High-rate spectroscopic active galactic nucleus monitoring at the Wise Observatory. I - Markarian 279

Details High-rate spectroscopic active galactic nucleus monitoring at the Wise Observatory. I - Markarian 279 High-rate spectroscopic active galactic nucleus monitoring at the Wise Observatory. I - Markarian 279

Mar 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...351...75m&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 351, March 1, 1990, p. 75-82. Research supported by the U.S. - Israel Binat

Astronomy and Astrophysics

Astrophysics

62

Active Galactic Nuclei, Astronomical Spectroscopy, Markarian Galaxies, Seyfert Galaxies, Astronomical Photometry, Charge Coupled Devices, Light Curve, Photoionization

Scientific paper

Spectrophotometric monitoring of a sample of AGNs has 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, accurate flux measurements were obtained even during bad weather and full moon. Results for the Seyfert 1 galaxy MrK 279 are discussed. This object brightened by 20-50 percent 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. The size of the broadline region (BLR) is estimated to be 12 + or - 3 light days in this object; the results rule out, at the 95 percent 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.

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