2006ApJ...636..971C


Query : 2006ApJ...636..971C

2006ApJ...636..971C - Astrophys. J., 636, 971-978 (2006/January-2)

On the origin of black hole X-ray emission in quiescence: Chandra observations of XTE J1550-564 and H1743-322.

CORBEL S., TOMSICK J.A. and KAARET P.

Abstract (from CDS):

We report the results of observations of the black hole binaries XTE J1550-564 and H1743-322 in their quiescent state using the Chandra X-Ray Observatory. Both sources are detected at their faintest level of X-ray emission ever observed with a 0.5-10 keV unabsorbed luminosity of 2x1032 (d/5 kpc)2 ergs/s for XTE J1550-564 and 9x1031 (d/8 kpc)2 ergs/s for H1743-322. These luminosities are in the upper range compared to the faintest levels observed in other black hole systems, possibly related to residual accretion for these sources with frequent outbursts. For XTE J1550-564, the Chandra observations also constrain the X-ray spectrum, as a fit with an absorbed power-law model yields a photon index of 2.25±0.08, clearly indicating a softening of the X-ray spectrum at lower luminosities compared to the standard hard state. Similar softening at low luminosity is seen for several black hole transients with orbital periods less than 60 hr. Most of the current models of accreting black holes are able to reproduce such softening in quiescence. In contrast, we find that systems with orbital periods longer than 60 hr appear to have hard spectra in quiescence, and their behavior may be consistent with hardening in quiescence.

Abstract Copyright:

Journal keyword(s): Accretion, Accretion Disks - Black Hole Physics - Stars: Individual: Alphanumeric: H1743-322 - Stars: Individual: Alphanumeric: XTE J1550-564 - X-Rays: Binaries

Simbad objects: 16

goto Full paper

goto View the references in ADS

Number of rows : 16
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 1A 0620-00 HXB 06 22 44.5423857312 -00 20 44.290460544 10.60 11.40 11.2     K3V-K7V 1073 0
2 V* KV UMa HXB 11 18 10.7930420496 +48 02 12.314730120     12.25     K5V-M1V 768 0
3 V* GU Mus HXB 11 26 26.5961559600 -68 40 32.877752952           K3V-K7V 691 1
4 V* IL Lup HXB 15 47 08.2768672752 -47 40 10.284587760     11.96     ~ 453 1
5 V* V381 Nor HXB 15 50 58.6637920704 -56 28 35.258385000   17.95 16.6     K3III 1103 0
6 [GHJ2008] 3 HXB 16 50 00.980 -49 57 43.60     11.89     K4V 370 0
7 V* V1033 Sco HXB 16 54 00.137 -39 50 44.90   15.20 14.2 16.14   F5IV 1799 1
8 V* V821 Ara HXB 17 02 49.3876391280 -48 47 23.087954544 16.20 16.30 15.5     ~ 1950 0
9 NAME Sgr A* X 17 45 40.03599 -29 00 28.1699           ~ 3954 3
10 NAME XTE J17464-3213 LXB 17 46 15.59637 -32 14 00.8600           ~ 675 0
11 AX J1748.0-2829 LXB 17 48 05.060 -28 28 25.80     13.60     ~ 179 0
12 V* V4641 Sgr HXB 18 19 21.6343259256 -25 24 25.849595952     13.654   13.092 B9III 436 1
13 [KRL2007b] 353 HXB 19 08 53.080 +09 23 04.84     15.80     ~ 101 0
14 Granat 1915+105 HXB 19 15 11.55576 +10 56 44.9052           ~ 2463 0
15 V* V404 Cyg HXB 20 24 03.8254458776 +33 52 01.962185735           G9/K0III/V 1189 0
16 NAME Galactic Bulge reg ~ ~           ~ 3930 0

To bookmark this query, right click on this link: simbad:objects in 2006ApJ...636..971C and select 'bookmark this link' or equivalent in the popup menu


2022.10.03-00:48:17

© Université de Strasbourg/CNRS

    • Contact