A Wolf-Rayet/black-hole X-ray binary candidate in NGC 300

Details A Wolf-Rayet/black-hole X-ray binary candidate in NGC 300 A Wolf-Rayet/black-hole X-ray binary candidate in NGC 300

2006-11-14

arxiv.org/abs/astro-ph/0611424v1

Astronomy and Astrophysics

Astrophysics

4 pages, 3 figures, accepted as Letter in A&A

Scientific paper

10.1051/0004-6361:20066527

Context. Wolf Rayet/black hole binaries are believed to exist as a later evolutionary product of high-mass X-ray binaries. Hundreds of such binaries may exist in galaxies, but only a few of them are close enough to be observed as X-ray binaries. Only a couple of candidates have been reported so far. Aims. Based on XMM-Newton observations, we report the positional coincidence of the brightest X-ray source in NGC 300 (NGC 300 X-1) with a Wolf-Rayet candidate. Temporal and spectral analysis of the X-ray source is performed. Methods. We determine an accurate X-ray position of the object, and derive light curves, spectra and flux in four XMM-Newton observations. Results. The positions of the X-ray source and the helium star candidate coincide within 0.11"+-0.45". The X-ray light curves show irregular variability. During one XMM-Newton observation, the flux increased by about a factor of ten in 10 hours. The spectrum can be modelled by a power-law with Gamma~2.45 with additional relatively weak line emission, notably around 0.95 kev. The mean observed (absorbed) luminosity in the 0.2-10 kev band is ~2x10^38 erg/s. Conclusions. NGC 300 X-1 is a good candidate for a Wolf-Rayet/black-hole X-ray binary: its position coincides with a Wolf-Rayet candidate and the unabsorbed X-ray luminosity reached L(0.2-10 kev)~1x10^39 erg/s, suggesting the presence of a black hole.

Affiliated with

Also associated with

No associations

Rating

A Wolf-Rayet/black-hole X-ray binary candidate in NGC 300 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with A Wolf-Rayet/black-hole X-ray binary candidate in NGC 300, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A Wolf-Rayet/black-hole X-ray binary candidate in NGC 300 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-487448