USNO-A2.0 0300-37578264 , the SIMBAD biblio

2001A&A...369..450G - Astronomy and Astrophysics, volume 369, 450-458 (2001/4-2)

RX J2217.9-5941: A highly X-ray variable Narrow-Line Seyfert 1 galaxy.

GRUPE D., THOMAS H.-C. and LEIGHLY K.M.

Abstract (from CDS):

We report the discovery of a highly X-ray variable AGN, RX J2217.9-5941. This object was bright during the ROSAT All-Sky Survey (RASS), during which a decrease in the count rate by a factor of 12 was observed. It was found to be much fainter in follow-up HRI observations and is therefore an X-ray transient AGN candidate. On long time scales of years, its count rate decreased by a factor of about 30 between the RASS and the ROSAT HRI and ASCA observations in 1998. Analysis of the ASCA data, complicated by source confusion and poor statistics, tentatively indicates a steep spectrum in the faint state. There is no evidence for variability among 5 optical observations of the object obtained between 1992 and 1998. We discuss the variability of RX J2217.9-5941 and its possible X-ray transient nature.

Abstract Copyright:

Journal keyword(s): accretion, accretion disks - galaxies: active - galaxies: nuclei - galaxies: Seyfert - galaxies: individual (RX J2217.9-5941)

Nomenclature: Table 1: [GTL2001] N (Nos 1-4). Table 2: [GTL2001] A (Nos A-C).

Simbad objects: 15

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