2014ApJ...791...70T


C.D.S. - SIMBAD4 rel 1.7 - 2021.04.15CEST06:18:33

2014ApJ...791...70T - Astrophys. J., 791, 70 (2014/August-2)

A delayed transition to the hard state for 4U 1630-47 at the end of its 2010 outburst.

TOMSICK J.A., YAMAOKA K., CORBEL S., KALEMCI E., MIGLIARI S. and KAARET P.

Abstract (from CDS):

Here we report on Swift and Suzaku observations near the end of an outburst from the black hole transient 4U 1630-47 and Chandra observations when the source was in quiescence. 4U 1630-47 made a transition from a soft state to the hard state ∼50 days after the main outburst ended. During this unusual delay, the flux continued to drop, and one Swift measurement found the source with a soft spectrum at a 2-10 keV luminosity of L = 1.07x1035 erg/s for an estimated distance of 10 kpc. While such transients usually make a transition to the hard state at L/LEdd= 0.3%-3%, where LEdd is the Eddington luminosity, the 4U 1630-47 spectrum remained soft at L/LEdd= 0.008 M10–1% (as measured in the 2-10 keV band), where M10is the mass of the black hole in units of 10 M. An estimate of the luminosity in the broader 0.5-200 keV bandpass gives L/LEdd= 0.03 M10–1%, which is still an order of magnitude lower than typical. We also measured an exponential decay of the X-ray flux in the hard state with an e-folding time of 3.39±0.06 days, which is much less than previous measurements of 12-15 days during decays by 4U 1630-47 in the soft state. With the ∼100 ks Suzaku observation, we do not see evidence for a reflection component, and the 90% confidence limits on the equivalent width of a narrow iron Kα emission line are <40 eV for a narrow line and <100 eV for a line of any width, which is consistent with a change of geometry (either a truncated accretion disk or a change in the location of the hard X-ray source) in the hard state. Finally, we report a 0.5-8 keV luminosity upper limit of <2x1032 erg/s in quiescence, which is the lowest value measured for 4U 1630-47 to date.

Abstract Copyright:

Journal keyword(s): accretion, accretion disks - black hole physics - stars: individual: (4U 1630-47) - X-rays: general - X-rays: stars

Simbad objects: 9

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Number of rows : 9

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 3FHL J1633.0-4746e HXB 16 32 01.87 -47 52 28.3           O8I 151 3
2 X Nor X-1 LXB 16 34 01.610 -47 23 34.80           ~ 438 0
3 [GHJ2008] 3 HXB 16 50 00.980 -49 57 43.60     11.89     K4V 358 0
4 V* V821 Ara HXB 17 02 49.3810714542 -48 47 23.163091737 16.20 16.30 15.5     ~ 1826 0
5 V* V1228 Sco LXB 17 19 58.990 -31 45 01.11           ~ 109 1
6 NAME Great Annihilator LXB 17 43 54.83 -29 44 42.6           ~ 642 1
7 XTE J1752-223 LXB 17 52 15.090 -22 20 32.36           ~ 168 0
8 2XMM J180112.4-254436 LXB 18 01 12.40 -25 44 36.1           ~ 366 1
9 NAME Galactic Ridge ? ~ ~           ~ 444 1

    Equat.    Gal    SGal    Ecl

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2021.04.15-06:18:33

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