NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-08-19 T01:37:15 PDT
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For refcode 1990ApJ...351...75M:
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Copyright by American Astronomical Society. Reproduced by permission
1990ApJ...351...75M HIGH-RATE SPECTROSCOPIC ACTIVE GALACTIC NUCLEUS MONITORING AT THE WISE OBSERVATORY. I. MARKARIAN 279 D. MAOZ, H. NETZER, E. LEIBOWITZ, N. BROSCH, A. LAOR, H. MENDELSON, S. BECK, E. ALMOZNINO, AND T. MAZEH School of Physics and Astronomy and the Wise Observatory, The Raymond and Beverly Sackler Faculty of Exact Sciences, Tel-Aviv University Received 1989 March 22; accepted 1989 August 18 ABSTRACT We monitored sprectrophotometrically a sample of AGNs, and achieved a temporal sampling rate of once every 3-4 days, over a period of 5-7 months. By observing each object simultaneously with a nearby field star, in a long-slit spectroscopy mode, we obtained accurate flux measurements even during bad weather and full moon. In this paper, the first in a series, we describe our observational technique and reduction procedure in general, and discuss our results for the Seyfert 1 galaxy Mrk 279. This object brightened by 20%-50% in H{alpha}, H{beta}, and the optical continuum during the period of observation. The high sampling rate and small error allow the determination, through cross-correlation, of the lag in the emission-line response to the continuum brightening. A lag of 12 days is observed. Using Monte Carlo simulations, we estimate the size of the broad- line region (BLR) to be 12 +/- 3 light days in this object and find that the results rule out, at the 95% significance level, a BLR of 21 light-days or larger. This result is in conflict with the "standard" photoionization model of AGNs, which predicts a BLR size larger by an order of magnitude. Subject headings: galaxies: individual (Mrk 279) - galaxies: photometry - galaxies: Seyfert - spectrophotometry
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