منابع مشابه
Cosmic X-ray Sources
The atmosphere of the Earth is opaque to most wavelengths of light in the infrared, in the ultraviolet and in the X-rays. Due to this fact observation of celestial objects in X-rays (in the range of energies from 0.5 to 20 keV) must be carried out outside the atmosphere at altitudes greater than 100 kilometers, namely from space. The development of X-ray astronomy had therefore to await the dev...
متن کاملUltraluminous X-ray Sources
The Chandra X-Ray Observatory was used to image the collisional ring galaxy Arp 147 for 42 ks. We detect nine X-ray sources with luminosities in the range of (1.4–7) × 1039 erg s−1 (assuming that the sources emit isotropically) in or near the blue knots of star formation associated with the ring. A source with an X-ray luminosity of 1.4 × 1040 erg s−1 is detected in the nuclear region of the in...
متن کاملReview of the laser based X-ray sources and its application in medicine
This article has no abstract.
متن کاملThe Sources of the X–ray Background
Deep X–ray surveys have shown that the cosmic X–ray background (XRB) is largely due to the accretion onto su-permassive black holes, integrated over cosmic time. The ROSAT, Chandra and XMM–Newton satellites have resolved more than 80% of the 0.1–10 keV X–ray background into discrete sources. Optical spectroscopic identifications are about 90% and 60% complete, for the deepest ROSAT and Chandra/...
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ژورنال
عنوان ژورنال: Nihon Kessho Gakkaishi
سال: 1985
ISSN: 0369-4585,1884-5576
DOI: 10.5940/jcrsj.27.152