2018A&A...612L..12R


C.D.S. - SIMBAD4 rel 1.7 - 2019.12.06CET14:57:05

2018A&A...612L..12R - Astronomy and Astrophysics, volume 612, L12-12 (2018/4-1)

Ultraluminous X-ray sources: new distance indicators?

ROZANSKA A., BRESLER K., BELDYCKI B., MADEJ J. and ADHIKARI T.P.

Abstract (from CDS):


Aims. In this paper we fit the NuSTAR and XMM-Newton data of three sources: NGC 7793 P13, NGC5907 ULX1, and Circinus ULX5.
Methods. Our single model contains emission from a non-spherical system: a neutron star plus an accretion disk directed towards the observer.
Results. We obtained a very good fit with the reduced χ2 per degree of freedom equal to 1.08 for P13, 1.01 for ULX1, and 1.14 for ULX5. The normalization of our model constrains the distance to the source. The resulting distances are D=3.41–0.10+0.11, 6.55–0.81+0.69, and 2.60–0.03+0.05Mpc for P13, ULX1, and ULX5 respectively. The distances to P13 and ULX5 are in perfect agreement with previous distance measurements to their host galaxies.
Conclusions. Our results confirm that P13, ULX1, and ULX5 may contain central hot neutron stars. When the outgoing emission is computed by integration over the emitting surface and successfully fitted to the data, then the resulting model normalization is the direct distance indicator.

Abstract Copyright: © ESO 2018

Journal keyword(s): accretion, accretion disks - stars: neutron - X-rays: general

Simbad objects: 8

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Number of rows : 8

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 NAME Scl Group GrG 01 00 06 -33 44.2           ~ 452 0
2 [KCF2005] M82 G ULX 09 55 51.040 +69 40 45.49           ~ 149 1
3 [WMR2006] Circinus XMM2 X 14 12 39.20 -65 23 34.3           ~ 9 0
4 NAME Circinus Galaxy Sy2 14 13 09.906 -65 20 20.47   10.89 9.84 10.6 10.0 ~ 971 2
5 NGC 5906 GiG 15 15 53.687 +56 19 43.86   11.4       ~ 659 1
6 [SST2011] J151558.60+561810.0 ULX 15 15 58.60 +56 18 10.0           ~ 75 0
7 NGC 7793 GiG 23 57 49.7533807411 -32 35 27.708304655 10.26 9.74 9.28 9.06 9.7 ~ 893 2
8 NAME NGC 7793 X-1 X 23 57 50.90 -32 37 26.6           ~ 102 0

    Equat.    Gal    SGal    Ecl

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2019.12.06-14:57:05

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