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Astron. Astrophys. 345, 49-58 (1999)


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Strong optical line variability in Mkn 110 *

K. Bischoff and W. Kollatschny

Universitäts-Sternwarte Göttingen, Geismarlandstraße 11, D-37083 Göttingen, Germany

Received 2 November 1998 / Accepted 12 February 1999

Abstract

We present results of a long-term variability campaign on the Seyfert 1 galaxy Markarian 110. Mkn 110 is a narrow-line Seyfert 1 object hosted in a morphological peculiar galaxy. We monitored the optical continuum and the line intensities as well as their profiles over a time interval of nearly ten years. The continuum and the Balmer lines varied by a factor of 2 to 5 within two years. The HeII[FORMULA]4686 line showed exceptional intensity variations of a factor of eight. We detected an additional independent very broad-line region in high intensity stages of the Balmer and HeII lines. The CCF analysis of the HeII line indicates that this very broad-line region originates at a distance of 9 light days only from the central ionizing source.

Key words: galaxies: individual: Mkn 110 – galaxies: Seyfert – line: profiles

* Based on observations collected at the German-Spanish Astronomical Centre, Calar Alto, operated by the Max-Planck-Institute for Astronomy, Heidelberg, jointly with the Spanish National Commission for Astronomy.

Send offprint requests to: W. Kollatschny

Correspondence to: kbischo@gwdg.de

© European Southern Observatory (ESO) 1999

Online publication: April 12, 1999

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