Measurement of the Broad-Line Region Size in Two Bright Quasars | Zendy

S. Kaspi | Zendy; Paul S. Smith | Zendy; Dan Maoz | Zendy; H. Netzer | Zendy; Buell T. Jannuzi | Zendy

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Measurement of the Broad-Line Region Size in Two Bright Quasars

Author(s) -

S. Kaspi,

Paul S. Smith,

Dan Maoz,

H. Netzer,

Buell T. Jannuzi

Publication year - 1996

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/310339

Subject(s) - quasar , astrophysics , physics , active galactic nucleus , galaxy , line (geometry) , emission spectrum , luminosity , lag , astronomy , spectral line , geometry , mathematics , computer network , computer science

We present 4 years of spectrophotometric monitoring data for two radio-quietquasars, PG 0804+762 and PG 0953+414, with typical sampling intervals ofseveral months. Both sources show continuum and emission line variations. Thevariations of the H$\beta$ line follow those of the continuum with a time lag,as derived from a cross-correlation analysis, of 93$\pm$30 days for PG 0804+762and 111$\pm$55 days for PG 0953+414. This is the first reliable measurement ofsuch a lag in active galactic nuclei with luminosity $L>10^{45}$ erg s$^{-1}$.The broad line region (BLR) size that is implied is almost an order ofmagnitude larger than that measured in several Seyfert 1 galaxies and isconsistent with the hypothesis that the BLR size grows as $L^{0.5}$.Comment: 5 pages, LaTeX (including aas2pp4 and epsf), including 4 EPS figures. Accepted for publication in Astrophysical Journal Letter

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