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Space VLBI Observations of Southern Hemisphere Gamma-Ray and Non-Gamma-Ray AGN: First Results for PKS 0637-752

Citation

Tingay, SJ and Jauncey, DL and Reynolds, JE and Tzioumis, AK and King, EA and Preston, RA and Murphy, DW and Meier, DL and Edwards, PG and Lovell, JEJ and Hirabayashi, H and Kobayashi, H and Shibata, KM and McCulloch, PM and Costa, ME and Dewdney, P and Cannon, W and Nicolson, G and Valtaoja, E and Tornikoski, M and Venturi, T, Space VLBI Observations of Southern Hemisphere Gamma-Ray and Non-Gamma-Ray AGN: First Results for PKS 0637-752, Advances in Space Research, 26, (4) pp. 677-680. ISSN 0273-1177 (2000) [Refereed Article]

DOI: doi:10.1016/S0273-1177(99)01189-8

Abstract

We present the first results from our VSOP proposal, "γ-ray loud and quiet AGN with VSOP and SHEVE at 5 GHz". This project is aimed at determining what, if anything, differentiates γ-ray-identified radio sources from similar strong, flat-spectrum radio sources which have not been identified as sources of greater than 100 MeV γ-rays. Five VSOP observations have been successfully completed as part of this project during VSOP AO1. One observation has been correlated thus far, a 4.970 GHz observation of PKS 0637-752 from 1997 November 21. We present the VSOP image for PKS 0637-752 and make comparisons between the space VLBI image and ground-based VLBI and Australia Telescope Compact Array (ATCA) images, as well as present ATCA flux density monitoring at 4.8 GHz. A brightness temperature for PKS 0637-752 of 0.7×10 12 K has been determined from the VSOP data and a tentative apparent superluminal speed, from comparison to the ground-based VLBI image, of ∼9c. © 2000 COSPAR. Published by Elsevier Science Ltd.

Item Details

Item Type:Refereed Article
Research Division:Physical Sciences
Research Group:Astronomical and Space Sciences
Research Field:Galactic Astronomy
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Physical Sciences
Author:Lovell, JEJ (Dr Jim Lovell)
Author:McCulloch, PM (Professor Peter McCulloch)
Author:Costa, ME (Dr Marco Costa)
ID Code:20949
Year Published:2000
Web of Science® Times Cited:4
Deposited By:Physics
Deposited On:2000-08-01
Last Modified:2007-09-12
Downloads:0

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