منابع مشابه
ROSAT PSPC / HRI observations of the open cluster NGC 2422
We present the results of a ROSAT study of NGC 2422, a southern open cluster at a distance of about 470 pc, with an age close to the Pleiades. Source detection was performed on two observations, a 10-ksec PSPC and a 40-ksec HRI pointing, with a detection algorithm based on wavelet transforms, particularly suited to detecting faint sources in crowded elds. We have detected 78 sources, 13 of whic...
متن کاملSpatial corrections of ROSAT HRI observations
X-ray observations with the ROSAT High Resolution Imager (HRI) often have spatial smearing on the order of 10 (Morse 1994). This degradation of the intrinsic resolution of the instrument (5′′) can be attributed to errors in the aspect solution associated with the wobble of the space craft or with the reacquisition of the guide stars. We have developed a set of IRAF/PROS and MIDAS/EXSAS routines...
متن کاملROSAT HRI observations of radio-loud AGN
We present the results of three ROSAT HRI observations of AGN expected to reside in clusters of galaxies. Although the exposures were truncated by the premature end of the ROSAT mission, valuable information could be achieved which greatly improved upon the previous PSPC results. For RGB 1745+398 we could separate the cluster emission from that of the BL Lac and could confirm the cluster parame...
متن کاملDeep ROSAT HRI observations of the Pleiades
In a deep X-ray survey of the Pleiades open cluster, we use the ROSAT High Resolution Imager to explore a region of the cluster formerly surveyed with the PSPC. These new observations substantially improve upon both the sensitivity and the spatial resolution for this region of the Pleiades, allowing us to detect 18 cluster members not detected before and 16 members not included in the catalogs ...
متن کاملRosat Pspc Observations of the Richest (r ≥ 2) Aco Clusters
We have compiled an X-ray catalog of optically selected rich clusters of galaxies observed by the PSPC during the pointed GO phase of the ROSAT mission. This paper contains a systematic X-ray analysis of 150 clusters with an optical richness classification of R ≥ 2 from the ACO catalog (Abell, Corwin, and Olowin 1989). All clusters were observed within 45 of the optical axis of the telescope du...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Symposium - International Astronomical Union
سال: 1999
ISSN: 0074-1809
DOI: 10.1017/s0074180900204324