2023A&A...671A.159T


Query : 2023A&A...671A.159T

2023A&A...671A.159T - Astronomy and Astrophysics, volume 671A, 159 (2023/3-1)

OJ 287: A new BH mass estimate of the secondary.

TITARCHUK L., SEIFINA E. and SHRADER C.

Abstract (from CDS):

We present a study of outburst activity in the BL Lacertae source OJ 287, which has been observed extensively with the X-ray telescope (XRT) on board the Neil Gehrels Swift Observatory. We demonstrate that the results of our analysis of X-ray flaring activity using the Swift/XRT data allow for the key characteristics of the OJ 287 secondary to be refined (its nature and mass). We discover that the energy spectra in all spectral states can be fitted using the XSPEC bulk motion Comptonization (BMC) model. As a result we find that the X-ray photon index of the BMC model, Γ, correlates with the mass accretion rate, . We establish that Γ increases monotonically with from the low-hard state, Γ ∼ 1.5, to the high-soft state, Γ ∼ 2.8, and finally saturates. The index behavior is similar to that in a number of black hole (BH) candidates in which we show that its saturation is observational evidence of the presence of a BH. Based on this correlation, we applied a scaling method and determine that a secondary BH mass in OJ 287 is about ∼1.25 × 108 solar masses, using the well-studied X-ray BH binaries XTE 1550-564, H 1743-322, 4U 1630-47, and GRS 1915+105 as well as extragalactic BHs ESO 243-49 and M101 ULX-1, as reference sources. Also, using the power spectrum analysis, we infer the size of the Compton cloud LCC ∼ 1013 cm where X-ray spectra were formed. Using this value of LCC, we confirm that a BH mass of the secondary in OJ 287 was on the order of 108 solar masses as we derived using the index, Γ-correlation (the scaling method) with respect of the mass accretion rate.

Abstract Copyright: © The Authors 2023

Journal keyword(s): accretion - accretion disks - black hole physics - galaxies: active - BL Lacertae objects: individual: OJ 287 - X-rays: galaxies

Simbad objects: 11

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Number of rows : 11
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 ESO 243-49 GiG 01 10 27.7550638752 -46 04 27.356310264 16.54 14.92   13.48   ~ 176 0
2 [FWB2009] HLX-1 ULX 01 10 28.30 -46 04 22.3     24.5 23.80   ~ 202 1
3 QSO J0854+2006 BLL 08 54 48.8749846272 +20 06 30.639583620   15.91 15.43 15.56   ~ 2344 1
4 NAME Lower Centaurus Crux As* 12 19 -57.1           ~ 479 1
5 M 87 AGN 12 30 49.42338414 +12 23 28.0436859 10.16 9.59 8.63   7.49 ~ 7221 3
6 M 101 GiP 14 03 12.583 +54 20 55.50   8.46 7.86 7.76   ~ 2919 2
7 2MASS J14301603+2303445 Sy2 14 30 16.0439198328 +23 03 44.499607740           ~ 26 0
8 V* V381 Nor HXB 15 50 58.6637920704 -56 28 35.258385000   17.95 16.6     K3III 1175 0
9 X Nor X-1 LXB 16 34 01.610 -47 23 34.80           ~ 521 0
10 NAME XTE J17464-3213 LXB 17 46 15.59637 -32 14 00.8600           ~ 746 0
11 Granat 1915+105 HXB 19 15 11.55576 +10 56 44.9052           ~ 2633 0

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