The correlations between optical/UV broad lines and X-ray emission for a large sample of quasars

Autor: Timlin, J. D., Brandt, W. N., Ni, Q., Luo, B., Pu, Xingting, Schneider, D. P., Vivek, M., Yi, W.
Rok vydání: 2019
Předmět:
Druh dokumentu: Working Paper
DOI: 10.1093/mnras/stz3433
Popis: We present Chandra observations of 2106 radio-quiet quasars in the redshift range 1.799.99% level) between $\alpha_{ox}$ and these emission-line parameters, as well as between $\Delta\alpha_{ox}$ and CIV EW. Slight correlations are found between $\Delta\alpha_{ox}$ and CIV blueshift, MgII EW, and the CIV EW to MgII EW ratio. The best-fit trend in each parameter space is used to compare the X-ray weakness ($\Delta\alpha_{ox}$) and optical/UV emission properties of typical quasars and weak-line quasars (WLQs). The WLQs typically exhibit weaker X-ray emission than predicted by the typical quasar relationships. The best-fit relationships for our typical quasars are consistent with predictions from the disk-wind quasar model. The behavior of the WLQs compared to our typical quasars can be explained by an X-ray "shielding" model.
Comment: 24 pages, 16 Figures
Databáze: arXiv
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