The complex behaviour of the microquasar GRS 1915+105 in the ρ class observed with BeppoSAX. III. The hard X-ray delay and limit cycle mapping
Abstract
Context. The microquasar GRS1915+105 was observed by BeppoSAX in October 2000 for about ten days while the source was in ρ mode, which is characterized by a quasi-regular type I bursting activity.
Aims: This paper presents a systematic analysis of the delay of the hard and soft X-ray emission at the burst peaks. The lag, also apparent from the comparison of the [1.7-3.4] keV light curves with those in the [6.8-10.2] keV range, is evaluated and studied as a function of time, spectral parameters, and flux.
Methods: We apply the limit cycle mapping technique, using as independent variables the count rate and the mean photon rate. The results using this technique were also cross-checked using a more standard approach with the cross-correlation methods. Data are organized in runs, each relative to a continuous observation interval.
Results: The detected hard-soft delay changes in the course of the pointing from ~3 s to ~10 s and presents a clear correlation with the baseline count rate.
- Publication:
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Astronomy and Astrophysics
- Pub Date:
- August 2013
- DOI:
- arXiv:
- arXiv:1306.1628
- Bibcode:
- 2013A&A...556A..84M
- Keywords:
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- binaries: close;
- stars: individual: GRS 1915+105;
- X-rays: stars;
- Astrophysics - High Energy Astrophysical Phenomena
- E-Print:
- accepted for publication in A&