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


C.D.S. - SIMBAD4 rel 1.7 - 2020.08.09CEST05:18:38

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 - 2020
#notes
1 3XMM J003915.8-511701 Sy1 00 39 15.8341273306 -51 17 01.480962252   15.77 15.28 15.66   ~ 120 0
2 6dFGS gJ013416.9-425826 Sy1 01 34 16.9070384920 -42 58 26.220856306   18.17 17.30 16.71   ~ 65 0
3 2XMM J013955.7+061922 Sy1 01 39 55.7698488494 +06 19 22.518916337   16.80 17.00     ~ 153 0
4 IC 3599 Sy1 12 37 41.1939866364 +26 42 27.492074834   15.7 16.5     ~ 155 0
5 RX J1242.6-1119 PaG 12 42 36.9 -11 19 35           ~ 42 1
6 2MASX J13251937-3824524 Sy1 13 25 19.3805503234 -38 24 52.611897329   16.64 13.80 15.33   ~ 340 0
7 2MASS J14202436+5334117 BLL 14 20 24.3985908313 +53 34 11.155674864   20.49 20.03     ~ 34 0
8 2MASS J16245659+7554560 BLL 16 24 56.5714665760 +75 54 55.978646466     16.60     ~ 51 0
9 USNO-A2.0 0300-37578167 * 22 17 56.0651199784 -59 41 41.990384433   16.98 16.13     ~ 1 0
10 6dFGS gJ221756.6-594130 Sy1 22 17 56.6561264472 -59 41 30.817920584 16.30 17.08 16.78 16.80   ~ 41 0
11 USNO-A2.0 0300-37578264 * 22 17 56.8941472281 -59 42 01.030618455   17.24 16.52     ~ 1 0
12 2MASS J22175818-5941095 * 22 17 58.19 -59 41 09.5   18.64 17.65     ~ 1 0
13 RX J2217.9-5937 X 22 17 59.2416585494 -59 37 41.231345342   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

    Equat.    Gal    SGal    Ecl

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2020.08.09-05:18:38

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