2001A&A...378..800O


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.13CEST22:51:33

2001A&A...378..800O - Astronomy and Astrophysics, volume 378, 800-805 (2001/11-2)

The central region of M 31 observed with XMM-Newton. II. Variability of the individual sources.

OSBORNE J.P., BOROZDIN K.N., TRUDOLYUBOV S.P., PRIEDHORSKY W.C., SORIA R., SHIREY R., HAYTER C., LA PALOMBARA N., MASON K., MOLENDI S., PAERELS F., PIETSCH W., READ A.M., TIENGO A., WATSON M.G. and WEST R.G.

Abstract (from CDS):

We present the results of a study of the variability of X-ray sources in the central 30' of the nearby Andromeda Galaxy (M 31) based on XMM-Newton Performance Verification observations. Two observations of this field, with a total exposure time of about 50 ks, were performed in June and December of 2000. We found 116 sources brighter than a limiting luminosity of 6x1035erg/s (0.3-12keV, d=760kpc). For the ∼60 brightest sources, we searched for periodic and non-periodic variability; at least 15% of these sources appear to be variable on a time scale of several months. We discovered a new bright transient source ∼2.9' from the nucleus in the June observation; this source faded significantly and was no longer detected in December. The behaviour of the object is similar to a handful of Galactic LMXB transients, most of which are supposed to harbor black holes. We detected pulsations with a period of ∼865s from a source with a supersoft spectrum. The flux of this source decreased significantly between the two XMM observations. The detected period is unusually short and points to a rapidly spinning magnetized white dwarf. The high luminosity and transient nature of the source suggest its possible identification with classical or symbiotic nova, some of which were observed earlier as supersoft sources.

Abstract Copyright:

Journal keyword(s): galaxies: individual: M 31 - galaxies: spiral - galaxies: general - X-rays: galaxies

Nomenclature: Table 2: [OBT2001] NN (Nos 1-10)>, [OBT2001] XR JHHMMSS.s+DDMMSS N=2.

Simbad objects: 14

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Number of rows : 14

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 [BGP2014] 71 XB? 00 42 05.770 +41 13 30.43           ~ 9 0
2 2MASS J00421215+4117588 GlC 00 42 12.15 +41 17 58.8   19.090 17.69 16.740 15.800 ~ 39 0
3 RX J0042.2+4118 XB? 00 42 12.284 +41 18 37.45   13.423 12.847 12.510 12.296 ~ 14 0
4 2MASS J00423442+4118106 No* 00 42 34.43 +41 18 10.6           ~ 12 1
5 2XMM J004242.1+411607 XB* 00 42 42.17 +41 16 08.3           ~ 15 0
6 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 10905 1
7 2MASS J00424684+4116146 AG? 00 42 46.84 +41 16 14.7           ~ 10 0
8 [HPH2013] 195 XB? 00 42 47.35 +41 11 57.9           ~ 6 0
9 [FRS2006] WeCAPP V17309 XB? 00 42 56.914 +41 18 44.37           ~ 8 0
10 RX J004318.6+412024 CV* 00 43 18.851 +41 20 18.52           ~ 23 0
11 NAME M31PSS CV* 00 43 19.59 +41 17 56.9           ~ 22 0
12 [O2006] SNR 5 SNR 00 43 27.871 +41 18 29.83           ~ 33 0
13 V* V2293 Oph LXB 17 19 36.930 -25 01 03.43   17.55 16.65     ~ 144 0
14 RX J1914.4+2456 XB* 19 14 26.09 +24 56 44.6           ~ 121 0

    Equat.    Gal    SGal    Ecl

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2020.07.13-22:51:33

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