2009ApJ...690L..39L


C.D.S. - SIMBAD4 rel 1.7 - 2019.10.14CEST09:16:48

2009ApJ...690L..39L - Astrophys. J., 690, L39-L42 (2009/January-1)

Hubble space telescope monitoring reveals a 6.1 day period for an ultraluminous X-ray source in NGC 1313.

LIU J., BREGMAN J.N. and McCLINTOCK J.E.

Abstract (from CDS):

Ultraluminous X-ray sources (ULXs) in nearby galaxies have X-ray luminosities of 1039-1041 erg/s, and are possibly intermediate mass black holes of 102-105 M. NGC 1313 X-2 is an extreme ULX with a maximum luminosity of 3x1040 erg/s, and a frequent target of X-ray and optical observations. Here we report our Hubble Space Telescope Guest Observer (GO) program to monitor its optical counterpart in a search of its period. The 20 monitoring observations over three weeks exhibited periodic modulations at the 6σ level with a period of P = 6.12±0.16 days and an amplitude of A = 0.102 ±0.016 mag. The periodicity is understood as from the orbital motion of the gravitationally distorted secondary that is unevenly irradiated by the X-ray radiation from the primary accretion disk. This is the first photometric period ever discovered for a ULX counterpart. The periodicity rules out a radiation mechanism through relativistic beaming effects. Combined with the photometry, the periodicity suggests that the secondary is most likely a giant branch star with a mass of 11.3-21.0 M and a radius of 14.4-18.3R .

Abstract Copyright:

Journal keyword(s): galaxies: individual: NGC 1313 - X-rays: binaries

CDS comments: NGC 1313 X-2 is [CPS95] X- 2 in Simbad.

Simbad objects: 10

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Number of rows : 10

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 NGC 1313 G 03 18 16.046 -66 29 53.74   10.06 10.0 9.40 10.4 ~ 584 2
2 2E 756 ULX 03 18 22.00 -66 36 04.3   23.5 23.6     O9.5 178 3
3 IC 342 SBG 03 46 48.514 +68 05 45.98   10.5       ~ 1360 1
4 UGC 4305 IG 08 19 04.9878269182 +70 43 13.025604473 12.06 11.72 11.39 11.11   ~ 668 2
5 [SST2011] J081929.00+704219.3 ULX 08 19 28.99 +70 42 19.4           ~ 150 2
6 M 81 Sy2 09 55 33.17306143 +69 03 55.0609270   7.89 6.94     ~ 3887 5
7 M 82 IG 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 5209 6
8 NGC 5204 LSB 13 29 36.508 +58 25 07.43   11.84   11.37   ~ 405 0
9 [FK2005] 23 ULX 13 29 38.62 +58 25 05.6           ~ 107 2
10 M 51 GiP 13 29 52.698 +47 11 42.93   9.26 8.36 8.40   ~ 3680 4

    Equat.    Gal    SGal    Ecl

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2019.10.14-09:16:48

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