2004A&A...416..699N


C.D.S. - SIMBAD4 rel 1.7 - 2019.12.06CET18:52:10

2004A&A...416..699N - Astronomy and Astrophysics, volume 416, 699-702 (2004/3-3)

Two spectral states of the transient X-ray burster SAX J1747.0-2853.

NATALUCCI L., BAZZANO A., COCCHI M., UBERTINI P., CORNELISSE R., HEISE J. and IN'T ZAND J.J.M.

Abstract (from CDS):

The neutron star binary SAX J1747.0-2853, located in the Galactic Center region at about 0.5° from Sgr A* and at a distance of ∼9kpc, has been observed in outburst four times (1998, 1999, 2000 and 2001) by BeppoSAX and RossiXTE. At the time of its discovery in 1998 the source was observed in a low/hard state, showing a hard tail with a high energy cutoff of ∼70keV. About two years later the source reappeared about one order of magnitude brighter in the X-rays (0.5-10keV) and with a significantly steeper spectrum. As was the case for the low state, the data could be fitted by an input model based on two continuum primary components: a) a soft thermal excess, which is ∼4 times more luminous than the one found in hard state; b) a non-thermal component which is compatible with either a power-law or a comptonization spectrum. The soft component is equally well described by pure blackbody or multi-color disk emission, with significantly higher temperature than observed in low state (∼1.3 vs. the ∼0.5keV assuming pure blackbody). For this model, the flux of the non-thermal component below ∼10keV is a significant fraction of the total X-ray flux, i.e. greater than ∼50% in the 2-10keV band.

Abstract Copyright:

Journal keyword(s): stars: binaries: close - stars: individual: SAX J1747.0-2853 - X-rays: bursts

Simbad objects: 4

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Number of rows : 4

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 NAME Great Annihilator LXB 17 43 54.83 -29 44 42.6           ~ 634 1
2 NAME Sgr A* X 17 45 40.03599 -29 00 28.1699           ~ 3291 3
3 2E 3944 LXB 17 46 21.09 -28 43 42.3           ~ 103 0
4 [KRL2007b] 275 LXB 17 47 02.60 -28 52 58.9           ~ 153 0

    Equat.    Gal    SGal    Ecl

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2019.12.06-18:52:10

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