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

journal contribution
posted on 2023-05-16, 12:41 authored by Tingay, SJ, Jauncey, DL, Reynolds, JE, Tzioumis, AK, King, EA, Preston, RA, Murphy, DW, Meier, DL, Edwards, PG, James LovellJames Lovell, Hirabayashi, H, Kobayashi, H, Shibata, KM, Peter McCullochPeter McCulloch, Costa, ME, Dewdney, P, Cannon, W, Nicolson, G, Valtaoja, E, Tornikoski, M, Venturi, T
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.

History

Publication title

Advances in Space Research

Volume

26

Issue

4

Pagination

677-680

ISSN

0273-1177

Department/School

School of Natural Sciences

Publisher

Elsevier Science BV

Place of publication

Amsterdam

Repository Status

  • Restricted

Socio-economic Objectives

Expanding knowledge in the physical sciences

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