MICROLENSING OF QUASAR BROAD EMISSION LINES: CONSTRAINTS ON BROAD LINE REGION SIZE

被引：67

作者：

Guerras, E. ^{[1
,2
]}

Mediavilla, E. ^{[1
,2
]}

Jimenez-Vicente, J. ^{[3
,4
]}

Kochanek, C. S. ^{[5
,6
]}

Munoz, J. A. ^{[7
]}

Falco, E. ^{[8
]}

Motta, V. ^{[9
]}

机构：

[1] Inst Astrofis Canarias, E-38200 Tenerife, Spain

[2] Univ La Laguna, Dept Astrofis, E-38200 Tenerife, Spain

[3] Univ Granada, Dept Fis Teor & Cosmos, E-18071 Granada, Spain

[4] Univ Granada, Inst Carlos I Fis Teor & Comp, E-18071 Granada, Spain

[5] Ohio State Univ, Dept Astron, Columbus, OH 43221 USA

[6] Ohio State Univ, Ctr Cosmol & Astroparticle Phys, McPherson Lab 4055, Columbus, OH 43221 USA

[7] Univ Valencia, Dept Astron & Astrofis, E-46100 Valencia, Spain

[8] Ctr Astrophys, Cambridge, MA 02138 USA

[9] Univ Valparaiso, Dept Fis & Astron, Valparaiso, Chile

来源：

ASTROPHYSICAL JOURNAL | 2013年 / 764卷 / 02期

基金：

美国国家科学基金会;

关键词：

gravitational lensing: micro; quasars: emission lines; ACTIVE GALACTIC NUCLEI; BLACK-HOLE MASSES; GRAVITATIONALLY LENSED QUASARS; DARK-MATTER SUBSTRUCTURE; HIGH-REDSHIFT QUASARS; DIGITAL SKY SURVEY; SPECTRAL VARIABILITY; DOUBLE QSO; ARP; 151; REVERBERATION;

D O I：

10.1088/0004-637X/764/2/160

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We measure the differential microlensing of the broad emission lines between 18 quasar image pairs in 16 gravitational lenses. We find that the broad emission lines are in general weakly microlensed. The results show, at a modest level of confidence (1.8 sigma), that high ionization lines such as C IV are more strongly microlensed than low ionization lines such as H beta, indicating that the high ionization line emission regions are more compact. If we statistically model the distribution of microlensing magnifications, we obtain estimates for the broad line region size of r(s) = 24(-15)(+22) and r(s) = 55(-35)(+150) It-day (90% confidence) for the high and low ionization lines, respectively. When the samples are divided into higher and lower luminosity quasars, we find that the line emission regions of more luminous quasars are larger, with a slope consistent with the expected scaling from photoionization models. Our estimates also agree well with the results from local reveberation mapping studies.

引用

页数：9

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