| Autor: |
Timlin, J. D., Brandt, W. N., Ni, Q., Luo, B., Pu, Xingting, Schneider, D. P., Vivek, M., Yi, W. |
| Rok vydání: |
2019 |
| Předmět: |
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| 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 |
| Externí odkaz: |
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