Star rays
نویسندگان
چکیده
منابع مشابه
Gamma rays from star-forming regions
Star-forming regions have been tentatively associated with gamma-ray sources since the early days of the COS B satellite. After the Compton Gamma-Ray Observatory, the statistical evidence for such an association has became overwhelming. Recent results from Cherenkov telescopes indicate that some high-energy sources are produced in regions of active star formation like Cygnus OB2 and Westerlund ...
متن کاملSpectral Modeling of X-rays from Hot Star Winds
We attempt to determine the mass-loss rates of several O stars using x-ray spectra from Chandra’s archive. Models of x-ray production in hot star winds predict broad, asymmetric emission lines, but observed lines tend to be much more symmetric. Such symmetry can be explained by either lowering the values of the mass-loss rate for these winds, or by reassessing the commonly accepted models of x-...
متن کاملX-rays from Star-Forming Regions in the VLT Era
The association between star-forming regions and X-ray emission was discovered over 30 years ago. We now know that essentially all young stellar objects, T Tauri stars and protostars, are X-ray emitters, although the case of the youngest, Class 0 protostars, is less clear. The paper highlights X-ray emission and absorption mechanisms, and summarizes X-ray observations of young stellar objects. ...
متن کاملUltra-High-Energy Cosmic Rays from Young Neutron Star Winds.
The long-held notion that the highest energy cosmic rays are of distant extragalactic origin is challenged by observations that events above approximately 1020 eV do not exhibit the expected high-energy cutoff from photopion production off the cosmic microwave background. We suggest that these unexpected ultra-high-energy events are due to iron nuclei accelerated from young strongly magnetized ...
متن کاملThe Herbig Ae Star Hd 163296 in X-rays
Chandra X-ray imaging spectroscopy of the nearby Herbig Ae star HD 163296 at 100 AU angular resolution is reported. A point-like, soft (kT∼0.5 keV), emission-line source is detected at the location of the star with an X-ray luminosity of 4 × 10 ergs s (logLX/Lbol = −5.48). In addition, faint emission along the direction of a previously-detected Lyα-emitting jet and Herbig-Haro outflow may be pr...
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ژورنال
عنوان ژورنال: Science
سال: 1887
ISSN: 0036-8075,1095-9203
DOI: 10.1126/science.ns-9.205.14-a