2005A&A...443..599P


C.D.S. - SIMBAD4 rel 1.7 - 2019.12.11CET15:37:10

2005A&A...443..599P - Astronomy and Astrophysics, volume 443, 599-608 (2005/11-4)

Resolving the hard X-ray emission of GX 5-1 with INTEGRAL.

PAIZIS A., EBISAWA K., TIKKANEN T., RODRIGUEZ J., CHENEVEZ J., KUULKERS E., VILHU O. and COURVOISIER T.J.-L.

Abstract (from CDS):

We present the study of one year of INTEGRAL data on the neutron star low mass X-ray binary GX 5-1. Thanks to the excellent angular resolution and sensitivity of INTEGRAL, we are able to obtain a high quality spectrum of GX 5-1 from ∼5keV to ∼100keV, for the first time without contamination from the nearby black hole candidate GRS 1758-258 above 20keV. During our observations, GX 5-1 was mostly found in the horizontal and normal branch of its hardness intensity diagram. A clear hard X-ray emission is observed above ∼30keV which exceeds the exponential cut-off spectrum expected from lower energies. This spectral flattening may have the same origin of the hard components observed in other Z sources as it shares the property of being characteristic to the horizontal branch. The hard excess is explained by introducing Compton up-scattering of soft photons from the neutron star surface due to a thin hot plasma expected in the boundary layer. The spectral changes of GX 5-1 downward along the ``Z'' pattern in the hardness intensity diagram can be well described in terms of monotonical decrease of the neutron star surface temperature. This may be a consequence of the gradual expansion of the boundary layer as the mass accretion rate increases.

Abstract Copyright:

Journal keyword(s): X-rays: binaries - binaries (including multiple): close - stars: neutron - stars: individual: GX 5-1

Simbad objects: 12

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Number of rows : 12

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 V* V818 Sco LXB 16 19 55.0688745859 -15 38 25.019920749 11.60 12.40 11.1     Oev 1515 0
2 4U 1642-45 LXB 16 45 47.7 -45 36 40           ~ 376 1
3 V* V1101 Sco LXB 17 05 44.4915929414 -36 25 23.049863107   20.10 18.6     ~ 402 0
4 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 11083 0
5 X Sgr X-1 LXB 17 47 56.0 -26 33 49           ~ 342 0
6 [KRL2007b] 297 LXB 17 59 45.7 -22 01 39           ~ 58 1
7 4U 1758-25 LXB 18 01 09.7308941918 -25 04 44.128444504           ~ 609 1
8 2XMM J180112.4-254436 LXB 18 01 12.40 -25 44 36.1           ~ 358 1
9 X Sgr X-3 LXB 18 01 32.3 -20 31 44           ~ 217 1
10 V* NP Ser LXB 18 16 01.389 -14 02 10.62   18.8       K 595 2
11 V* V1341 Cyg WV* 21 44 41.1544523872 +38 19 17.065856122 15.00 15.20 14.7     A9III 1060 0
12 NAME Galactic Bulge reg ~ ~           ~ 3261 0

    Equat.    Gal    SGal    Ecl

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2019.12.11-15:37:10

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