Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Studies of galaxies in voids. I. HI observations of Blue Compact
  Galaxies   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 V < 11000 km/s, two BCGs in the void behind the Virgo cluster and 11
BCGs in denser environments. HI fluxes and profile widths, as well as estimates
of total HI 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
M(HI)/L_B. We find that for the same blue luminosity, for M_B > -18.0, BCGs in
lower density environment have on average more HI. The slope (beta) of the
M(HI)/L_B proportional to L^(beta) 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 (beta) = -0.4 for voids.

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The categories of this paper are: math
18
The categories of this paper are: econ
22
The categories of this paper are: chao-dyn
25
The categories of this paper are: patt-sol
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The categories of this paper are: cs
16
The categories of this paper are: stat
30
The categories of this paper are: q-alg
27
The categories of this paper are: comp-gas
19
The categories of this paper are: eess
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The categories of this paper are: hep-ex
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The categories of this paper are: hep-lat
21
The categories of this paper are: adap-org
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The categories of this paper are: nucl-th
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The categories of this paper are: plasm-ph
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The categories of this paper are: physics
31
The categories of this paper are: ao-sci