Image Details

Choose export citation format:

X-Ray Insights into the Nature of Quasars with Redshifted Broad Absorption Lines

  • Authors: Ning-Xiao Zhang, W. N. Brandt, N. S. Ahmed, P. B. Hall, B. Luo, Scott F. Anderson, N. Filiz Ak, P. Petitjean, D. P. Schneider, Yue Shen, and R. Srianand

2017 The Astrophysical Journal 839 101.

  • Provider: AAS Journals

Caption: Figure 3.

Left panel: X-ray-to-optical power-law slope (﹩{\alpha }_{\mathrm{ox}}﹩) vs. monochromatic luminosity at rest-frame 2500 ﹩\mathring{\rm A} ﹩ (﹩{l}_{2500\mathring{\rm A} }﹩) for our RSBAL sample (red squares). The RSBAL sample of seven targets was observed by Chandra and two upper limits (represented by arrows) are shown for J0830+1654 and J1128+0113. Other samples in the figure are non-BALs from G08 sample B (improved following Wu et al. 2011), shown as black dots, and a combination of AGN samples from S06 and J07 is indicated by gray dots and downward arrows. The solid line represents the best-fit relation between ﹩{\alpha }_{\mathrm{ox}}﹩ and ﹩{l}_{2500\mathring{\rm A} }﹩ from Just et al. (2007); the dashed line (﹩{\rm{\Delta }}{\alpha }_{\mathrm{ox}}=-0.2﹩) separates X-ray normal and X-ray weak quasars. All seven of our targets are located in the X-ray weak region. Right panel: distribution of ﹩{\rm{\Delta }}{\alpha }_{\mathrm{ox}}﹩ for our RSBAL sample (shaded histograms) compared with the 132 non-BALs from G08 sample B. The two leftward red arrows are the upper limits of J0830+1654 and J1128+0113. The vertical dashed line indicates ﹩{\rm{\Delta }}{\alpha }_{\mathrm{ox}}=0﹩. All of our targets are in the X-ray-weak wing of the distribution, with six being significantly X-ray weaker than any of the G08 Sample B quasars.

Other Images in This Article
Copyright and Terms & Conditions

Additional terms of reuse