SIMBAD references

2010MNRAS.403L..41C - Mon. Not. R. Astron. Soc., 403, L41-L45 (2010/March-3)

NGC 300 X-1 is a wolf-rayet/black hole binary.

CROWTHER P.A., BARNARD R., CARPANO S., CLARK J.S., DHILLON V.S. and POLLOCK A.M.T.

Abstract (from CDS):

We present Very Large Telescope/FORS2 time-series spectroscopy of the Wolf-Rayet (WR) star {num}41 in the Sculptor group galaxy NGC 300. We confirm a physical association with NGC 300 X-1, since radial velocity variations of the Heii λ4686 line indicate an orbital period of 32.3±0.2h which agrees at the 2σ level with the X-ray period from Carpano et al. We measure a radial velocity semi-amplitude of 267±8km/s, from which a mass function of 2.6±0.3M is obtained. A revised spectroscopic mass for the WN-type companion of 26+7–5M yields a black hole mass of 20±4M for a preferred inclination of 60°-75°. If the WR star provides half of the measured visual continuum flux, a reduced WR (black hole) mass of 15+4–2.5M(14.5+3–2.5M) would be inferred. As such, {num}41/NGC 300 X-1 represents only the second extragalactic WR plus black hole binary system, after IC 10 X-1. In addition, the compact object responsible for NGC 300 X-1 is the second highest stellar-mass black hole known to date, exceeded only by IC 10 X-1.

Abstract Copyright: © 2010 The Authors. Journal compilation © 2010 RAS

Journal keyword(s): stars: Wolf-Rayet - galaxies: individual: NGC 300 - X-rays: binaries - X-rays: individual: NGC 300 X-1

Status at CDS:  

Simbad objects: 20

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2020.06.07-02:58:37

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