VLBA Snapshot Imaging Survey of Scintillating Sources
| dc.contributor.author | Ojha, Roopesh | |
| dc.contributor.author | Fey, Alan L. | |
| dc.contributor.author | Lovell, James E. J. | |
| dc.contributor.author | Jauncey, David L. | |
| dc.contributor.author | Johnston, Kenneth J. | |
| dc.date.accessioned | 2020-05-08T15:02:13Z | |
| dc.date.available | 2020-05-08T15:02:13Z | |
| dc.date.issued | 2004-10-01 | |
| dc.description.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. | en |
| dc.description.sponsorship | We thank Malte Marquarding for writing the AIPS++ scripts used to generate the final contour maps. This research has made use of the United States Naval Observatory Radio Reference Frame Image Database. The VLBA and VLA are facilities of the National Radio Astronomy Observatory, which is operated by Associated Universities, Inc., under a cooperative agreement with the National Science Foundation. | en |
| dc.description.uri | https://iopscience.iop.org/article/10.1086/423916 | en |
| dc.format.extent | 18 pages | en |
| dc.genre | journal articles | en |
| dc.identifier | doi:10.13016/m2gjfn-hcut | |
| dc.identifier.citation | Roopesh 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 | en |
| dc.identifier.uri | https://doi.org/10.1086%2F423916 | |
| dc.identifier.uri | http://hdl.handle.net/11603/18512 | |
| dc.identifier.uri | https://ned.ipac.caltech.edu/cgi-bin/objsearch?search_type=Search&refcode=2004AJ....128.1570O | |
| dc.identifier.uri | http://simbad.u-strasbg.fr/simbad/sim-ref?querymethod=bib&simbo=on&submit=submit+bibcode&bibcode=2004AJ....128.1570O | |
| dc.identifier.uri | http://vizier.u-strasbg.fr/viz-bin/VizieR?-source=J/AJ/128/1570 | |
| dc.language.iso | en | en |
| dc.publisher | IOP | en |
| dc.relation.isAvailableAt | The University of Maryland, Baltimore County (UMBC) | |
| dc.relation.ispartof | UMBC Physics Department Collection | |
| dc.relation.ispartof | UMBC Center for Space Sciences and Technology (CSST) / Center for Research and Exploration in Space Sciences & Technology II (CRSST II) | |
| dc.rights | Public Domain Mark 1.0 | * |
| dc.rights | This 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. | |
| dc.rights | 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 | |
| dc.rights.uri | http://creativecommons.org/publicdomain/mark/1.0/ | * |
| dc.title | VLBA Snapshot Imaging Survey of Scintillating Sources | en |
| dc.type | Text | en |