Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-10-11
Astronomy and Astrophysics
Astrophysics
The 6th INTEGRAL Workshop 2006. The 6th INTEGRAL Workshop 2006, submitted
Scientific paper
\integral and \sax observations of the neutron-star LMXB 4U~1705--44 have been analysed to deeply investigate the spectral state transitions nature. Its energy spectrum can be described as the sum of one or two blackbody, a 6.4-keV Fe line and a component due to thermal Comptonization. For the first time in this source, we find a strong signature of Compton reflection, presumably due to illumination of the optically-thick accretion disk by the Comptonized spectrum. Detection of two blackbody component in the soft states could originate in the disk and the neutron-star surface, and the Comptonized component arises from a hot inner flow with the seed photons coming from the disk and/or the neutron-star surface. The spectral transitions are shown to be associated with variations in the accretion rate, which changes in turn the temperature of the Comptonizing electrons and the strength of Compton reflection.
Bazzano Angela
Federici Memmo
Fiocchi Mariateresa
Ubertini Pietro
No associations
LandOfFree
Spectral analysis of the Low-Mass X-ray Binary 4U~1705--44 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 Spectral analysis of the Low-Mass X-ray Binary 4U~1705--44, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Spectral analysis of the Low-Mass X-ray Binary 4U~1705--44 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-578238