2013ApJ...773...59P


C.D.S. - SIMBAD4 rel 1.7 - 2021.04.19CEST15:43:15

2013ApJ...773...59P - Astrophys. J., 773, 59 (2013/August-2)

The X-ray spectral evolution of galactic black hole X-ray binaries toward quiescence.

PLOTKIN R.M., GALLO E. and JONKER P.G.

Abstract (from CDS):

Most transient black hole X-ray binaries (BHXBs) spend the bulk of their time in a quiescent state, where they accrete matter from their companion star at highly sub-Eddington luminosities (we define quiescence here as a normalized Eddington ratio lx= L_0.5-10 keV/LEdd_< 10–5). Here, we present Chandra X-ray imaging spectroscopy for three BHXB systems (H 1743-322, MAXI J1659-152, and XTE J1752-223) as they fade into quiescence following an outburst. Multiple X-ray observations were taken within one month of each other, allowing us to track each individual system's X-ray spectral evolution during its decay. We compare these three systems to other BHXB systems. We confirm that quiescent BHXBs have softer X-ray spectra than low-hard-state BHXBs, and that quiescent BHXB spectral properties show no dependence on the binary system's orbital parameters. However, the observed anti-correlation between X-ray photon index (Γ) and lx in the low-hard state does not continue once a BHXB enters quiescence. Instead, Γ plateaus to an average < Γ > = 2.08±0.07 by the time lx reaches ∼10–5. lx∼ 10–5 is thus an observationally motivated upper limit for the beginning of the quiescent spectral state. Our results are discussed in the context of different accretion flow models and across the black hole mass scale.

Abstract Copyright:

Journal keyword(s): accretion, accretion disks - black hole physics - X-rays: binaries

Simbad objects: 12

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Number of rows : 12

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 1A 0620-00 HXB 06 22 44.5420315454 -00 20 44.289428950 10.60 11.40 11.2     K3V-K7V 1052 0
2 V* KV UMa HXB 11 18 10.7922353051 +48 02 12.319175505     12.25     K5V-M1V 737 0
3 V* V381 Nor HXB 15 50 58.6520652623 -56 28 35.309070422   17.95 16.6     K3III 1062 0
4 [GHJ2008] 3 HXB 16 50 00.980 -49 57 43.60     11.89     K4V 358 0
5 V* V1033 Sco HXB 16 54 00.137 -39 50 44.90   15.20 14.2 16.14   F5IV 1751 1
6 MAXI J1659-152 LXB 16 59 01.680 -15 15 28.73           ~ 199 0
7 V* V821 Ara HXB 17 02 49.3810714542 -48 47 23.163091737 16.20 16.30 15.5     ~ 1826 0
8 NAME XTE J17464-3213 LXB 17 46 15.59637 -32 14 00.8600           ~ 631 0
9 XTE J1752-223 LXB 17 52 15.090 -22 20 32.36           ~ 168 0
10 V* V4641 Sgr HXB 18 19 21.6342721789 -25 24 25.849323550     13.654   13.092 B9III 407 1
11 [KRL2007b] 353 HXB 19 08 53.080 +09 23 04.84     15.80     ~ 88 0
12 V* V404 Cyg HXB 20 24 03.820 +33 52 01.90 14.50 14.20 12.7     K0IV 1125 0

    Equat.    Gal    SGal    Ecl

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2021.04.19-15:43:15

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