X-ray properties of the microquasar GRS 1915+105 during a variability class transition

Details X-ray properties of the microquasar GRS 1915+105 during a variability class transition X-ray properties of the microquasar GRS 1915+105 during a variability class transition

2001-10-28

arxiv.org/abs/astro-ph/0110589v1

Mon.Not.Roy.Astron.Soc. 330 (2002) 487

Astronomy and Astrophysics

Astrophysics

10 pages with 9 figures, LaTex. To be appeared in MNRAS

Scientific paper

10.1046/j.1365-8711.2002.05077.x

We present a detailed X-ray study of the microquasar GRS 1915+105 during a variability class transition observed in 2000 June with the PPCs of the Indian X-ray Astronomy Experiment. We supplement this observation with data from the RXTE archives. The source made a transition from a steady low-hard state to a regular oscillatory behaviour in the light curve known as bursts or class `rho' (Belloni et al. 2000) between 2000 May 11 and 17 and reverted back to the low-hard state on 2000 June 27. A gradual change in the burst recurrence time from about 75 s to about 40 s was observed which then increased to about 120 s during the ~ 40 days of class `rho'. The regular bursts disappeared from the X-ray light curves and the class transition was observed to occur within 1.5 hours on 2000 June 27 with the PPCs. A correlation is found between the observed QPO frequency at 5-8 Hz in the quiescent phase and the average X-ray intensity of the source during the class `rho'. We notice a strong similarity between the properties of the source during the class `rho' and those during the oscillatory phase of the observations of class `alpha'. From the timing and spectral analysis, it is found that the observed properties of the source over tens of days during the class `rho' are identical to those over a time scale of a few hundreds of seconds in the class `alpha'. Examining the light curves from the beginning of the RXTE/PCA and RXTE/ASM observations, it is found that the change of state from radio-quiet low-hard state to high state occurs through the X-ray classes `rho' and `alpha' which appear together during the state transition. It is further inferred that the source switches from low-hard state to the class `rho' through the intermediate class `alpha'.

Affiliated with

Also associated with

No associations

Rating

X-ray properties of the microquasar GRS 1915+105 during a variability class transition does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with X-ray properties of the microquasar GRS 1915+105 during a variability class transition, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and X-ray properties of the microquasar GRS 1915+105 during a variability class transition will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-270551