2012A&A...543A..50D


C.D.S. - SIMBAD4 rel 1.7 - 2019.07.18CEST16:07:46

2012A&A...543A..50D - Astronomy and Astrophysics, volume 543A, 50-50 (2012/7-1)

XMM-Newton observations of GX 13+1: correlation between photoionised absorption and broad line emission.

DIAZ TRIGO M., SIDOLI L., BOIRIN L. and PARMAR A.N.

Abstract (from CDS):

We analysed data from five XMM-Newton observations of GX13+1 to investigate the variability of the photo-ionised absorber in this source. We fitted EPIC and RGS spectra obtained from the ``least-variable'' intervals with a model consisting of disc-blackbody and blackbody components together with a Gaussian emission feature at ∼6.55-6.7keV modified by absorption due to cold and photo-ionised material. We found a significant correlation between the hard, ∼6-10keV, flux, the ionisation and column density of the absorber and the equivalent width of the broad iron line. We interpret the correlation in a scenario in which a disc wind is thermally driven at large, ∼1010cm, radii and the broad line results from reprocessed emission in the wind and/or hot atmosphere. The breadth of the emission line is naturally explained by a combination of scattering, recombination and fluorescence processes. We attribute the variations in the absorption and emission along the orbital period to the view of different parts of the wind, possibly located at slightly different inclination angles. We constrain the inclination of GX13+1 to be between 60 and 80° from the strong absorption in the line of sight, which obscures up to 80% of the total emission in one observation, and the absence of eclipses. We conclude that either a disc wind and/or a hot atmosphere can explain the current observations of narrow absorption and broad iron emission features in neutron star low-mass X-ray binaries as a class.

Abstract Copyright:

Journal keyword(s): X-rays: binaries - accretion, accretion disks - X-rays: individual: GX13+1

Simbad objects: 9

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Number of rows : 9

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 V* GR Mus LXB 12 57 37.153 -69 17 18.98   19.40 19.1     ~ 238 0
2 4U 1323-62 LXB 13 26 36.31 -62 08 09.9           ~ 160 0
3 NAME Big Dipper LXB 16 28 05.5318316228 -49 12 40.011030945           ~ 205 0
4 V* HZ Her LXB 16 57 49.8110797681 +35 20 32.487435684 11.90 14.89 13.63 13.88   B3/6ep 1894 0
5 V* V2134 Oph LXB 17 02 06.54 -29 56 44.1 18.35 18.75 18.3     ~ 315 0
6 4U 1705-44 LXB 17 08 54.470 -44 06 07.35           ~ 346 0
7 IGR J17480-2446 LXB 17 48 04.831 -24 46 48.87           ~ 140 0
8 V* V5512 Sgr LXB 18 14 31.55 -17 09 26.7           K5III 343 0
9 Granat 1915+105 LXB 19 15 11.54938 +10 56 44.7585           ~ 2214 0

    Equat.    Gal    SGal    Ecl

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2019.07.18-16:07:46

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