Measurement of the Broad Line Region Size in Two Bright Quasars

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

1996-08-29

arxiv.org/abs/astro-ph/9608195v1

Astrophys.J. 471 (1996) L75

Astronomy and Astrophysics

Astrophysics

5 pages, LaTeX (including aas2pp4 and epsf), including 4 EPS figures. Accepted for publication in Astrophysical Journal Letter

Scientific paper

10.1086/310339

We present 4 years of spectrophotometric monitoring data for two radio-quiet quasars, PG 0804+762 and PG 0953+414, with typical sampling intervals of several months. Both sources show continuum and emission line variations. The variations of the H$\beta$ line follow those of the continuum with a time lag, as derived from a cross-correlation analysis, of 93$\pm$30 days for PG 0804+762 and 111$\pm$55 days for PG 0953+414. This is the first reliable measurement of such 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 of magnitude larger than that measured in several Seyfert 1 galaxies and is consistent with the hypothesis that the BLR size grows as $L^{0.5}$.

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