... ROSAT Explores The X-Ray Sky . ... Credit: S. Digel and S. Snowden ( USRA / LHEA / GSFC ), ROSAT Project , MPE, NASA Explanation: Launched in 1990, the orbiting ROSAT observatory explored the Universe by viewing the entire sky in x-rays -- photons with about 1,000 times more energy than visible light. ... The all-sky image is shown with the plane of our Milky Way Galaxy running horizontally through the center. ... Over large areas of the sky a general diffuse background of x-rays dominates. ...

... October 8, 1996 . ROSAT Explores the X-Ray Sky . ... Explanation: Launched in 1990, the orbiting ROSAT observatory explored the Universe by viewing the entire sky in x-rays - photons with about 1,000 times more energy than visible light . This ROSAT survey produced the sharpest, most sensitive image of the x-ray sky to date. The all-sky image is shown with the plane of our Milky Way Galaxy running horizontally through the center. ... About APOD | ...

... December 31, 1995 . The X-ray Sources of M31 . Credit: ROSAT , MPE , NASA . Explanation: Just like our own Milky Way Galaxy , the nearest major galaxy M31 has many star systems spewing high energy radiation . ... The X-ray sources in M31 occur in globular clusters , the spiral arms , and near the galaxy's center. ... M31 has more X-ray sources near its center than our Galaxy, and the reason for this is currently unknown. ... About APOD | ... NASA Technical Rep.: ...

Next: Catalog Construction Up: Observations and Analysis Previous: Source Detections . ... It was assumed that the highest signal gives the most likely position of the source. ... Comparing the summed map with the maps from the individual energy ranges, the one which produced the smallest error box was chosen to represent the source position, as long as was greater than 4, a level chosen to reflect a reasonable degree of confidence in the detection. ...

XMM-Newton Science Analysis System . ... A different approach is done via the setting withctisrcpos =Y: all event energy corrections do not use the actual RAWY coordinate but the corresponding RAWY location of the source ( SRCPOS ) as determined by the task epframes (either automatically or via setting withsrccoords =Y). ... The task epchain may be used with the setting ccds =4 withctisrcpos =Y to process only the CCD 4 where usually the bright source is located that causes the Out-of-Time events. ...

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... Virginia Kilborn's program gfinder was run on 388 luthered and edge-masked HIPASS cubes , covering the whole southern sky, over all 1024 channels (i.e. -1281 to 12741 km/s), with an HI peak flux cutoff of 60 mJy/beam. ... The large number of candidates is mostly due to artifacts generated in areas of strong continuum flux, mostly the Galactic Plane, (causing a baseline ripple), the HI emission in our Galaxy, and lots of interference (1408 MHz birdie, GPS etc.) ... Number of galaxies: . ... galaxies ...

... RJMCMC Similar to Richardson Green 1997 Knowledge of the PSF makes things easier Insensitive to e.g. posterior for ten sources with = 3: Number of Components 9 10 11 12 0.141 0.222 0.220 0.157 0.022 0.029 0.027 0.021 Mean SD 7 0.029 0.018 8 0.058 0.019 13 0.082 0.014 Simulated Data Source region (2 SD) is about 28% of the area and contains about 41% of the observations Positions (-2, 0), (0, 1), (1.5, 0) with intensities ... Approximate the number of sources (2 in this case) 2. ...

The form on this Web page allows specifying a celestial position for which the full 4x4 degree NVSS FITS image is desired. ... Other services of the NVSS survey include: . ... NVSS Postage stamp (small FITS or jpeg file) server . direct ftp to NVSS 4x4 deg. FITS image and documentation server . NVSS source catalog and software ftp server - but please note that you will need to schedule an overnight job for a quiet time slot to download the 150Mb CATALOG.FIT file to avoid timeouts etc. ...

... LABORATORY OF RADIO ASTRONOMICAL OBSERVATIONS . Radio sources identification is one of the most important tasks of the current radio astrophysics. ... Optical idetification. ... Optical identifications of subsample of steep spectra radio sources from RC catalog using 6m SAO telescope of SAO RAS: optical observations. ... Astronomy Reports. ... Identification of radio sources with data of various radio catalogs allows one to construct continual spectrum of the object and its radio structure. ...

We investigate the luminous X-ray sources in the Lockman Hole (LH) and the extended Groth strip (EGS) detected at 24 нјm using the Multiband Imaging Photometer (MIPS) and also with the Infrared Array Camera (IRAC) on board the Spitzer Space Telescope. We assemble optical/infrared spectral energy distributions (SEDs) for 45 X-ray/24 нјm sources in the EGS and LH. Only about one-quarter of the hard X-ray/24 нјm sources show pure type 1 active galactic nucleus (AGN) SEDs. ... ADS Citation Query . ...