2003A&A...402..457P


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.01CET09:45:28

2003A&A...402..457P - Astronomy and Astrophysics, volume 402, 457-464 (2003/5-1)

RX J004717.4-251811: The first eclipsing X-ray binary outside the Local Group.

PIETSCH W., HABERL F. and VOGLER A.

Abstract (from CDS):

The X-ray source RX J004717.4-251811 in the nearby starburst galaxy NGC 253 was found to undergo changes from a low to a high state twice, during an XMM-Newton EPIC observation in December 2000 and also during a Chandra observation one year earlier. These transitions are interpreted as egresses from eclipses of a compact object in a high mass X-ray binary system (HMXB). The phase of eclipse egress during the Chandra observation is given by barycenter corrected MJD 51539.276±0.006 and the binary period determined to p=(352.870±0.012)d/n by the time difference between the two egresses and number n of periods in-between. Allowed periods may be further constrained by additional XMM-Newton, Chandra, ROSAT, and Einstein observations resulting in only seven acceptable periods with 1.47024 d and 3.20793 d most promising. No significant regular pulsations of the source in the range 0.3-1000s were found. Fluctuations on time scales of 1000 s were observed together with extended intervals of low intensity. The energy spectrum during the bright state can best be described by an absorbed flat power law (NH=1.9x1021.cm–2, Γ=1.7). In the bright state the source luminosity is 4x1038 (0.5-5keV), just compatible with the Eddington luminosity of a 1.4M neutron star. A possible optical identification is suggested. RX J004717.4-251811 parameters are compared to other eclipsing X-ray binaries (XRBs).

Abstract Copyright:

Journal keyword(s): galaxies: individual: NGC 253 - X-rays: stars - stars: binaries: eclipsing

Simbad objects: 11

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Number of rows : 11

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 [VV2006] J004647.5-252151 QSO 00 46 47.4662991699 -25 21 50.167981808     20.26     ~ 10 0
2 RX J004717.4-251827 X 00 47 17.44 -25 18 27.3           ~ 5 0
3 RX J004717.4-251811 X 00 47 17.75 -25 18 07.5           ~ 8 0
4 RX J004731.1-251503 X 00 47 31.18 -25 15 03.1           ~ 3 0
5 RX J004732.9-251748 ULX 00 47 32.97 -25 17 50.2           ~ 32 0
6 NGC 253 SyG 00 47 33.134 -25 17 19.68   8.03   6.94 8.1 ~ 2998 2
7 [VV2006] J004800.1-250954 QSO 00 48 00.2027849743 -25 09 53.245142353   20.04 18.53     ~ 10 0
8 SK 160 HXB 01 17 05.1447530244 -73 26 36.015353425 12.23 13.00 13.15   13.17 O9.7Ia+ 809 0
9 X LMC X-4 HXB 05 32 49.5558669817 -66 22 13.202534152   13.9 14.0     O8III 614 0
10 V* HZ Her LXB 16 57 49.8110797681 +35 20 32.487435684 11.90 14.89 13.63 13.88   B3/6ep 1945 0
11 NAME Local Group GrG ~ ~           ~ 7181 0

    Equat.    Gal    SGal    Ecl

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2021.03.01-09:45:28

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