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Date and Time of the Query: 2019-06-18 T08:18:48 PDT
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For refcode 1996ApJ...471L..75K:
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Copyright by American Astronomical Society. Reproduced by permission
1996ApJ...471L..75K MEASUREMENT OF THE BROAD-LINE REGION SIZE IN TWO BRIGHT QUASARS SHAI KASPI, PAUL S. SMITH, DAN MAOZ, HAGAI NETZER, AND BUELL T. JANNUZI Received 1996 June 12; accepted 1996 August 29 ABSTRACT 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 +/- 30 days for PG 0804+762 and 111 +/- 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^ ergs 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^. Subject headings: galaxies: active - quasars: emission lines - quasars: individual (PG 0804+762, PG 0953+414)
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