... bvd=0/ . 2011-10-26 20:49 . ... nethned=0/ . ... vth=0.001/ . ... vth=0.1c/ . ...

XMM-Newton Science Analysis System . ... Meta Index / Home Page This section documents the parameters recognized by this task (if any). ... set . yes . ... frame exposuretimes below this value are flagged as bad (sec) . ... Add column with number of raw pixels per frame to EXPOSURE table . ... mark frames with more pixels above given level as bad . ... frames with more pixels than this level are flagged bad . ... 9999. 0. frames with a raw pixelrate above this level are flagged bad (pixels/sec) . ...

... Basic algorithms for the production of stellar photometry from CCD observations are described and reviewed. ... The problem of doing accurate stellar photometry with calibrated charge-coupled device (CCD) data amounts to that of condensing the intensity values of hundreds, thousands, or even millions of picture elements (pixels) into a list containing the magnitude and position of each star on the CCD image. ... Center an aperture of N A pixels on the star. ... PIXEL.LT.PEAKMAX)) THEN BINGO = .TRUE....

... Computation: RJMCMC Similar to Richardson Green 1997 Knowledge of the PSF makes things easier Insensitive to the prior on k e.g. posterior when k = 10 and = 3: Posterior of number of sources (k) 8 9 10 11 12 0.058 0.141 0.222 0.220 0.157 0.019 0.022 0.029 0.027 0.021 Mean SD 7 0.029 0.018 13 0.082 0.014 Used posterior probabilities given by 10 chains 6 / 30 Example Region occupied by the three ... 28 / 30 XMM data spectral distribution 29 / 30 Four models 30 / 30 ...

... 4 Finally use casa or Obit for imaging B. Nikolic , J. S. Richer , R. E. Hills Introduction / Overview Detailed radiometer modelling System Simulations Configurations 50 500 5000 y (m) y (m) 0 0 y (m) 0 -50 -500 -5000 -1000 -50 0 x (m) 50 -1000 -500 0 x (m) 500 -5000 0 x (m) 5000 B. Nikolic , J. S. Richer , R. E. Hills Introduction / Overview Detailed radiometer modelling System ... B. Nikolic, J. S. Richer, R. E. Hills ...

... Image Quality of the VLT . Total Optical Control . First light for the ESO VLT unit telescope 1 occurred during the workshop. ... The image shown (Figure 1 ) here was obtained with the VLT on May 16, 1998, in red light (R band), i.e. while the mirror was still uncoated. ... In this diagram (FIgure 2), the measured image quality of the VLT UT1 astronomical images is plotted versus the ``seeing", as measured by the Seeing Monitor, a small telescope also located on top of the Paranal Mountain. ...

... That star is called Sirius, and it is the brightest star in Earth's nighttime sky. ... But the other reason Sirius is so brilliant in our nighttime sky is that it is so close; Sirius is the nearest neighbor star to the Sun that can be seen with the unaided eye from the Northern Hemisphere. ... and even the nearest other star (alpha Centauri, visible from the Southern Hemisphere) would be 6,000 miles away. ... Sun . ... For example, alpha Centauri is the brightest star in the constellation Centaurus....

... Tonight's Sky . ... space flight . ... space physics . ... Integral challenges physics beyond Einstein . The gamma-ray observatory has placed stringent new limits on the size of quantum т??grainsт?? in space, ruling out some quantum loop gravity theories. ... The European Space Agencyт??s (ESA) Integral gamma-ray observatory has provided results that will dramatically affect the search for physics beyond Einstein. ... Only registered members of Astronomy.com are allowed to comment on this article. ...

Apache's support for content negotiation has been updated to meet the HTTP/1.1 specification. It can choose the best representation of a resource based on the browser-supplied preferences for media type, languages, character set and encoding. ... Content-Language: . ... The reason for setting this language quality factor for variant with no language to a very low value is to allow for a default variant which can be supplied if none of the other variants match the browser's language preferences. ...