Query : 2002A&A...388..293S

2002A&A...388..293S - Astronomy and Astrophysics, volume 388, 293-297 (2002/6-2)

The broad band X-ray spectrum of the black hole candidate GRS 1758-258.


Abstract (from CDS):

We present the results of a BeppoSAX observation of the black hole candidate GRS 1758-258 carried out in 1997, while the source was in its low/hard state. The X-ray spectrum, simultaneously observed over the broad energy range from 0.1 to 200keV, can be well described by a Comptonized emission model with electron temperature kTe=31.4+3.4–2.5keV and optical depth τ=4.0+0.2–0.3 (spherical geometry), although a cut-off power-law and a reflection model cannot be excluded. Additionally, a broad iron line at 6.4keV with equivalent width EW=67+80–40eV has been marginally detected. The 0.1-200keV luminosity is 1.4x1037erg/s for an assumed distance of 8kpc. The soft and hard luminosities are such that the source falls inside the so-called ``burster box". No evidence for a soft excess is present.

Abstract Copyright:

Journal keyword(s): accretion, accretion disks - stars: individual: GRS 1758-258 - X-rays: general

Simbad objects: 3

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Number of rows : 3
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
1 NAME Galactic Center gam 17 45 39.60213 -29 00 22.0000           ~ 12321 0
2 4U 1758-25 LXB 18 01 09.7308941918 -25 04 44.128444504     11.08     ~ 624 1
3 2XMM J180112.4-254436 LXB 18 01 12.40 -25 44 36.1           ~ 368 1

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