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

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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 - 2022
#notes
1 LEDA 87392 Sy1 00 39 15.8339634552 -51 17 01.481641692   15.77 15.28 15.66   ~ 125 0
2 2MASS J01341690-4258262 Sy1 01 34 16.9072341600 -42 58 26.223391344   18.17 17.30 16.71   ~ 69 0
3 2MASS J01395577+0619225 Sy1 01 39 55.7697705024 +06 19 22.520805888   16.80 17.00     ~ 165 0
4 IC 3599 Sy1 12 37 41.1939398400 +26 42 27.484266888   15.7 16.5     ~ 164 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   ~ 382 0
7 2MASS J14202436+5334117 BLL 14 20 24.3988020192 +53 34 11.158101156   20.49 20.03     ~ 34 0
8 2MASX J16245665+7554560 BLL 16 24 56.5716973728 +75 54 55.975695048     16.60     ~ 52 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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2022.08.16-06:32:43

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