Interpretation of Departure from the Broad-line Region Scaling in Active Galactic Nuclei

被引：23

作者：

Czerny, Bozena ^{[1
]}

Wang, Jian-Min ^{[2
]}

Du, Pu ^{[2
]}

Hryniewicz, Krzysztof ^{[3
]}

Karas, Vladimir ^{[4
]}

Li, Yan-Rong ^{[2
]}

Panda, Swayamtrupta ^{[1
,5
]}

Sniegowska, Marzena ^{[1
,6
]}

Wady, Conor ^{[1
]}

Yuan, Ye-Fei ^{[7
]}

机构：

[1] Polish Acad Sci, Ctr Theoret Phys, Al Lotnikow 32-46, PL-02668 Warsaw, Poland

[2] Chinese Acad Sci, Inst High Energy Phys, Key Lab Particle Astrophys, 19B Yuquan Rd, Beijing 100049, Peoples R China

[3] Polish Acad Sci, Nicolaus Copernicus Astron Ctr, Ul Bartycka 18, PL-00716 Warsaw, Poland

[4] Acad Sci, Astron Inst, Bocni 2, CZ-14131 Prague, Czech Republic

[5] Nicolaus Copernicus Astron Ctr PAN, Ul Bartycka 18, PL-00716 Warsaw, Poland

[6] Univ Warsaw Observ, Al Ujazdowskie 4, PL-88478 Warsaw, Poland

[7] Univ Sci & Technol China, Astron Dept, Hefei 230026, Anhui, Peoples R China

来源：

ASTROPHYSICAL JOURNAL | 2019年 / 870卷 / 02期

关键词：

accretion; accretion disks; galaxies: active; galaxies: Seyfert; quasars: emission lines; ADVECTION-DOMINATED ACCRETION; BLACK-HOLE; DISK EVAPORATION; CENTRAL MASSES; INNER DISK; AGN; CONSTRAINTS; ORIGIN; TRANSITION; EVOLUTION;

D O I：

10.3847/1538-4357/aaf396

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Most results of the reverberation monitoring of active galaxies showed a universal scaling of the time delay of the H beta emission region with the monochromatic flux at 5100 angstrom, with very small dispersion. Such a scaling favored the dust-based formation mechanism of the broad-line region (BLR). Recent reverberation measurements showed that actually a significant fraction of objects exhibit shorter lags than the previously found scaling. Here we demonstrate that these shorter lags can be explained by the old concept of scaling of the BLR size with the ionization parameter. Assuming a universal value of this parameter and a universal value of the cloud density reproduces the distribution of observational points in the time delay-monochromatic flux plane, provided that a range of black hole spins is allowed. However, a confirmation of the new measurements for low/moderate Eddington ratio sources is strongly needed before the dust-based origin of the BLR can be excluded.

引用

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