2020A&A...634A..58S


C.D.S. - SIMBAD4 rel 1.7 - 2020.12.03CET19:21:12

2020A&A...634A..58S - Astronomy and Astrophysics, volume 634A, 58-58 (2020/2-1)

Burst-induced coronal cooling in GS 1826-24. The clock wagging its tail.

SANCHEZ-FERNANDEZ C., KAJAVA J.J.E., POUTANEN J., KUULKERS E. and SULEIMANOV V.F.

Abstract (from CDS):

Type I X-ray bursts in GS 1826-24, and in several other systems, may induce cooling of the hot inner accretion flow that surrounds the bursting neutron star. Given that GS 1826-24 remained persistently in the hard state over the period 2003-2008 and presented regular bursting properties, we stacked the spectra of the X-ray bursts detected by INTEGRAL (JEM-X and ISGRI) and XMM-Newton (RGS) during that period to study the effect of the burst photons on the properties of the Comptonizing medium. The extended energy range provided by these instruments allows the simultaneous observation of the burst and persistent emission spectra. We detect an overall change in the shape of the persistent emission spectrum in response to the burst photon shower. For the first time, we observe simultaneously a drop in the hard X-ray emission, together with a soft X-ray excess with respect to the burst blackbody emission. The hard X-ray drop can be explained by burst-induced coronal cooling, while the bulk of the soft X-ray excess can be described by fitting the burst emission with an atmosphere model, instead of a simple blackbody model. Traditionally, the persistent emission was assumed to be invariant during X-ray bursts, and more recently to change only in normalization but not in spectral shape; the observed change in the persistent emission level during X-ray bursts may thus trigger the revision of existing neutron star mass-radius constraints, as the derived values rely on the assumption that the persistent emission does not change during X-ray bursts. The traditional burst fitting technique leads to up to a 10% overestimation of the bolometric burst flux in GS 1826-24, which significantly hampers the comparisons of the KEPLER and MESA model against this "textbook burster".

Abstract Copyright: © ESO 2020

Journal keyword(s): stars: neutron - dense matter - accretion, accretion disks - X-rays: binaries - X-rays: bursts

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 - 2021
#notes
1 V* UY Vol LXB 07 48 33.71 -67 45 07.7 16.10 17.00 16.9 16.7 17.05 ~ 578 0
2 V* QX Nor LXB 16 12 43.0 -52 25 23           ~ 838 1
3 V* V801 Ara LXB 16 40 55.5979962948 -53 45 04.953475039 17.50 18.20 17.5   17.07 ~ 792 1
4 X Ara X-1 LXB 17 06 15.314 -43 02 08.69           ~ 239 1
5 4U 1705-44 LXB 17 08 54.470 -44 06 07.35           ~ 359 0
6 NAME Slow Burster LXB 17 31 57.73 -33 50 02.5           ~ 766 1
7 KS 1731-260 LXB 17 34 13.46 -26 05 18.6       22.8 20.9 ~ 395 0
8 [KRL2007b] 277 LXB 17 47 18.06 -27 20 38.9           ~ 71 0
9 V* V4580 Sgr LXB 18 08 27.54 -36 58 44.3   16.81 16.51     ~ 883 0
10 V* V4634 Sgr LXB 18 29 28.2 -23 47 49 18.90 19.40 19     ~ 292 0
11 X Aql X-1 LXB 19 11 16.0572031521 +00 35 05.876658556           ~ 1020 1

    Equat.    Gal    SGal    Ecl

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2020.12.03-19:21:12

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