Complex evolution of radio spectrum in GRO J1655-40

Astronomy and Astrophysics – Astronomy

Scientific paper

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Radio, Binaries, Black Holes, Transients

Scientific paper

The radio spectrum of the black hole X-ray binary GRO J1655-40 has undergone rapid changes over the past few days, according to observations by the Very Large Array (VLA). On Mar. 4th, data taken between 12:09 and 12:41 UT give flux densities of 1.2 +/- 0.2, 1.9 +/- 0.1, and 1.5 +/- 0.1 mJy at 1.425, 4.860, and 8.460 GHz, respectively; on Mar. 6th, observations between 12:16 and 12:56 UT yield values of 1.8 +/- 0.2, 1.3 +/- 0.1, and 1.2 +/- 0.1 mJy at the same frequencies.

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