Abstract Details

Name: CHIRANJEEVI PALLERLA
Affiliation: OSMANIA UNIVERSITY
Conference ID: ASI2021_287
Title : Understanding the Inner Structure of Accretion disk in GX 17+2: AstroSat’s Outlook
Authors and Co-Authors : Chiranjeevi Pallerla (Department of Astronomy, Osmania University, Hyderabad, 50000) ,k. Sriram (Department of Astronomy, Osmania University, Hyderabad, 500007), s. malu (Department of Astronomy, Osmania University, Hyderabad, 50000), V. K. Agrawal(Space Astronomy Group, ISITE Campus, U R Rao Satellite Center, Bangalore, 560037).
Abstract Type : Poster
Abstract Category : Stars, ISM and Galaxy
Abstract : We report the timing and spectral studies of a Z source GX 17+2 observed from Astrosat LAXPC instrument.We have done Cross-Correlation function (CCF) study using soft (3-5 keV) and hard (16-40 keV) X -ray bands across the hardness intensity diagram (HID) and found correlated/anti-correlated hard and soft lags . We performed spectral analysis for few of these observations and found no consistent variation in the spectral parameters during the lags. We detected HBOs around ∼25 Hz and ∼ 33 Hz along with their harmonics using AstroSat LAXPC data. We suggest that the detected lags are readjustment time scales of corona close to the NS and constrained its height to be around a few ten to hundred kms. The detected lags and no significant variation of inner disk front across the HID strongly indicate that structural variation in corona is the most possible cause of Z track in HID.