VLBA Snapshot Imaging Survey of Scintillating Sources
Links to Fileshttps://iopscience.iop.org/article/10.1086/423916
MetadataShow full item record
Type of Work18 pages
Citation of Original PublicationRoopesh Ojha, Alan L. Fey, James E. J. Lovell, David L. Jauncey, and Kenneth J. Johnston, VLBA Snapshot Imaging Survey of Scintillating Sources, The Astronomical Journal, Volume 128, Number 4, https://doi.org/10.1086%2F423916
RightsThis item is likely protected under Title 17 of the U.S. Copyright Law. Unless on a Creative Commons license, for uses protected by Copyright Law, contact the copyright holder or the author.
Public Domain Mark 1.0
This work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law
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.
The following license files are associated with this item:
- Creative Commons