGS HI 21 cm survey data. We find that sgas\ averaged over the star forming region of the disk lies below most estimates of the ``threshold density'' for star formation, and that the average ssfr\ is also lower than would be expected from the ``Kennicutt-Schmidt'' law
(Kennicutt, 1998a). We also use our data to look for small scale (400 pc and 200 pc) correlations between ssfr\ and sgas. For 18 of our 23 galaxies, we find that ssfr\ can be parametrized as having a power law dependence on sgas. The power law relation holds until one reaches the sensitivity limit of the GALEX data, i.e. we find no evidence for a ``threshold density'' below which star formation is completely cut off.
Begum Ayesha
Chengalur Jayaram N.
Karachentsev Igor D.
Roychowdhury Suparna
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