Astronomy and Astrophysics – Astrophysics
Scientific paper
1997-04-03
Astron.J.114:1313,1997
Astronomy and Astrophysics
Astrophysics
35 pages Latex (aaspp4.sty) including all tables and 7 postscript figures. Figs 1,2,3 available at ftp://ftp.hq.eso.org/incomi
Scientific paper
10.1086/118565
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 HI survey carried out at Parkes, with detection limits of 4 \times 10^6 \Msun and 7.8 \times 10^6 \Msun , and 33 dwarf galaxies were successfully detected in the groups. A follow-up optical survey (Halpha spectroscopy) detected a few more, and confirmed most of the HI 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 virialised.
Carignan Claude
Cote Stephanie
Freeman Ken
Quinn Peter
No associations
LandOfFree
Discovery of Numerous Dwarf Galaxies in the Two Nearest Groups of Galaxies does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Discovery of Numerous Dwarf Galaxies in the Two Nearest Groups of Galaxies, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Discovery of Numerous Dwarf Galaxies in the Two Nearest Groups of Galaxies will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-422846