V4641 Sgr returns to quiescence; deep observations planned

Details V4641 Sgr returns to quiescence; deep observations planned V4641 Sgr returns to quiescence; deep observations planned

Aug 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004atel..315....1r&link_type=abstract

The Astronomer's Telegram, #315

Astronomy and Astrophysics

Astronomy

2

Radio, Infra-Red, Optical, X-Ray, Request For Observations, Black Holes, Transients, Variables

Scientific paper

Observations of the X-ray binary V4641 Sgr (e.g., ATEL #309, ATEL #303) with the Very Large Array (VLA) show that the object has returned to quiescence. Our last clear detection was on 20 July 2004, when the 4.86 GHz flux density remained steady at 2.0 +/- 0.2 mJy in two five-minute observations centered on 05:06 and 08:53 UT. Data taken at the same frequency on 23 July 2004 gave a nominal flux density at the position of the source of 0.27 +/- 0.09 mJy/beam, while 8.46 GHz observations on 23, 27, 28, 31 July, 1 August gave nominal flux densities of 0.09 +/- 0.05, 0.06 +/- 0.08, 0.05 +/- 0.04, 0.105 +/- 0.034, and 0.00 +/- 0.10 mJy/beam, respectively.

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