Other
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21924204a&link_type=abstract
American Astronomical Society, AAS Meeting #219, #242.04
Other
Scientific paper
We present results from the first search for radio transients in a nearby galaxy, M51 (NGC 5194). The search was conducted using archival data from the Very Large Array spanning a period of nearly 30 years. Most data were taken at a frequency of 4.9 GHz, with supplemental observations at other frequencies. Each epoch is 10-20 minutes in duration and epochs are irregularly spaced, making us sensitive to transients on a wide range of timescales. This image depth allows us to detect transients at the distance of M51 down to a luminosity of 10e25 erg/s/Hz. As our search includes data collected during the extensive monitoring of SN 1994I by Weiler et al. in the years following its discovery, we also present an independent analysis of a subset of radio observations of this important type Ic supernova. We find that the data is well-fit by a synchrotron self-absorption model and estimate a pre-explosion mass loss rate of 2-5 x 10e-5 solar masses per year, which is consistent with a Wolf-Rayet progenitor for the SN.
This work is supported in part by the NSF REU and DOD ASSURE programs under NSF grant no. 0754568 and by the Smithsonian Institution.
Alexander Kate
Chomiuk Laura
Soderberg Alicia Margarita
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