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A VLA study of 24 short term radio variables

University of British Columbia

Flux density variability information, on a time scale of days, has been extracted [2] for a number of radio sources, from the GB6 [1] catalog data. Twenty four sources, including some with NVSS counterparts, exhibiting significant short term variability, and with no current identification in either the NED or SIMBAD external databases, were selected for a Very Large Array B configuration study. VLA snapshots were taken at two epochs, separated by approximately a month, at two frequency bands, to elucidate variations in flux density, source structure and spectral index. The imaged sample of twenty four sources include well resolved sources with one-sided or two-sided structure, partially resolved sources, and some unresolved sources. Of the partially resolved and unresolved sources, a number are confirmed as being variable in flux density and spectral index. In particular, the partially resolved sources J1700+685, J2115+367, and J2145+187 exhibit short term structural variation, suggesting these sources are galactic. The unresolved sources J0251+562, J0502+346, and J0611+723 exhibit significant flux variability. APS results indicate that the unresolved source J0856+717 is stellar.

Thesis/Dissertation

application/pdf

2009-03-26

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http://hdl.handle.net/2429/6581

Physics

University of British Columbia

UBCV

DSpace