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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
The nearest GHz peaked-spectrum radio galaxy, PKS 1718-649
Astronomical Journal, Volume 113, No. 6, Year 1997
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Description
In this paper we identify PKS 1718-649, at a distance of 56 Mpc (z=0.014; H0=75 km s-1 Mpc-1, q0=O), as the nearest GHz peaked-spectrum (GPS) radio galaxy, more than four times closer than any previously known. Extensive observations at radio wavelengths with the Australia Telescope Compact Array, the Southern Hemisphere VLBI Experiment array, and the Swedish-ESO Submillimetre Telescope have allowed us to determine the properties of the radio source: PKS 1718-649 consists of two compact sub-pc-scale components separated by approximately 2 pc, the overall radio polarization is low, and the radio spectrum is peaked near 3 GHz. Order-of-magnitude agreement between the quantitative model for GPS sources of Bicknell et al. [ApJ (1997) (in press)] and the radio data we present, as well as data at optical wavelengths from the literature, raises the interesting possibility that PKS 1718-649 may be frustrated in its development by the nuclear environment of its host galaxy, NGC 6328. The model of Bicknell et al. (1997) suggests free-free absorption as an explanation of the PKS 1718-649 radio spectrum. However, both free-free absorption and synchrotron self-absorption mechanisms are plausible for this source and both may contribute to the overall radio spectrum. PKS 1718-649 provides evidence to strengthen the speculative suggestion that GPS sources arise as a consequence of galaxy merger activity. © 1997 American Astronomical Society.
Authors & Co-Authors
Tingay, Steven John
United States, Pasadena
Jet Propulsion Laboratory
Jauncey, David L.
Australia, Sydney
Australia Telescope National Facility
Reynolds, John E.
Australia, Sydney
Australia Telescope National Facility
Tzioumis, Anastasios K.
Australia, Sydney
Australia Telescope National Facility
King, Edward A.
Australia, Sydney
Australia Telescope National Facility
Preston, Robert A.
United States, Pasadena
California Institute of Technology
Lovell, James E.J.
Australia, Hobart
University of Tasmania
Japan, Sagamihara
Jaxa Institute of Space and Astronautical Science
McCulloch, Peter M.
Australia, Hobart
University of Tasmania
Costa, Marco E.
Australia, Hobart
University of Tasmania
Nicolson, George D.
South Africa, Krugersdorp
Hartebeesthoek Radio Astronomy Observatory
Koekemoer, Anton M.
France, Paris
Institut D’astrophysique de Paris
United States, Baltimore
Space Telescope Science Institute
Tornikoski, Merja
Finland, Espoo
Aalto University
Kedziora-Chudczer, Lucyna L.
United States, Pasadena
Jet Propulsion Laboratory
Campbell-Wilson, Duncan
United States, Pasadena
Jet Propulsion Laboratory
Statistics
Citations: 35
Authors: 14
Affiliations: 9
Identifiers
Doi:
10.1086/118414
ISSN:
00046256
Research Areas
Cancer
Study Approach
Quantitative