Radio Reappearance of V4641 Sgr

Details Radio Reappearance of V4641 Sgr Radio Reappearance of V4641 Sgr

Jul 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004atel..296....1r&link_type=abstract

The Astronomer's Telegram, #296

Astronomy and Astrophysics

Astronomy

4

Radio, Infra-Red, Optical, X-Ray, Binaries, Black Holes, Transients, Variables, Stars

Scientific paper

Very Large Array (VLA) observations of the black hole candidate binary V4641 Sgr, currently active at optical wavelengths (see VSNet), reveal an on-going radio outburst. Data taken on 5 July 2004 from 07:47 to 09:32 UT gave clear detections of an optically thin, steep spectrum source (flux density going as frequency to the -0.7 power): 1.425 GHz: 12.50 +/- 1.22 mJy/beam 4.860 GHz: 6.56 +/- 0.31 mJy/beam 8.460 GHz: 4.45 +/- 0.09 mJy/beam 14.940 GHz: 2.09 +/- 0.18 mJy/beam 22.460 GHz: 1.96 +/- 0.16 mJy/beam 43.399 GHz: 1.23 +/- 0.31 mJy/beam There is no indication of any spatial extension to the source, although the limits are rather poor since the VLA is currently in its most compact (D) configuration.

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