Academic Journal
A Wolf-Rayet/black-hole X-ray binary candidate in NGC 300
| العنوان: | A Wolf-Rayet/black-hole X-ray binary candidate in NGC 300 |
|---|---|
| المؤلفون: | S. Carpano, A. M. T. Pollock, J. Wilms, M. Ehle, M. Schirmer |
| المساهمون: | The Pennsylvania State University CiteSeerX Archives |
| المصدر: | http://arxiv.org/pdf/astro-ph/0611424v1.pdf. |
| سنة النشر: | 2006 |
| المجموعة: | CiteSeerX |
| مصطلحات موضوعية: | Key words. Galaxies, individual, NGC 300 – X-rays, binaries – Stars, Wolf-Rayet |
| الوصف: | 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 withΓ∼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 ∼ 2×10 38 erg s −1. 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 L0.2−10 keV ∼ 1×10 39 erg s −1, suggesting the presence of a black hole. |
| نوع الوثيقة: | text |
| وصف الملف: | application/pdf |
| اللغة: | English |
| Relation: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.316.5498; http://arxiv.org/pdf/astro-ph/0611424v1.pdf |
| الاتاحة: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.316.5498 http://arxiv.org/pdf/astro-ph/0611424v1.pdf |
| Rights: | Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
| رقم الانضمام: | edsbas.BE2B6C39 |
| قاعدة البيانات: | BASE |
| الوصف غير متاح. |