2011ApJ...743..185B


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.05CET18:43:48

2011ApJ...743..185B - Astrophys. J., 743, 185 (2011/December-3)

Reinstating the M31 X-ray system RX J0042.3+4115 as a black hole X-ray binary and compelling evidence for an extended Corona.

BARNARD R., GARCIA M.R. and MURRAY S.S.

Abstract (from CDS):

The M31 X-ray source RX J0042.3+4115 was originally identified as a black hole (BH) binary because it displayed characteristic low-state variability at conspicuously high luminosities; unfortunately, this variability was later found to be artificial. However, analysis of 84 Chandra ACIS observations, a Hubble Space Telescope Advanced Camera for Surveys (ACS)/WFC observation, and a 60 ks XMM-Newton observation has supplied new evidence that RX J0042.3+4115 is indeed a BH binary. The brightest optical star within 3σ of the position of RXJ0042.3+4115 had a F435W (∼B) magnitude of 25.4±0.2; MB > -0.4, hence we find a low-mass donor likely. RX J0042.3+4115 was persistently bright over ∼12 years. Spectral fits revealed characteristic BH binary states: a low/hard state at 2.08±0.08x1038 erg/s and a steep power-law state at 2.41±0.05x1038 erg/s (0.3-10 keV). The high-luminosity low state suggests a ∼20 Mprimary; this is high, but within the range of known stellar BH masses. The inner disk temperature during the steep power-law state is 2.24±0.15 keV, high but strikingly similar to that of GRS 1915+105, the only known Galactic BH binary with a low-mass donor to be persistently bright. Therefore, RX J0042.3+4115 may be an analog for GRS 1915+105; however, other mechanisms may account for its behavior. We find compelling evidence for an extended corona during the steep power-law state, because compact corona models where the seed photons for Comptonization are tied to the inner disk temperature are rejected.

Abstract Copyright:

Journal keyword(s): black hole physics - X-rays: binaries - X-rays: general

Simbad objects: 11

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Number of rows : 11

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 NAME IC 10 X-1 HXB 00 20 29.09 +59 16 51.9           ~ 150 0
2 RX J004222.8+411536 XB* 00 42 22.919 +41 15 35.14           ~ 21 0
3 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 11217 1
4 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 9710 1
5 X LMC X-3 HXB 05 38 56.6325045489 -64 05 03.321118015   17 17.2     B2.5Ve 635 0
6 X LMC X-1 HXB 05 39 38.8285930597 -69 44 35.533031148   14.8 14.5     O8(f)p 573 2
7 2XMM J180112.4-254436 LXB 18 01 12.40 -25 44 36.1           ~ 366 1
8 Granat 1915+105 HXB 19 15 11.55576 +10 56 44.9052           ~ 2347 0
9 HD 226868 HXB 19 58 21.6758193269 +35 12 05.782512305 9.38 9.72 8.91 8.42   O9.7Iabpvar 3984 0
10 V* V1341 Cyg LXB 21 44 41.1544523872 +38 19 17.065856122 15.00 15.13 14.68 15.00   A9III 1091 1
11 NAME Local Group GrG ~ ~           ~ 7188 0

    Equat.    Gal    SGal    Ecl

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2021.03.05-18:43:48

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