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1998ApJS..118..327Kapahi+
See also MRC 1Jy sample I.
and MRC 1Jy sample III.
The Molonglo Reference Catalog 1 Jy Radio Source Survey. II. Radio
Structures of Galaxy Identifications
VIJAY K. KAPAHI, 1 RAMANA M. ATHREYA, 1 WIL VAN BREUGEL, 2 PATRICK J.
MCCARTHY, 3 AND C. R. SUBRAHMANYA 1
Received 1998 February 5; accepted 1998 May 1
ABSTRACT
This is the second in a series of papers discussing the radio, optical,
and near-IR properties of a large and complete sample of radio sources
selected from the Molonglo Reference Catalog (MRC) at 408 MHz. The sample
consists of 557 radio sources from the MRC that have S0.408 >= 0.95 Jy,
-30deg < delta < -20deg, and |b| >= 20 but excluding the right
ascension range of 14h03m -- 20h20m. While 111 of these are identified
with quasars (including six with BL Lac objects), a vast majority of the
rest are identified with galaxies. Only a small fraction (~2%) appear
to have no optical or near-IR counterparts down to an r magnitude of
~24 or a K magnitude of ~19. A similar fraction have ambiguous
identifications. This paper presents the radio structures of the 446 radio
sources in the sample that are either identified with galaxies or that have
remained unidentified. Most of the structural information given in the paper
is based on high-resolution ([∼]1[&arcsec;][–]10[&arcsec;])
observations made with the Very Large Array at a frequency of 4.86 GHz.
Several of the large or diffuse sources were also observed at 1.41 GHz.
Contour plots of the radio images are also presented for the well-resolved
sources. A substantial fraction (~20%) of the sources in the galaxy
sample is found to be of the "compact steep spectrum" variety with alpha
{4.86}_{0.408}>0.5 and linear size l ~20 kpc (for H0 = 50 km s-1 Mpc-1; q0 = 0.5).
CONTENTS
* 1. INTRODUCTION
* 2. SAMPLE DEFINITION
* 3. OBSERVATIONS AND DATA REDUCTION
* 4. RESULTS
* 5. SUMMARY
* ACKNOWLEDGMENTS
* REFERENCES
* FIGURES
* TABLES
* REFERENCES TO THIS ARTICLE
FOOTNOTES
1 National Centre for Radio Astrophysics, TIFR, Pune University Campus,
Ganeshkhind, Pune-411007, India; vijay@ncra.tifr.res.in,
ramana@ncra.tifr.res.in, crs@ncra.tifr.res.in.
2 Institute for Geophysics and Planetary Physics, LLNL, P.O. Box 808,
L-413, Livermore, CA 94551; wil@sunlight.llnl.gov.
3 The Observatories of the Carnegie Institution of Washington, 813
Santa Barbara Street, Pasadena, CA 91101; pmc2@ociw.edu.