Gas-rich dwarfs from the POSS-II. III. (Eder+, 2000)

Details Gas-rich dwarfs from the POSS-II. III. (Eder+, 2000) Gas-rich dwarfs from the POSS-II. III. (Eder+, 2000)

Mar 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001ycat..21310047e&link_type=abstract

VizieR On-line Data Catalog: J/ApJS/131/47. Originally published in: 2000ApJS..131...47E

Physics

Galaxies: Radio, H I Data, Radio Lines

Scientific paper

We present Arecibo neutral hydrogen data on a sample of optically selected dwarf galaxies. The sample ranges in H I mass from 106 to 5x109M&sun;, with a mean of 7.9x108M&sun;. Using estimated H I radii, the H I surface densities range from 0.6 to 20M&sun;/pc2, all well below the critical threshold for star formation (Kennicutt, 1998ApJ...498..541K). MHI/L values of the LSB dwarfs range from 0.3 to 12 with a mean value of 2.0. Dynamical masses, calculated from the H I profile widths, range from 108 to 1011M&sun;. There is a strong correlation between optical luminosity and dynamical mass for LSB dwarfs implying that the dark matter (whether baryonic or nonbaryonic) follows the detectable baryonic matter. (2 data files).

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