2004MNRAS.351.1063S


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.19CEST19:16:54

2004MNRAS.351.1063S - Mon. Not. R. Astron. Soc., 351, 1063-1070 (2004/July-1)

A dipping black hole X-ray binary candidate in NGC 55.

STOBBART A.-M., ROBERTS T.P. and WARWICK R.S.

Abstract (from CDS):

XMM-Newton European Photon Imaging Camera (EPIC) observations have revealed a bright point-like X-ray source in the nearby Magellanic-type galaxy NGC 55. At the distance of NGC 55, the maximum observed X-ray luminosity of the source, designated as XMMU J001528.9-391319, is Lx∼ 1.6 x1039 erg/s, placing the object in the ultraluminous X-ray source (ULX) regime. The X-ray light curve exhibits a variety of features including a significant upward drift over the 60 ks observation. Most notably a series of X-ray dips are apparent with individual dips lasting for typically 100-300 s. Some of these dips reach almost 100 per cent diminution of the source flux in the 2.0-4.5 keV band. The EPIC CCD spectra can be modelled with two spectral components, a very soft power-law continuum (Γ ~ 4) dominant below 2 keV, plus a multicolour disc (MCD) component with an inner-disc temperature kT ~ 0.8 keV. The observed upward drift in the X-ray flux can be attributed to an increase in the level of the MCD component, whilst the normalization of the power-law continuum remains unchanged. The dipping episodes correspond to a loss of signal from both spectral components, although the blocking factor is at least a factor 2 higher for the MCD component. XMMU J001528.9-391319 can be considered as a candidate black hole binary (BHB) system. A plausible explanation of the observed temporal and spectral behaviour is that we view the accretion disc close to edge-on and that, during dips, orbiting clumps of obscuring material enter our line of sight and cause significant blocking or scattering of the hard thermal X-rays emitted from the inner disc. In contrast, the more extended source of the soft power-law flux is only partially covered by the obscuring matter during the dips.

Abstract Copyright: 2004 RAS

Journal keyword(s): accretion, accretion discs - X-rays: binaries - X-rays: galaxies

Simbad objects: 22

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Number of rows : 22

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 NGC 55 GiG 00 14 53.602 -39 11 47.86 8.54 8.58 7.87 7.84   ~ 712 2
2 [BWE2015] NGC 55 119 ULX 00 15 28.89 -39 13 18.8           ~ 40 0
3 RX J0015.4-3913 PoG 00 15 29.18 -39 13 25.8           ~ 8 0
4 RX J004222.8+411536 XB* 00 42 22.919 +41 15 35.14           ~ 21 0
5 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 11049 1
6 NGC 253 SyG 00 47 33.134 -25 17 19.68   8.03   6.94 8.1 ~ 2954 2
7 NAME SGP reg 00 51 26.275 -27 07 41.70           ~ 517 0
8 NAME Scl Group GrG 01 00 06 -33 44.2           ~ 465 0
9 ChASeM33 J013350.89+303936.6 SNR 01 33 50.90 +30 39 36.6           ~ 87 1
10 M 33 GiG 01 33 50.904 +30 39 35.79 6.17 6.27 5.72     ~ 5190 1
11 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 14984 1
12 RX J0535.6-6651 HXB 05 35 40.9965654015 -66 51 53.522991468   13.7 13.8     B0.5IIIe 280 0
13 X LMC X-3 HXB 05 38 56.6325045489 -64 05 03.321118015   17 17.2     B2.5Ve 632 0
14 X LMC X-1 HXB 05 39 38.8285930597 -69 44 35.533031148   14.8 14.5     O8(f)p 564 2
15 V* UY Vol LXB 07 48 33.71 -67 45 07.7 16.10 17.00 16.9 16.7 17.05 ~ 575 0
16 V* IL Lup HXB 15 47 08.2766679321 -47 40 10.284971214           ~ 418 1
17 V* V381 Nor HXB 15 50 58.6520652623 -56 28 35.309070422   17.95 16.6     K3III 1035 0
18 V* V1033 Sco HXB 16 54 00.137 -39 50 44.90   15.20 14.2 16.14   F5IV 1719 1
19 V* V821 Ara HXB 17 02 49.3810714542 -48 47 23.163091737 16.20 16.30 15.5     ~ 1783 0
20 Granat 1915+105 LXB 19 15 11.54938 +10 56 44.7585           ~ 2309 0
21 HD 226868 HXB 19 58 21.6758193269 +35 12 05.782512305 9.38 9.72 8.91 8.42   O9.7Iabpvar 3947 0
22 NAME Local Group GrG ~ ~           ~ 7067 0

    Equat.    Gal    SGal    Ecl

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2020.10.19-19:16:54

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