| Autor: |
Ha, Trung, Dix, Cooper, Matthews, Brandon M., Shemmer, Ohad, Brotherton, Michael S., Myers, Adam D., Richards, Gordon T., Maithil, Jaya, Anderson, Scott F., Brandt, W. N., Diamond-Stanic, Aleksandar M., Fan, Xiaohui, Gallagher, S. C., Green, Richard, Lira, Paulina, Luo, Bin, Netzer, Hagai, Plotkin, Richard M., Runnoe, Jessie C., Schneider, Donald P. |
| Předmět: |
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| Zdroj: |
Astrophysical Journal; 6/20/2023, Vol. 950 Issue 2, p1-12, 12p |
| Abstrakt: |
Weak emission-line quasars (WLQs) are a subset of type 1 quasars that exhibit extremely weak Ly α + N v λ 1240 and/or C iv λ 1549 emission lines. We investigate the relationship between emission-line properties and accretion rate for a sample of 230 "ordinary" type 1 quasars and 18 WLQs at z < 0.5 and 1.5 < z < 3.5 that have rest-frame ultraviolet and optical spectral measurements. We apply a correction to the H β -based black hole mass (M BH) estimates of these quasars using the strength of the optical Fe ii emission. We confirm previous findings that WLQs' M BH values are overestimated by up to an order of magnitude using the traditional broad-emission-line region size–luminosity relation. With this M BH correction, we find a significant correlation between H β -based Eddington luminosity ratios and a combination of the rest-frame C iv equivalent width and C iv blueshift with respect to the systemic redshift. This correlation holds for both ordinary quasars and WLQs, which suggests that the two-dimensional C iv parameter space can serve as an indicator of accretion rate in all type 1 quasars across a wide range of spectral properties. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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