Abstract Details

Name: Sapna Mishra
Affiliation: Aryabhatta Research Institute of Observational Sciences (ARIES)
Conference ID: ASI2020_417
Title : Study of BAL trough variabilities in radio-aligned and radio-unaligned BALQSOs
Authors and Co-Authors : Sapna Mishra, Dr. Hum Chand
Abstract Type : Poster
Abstract Category : Extragalactic Astronomy
Abstract : To study the relative role of the radio jets associated with the broad absorption line quasars (BALQSOs) in driving the strong outflows, it is important to probe for the BAL variation in the sample of polar BALQSOs (i.e. viewed along the direction of radio jets). Knowing the radio variability together with the high brightness temperature resulting from the inverse Compton catastrophe argument, the study of Zhou et al. 2006, ApJ, 639, 716 and Ghosh et al. 2007, ApJ, 661, L139 have provided a unique tool to isolate the polar BAL population among the BAL quasars. Based on the cross-correlation of SDSS-DR14 BAL quasars with the FIRST and NVSS catalogs, we have made a sample of 120 radio-detected BAL quasars with radio flux density > 1mJy having two epochs of radio observations. Our further analysis revealed that out of these 120 radio-detected BAL quasars, 54 have shown radio intensity variation at 3-sigma (i.e., radio variable, hereafter RV) and hence are potential candidates of polar BAL population while 66 have not shown radio variability (i.e., radio non-variable, hereafter RNV). Besides, we have assembled and analyzed the multi-epoch SDSS optical spectra of 54 RV and 66 RNV BALQSOs. Our multi-epoch optical analysis shows that the samples of RV and RNV BALQSOs are equivalent in all physical aspects suggesting an inefficient role of jets in driving the strong BAL outflows. We further aim to perform the structure-function analysis of optical light curves available in Catalina Real-Time Transient Survey of these samples to examine whether the continuum fluctuations in both the subclasses of radio-detected BAL quasar differ significantly or not which will be a crucial aspect of the variability study of the BALQSOs.