Astronomy and Astrophysics – Astrophysics
Scientific paper
1995-11-27
Astronomy and Astrophysics
Astrophysics
Latex file of abstract. The postscript version of the complete paper (0.2 Mb in gzipped format) including all the figures can
Scientific paper
10.1086/117951
We discuss the results of a VLA HI survey of the Bootes void and compare the distribution and HI properties of the void galaxies to those of galaxies found in a survey of regions of mean cosmic density. The Bootes survey covers 1100 Mpc$^{3}$, or $\sim$ 1\% of the volume of the void and consists of 24 cubes of typically 2 Mpc * 2 Mpc * 1280 km/s, centered on optically known galaxies. Sixteen targets were detected in HI; 18 previously uncataloged objects were discovered directly in HI. The control sample consists of 12 cubes centered on IRAS selected galaxies with FIR luminosities similar to those of the Bootes targets and located in regions of 1 to 2 times the cosmic mean density. In addition to the 12 targets 29 companions were detected in HI. We find that the number of galaxies within 1 Mpc of the targets is the same to within a factor of two for void and control samples, and thus that the small scale clustering of galaxies is the same in regions that differ by a factor of $\sim$ 6 in density on larger scales. A dynamical analysis of the galaxies in the void suggests that on scales of a few Mpc the galaxies are gravitationally bound, forming interacting galaxy pairs, loose pairs and loose groups. One group is compact enough to qualify as a Hickson compact group. The galaxies found in the void are mostly late-type, gas rich systems. A careful scrutiny of their HI and optical properties shows them to be very similar to field galaxies of the same morphological type. This, combined with our finding that the small scale clustering of the galaxies in the void is the same as in the field, suggests that it is the near environment that mostly affects the evolution of galaxies.
Gregg Michael D.
Strauss Michael A.
Szomoru Arpad
van Gorkom Jacqueline H.
No associations
LandOfFree
An HI survey of the Bootes Void. II. The Analysis 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 An HI survey of the Bootes Void. II. The Analysis, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and An HI survey of the Bootes Void. II. The Analysis will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-632576