Recent radio evolution of GRO J1655-40

Details Recent radio evolution of GRO J1655-40 Recent radio evolution of GRO J1655-40

May 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005atel..489....1r&link_type=abstract

The Astronomer's Telegram, #489

Astronomy and Astrophysics

Astronomy

4

Radio, Binaries, Black Holes, Transients

Scientific paper

Very Large Array (VLA) observations of of the black-hole X-ray binary GRO J1655-40 show a slight increase in radio flux density corresponding to the recent change in X-ray and optical/IR state (ATEL #485, ATEL #486, ATEL #487). The following results were obtained at 4.86 GHz: 4may05 UT (MJD 53494.47): 3.1 +/- 0.1 mJy 7may05 UT (MJD 53497.40): 0.27 +/- 0.08 mJy/beam (marginal at best) 11may05 UT (MJD 53501.42): 0.67 +/- 0.15 mJy There are two surprises here: first, the relatively strong detection on May 4th, corresponding to the brief X-ray hardening seen between MJD 53493.6 and MJD 53495.2 in the PCA data (referenced in ATEL #487); and second, the comparitive faintness of the detection on May 11th, despite much more impressive X-ray activity (and hardening).

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