2018A&A...613A..48S


C.D.S. - SIMBAD4 rel 1.7 - 2020.08.09CEST07:57:54

2018A&A...613A..48S - Astronomy and Astrophysics, volume 613A, 48-48 (2018/5-1)

NGC 4051: Black hole mass and photon index-mass accretion rate correlation.

SEIFINA E., CHEKHTMAN A. and TITARCHUK L.

Abstract (from CDS):

We present a discovery of the correlation between the X-ray spectral (photon) index and mass accretion rate observed in an active galactic nucleus, NGC 4051. We analyzed spectral transition episodes observed in NGC 4051 using XMM-Newton, Suzaku and RXTE. We applied a scaling technique for a black hole (BH) mass evaluation which uses a correlation between the photon index and normalization of the seed (disk) component, which is proportional to a mass accretion rate. We developed an analytical model that shows the spectral (photon) index of the BH emergent spectrum undergoes an evolution from lower to higher values depending on a mass accretion rate in the accretion disk. We considered Cygnus X-1 and GRO J1550-564 as reference sources for which distances, inclination angles and the BH masses are evaluated by dynamical measurements. Application of the scaling technique for the photon index-mass accretion rate correlation provides an estimate of the black hole mass in NGC 4051 to be more than 6x105 solar masses.

Abstract Copyright: © ESO 2018

Journal keyword(s): accretion, accretion disks - black hole physics - radiation mechanisms: non-thermal - stars: black holes

Simbad objects: 7

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Number of rows : 7

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 [FWB2009] HLX-1 ULX 01 10 28.30 -46 04 22.3     24.5 23.80   ~ 156 1
2 NGC 4051 Sy1 12 03 09.6098828919 +44 31 52.693714606   11.08 12.92 9.94   ~ 1995 1
3 M 101 GiP 14 03 12.583 +54 20 55.50   8.46 7.86 7.76   ~ 2552 2
4 V* V381 Nor HXB 15 50 58.6520652623 -56 28 35.309070422   17.95 16.6     K3III 1027 0
5 V* V818 Sco LXB 16 19 55.0688745859 -15 38 25.019920749 11.60 12.40 11.1     Oev 1527 0
6 V* V1033 Sco HXB 16 54 00.137 -39 50 44.90   15.20 14.2 16.14   F5IV 1705 1
7 HD 226868 HXB 19 58 21.6758193269 +35 12 05.782512305 9.38 9.72 8.91 8.42   O9.7Iabpvar 3934 0

    Equat.    Gal    SGal    Ecl

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2020.08.09-07:57:54

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