2001A&A...369..450G

Query : 2001A&A...369..450G

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

Full paper

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Number of rows : 15

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag U	Mag B	Mag V	Mag R	Mag I	Sp type	#ref 1850 - 2024	#notes
1	LEDA 87392	Sy1	00 39 15.8339634552	-51 17 01.481641692		15.77	15.28	15.66		~	129	0
2	2MASS J01341690-4258262	Sy1	01 34 16.9072341600	-42 58 26.223391344		18.17	17.30	16.71		~	74	0
3	2MASS J01395577+0619225	Sy1	01 39 55.7697705024	+06 19 22.520805888		16.80	17.00			~	176	0
4	IC 3599	Sy1	12 37 41.1939398400	+26 42 27.484266888		15.7	16.5			~	176	0
5	RX J1242.6-1119	PaG	12 42 36.9	-11 19 35						~	44	1
6	LEDA 88835	Sy1	13 25 19.3805530608	-38 24 52.611680340		16.64	13.80	15.33	14.78	~	412	0
7	2MASS J14202436+5334117	BLL	14 20 24.3988020192	+53 34 11.158101156		20.49	20.03			~	36	0
8	2MASX J16245665+7554560	BLL	16 24 56.5716973728	+75 54 55.975695048			16.60			~	54	0
9	USNO-A2.0 0300-37578167	*	22 17 56.0650575384	-59 41 41.990364744		16.98	16.13			~	1	0
10	2MASS J22175666-5941309	Sy1	22 17 56.6565733944	-59 41 30.813696852	16.30	17.08	16.78	16.80		~	41	0
11	USNO-A2.0 0300-37578264	*	22 17 56.8941049512	-59 42 01.030325868		17.24	16.52			~	1	0
12	2MASS J22175818-5941095	*	22 17 58.0696731792	-59 41 09.689261100		18.64	17.65			~	1	0
13	RX J2217.9-5937	X	22 17 59.2408449120	-59 37 41.242126944		18.7				~	2	0
14	RX J2218.0-5939	X	22 18 03.2	-59 39 15						~	1	0
15	LEDA 90408	G	22 18 03.3	-59 40 49						~	7	0

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