========================================================================== IX/56 3XMM-DR7s serendipitous source catalogue from stacks (Traulsen+, 2019) The following files can be converted to FITS (extension .fit or fit.gz) 3xmmdr7s.dat ========================================================================== Query from: http://vizier.u-strasbg.fr/viz-bin/VizieR?-source=IX/56 ==========================================================================
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Beginning of ReadMe : IX/56 3XMM-DR7s serendipitous source catalogue from stacks (Traulsen+, 2019) ================================================================================ The XMM-Newton serendipitous survey. VIII. The first XMM-Newton serendipitous source catalogue from overlapping observations. Traulsen I., Schwope A.D., Lamer G., Ballet J., Carrera F., Coriat M., Freyberg M.J., Michel L., Motch C., Rosen S.R., Webb N., Ceballos M.T., Koliopanos F., Kurpas J., Page M., Watson M.G. <Astron. Astrophys. 624, A77 (2019)> =2019A&A...624A..77T =2019yCat.9056....0T ================================================================================ ADC_Keywords: Surveys ; X-ray sources Mission_Name: XMM Keywords: catalogs - astronomical databases: miscellaneous - surveys - X-rays: general Abstract: XMM-Newton has observed the X-ray sky since the beginning of 2000. The XMM-Newton Survey Science Centre Consor-tium has been publishing catalogues of X-ray and ultraviolet sources found serendipitously in the individual observations. This series is now augmented by a catalogue dedicated to X-ray sources detected in spatially overlapping XMM-Newton observations. This catalogue aims at exploring repeatedly observed sky regions. It thus makes use of the long(er) effective exposure time per sky area and offers the opportunity to investigate long-term flux variability directly through the source detection process. A new standardised strategy for simultaneous source detection on multiple observations is introduced, including an adaptive-smoothing method to describe the image background. It is coded as a new task edetect_stack within the XMM-NewtonScience Analysis System and used to compile a catalogue of sources from 434 stacks comprising 1789 overlapping XMM-Newtonobservations that entered the 3XMM-DR7 catalogue and have a low background and full-frame readout of all EPIC cameras. The first stacked catalogue is called 3XMM-DR7s. It contains 71 951 unique sources with positions and source parameters like fluxes, hardness ratios, quality estimate, and information on inter-observation variability, which are directly derived from a simultaneous fit and calculated for the stack and for each contributing observation. More than 8 000 sources are new with respect to3XMM-DR7. By stacked source detection, the parameters of repeatedly observed sources can be determined with higher accuracy than in the individual observations. It is more sensitive to faint sources and tends to produce fewer spurious detections. With this first catalogue we demonstrate the feasibility and benefit of the approach. It supplements the large data base ofXMM-Newton detections by additional, in particular faint, sources and new variability information. In the future, it will be expanded to larger samples and continued within the series of serendipitous XMM-Newton source catalogues Description: The stacked catalogue 3XMM-DR7s has been compiled by the XMM-Newton Survey Science Centre (XMM-SSC) Consortium from overlapping XMM-Newton observations with low background and full-frame readout of all EPIC cameras. 1789 observations have been selected from the public observations taken between 2000 February 3 and 2016 December 15, which were used to generate the catalogue 3XMM-DR7, and sorted into 434 stacks. 3XMM-DR7s contains 71,951 unique sources and additional 216,393 rows with source parameters derived for all observations at the fitted position. The catalogue provides positions and source parameters like fluxes in the XMM-Newton standard energy bands, hardness ratios, quality estimate, and information on inter-observation variability. The parameters are directly derived from the simultaneous fit, and, wherever applicable, additionally calculated for each contributing observation. The aim of the catalogue is to explore the repeatedly observed sky regions and exploit their survey potential. It thus makes use of the long(er) effective exposure time per sky area and offers the opportunity to investigate long-term flux variability directly through the source detection process. Source parameters are given for the three EPIC instruments, abbreviated by PN, M1 (MOS1), and M2 (MOS2), and in the five standard energy bands (1) 0.2-0.5keV, (2) 0.5-1.0keV, (3) 1.0-2.0keV, (4) 2.0-4.5keV, and (5) 4.5-12.0keV. All-EPIC values cover the full energy range 0.2-12.0keV. Hardness ratios are calculated as (H-S)/(H+S) between energy bands H and S: HR1 between energy bands 2 and 1, HR2 between bands 3 and 2, HR3 between bands 4 and 3, and HR4 between bands 5 and 4, respectively. Coordinate equinox is J2000. Image pixels are binned to a side length of 4arcsec. The minimum detection likelihood to include a source in the catalogue is six in the whole stack or at least one contributing observation. A full description of the catalogue can be found at http://xmmssc.irap.omp.eu/Catalogue/3XMM-DR7s/3XMM_DR7stack.html Users of the catalogue are kindly asked to reference the catalogue paper (Traulsen+ 2019) and to include the following policy statement: "This research has made use of data obtained from the 3XMM XMM-Newton serendipitous stacked source catalogue 3XMM-DR7s compiled by the institutes of the XMM-Newton Survey Science Centre selected by ESA."