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VLBA Snapshot Imaging Survey of Scintillating Sources

Citation

Ojha, R and Fey, AL and Lovell, JEJ and Jauncey, DL and Johnston, KJ, VLBA Snapshot Imaging Survey of Scintillating Sources, The Astronomical Journal, 128, (4) pp. 1570-1587. ISSN 0004-6256 (2004) [Refereed Article]

DOI: doi:10.1086/423916

Abstract

We present 8.4 GHz Very Long Baseline Array (VLBA) observations of 75 extragalactic radio sources drawn from the scintillating sources discovered in the Microarcsecond Scintillation-induced Variability survey. This survey clearly showed that the fraction of scintillating sources and the amplitude of their variability increases strongly with decreasing flux density, raising the possibility that scintillating sources may be systematically extremely core dominated. The observations presented here were designed to investigate this hypothesis. The results indeed show that most of the scintillating sources we observed with the VLBA have an extremely compact, core-dominated morphology, which has important implications for interpretations of the scintillation seen in these sources. In addition, these sources are potential candidates for inclusion in the International Celestial Reference Frame.

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)
ID Code:45338
Year Published:2004
Web of Science® Times Cited:6
Deposited By:Physics
Deposited On:2007-07-10
Last Modified:2007-07-10
Downloads:0

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