2013MNRAS.433.1023G

Query : 2013MNRAS.433.1023G

2013MNRAS.433.1023G - Mon. Not. R. Astron. Soc., 433, 1023-1038 (2013/August-1)

A long-term X-ray monitoring of the ultraluminous X-ray source NGC 5408 X-1 with Swift reveals the presence of dips but no orbital period.

GRISE F., KAARET P., CORBEL S., CSEH D. and FENG H.

Abstract (from CDS):

NGC 5408 X-1 is a well-studied ultraluminous X-ray source (ULX) that has been seen to emit in X-rays persistently above the Eddington limit of a stellar mass black hole for years. In this paper we report on the most extensive X-ray monitoring of a ULX, using more than 4 yr of observations from the Swift satellite. We find that the 115 d periodicity reported by Strohmayer disappeared after only a few cycles, confirming the suspicion of Foster et al. that the periodicity is most likely superorbital and not the orbital period of the system. We also report on a clear dipping behaviour of the source that may be related to a (super)orbital phenomenon. All these features are reminiscent of Galactic X-ray binaries and strengthen their link with ULXs. Deeper observations of a dip could help resolve the ambiguity about the interpretation of the spectral components of ULXs.

Abstract Copyright: © 2013 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2013)

Journal keyword(s): accretion, accretion discs - X-rays: binaries - X-rays: individual: NGC 5408 X-1

Simbad objects: 18

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Number of rows : 18
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 NGC 55 rG 00 14 53.602 -39 11 47.86 8.54 8.58 7.87 7.84   ~ 828 2
2 [BWE2015] NGC 55 119 ULX 00 15 28.89 -39 13 18.8           ~ 73 0
3 [FWB2009] HLX-1 ULX 01 10 28.30 -46 04 22.3     24.5 23.80   ~ 230 1
4 CXOU J095546.5+694040 HXB 09 55 46.45 +69 40 40.3           ~ 17 1
5 2CXO J095550.1+694046 HXB 09 55 50.12 +69 40 46.4           ~ 294 1
6 M 82 AGN 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 6156 6
7 M 105 LIN 10 47 49.600 +12 34 53.87   10.56 9.76 9.12 8.18 ~ 1504 0
8 [SGT2004] J104750.00+123456.9 X 10 47 50.00 +12 34 56.9           ~ 8 0
9 V* GR Mus LXB 12 57 37.1833002949 -69 17 18.996899563   19.40 19.1     ~ 275 0
10 RX J133001+47137 UX? 13 30 01.01 +47 13 43.9           ~ 108 0
11 [FK2005] 25 ULX 14 03 19.63 -41 22 58.7           ~ 252 0
12 NGC 5408 EmG 14 03 20.907 -41 22 39.75   12.59   11.96 12.2 ~ 368 3
13 X Nor X-1 LXB 16 34 01.610 -47 23 34.80           ~ 579 0
14 V* V1033 Sco HXB 16 54 00.1423963019 -39 50 44.761701340       16.14   F3-6IV 1980 0
15 V* HZ Her LXB 16 57 49.8110126616 +35 20 32.486555472 11.90 14.89 13.63 13.88   B3/6ep 2172 0
16 MAXI J1659-152 LXB 16 59 01.680 -15 15 28.73           ~ 274 0
17 SS 433 HXB 19 11 49.5647697480 +04 58 57.827127648   16.854 14.643     A7Ib 2253 4
18 HD 226868 HXB 19 58 21.6757355952 +35 12 05.784512688 9.38 9.72 8.91 8.42   O9.7Iabpvar 4590 0

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