2011A&A...526A.132G


C.D.S. - SIMBAD4 rel 1.7 - 2019.09.21CEST12:02:02

2011A&A...526A.132G - Astronomy and Astrophysics, volume 526A, 132-132 (2011/2-1)

The scaling of X-ray variability with luminosity in ultra-luminous X-ray sources.

GONZALEZ-MARTIN O., PAPADAKIS I., REIG P. and ZEZAS A.

Abstract (from CDS):

We investigate the relationship between the X-ray variability amplitude and X-ray luminosity for a sample of 14 bright ultra-luminous X-ray sources (ULXs) with emXMM-Newton/EPIC data, and compare it with the well-established, similar relationship for active galactic nuclei (AGN). We computed the normalised excess variance in the 2-10keV light curves of these objects and their 2-10keV band intrinsic luminosity L2–10keV. We also determined model ``variability-luminosity'' relationships for AGN, under several assumptions regarding their power-spectral shape. We compared these model predictions at low luminosities with the ULX data. The variability amplitude of the ULXs is significantly smaller than expected from a simple extrapolation of the AGN ``variability-luminosity'' relationship at low luminosities. We also find evidence of an anti-correlation between the variability amplitude and L2–10keV for ULXs. The shape of this relationship is consistent with the AGN data but only if the ULXs data are shifted by four orders of magnitudes in luminosity. Most (but not all) of the ULXs could be ``scaled-down'' version of AGN if we assume that i) their black hole mass and accretion rate are between ~(2.5-30)x103M and ∼1-80% of the Eddington limit and ii) their power spectral density has a doubly broken power-law shape. This shape and accretion rate is consistent with Galactic black hole systems operating in their so-called ``low-hard'' and ``very-high'' states.

Abstract Copyright:

Journal keyword(s): X-ray: galaxies - Black hole physics - X-ray: binaries

Simbad objects: 23

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Number of rows : 23

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 [BWE2015] NGC 55 119 ULX 00 15 28.89 -39 13 18.8           ~ 34 0
2 RX J004732.9-251748 ULX 00 47 32.97 -25 17 50.2           ~ 32 0
3 ChASeM33 J013350.89+303936.6 SNR 01 33 50.90 +30 39 36.6           ~ 85 1
4 RX J031820.3-662911 UX? 03 18 20.00 -66 29 10.9           ~ 160 1
5 2E 756 ULX 03 18 22.00 -66 36 04.3   23.5 23.6     O9.5 177 3
6 [SST2011] J034555.61+680455.3 ULX 03 45 55.612 +68 04 55.29           ~ 131 1
7 [FK2005] 6 ULX 07 36 25.55 +65 35 40.0           ~ 37 0
8 [SST2011] J081929.00+704219.3 ULX 08 19 28.99 +70 42 19.4           ~ 149 2
9 [FK2005] 7 SNR 09 55 32.95 +69 00 33.6   23.87 23.89     ~ 79 1
10 NAME M82 ULX-1 UX? 09 55 50.01 +69 40 46.0           ~ 232 1
11 [KCF2005] M82 G ULX 09 55 51.040 +69 40 45.49           ~ 143 1
12 M 82 IG 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 5198 6
13 RX J0957.9+6903 ULX 09 57 53.290 +69 03 48.20           ~ 190 4
14 [SST2011] J112015.76+133513.7 UX? 11 20 15.75 +13 35 13.6           ~ 15 1
15 NAME G 1200-2038 Sy1 12 02 56.8 -20 56 03           ~ 130 0
16 [SST2011] J122601.44+333131.1 UX? 12 26 01.53 +33 31 30.6           ~ 33 1
17 RX J123551+27561 ULX 12 35 51.71 +27 56 04.1           ~ 60 1
18 [BWC2008] U32 ULX 13 05 32.89 -49 27 34.1           ~ 11 1
19 [FK2005] 23 ULX 13 29 38.62 +58 25 05.6           ~ 106 2
20 RX J133719-29536 ULX 13 37 20.12 -29 53 47.7           ~ 23 2
21 [FK2005] 25 ULX 14 03 19.63 -41 22 58.7           ~ 185 0
22 HD 226868 HXB 19 58 21.6758193269 +35 12 05.782512305 9.38 9.72 8.91 8.42   O9.7Iabpvar 3841 0
23 UGC 12163 Sy1 22 42 39.3364258078 +29 43 31.301194419   14.86 14.16     ~ 599 1

    Equat.    Gal    SGal    Ecl

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2019.09.21-12:02:02

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