Studies of galaxies in voids
I. 
observations
of Blue Compact Galaxies
1
Special Astrophysical Observatory RAS, Nizhnij Arkhyz, Karachai-Circassia 369167, Russia
2
Isaac Newton Institute of Chile, SAO Branch
3
Observatoire de Paris-Meudon, Meudon, France
4
Max-Planck-Institut für Radioastronomie, 53121 Bonn, Germany
5
Wise Observatory, Tel-Aviv University, Tel-Aviv 69978, Israel
6
Astrophysikalisches Institut Potsdam, An der Sternwarte 16, 14482 Potsdam, Germany
Corresponding author: S. Pustilnik, sap@sao.ru
Received:
7
May
2001
Accepted:
16
April
2002
We present here results of studies of the properties of galaxies located in
very low density environments. We observed 26 blue compact galaxies
(BCGs) from the Second Byurakan (SBS) and Case surveys located in voids
with the radial velocities 
11 000 km s-1, two BCGs in the
void behind the Virgo cluster and 11 BCGs in denser environments.
fluxes and profile widths, as well as estimates of total
masses, are presented for the 27 detected galaxies (of which 6 are
in three galaxy pairs and are not resolved by the radiotelescope beam).
Preliminary comparisons of void BCGs with similar objects from intermediate
density regions – in the general field and the Local Supercluster
(sub-samples of BCGs in the SBS zone) and in the dense environment of the
Virgo Cluster (a BCD sample) – are performed using the
hydrogen-to-blue-luminosity ratio 
/LB. We find that
for
the same blue luminosity, for 
18
0, BCGs in lower density
environment have on average more . The slope β
of the /
for BCGs shows a trend
of steepening with decreasing bright galaxy density, being very close
to zero for the densest environment considered here and reaching
β = -0.4 for voids.
Key words: large-scale structure of universe / galaxies: dwarf / galaxies: interactions / radio lines: galaxies
© ESO, 2002