Time and spectral changes of GRS 1915+105 in the ρ class

Astronomy and Astrophysics – Astronomy

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Quasars, X-Ray Sources (Astronomical), Quasars, X-Ray Sources, X-Ray Bursts, X-Ray

Scientific paper

We report the results of the temporal and spectral analysis of the longest BeppoSAX pointing (about 770 ks) of the microquasar GRS 1915+105, performed in October 2000. The source was mainly observed in the variability class ρ characterized by series of sharp pulses with a typical recurrence time of about 50 s. This behaviour was generally stable but, occasionally, it changed to a more irregular state. A spectral analysis of the 1-100 keV emission showed a small but significant change of the disk temperature between the regular and irregular ρ-mode.

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