Unveiling the high energy tail of 1E 1740.7-2942 with INTEGRAL

Details Unveiling the high energy tail of 1E 1740.7-2942 with INTEGRAL Unveiling the high energy tail of 1E 1740.7-2942 with INTEGRAL

2008-11-20

arxiv.org/abs/0811.3381v1

Astrophys.J.693:1871-1876,2009

Astronomy and Astrophysics

Astrophysics

accepted in Astrophysical Journal Part 1; 3 figures

Scientific paper

10.1088/0004-637X/693/2/1871

The microquasar 1E 1740.7-2942 is observed with Integral since Spring 2003. Here, we report on the source high energy behaviour by using the first three years of data collected with SPI and IBIS telescopes, taking advantage of the instruments complementarity. Light curves analysis showed two main states for 1E 1740.7-2942: the canonical low/hard state of black-hole candidates and a ``dim'' state, characterised by a ~ 20 times fainter emission, detected only below 50 keV and when summing more than 1Ms of data. For the first time the continuum of the low/hard state has been measured up to ~ 600 keV with a spectrum that is well represented by a thermal Comptonization plus an additional component necessary to fit the data above 200 keV. This high energy component could be related to non-thermal processes as already observed in other black-hole candidates. Alternatively, we show that a model composed by two thermal Comptonizations provides an equally representative description of the data: the temperature of the first population of electrons results as (kTe)_1 ~ 30 keV while the second, (kTe)_2, is fixed at 100 keV. Finally, searching for 511 keV line showed no feature, either narrow or broad, transient or persistent.

Affiliated with

Also associated with

No associations

Rating

Unveiling the high energy tail of 1E 1740.7-2942 with INTEGRAL 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 Unveiling the high energy tail of 1E 1740.7-2942 with INTEGRAL, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Unveiling the high energy tail of 1E 1740.7-2942 with INTEGRAL will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-669381