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Astron. Astrophys. 350, L31-L34 (1999)

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Letter to the Editor

RX J1624.9+7554: a new X-ray transient AGN

D. Grupe *  1, H.-C. Thomas 2 and K.M. Leighly 3

1 MPI für Extraterrestrische Physik, Giessenbachstrasse, 85748 Garching, Germany
2 MPI für Astrophysik, Karl-Schwarzschild-Strasse 1, 85748 Garching, Germany
3 Columbia Astrophysics Laboratory, 538 West 120th St., New York, NY 10027, USA

Received 4 August 1999 / Accepted 7 September 1999


We report the discovery of a new X-ray transient AGN, RX J1624.9+7554. This object appeared to be bright in the ROSAT All-Sky Survey, but had turned off in two pointed observations about one and a half years later. The optical identification spectrum shows a non-emission line spectrum of a spiral galaxy at z=0.064. We will discuss several hypotheses that can explain the peculiar behaviour of this object.

Key words: accretion, accretion disks – galaxies: active – galaxies: nuclei – galaxies: individual: RX J1624.9+7554

* Guest Observer, McDonald Observatory, University of Texas at Austin

Send offprint requests to: D. Grupe (dgrupe@xray.mpe.mpg.de)

© European Southern Observatory (ESO) 1999

Online publication: October 4, 1999