Sub-milliJansky Flashes in the Radio Sky

Details Sub-milliJansky Flashes in the Radio Sky Sub-milliJansky Flashes in the Radio Sky

Sep 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006head....9.1849b&link_type=abstract

American Astronomical Society, HEAD meeting #9, #18.49; Bulletin of the American Astronomical Society, Vol. 38, p.389

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Scientific paper

We report the results of a 944-epoch survey for
transient sources with archival data from the Very Large
Array spanning 22 years with a typical epoch separation
of 7 days. Observations were obtained at 5 or 8.4 GHz
and achieved a typical detection threshold at the beam center of
250 microJansky per epoch. Eight transient sources were detected, each
in only a single epoch. Two transient sources were detected in two month averages. Future snapshot surveys
for transients will detect $1.5 \pm 0.4$ transient per square degrees above
a flux density of 370 microJansky.
One transient is located $\sim 3$ kpc in projection from the nucleus of
a spiral galaxy at a redshift $z=0.04$. Based on the
duration of the transient, its luminosity $L \sim 2 \times 10^{38}$
ergs s$^{-1}$, and its location in the galaxy we suggest
that the transient may be similar to the peculiar Type Ib/c supernova SN 1998BW.
Two other transient
sources are possibly associated with the outer parts of
faint optically-detected galaxies.
The remaining four transients
have no counterparts in the optical or infrared and show no faint persistent
radio flux. Known source classes of transient
including radio supernovae, gamma-ray burst afterglows, active galactic
nuclei, and stellar flares do not provide good fits to the observed parameters
of these transients. The hosts and progenitors of these transients
are unknown.

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