2020MNRAS.498.5353B


C.D.S. - SIMBAD4 rel 1.7 - 2021.04.18CEST11:58:10

2020MNRAS.498.5353B - Mon. Not. R. Astron. Soc., 498, 5353-5360 (2020/November-2)

Observing imprints of black hole event horizon on X-ray spectra.

BANERJEE S., GILFANOV M., BHATTACHARYYA S. and SUNYAEV R.

Abstract (from CDS):

A fundamental difference between a neutron star (NS) and a black hole (BH) is the absence of a physical surface in the latter. For this reason, any remaining kinetic energy of the matter accreting on to a BH is advected inside its event horizon. In the case of an NS, on the contrary, accreting material is decelerated on the NS surface, and its kinetic energy is eventually radiated away. Copious soft photons produced by the NS surface will affect the properties of the Comptonized component dominating spectra of X-ray binaries in the hard state. Thus, parameters of the Comptonized spectra - the electron temperature kTe and the Compton y-parameter, could serve as an important tool for distinguishing BHs from NSs. In this paper, we systematically analyse heretofore the largest sample of spectra from the BH and NS X-ray binaries in the hard state for this purpose, using archival RXTE/PCA and RXTE/HEXTE observations. We find that the BHs and NSs occupy distinctly different regions in the y - kTe plane with NSs being characterized by systematically lower values of y-parameter and electron temperature. Due to the shape of the boundary between BHs and NSs on the y - kTe plane, their 1D y and kTe distributions have some overlap. A cleaner one parameter diagnostic of the nature of the compact object in X-ray binaries is provided by the Compton amplification factor A, with the boundary between BHs and NSs lying at A ≃ 3.5-4. This is by far the most significant detection of the imprint of the event horizon on the X-ray spectra for stable stellar-mass BHs.

Abstract Copyright: © 2020 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): accretion, accretion discs - methods: data analysis - stars: black holes - stars: neutron - X-rays: binaries - X-rays: general

Simbad objects: 26

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Number of rows : 26

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 V* V1055 Ori LXB 06 17 07.3 +09 08 13   18.80 18.5     ~ 522 1
2 V* BW Cir HXB 13 58 09.700 -64 44 05.80 17.90 18.00 16.9     ~ 202 1
3 V* V381 Nor HXB 15 50 58.6520652623 -56 28 35.309070422   17.95 16.6     K3III 1062 0
4 V* QX Nor LXB 16 12 43.0 -52 25 23           ~ 849 1
5 V* V801 Ara LXB 16 40 55.5979962948 -53 45 04.953475039 17.50 18.20 17.5   17.07 ~ 803 1
6 [GHJ2008] 3 HXB 16 50 00.980 -49 57 43.60     11.89     K4V 358 0
7 V* V1033 Sco HXB 16 54 00.137 -39 50 44.90   15.20 14.2 16.14   F5IV 1751 1
8 V* V821 Ara HXB 17 02 49.3810714542 -48 47 23.163091737 16.20 16.30 15.5     ~ 1826 0
9 X Ara X-1 LXB 17 06 15.314 -43 02 08.69           ~ 244 1
10 4U 1705-44 LXB 17 08 54.470 -44 06 07.35           ~ 362 0
11 SAX J1711.6-3808 XB* 17 11 37.1 -38 07 06           ~ 37 0
12 4U 1722-30 LXB 17 27 33.25 -30 48 07.4     12.50     ~ 239 1
13 NAME Slow Burster LXB 17 31 57.73 -33 50 02.5     15.50     ~ 775 1
14 NAME Galactic Center gam 17 45 39.60213 -29 00 22.0000           ~ 12110 0
15 NAME XTE J17464-3213 LXB 17 46 15.59637 -32 14 00.8600           ~ 631 0
16 AX J1748.0-2829 LXB 17 48 05.060 -28 28 25.80     13.60     ~ 175 0
17 [KRL2007b] 291 LXB 17 51 13.49 -30 37 23.4           ~ 234 0
18 XTE J1752-223 LXB 17 52 15.090 -22 20 32.36           ~ 168 0
19 2MAXI J1753-013 LXB 17 53 28.2897263704 -01 27 06.256526637 15.30 16.73 16.46 16.15 15.64 ~ 302 0
20 V* V4580 Sgr LXB 18 08 27.54 -36 58 44.3   16.81 16.51     ~ 895 0
21 X Sgr X-4 LXB 18 23 40.57 -30 21 40.6   19.06 18.81     ~ 921 1
22 V* V4634 Sgr LXB 18 29 28.2 -23 47 49 18.90 19.40 19     ~ 300 0
23 2MAXI J1900-248 LXB 19 00 08.65 -24 55 13.7     18.09     ~ 188 0
24 X Aql X-1 LXB 19 11 16.0572031521 +00 35 05.876658556           ~ 1040 1
25 HD 226868 HXB 19 58 21.6758193269 +35 12 05.782512305 9.38 9.72 8.91 8.42   O9.7Iabpvar 3997 0
26 NAME Galactic Ridge ? ~ ~           ~ 444 1

    Equat.    Gal    SGal    Ecl

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2021.04.18-11:58:10

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