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EVIDENCE FOR PERIODICITY IN 43 YEAR-LONG MONITORING OF NGC 5548
Astrophysical Journal Supplement Series
We present an analysis of 43 years (1972 to 2015) of spectroscopic observations of the Seyfert 1 galaxy NGC 5548. This includes 12 years of new unpublished observations (2003 to 2015). We compiled about 1600 Hβ spectra and analyzed the long-term spectral variations of the 5100 Åcontinuum and the Hβ line. Our analysis is based on standard procedures including the Lomb-Scargle method, which is known to be rather limited to such heterogeneous data sets, and new method developed specifically fordoi:10.3847/0067-0049/225/2/29 fatcat:35gkajv22rf3flqvt5iotrbiqu