RESULTS OF A SEARCH FOR FAINT GALAXIES IN VOIDS

Citation
B. Kuhn et al., RESULTS OF A SEARCH FOR FAINT GALAXIES IN VOIDS, Astronomy and astrophysics, 318(2), 1997, pp. 405-415
Citations number
26
Categorie Soggetti
Astronomy & Astrophysics
Journal title
ISSN journal
00046361
Volume
318
Issue
2
Year of publication
1997
Pages
405 - 415
Database
ISI
SICI code
0004-6361(1997)318:2<405:ROASFF>2.0.ZU;2-B
Abstract
We present the results of a search for intrinsically faint galaxies to wards three regions with known voids and the Hercules supercluster. Th e intention was to identify galaxies of low luminosity in order to fin d possibly a galaxy population in the voids. Within these selected fie lds we increased the range of observations in comparison with the rece nt large field surveys which revealed the non-uniform spatial distribu tion of galaxies. The limiting magnitude was raised by about 5 magn., the limiting surface brightness by 2 mag/square'', and the limiting di ameter reduced to less than 1/3. The individual observational data of our sample are published in the previous Paper I (Hopp et al. 1995) wh ich describes our search strategy and contains B and R magnitudes, app arent diameters, redshifts and galaxy types of about 200 newly identif ied objects. Their luminosity distribution demonstrates a relatively h igh percentage of dwarfish galaxies. As the essential result of our su rvey we have to point out that no clear indication of a void-populatio n was found. The majority of our objects lie outside voids in regions where the already known galaxies are concentrated. Some are located in the middle or near the edges of voids. They appear to be rather isola ted, their distances to the nearest neighbour are quite large. Only fe w of our objects seem to be real void galaxies. Even in the three near est and rather well defined voids we do not find any hitherto unknown galaxy.