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| 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
| 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 | ~ | 130 | 0 | ||
| 2 | 2MASS J01341690-4258262 | Sy1 | 01 34 16.9072341600 | -42 58 26.223391344 | 18.17 | 17.30 | 16.71 | ~ | 75 | 0 | ||
| 3 | 2MASS J01395577+0619225 | Sy1 | 01 39 55.7697705024 | +06 19 22.520805888 | 16.80 | 17.00 | ~ | 178 | 0 | |||
| 4 | IC 3599 | Sy1 | 12 37 41.1939398400 | +26 42 27.484266888 | 15.7 | 16.5 | ~ | 178 | 0 | |||
| 5 | RX J1242.6-1119 | PaG | 12 42 36.9 | -11 19 35 | ~ | 46 | 1 | |||||
| 6 | LEDA 88835 | Sy1 | 13 25 19.3805530608 | -38 24 52.611680340 | 16.64 | 13.80 | 15.33 | 14.78 | ~ | 418 | 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 | ~ | 55 | 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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