NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-05-20 T04:38:04 PDT
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For refcode 1991AJ....101..127W:
Retrieve 216 NED objects in this reference.
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1991AJ....101..127W RADIO CONTINUUM SOURCES IN NEARBY AND BRIGHT E/S0 GALAXIES: SAMPLE SELECTION AND WELL STUDIED CASES J. M. WROBEL National Radio Astronomy Observatory, P.O. Box O, Socorro, New Mexico 87801 and Astrophysics Research Center, Physics Department, New Mexico Institute of Mining and Technology, Socorro, New Mexico 87801 Received 27 August 1987; revised 12 July 1990 ABSTRACT A volume-limited sample of 216 nearby (V_Sun_ ,<= 3000 km s^1^) and optically bright (B <= 14 mag) E/S0 galaxies was drawn from the Center of Astrophysics redshift survey (Huchra et al. 1983; 1984 version). This volume-limited sample is ideally suited to systematic searches in all spectral domains for low power activity in E/S0 galaxies. As an aid to those embarking on such studies, the basic optical properties of the sample are tabulated. References to all available radio-continuum data on the 216 galaxies through 1989 August are given in an Appendix. These data show that twelve galaxies are confirmed radio sources for which VLA images are available. A synthesis of the radio properties of these twelve reveal that (1) all exhibit compact radio cores with powers ~10^21-23^ W Hz^-1^ and, usually, structure on parsec scales; (2) kpc-scale structures are common, and are usually collimated and two sided with respect to the compact core; and (3) galactic-scale emission, when present, usually appears as outer double lobes fed by twin jets. These radio structures can be understood within the context of the beam model of extragalactic radio sources. The compiled radio data also reveal that the vast majority of the remaining 204 galaxies in the volume-limited sample have powers less than or the order of 10^21-22^ W Hz ^-1^. A new VLA survey of these objects, reported in a companion paper, is designed (l) to image the galaxies already detected as radio sources but lacking VLA images; (2) to search the many as yet undetected galaxies for radio emission at a level more than ten times lower than previous searches; (3) to detect a compact radio core of power ~10^20^ W Hz^-1^ within any galaxy in the survey volume; and (4) to extend the radio luminosity function of radio sources in nearby and bright E/S0 galaxies to powers of ~10^19^ W Hz^-1^.
Retrieve 216 NED objects in this reference.
Please click here for ADS abstract

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