The ROSAT Mission
نویسندگان
چکیده
منابع مشابه
The ROSAT Deep Surveys
The ROSAT Deep Survey in the Lockman Hole is the most sensitive X–ray survey performed to date, encompassing an exposure time of 200 ksec with the PSPC and 1.2 Msec with the HRI. The source counts reach a density of ∼ 1000 deg at a limiting flux of ∼ 10 erg cm s. At this level 70–80% of the 0.5–2 keV X–ray background is resolved into discrete sources. Because of the excellent HRI positions, 83 ...
متن کاملThe ROSAT Deep Survey
An unusual double-lobed extended X-ray source (RX J105343+5735) is detected in the ROSAT ultra-deep HRI image of the Lockman Hole. The angular size of the source is 1.7× 0.7 arcmin and its X-ray flux is 2 × 10 erg cm s. R-band imaging from the Keck telescope revealed a marginal excess of galaxies brighter than R=24.5, but Keck LRIS spectroscopy of 24 objects around the X-ray centroid did not yi...
متن کاملThe second ROSAT PSPC survey of M31 and the complete ROSAT PSPC source list
This paper reports the results of the analysis of the second ROSAT PSPC survey of M31 performed in summer 1992. We compare our results with those of the first survey, already published in Supper et al. (1997). Within the ∼ 10.7 deg field of view, 396 individual X-ray sources are detected in the second survey data, of which 164 are new detections. When combined with the first survey, this result...
متن کاملCommentary Analysis of the Verses of the Prophetic Mission Reward
The holy Quran has a two-way remark about the request of reward of the prophets' mission. Narrated from the prophets and the last of the prophets (p.b.u.h), some of the verses have negated the demanding of the mission wages on the prophets' part and have taken it into account as a specific thing to the lofty God while in some verses such as 53 Furqan, 43 Saba', and 23 Shura, wage and reward is ...
متن کاملThe ROSAT Bright Survey: I. Identification of an AGN sample with hard ROSAT X-ray spectra
The ROSAT Bright Survey (RBS) aims to completely optically identify the more than 2000 brightest sources detected in the ROSAT all-sky survey at galactic latitudes |b| > 30◦ (excluding LMC, SMC, Virgo cluster). This paper presents a subsample of 66 bright point-like ROSAT survey sources with almost hard PSPC spectra, the hardness ratio HR1 is > 0.5 for most of the sources. The subsample could b...
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ژورنال
عنوان ژورنال: International Astronomical Union Colloquium
سال: 1990
ISSN: 0252-9211
DOI: 10.1017/s0252921100012483