Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993egte.conf..227t&link_type=abstract
In NASA. Ames Research Center, The Evolution of Galaxies and Their Environment p 227-228 (SEE N93-26706 10-90)
Astronomy and Astrophysics
Astronomy
Astronomical Models, Dwarf Galaxies, H Ii Regions, Sky Surveys (Astronomy), Star Formation, Star Formation Rate, Brightness, High Resolution, Nonlinearity
Scientific paper
The star formation rate (SFR) in galaxies is believed to obey a power law relation with local gas density, first proposed by Schmidt (1959). Kennicutt (1989) has shown that there is a threshold density above which star formation occurs, and for densities at or near the threshold density, the DFR is highly non-linear, leading to bursts of star formation. Skillman (1987) empirically determined this threshold for dwarf galaxies to be approximately 1 x 10(exp 21) cm(exp -2), at a linear resolution of 500pc. During the course of our survey for HI companion clouds to HII galaxies, we obtained high resolution HI observations of five nearby HII galaxies. HII galaxies are low surface brightness, rich in HI, and contain one or a few high surface brightness knots whose optical spectra resemble those of HII regions. These knots are currently experiencing a burst of star formation. After Kennicutt (1989) we determine the critical density for star formation in the galaxies, and compare the predictions with radio and optical data.
Brinks Elias
Skillman Evan D.
Taylor Christopher Lee
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