Low Quiescent X-Ray and Radio Flux Levels from the Black Hole Transient V4641 Sgr

Details Low Quiescent X-Ray and Radio Flux Levels from the Black Hole Transient V4641 Sgr Low Quiescent X-Ray and Radio Flux Levels from the Black Hole Transient V4641 Sgr

Aug 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002atel..105....1t&link_type=abstract

The Astronomer's Telegram, #105

Astronomy and Astrophysics

Astronomy

5

Radio, X-Ray, Binaries, Black Holes, Transients

Scientific paper

Recent X-ray and radio observations of the dynamically confirmed black hole transient and relativistic radio jet source V4641 Sgr indicate that the source may be in a low quiescent state after its high level of activity in 2002 May and June (IAUCs 7906, 7908 and 7928). The source was not detected in the X-ray band during a 4.3 ks Chandra ACIS-S observation made on August 5.2 UT. Assuming a power-law energy spectrum with a photon index of 2 and interstellar absorption with a column density of N_H = 2e21 cm^-2 gives a 3-sigma upper limit on the absorbed 0.5-7 keV flux of 1.3e-14 erg cm^-2 s^-1 and a corresponding luminosity upper limit of 1.0e32 (d/7 kpc)^2 erg s^-1.

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