2006MNRAS.370..837G


C.D.S. - SIMBAD4 rel 1.7 - 2021.04.19CEST14:36:25

2006MNRAS.370..837G - Mon. Not. R. Astron. Soc., 370, 837-844 (2006/August-1)

X-ray spectral transitions of black holes from RXTE All-Sky Monitor.

GIERLINSKI M. and NEWTON J.

Abstract (from CDS):

We have analysed X-ray outbursts from several Galactic black hole (GBH) transients, as seen by the All-Sky Monitor (ASM) on board Rossi X-ray Timing Explorer (RXTE). We have used the best estimates of distance and black hole mass to find their luminosity (scaled to the Eddington limit), which allowed for direct comparison of many sources. We have found two distinct hard-to-soft state transitions in the initial part of the outburst. The distinction is made on the basis of the transition luminosity, its duration, the shape of the track in the hardness-luminosity diagram and evolution of the hardness ratio. The bright/slow transition occurs at ∼30 per cent of Eddington (estimated bolometric) luminosity and takes ≳30 d, during which the source quickly reaches the intermediate/very high state and then proceeds to the soft state at much slower pace. The dark/slow transition is less luminous (≲10 per cent of Eddington), shorter (≲15 d) and the source does not slow its transition rate before reaching the soft state. We speculate that the distinction is due to irradiation and evaporation of the disc, which sustains the Comptonizing corona in the bright intermediate/very high state.

Abstract Copyright: 2006 The Authors. Journal compilation © 2006 RAS

Journal keyword(s): accretion, accretion discs - instabilities - X-rays: binaries

Simbad objects: 13

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Number of rows : 13

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* GU Mus HXB 11 26 26.5947467816 -68 40 32.888148788           K3V-K7V 677 1
2 V* IL Lup HXB 15 47 08.2766679321 -47 40 10.284971214     11.96     ~ 426 1
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* V821 Ara HXB 17 02 49.3810714542 -48 47 23.163091737 16.20 16.30 15.5     ~ 1826 0
6 V* V2606 Oph CV* 17 42 40.030 -27 44 52.70     23.2     ~ 119 0
7 NAME XTE J17464-3213 LXB 17 46 15.59637 -32 14 00.8600           ~ 631 0
8 AX J1748.0-2829 LXB 17 48 05.060 -28 28 25.80     13.60     ~ 175 0
9 V* V4641 Sgr HXB 18 19 21.6342721789 -25 24 25.849323550     13.654   13.092 B9III 407 1
10 V* V406 Vul HXB 18 58 41.580 +22 39 29.40 15.00 15.65 15.31     G5V-K0V 326 0
11 Granat 1915+105 HXB 19 15 11.55576 +10 56 44.9052           ~ 2361 0
12 INTREF 1012 LXB 20 12 37.7593213138 +38 11 00.771841820     21.33     ~ 62 0
13 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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2021.04.19-14:36:25

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