HI observations of blue compact galaxies from the first and second Byurakan surveys

Citation
Tx. Thuan et al., HI observations of blue compact galaxies from the first and second Byurakan surveys, ASTR AST SS, 139(1), 1999, pp. 1-24
Citations number
61
Categorie Soggetti
Space Sciences
Journal title
ASTRONOMY & ASTROPHYSICS SUPPLEMENT SERIES
ISSN journal
03650138 → ACNP
Volume
139
Issue
1
Year of publication
1999
Pages
1 - 24
Database
ISI
SICI code
0365-0138(199910)139:1<1:HOOBCG>2.0.ZU;2-T
Abstract
We present the results of a neutral hydrogen survey of 79 galaxies from a s tatistical sample of 88 Blue Compact Galaxies (BCGs) selected from the Firs t and Second Byurakan objective prism surveys to have a HII region-like spe ctrum, an equivalent width of the [O III] lambda 5007 line larger than simi lar to 50 Angstrom, and a velocity less than or equal to 6000 km s(-1). The detection rate for the statistical sample is 74%. HI masses range between 4 10(7) M-. and 5 10(9) M-. with the HI mass distribution peaking at 3 10(8 ) M-.. The full width at half-maximum of the KI profile varies between simi lar to 30 km s(-1) and 160 km s(-1), with a mean of similar to 92 km s(-1). These small widths are characteristic of dwarf galaxies. For comparison, p ie have also observed an additional 92 BCGs with weaker star formation and/ or larger distances, and/or interesting astrophysical properties. These in general have larger widths and HI masses.