Strong spectral variability in NGC 7603 over 20 years

Details Strong spectral variability in NGC 7603 over 20 years Strong spectral variability in NGC 7603 over 20 years

Sep 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000a%26a...361..901k&link_type=abstract

Astronomy and Astrophysics, v.361, p.901-912 (2000)

Astronomy and Astrophysics

Astrophysics

16

Line: Profiles, Galaxies: Individual: Ngc 7603, Galaxies: Seyfert

Scientific paper

We present results of a long-term optical variability campaign on the Seyfert 1 galaxy NGC 7603 over a period of nearly 20 years. The optical continuum and the Balmer and Helium lines varied by a factor of 5 to 10 in this broad-line Seyfert 1 galaxy. Furthermore, it is remarkable that the optical FeII line blends varied with the same amplitude as the Hα and HeI lines. During the first half of the campaign (until 1990) there was a strong correlation between Balmer decrement variations, Hβ intensity variations and emission line asymmetry. This behaviour changed afterwards when the Hβ line intensity was higher than on average. Based on observations taken at the German-Spanish Astronomical Centre Calar Alto, ESO, and McDonald Observatory

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