Background to Astronomy
نویسندگان
چکیده
منابع مشابه
Cosmic Microwave Background astronomy
described here is my own, unless specifically stated otherwise. To the best of my knowledge it has not, nor has any similar dissertation, been submitted for a degree, diploma or other qualification at this, or any other university. This dissertation does not exceed 60 000 words in length. To Isabel and Ffion ii I am not sure how the universe was formed. But it knew how to do it, and that is the...
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The design and performance of a new type of far-infrared telescope is discussed. The instrument is only 20cm in diameter, but its performance exceeds that of other telescopes at lOOp. The performance of far-infrared telescopes is limited not only by size but also by design and environment. The 30cm infrared telescope flown in the Nasa-Ames Lear Jet (Aumann, Low and Gillespie 1970) was limited b...
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XMM-Newton background maps for the 3 EPIC instruments in their different instru-ment/mode/filter combinations and in several energy bands have been constructed using a superposition of 72 pointed observations. Event datasets, with point sources excised, for the different instrument/mode/filter combinations have also been assembled, with longer exposure times than previously available files. The...
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One of the key aspects of a detector material for space-borne hard X-ray and gamma-ray telescopes is the rate of prompt and delayed background events generated inside the material by charged and neutral particles striking the detector. These particles are Cosmic Rays, particles trapped in Earth’s magnetic field, and secondaries from Cosmic Ray interacting with the atmosphere and the spacecraft....
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Very high energy gamma-ray data obtained by CAT and HEGRA from active galactic nucleus Mkn 501 are used to constrain the cosmic Mid-Infrared background. While the entire infrared and submillimeter spectrum shape based on models has been fixed and the density scaled as a whole in previous studies, recent measures on the low and high energy infrared background are extensively used in this paper. ...
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ژورنال
عنوان ژورنال: Nature
سال: 1961
ISSN: 0028-0836,1476-4687
DOI: 10.1038/191840b0