Continuum and emission-line variability of the Seyfert galaxy Arakelian 120 - Analysis of a large database

Details Continuum and emission-line variability of the Seyfert galaxy Arakelian 120 - Analysis of a large database Continuum and emission-line variability of the Seyfert galaxy Arakelian 120 - Analysis of a large database

Aug 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989aj.....98..500p&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 98, Aug. 1989, p. 500-512.

Astronomy and Astrophysics

Astronomy

22

Astronomical Spectroscopy, Seyfert Galaxies, Continuous Spectra, Data Bases, Emission Spectra, Light Curve, Line Spectra, Statistical Analysis

Scientific paper

New spectrophotometric observations are combined with observations from earlier papers to construct a homogeneous data base of 107 optical continuum measurements and 75 H-beta flux measurements of the Seyfert 1 galaxy Akn 120. Statistical analysis of these data reveals that: (1) the individual measurements are apparently accurate to better than about 10 percent; (2) there is no reliable evidence for real continuum or emission-line variations on timescales shorter than about 20 days; and (3) there is substantial evidence for real variations in both the line and the continuum on timescales in the range of about 20-40 days. Indeed, large-amplitude (nearly a factor of 2) emission-line changes have been detected on several occasions over intervals shorter than two months. The correlation between the continuum and emission-line changes is consistent with the earlier claim that the broad-line region is quite small in this galaxy.

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