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For refcode 1997AJ....114.1313C:
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1997AJ....114.1313C DISCOVERY OF NUMEROUS DWARF GALAXIES IN THE TWO NEAREST GROUPS OF GALAXIES STEPHANIE COTE European Southern Observatory, Karl-Schwarzschild Str. 2, D-85748 Garching, Germany Electronic mail: scote@eso.org KENNETH C. FREEMAN Mount Stromlo Observatory, P.M.B. Weston Creek, ACT 2611, Australia Electronic mail: kcf@msokcf.anu.edu.au CLAUDE CARIGNAN Departement de Physique et Observatoire du Mont Megantic, Universite de Montreal, C.P. 6128, Succ. A, Montreal, Quebec H3C 3J7, Canada Electronic mail: claude@astro.umontreal.ca PETER J. QUINN European Southern Observatory, Karl-Schwarzschild Str. 2, D-85748 Garching, Germany Electronic mail: pjq@eso.org Received 1997 March 21; revised 1997 May 28 ABSTRACT We report the discovery of a large population of dwarf irregular galaxies in the two nearest groups of galaxies outside the Local Group, the Sculptor and the Centaurus A groups (2.5 and 3.5 Mpc). Total areas of approximately 940 and 910 square degrees in these groups were scanned visually on the SRC J films to find dwarf candidates. Redshifts were obtained by an H I survey carried out at Parkes, with detection limits of 4 x 10^6^ M_sun_ and 7.8 x 10^6^ M_sun_, and 33 dwarf galaxies were successfully detected in the groups. A follow-up optical survey (H{alpha} spectroscopy) detected a few more, and confirmed most of the H I redshifts. A total of 16 and 20 dwarf galaxies are found in Sculptor and Centaurus A, of which 6 are newly identified objects, and 5 more have newly determined redshifts. In both groups the dwarf members show a wider spatial and velocity distribution than the brighter members. From their radial velocities and projected distances we estimate the crossing times of the groups, which confirm that they are not yet virialized.
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