2004MNRAS.349...39C


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.19CEST18:05:40

2004MNRAS.349...39C - Mon. Not. R. Astron. Soc., 349, 39-51 (2004/March-3)

Probable intermediate-mass black holes in NGC 4559: XMM-Newton spectral and timing constraints.

CROPPER M., SORIA R., MUSHOTZKY R.F., WU K., MARKWARDT C.B. and PAKULL M.

Abstract (from CDS):

We have examined X-ray and optical observations of two ultraluminous X-ray sources, X7 and X10 in NGC 4559, using XMM-Newton, Chandra and the Hubble Space Telescope (HST). The ultraviolet/X-ray luminosity of X7 exceeds 2.1x1040 erg/s in the XMM-Newton observation, and that of X10 is > 1.3x1040 erg/s. X7 has both thermal and power-law spectral components, The characteristic temperature of the thermal component is 0.12 keV. The power-law components in the two sources both have slopes with photon index ≃2.1. A timing analysis of X7 indicates a break frequency at 28 MHz in the power spectrum, while that for X10 is consistent with an unbroken power law. The luminosity of the blackbody component in the X-ray spectrum of X7 and the nature of its time-variability provides evidence that this object is an intermediate-mass black hole accreting at sub-Eddington rates, but other scenarios which require high advection efficiencies from a hollowed-out disc might be possible. The emission from X10 can be characterized by a single power-law. This source can be interpreted either as an intermediate-mass black hole, or as a stellar mass black hole with relativistically beamed Comptonized emission. There are four optical counterparts in the error circle of X7. No counterparts are evident in the error circle for X10.

Abstract Copyright: 2004 RAS

Journal keyword(s): accretion, accretion discs - black hole physics - galaxies: individual: NGC 4559 - X-rays: galaxies - X-rays: stars

Errata: erratum vol. 353, p. 1024 (2004)

Simbad objects: 18

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Number of rows : 18

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 RX J031820.3-662911 UX? 03 18 20.00 -66 29 10.9           ~ 171 1
2 2E 756 ULX 03 18 22.00 -66 36 04.3   23.5 23.6     O9.5 192 3
3 [SST2011] J034555.61+680455.3 ULX 03 45 55.612 +68 04 55.29           ~ 141 1
4 [F88] X-1 X 09 54 29.14 +69 02 33.5           ~ 5 0
5 NAME M82 ULX-1 UX? 09 55 50.01 +69 40 46.0           ~ 241 1
6 V* KV UMa HXB 11 18 10.7922353051 +48 02 12.319175505     12.25     K5V-M1V 726 0
7 [ZFR2002] 13 HXB 12 01 51.62 -18 52 31.9           ~ 14 0
8 RX J123551+27561 ULX 12 35 51.71 +27 56 04.1           ~ 60 1
9 NGC 4559 H2G 12 35 57.6399424117 +27 57 35.859639262   10.46 10.01     ~ 539 1
10 [SST2011] J123557.79+275807.4 UX? 12 35 57.77 +27 58 07.4           ~ 10 0
11 RX J123558+27577 UX? 12 35 58.56 +27 57 41.9           ~ 36 2
12 NGC 4725 Sy2 12 50 26.5692916552 +25 30 02.737610391   13.45 12.44     ~ 627 2
13 [FK2005] 23 ULX 13 29 38.62 +58 25 05.6           ~ 109 2
14 V* V1033 Sco HXB 16 54 00.137 -39 50 44.90   15.20 14.2 16.14   F5IV 1719 1
15 V* V821 Ara HXB 17 02 49.3810714542 -48 47 23.163091737 16.20 16.30 15.5     ~ 1783 0
16 SS 433 HXB 19 11 49.5645897701 +04 58 57.824087535   16.3 13.0     A7Ib: 1941 3
17 HD 226868 HXB 19 58 21.6758193269 +35 12 05.782512305 9.38 9.72 8.91 8.42   O9.7Iabpvar 3947 0
18 V* V1521 Cyg HXB 20 32 25.78 +40 57 27.9           WN4/5-6/7 1778 2

    Equat.    Gal    SGal    Ecl

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2020.10.19-18:05:40

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