2012ApJ...745...89L


Query : 2012ApJ...745...89L

2012ApJ...745...89L - Astrophys. J., 745, 89 (2012/January-3)

Dynamical mass constraints on the ultraluminous X-ray source NGC 1313 X-2.

LIU J., OROSZ J. and BREGMAN J.N.

Abstract (from CDS):

Dynamical mass measurements hold the key to answering whether ultraluminous X-ray sources (ULXs) are intermediate-mass black holes (IMBHs) or stellar-mass black holes with special radiation mechanisms. NGC 1313 X-2 is so far the only ULX with Hubble Space Telescope light curves, the orbital period, and the black hole's radial velocity amplitude based on the He II λ4686 disk emission line shift of ∼200 km/s. We constrain its black hole mass and other parameters by fitting observations to a binary light curve code with accommodations for X-ray heating of the accretion disk and the secondary. Given the dynamical constraints from the observed light curves and the black hole radial motion and the observed stellar environment age, the only acceptable models are those with 40-50 Myr old intermediate-mass secondaries in their helium core and hydrogen shell burning phase filling 40%-80% of their Roche lobes. The black hole can be a massive black hole of a few tens of M that can be produced from stellar evolution of low-metallicity stars, or an IMBH of a few hundred to above 1000 M if its true radial velocity 2K' < 40 km/s. Further observations are required to better measure the black hole radial motion and the light curves in order to determine whether NGC 1313 X-2 is a stellar-mass black hole or an IMBH.

Abstract Copyright:

Journal keyword(s): accretion, accretion disks - black hole physics - X-rays: binaries - X-rays: individual: NGC 1313 X-2

Simbad objects: 9

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Number of rows : 9
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 NAME IC 10 X-1 HXB 00 20 29.09 +59 16 51.9           ~ 153 0
2 NAME M33 X-7 HXB 01 33 34.13 +30 32 11.3 17.50 18.80 18.70     O 136 2
3 NGC 1313 G 03 18 16.046 -66 29 53.74   10.06 10.0 9.40 10.4 ~ 623 2
4 2E 756 ULX 03 18 22.00 -66 36 04.3   23.5 23.6     O9.5 207 3
5 SN 1993J SN* 09 55 24.77476 +69 01 13.7026   10.8 12.0     SNIIb 1294 1
6 M 81 Sy2 09 55 33.17306143 +69 03 55.0609270   7.89 6.94     ~ 4070 5
7 [FK2005] 25 ULX 14 03 19.63 -41 22 58.7           ~ 203 0
8 NGC 5408 EmG 14 03 20.907 -41 22 39.75   12.59   11.96 12.2 ~ 321 3
9 [JRW2005b] 122 UX? 14 03 32.38 +54 21 03.0   21.13       ~ 102 0

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2021.07.31-09:13:17

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