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Astron. Astrophys. 329, L25-L28 (1998)

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Letter to the Editor

HS 1543+5921 - a bright z = 0.807 QSO in the center of the 'Seyfert' galaxy SBS 1543+593*

D. Reimers and H.-J. Hagen

Hamburger Sternwarte, Universität Hamburg, Gojenbergsweg 112, D-21029 Hamburg, Germany

Received 26 August 1997 / Accepted 9 October 1997


We show that the 'Seyfert' galaxy SBS 1543+593 is a by-chance projection of the center of a nearby galaxy ([FORMULA]) onto the bright QSO HS 1543+5921 ([FORMULA]). The quasar has been discovered independently by the Hamburg Quasar Survey, an automated survey for bright QSOs based on digitized objective prism Schmidt plates. Direct imaging and subsequent spectroscopy of a faint (R = 22m) HII region in the foreground galaxy allowed to measure the redshift of the galaxy which is a dwarf spiral or irregular galaxy (M [FORMULA]). The galaxy center is located less than 3" from the QSO. We briefly discuss a possible gravitational lensing effect.

Key words: Quasars: individual: HS 1543+5921 - Galaxies: individual: SBS 1543+593 - Cosmology: gravitational lensing

* Based on observations from the German-Spanish Astronomical Center, Calar Alto, operated by the Max-Planck-Institut für Astronomie, Heidelberg, jointly with the National Commission for Astronomy

Send offprint requests to: D. Reimers, dreimers@hs.uni-hamburg.de

© European Southern Observatory (ESO) 1998

Online publication: December 8, 1997