Further radio observations of V4641 Sgr (= SAX J1819.3-2525)

Details Further radio observations of V4641 Sgr (= SAX J1819.3-2525) Further radio observations of V4641 Sgr (= SAX J1819.3-2525)

Aug 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003atel..175....1r&link_type=abstract

The Astronomer's Telegram, #175

Astronomy and Astrophysics

Astronomy

2

Radio, Request For Observations, Binaries, Black Holes, Transients, Variables

Scientific paper

We report further radio observations of the X-ray transient and likely black hole binary V4641 Sgr (ATEL #170, #171, #172, #173, #174). Observations with the Very Large Array (VLA) August 8 and 9, 2003 gave flux densities of 4.08+/-0.08 and 3.07+/-0.11 mJy, respectively, at 4.86 GHz; and 2.84+/-0.05 and 2.16+/-0.09 mJy at 8.46 GHz. The corresponding spectral index on both days is about -0.6, indicating optically-thin synchrotron emission.

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