2011A&A...535L...1B


Query : 2011A&A...535L...1B

2011A&A...535L...1B - Astronomy and Astrophysics, volume 535, L1-1 (2011/11-1)

IGR J17361-4441: a possible new accreting X-ray binary in NGC 6388.

BOZZO E., FERRIGNO C., STEVENS J., BELLONI T.M., RODRIGUEZ J., DEN HARTOG P.R., PAPITTO A., KREYKENBOHM I., FONTANI F. and GIBAUD L.

Abstract (from CDS):

IGRJ17361-4441 is a newly discovered INTEGRAL hard X-ray transient, located in the globular cluster NGC 6388. We report here the results of the X-ray and radio observations performed with Swift, INTEGRAL, RXTE, and the Australia Telescope Compact Array (ATCA) after the discovery of the source on 2011 August 11. In the X-ray domain, IGRJ17361-4441 showed virtually constant flux and spectral parameters up to 18 days from the onset of the outburst. The broad-band (0.5-100keV) spectrum of the source could be reasonably well described by using an absorbed power-law component with a high energy cut-off (NH≃0.8x1022cm–2, Γ≃0.7-1.0, and Ecut≃25keV) and displayed some evidence of a soft component below ∼2keV. No coherent timing features were found in the RXTE data. The ATCA observation did not detect significant radio emission from IGRJ17361-4441, and provided the most stringent upper limit (rms 14.1µJy at 5.5GHz) to date on the presence of any radio source close to the NGC 6388 center of gravity. The improved position of IGRJ17361-4441 in outburst determined from a recent target of opportunity observation with Chandra, together with the X-ray flux and radio upper limits measured in the direction of the source, argue against its association with the putative intermediate-mass black hole residing in the globular cluster and with the general hypothesis that the INTEGRAL source is a black hole candidate. IGRJ17361-4441 might be more likely a new X-ray binary hosting an accreting neutron star. The ATCA radio non-detection also permits us to derive an upper limit to the mass of the suspected intermediate massive black hole in NGC 6388 of ≲600M. This is a factor of 2.5 lower than the limit reported previously.

Abstract Copyright:

Journal keyword(s): X-rays: binaries - X-rays: stars - X-rays: individual: IGRJ17361-4441

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 - 2022
#notes
1 NAME OAO 1657-41 HXB 17 00 48.884 -41 39 21.46           Ofpe/WN9 216 0
2 HD 153919 HXB 17 03 56.7728262865 -37 50 38.912077679 6.06 6.78 6.51 6.08 5.90 O6Iafcp 777 1
3 X Ara X-1 LXB 17 06 15.314 -43 02 08.69           ~ 246 1
4 4U 1705-44 LXB 17 08 54.470 -44 06 07.35           ~ 365 0
5 [KRL2007b] 228 LXB 17 12 35 -37 39.0     12.25     ~ 67 0
6 CXOGlb J173617.1-444407 CV* 17 36 17.188 -44 44 07.61           ~ 4 0
7 [CKC2010] 7 X 17 36 17.312 -44 44 07.10           ~ 4 0
8 CXOGlb J173617.3-444408 LXB 17 36 17.332 -44 44 08.36           ~ 4 0
9 IGR J17361-4441 gam 17 36 17.418 -44 44 05.98           ~ 26 0
10 NGC 6388 GlC 17 36 17.461 -44 44 08.34   7.40       ~ 842 1
11 V* V926 Sco LXB 17 38 58.3 -44 27 00 16.90 17.70 17.5     ~ 436 0

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2021.11.28-22:48:17

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