X-ray emission from the Wolf-Rayet bubble S308

Дата и время публикации : 2012-01-13T16:09:07Z

Авторы публикации и институты :
J. A. Toalá
M. A. Guerrero
Y. -H. Chu
R. A. Gruendl
S. J. Arthur
R. C. Smith
S. L. Snowden

Ссылка на журнал-издание: Ссылка на журнал-издание не найдена
Коментарии к cтатье: To appear in the Astrophysical Journal
Первичная категория: astro-ph.SR

Все категории : astro-ph.SR

Краткий обзор статьи: The Wolf-Rayet (WR) bubble S 308 around the WR star HD 50896 is one of the only two WR bubbles known to possess X-ray emission. We present XMM-Newton observations of three fields of this WR bubble that, in conjunction with an existing observation of its Northwest quadrant, map most of the nebula. The X-ray emission from S 308 displays a limb-brightened morphology, with a central cavity ~22 arcmin in size and a shell thickness of ~8 arcmin. This X-ray shell is confined by the optical shell of ionized material. The spectrum is dominated by the He-like triplets of NIV at 0.43 keV and OVII at 0.57 keV, and declines towards high energies, with a faint tail up to 1 keV. This spectrum can be described by a two-temperature optically thin plasma emission model (T1 ~ 1.1×10^6 K, T2 ~ 13×10^6 K), with a total X-ray luminosity ~2×10^33 erg/s at the assumed distance of 1.5 kpc.

Category: Physics