Abstract Details
| Name: KALYANI BAGRI Affiliation: pt. Ravishankar shukla university Conference ID: ASI2016_409 Title : A systematic analysis of the low/hard state RXTE spectra of GX 339-4 to constrain the geometry of the system Authors and Co-Authors : Ranjeev Misra (IUCAA),J.S.Yadav (TIFR),S.K.Pandey (PTRSU,Raipur) Abstract Type : Poster Abstract Category : Stars, The Milky Way Galaxy and its neighbours Abstract : One of the popular models for the low/hard state for Black Hole Binaries is that the standard accretion disk is truncated and the hot inner region produces via Comptonization, the hard X-ray flux. This is supported by the value of the high energy photon index which is often found to be small ~1.7 < 2, which implies that the hot medium is seed photons starved. On the other hand, the suggestive presence of a broad Iron line during the hard state would indicate that the accretion disk is not truncated but extends all the way to the inner most stable orbit. In such a case, it is a puzzle why the hot medium would remain photon starved. The broad Iron line should be accompanied by a broad smeared reflection bump at ~30 keV and it maybe that this additional component makes the spectrum hard and the intrinsic photon index is larger, i.e. > 2. This would mean that the medium is not photon deficient, reconciling the presence of a broad Iron line in the hard state. To test this hypothesis, we will analyze the RXTE observations of GX 339-4 during the 2002-2003 outburst and identify the observations when the system was in the hard state and showed a broad Iron line. We will then attempt to fit these observations with models which include smeared reflection to understand whether the intrinsic photon index can indeed be large. We will present the results of this analysis and other correlations between spectral parameters such as the flux, ionization level, Equivalent Width of the line, etc. |