2005PASJ...57..507T


C.D.S. - SIMBAD4 rel 1.7 - 2020.11.25CET07:21:11

2005PASJ...57..507T - Publ. Astron. Soc. Jap., 57, 507-511 (2005/June-0)

Spectral evolution of a luminous compact X-ray source in NGC 253 with Chandra and XMM-Newton observatories.

TANAKA T., SUGIHO M., KUBOTA A., MAKISHIMA K. and TAKAHASHI T.

Abstract (from CDS):

begin{HTML} Spectral studies of a luminous X-ray source, NGC 253 X21, are presented based on archival Chandra and XMM-Newton data. The Chandra observation on 1999 December 16 detected the source at a bolometric luminosity of 0.3 * 10<sup>39</sup> erg s<sup>-1</sup> (assuming isotropic emission), while an XMM-Newton observation on 2000 June 3 revealed a short-term source variation in the range of (0.6–1.3) * 10<sup>39</sup> erg s<sup>-1</sup>. All spectra from these observations were successfully modeled by emission from an optically thick accretion disk. The average inner disk radius was kept constant at 63 * (cos60°/cos i)<sup>1/2</sup> km, where i is the disk inclination, and did not vary significantly, while the disk inner temperature changed in the range of 0.9-1.4keV. Assuming that this object is an accreting Schwarzschild black hole, and that the disk inner radius coincides with its last stable orbit, the mass of the black hole is estimated to be ∼ 7 M<sub>☉</sub>. The disk luminosity corresponds to (30–120)*(cos60°/cos i)% of the Eddington limit of this black hole. Therefore, this luminous X-ray source, NGC 253 X21, is understood consistently to be an accreting stellar mass black hole in the standard disk state.

Abstract Copyright:

Journal keyword(s): accretion, accretion disks - black hole physics - galaxy: individual: NGC 253

Simbad objects: 14

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Number of rows : 14

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 RX J004722.4-252051 ULX 00 47 22.59 -25 20 50.9           ~ 35 0
2 NGC 253 SyG 00 47 33.134 -25 17 19.68   8.03   6.94 8.1 ~ 2970 2
3 ChASeM33 J013350.89+303936.6 SNR 01 33 50.90 +30 39 36.6           ~ 87 1
4 2E 756 ULX 03 18 22.00 -66 36 04.3   23.5 23.6     O9.5 194 3
5 [SST2011] J034555.61+680455.3 ULX 03 45 55.612 +68 04 55.29           ~ 141 1
6 2XMM J034615.6+681112 UX? 03 46 15.61 +68 11 12.8           ~ 28 0
7 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 15050 1
8 X LMC X-3 HXB 05 38 56.6325045489 -64 05 03.321118015   17 17.2     B2.5Ve 633 0
9 2E 0731.6+6542 X 07 36 25.3 +65 36 16           ~ 9 0
10 [FK2005] 7 SNR 09 55 32.95 +69 00 33.6   23.87 23.89     ~ 80 1
11 V* GU Mus HXB 11 26 26.5947467816 -68 40 32.888148788           K3V-K7V 675 1
12 [RW2000] NGC 4449 X-2 X 12 28 10.5 +44 05 51           ~ 2 0
13 V* V381 Nor HXB 15 50 58.6520652623 -56 28 35.309070422   17.95 16.6     K3III 1040 0
14 V* QZ Vul HXB 20 02 49.58 +25 14 11.3   19.64 18.2     K3V-K6V 400 0

    Equat.    Gal    SGal    Ecl

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2020.11.25-07:21:11

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