XMM-Newton Science Analysis System . ... Meta Index / Home Page / General source table layout . For each filter there is a column for the parameterisation of the shapes of the sources (ie the semi-major, semi-minor axes and position-angle of the major axis). These values are the averaged values from the individual sources that were merged into a source. There are also columns giving the mean parameters for each source, which have been computed from the mean values for each filter. ...

Next: Photometry Up: Regions and Source Parameters Previous: *imcnts* - Find counts . This task (developed for use with optical images, but also useful with x-ray data) will quickly compute location, size, ellipticity, and position angle of sources. ... User can generate contour plots of any portion of the image and count rates in slices through the image. The program is advertised as ``quick [optical] photometry''. input file: rp110590_im1.imh . output file: logfile . ... Photometry . ...

... All the parameters provided in this database have been obtained using the the MIRIAD ( Sault et al. 1995 ) task MBSPECT . MBSPECT makes a spectrum of the velocity (or frequency) axis of a cube. The spectrum is beam-weighted, over the width specified, for the other image axes. ... Robust parameters are calculated by using an algorithm which minimises the mean absolute deviation of the flux-weighted velocities. mask= This specifies the x-axis ranges to be excluded from any continuum fit. ...

... User Guide ] Task: uvsfit Purpose: Fit point sources to a given vis file. ... You can reduce the data volume by averaging in frequency using the line parameter (apply bandpass first) or selecting a subset of the data. If you want to produce model or residual visibilities at full resolution for all the data, you can run UVSFIT again with all source parameters specified and fixed. ... Key: sspar This gives initial estimates of source spectral parameters. ... 1 The spectral term alpha1 is fixed. ...

... Impact of Covariance Information on the Orientation Parameters Between Radio Source Position Catalogs, IVS 2012 General Meeting Proceedings, p.339­341 http://ivscc.gsfc.nasa.gov/publications/gm2012/sokolova.pdf Impact of Covariance Information on the Orientation Parameters Between Radio Source ... IVS Analysis Centers provide these catalogs in a standard IERS format, where together with radio source positions and other relevant information, RA/DE correlations are reported. ...

... Computing the true count rates for digital data. ... The following equation is used to find the count rate. x = ( raw counts / sample time ) . ... True count rates for digital data are corrected by using the first equation for a point source and the second for an extended source. a = ( y - pre_amp - darkrate ) / ( highvolt x pt_effic ) . ... True photocurrents (count rates for analog data) are corrected by the first equation for point sources and the second equation for extended sources. ...

Next: Program use Up: Description of program searchdup Previous: Description of program searchdup . Parameter input is done with a graphic user interface. ... Input file: Name of the input catalog file. It has to be formatted, one record per source/observation, according to the format used in the Arcetri observations and source archives. ... Minimum number of observations per source Source with less than this number of independent observations are not included in the output file . ...

... Accurate positions of 404 compact radio sources used as calibrators by the VLA are presented. In addition, the structure and polarization of each source at both 4885 and 1465 MHz are given. ... Amplitude calibration was based on 3C286, whose fluxes at 4885 and 1465 MHz were assumed to be 7.41 and 14.41 Jy, respectively, in accord with the scale of Baars et al. (1977). short description of columns, as taken from the publication: . 1 source name . ... 8 Polarized flux at 4885 MHz (mJy) . ...