Saoimage ds9 position fitting3/16/2023 ![]() ![]() The number of observations of a source ranges from 1 to 40. We find 288 191 sources of which 218 283 were observed several times. Most stacks are composed of two observations, the largest one comprises 352 observations. The new catalogue lists the X-ray sources detected in 1329 stacks with 6604 contributing observations over repeatedly covered 300 square degrees in the sky. Source fluxes were derived for all contributing observations, irrespective of whether the source would be detectable in an individual observation. The X-ray background maps used in source detection were modelled via an adaptive smoothing procedure with newly determined parameters. The high-background thresholds were determined through a statistical analysis of all exposures in each instrument configuration. Exposures with a high background were discarded. Observations with all filters and suitable camera settings were included. As a novel feature, positional rectification was applied beforehand. The 4XMM-DR9s catalogue was constructed from simultaneous source detection on overlapping observations. Stacking leads to a higher sensitivity, resulting in newly discovered sources and better constrained source parameters, and unveils long-term brightness variations. These observations are bundled in groups referred to as stacks. The catalogue described here, 4XMM-DR9s, explores sky areas that were observed more than once by XMM-Newton. In celebration of the twentieth anniversary of the XMM-Newton launch, the SSC has compiled the fourth generation of serendipitous source catalogues, 4XMM.Īims. The XMM-Newton Survey Science Centre Consortium (SSC) develops software in close collaboration with the Science Operations Centre to perform a pipeline analysis of all XMM-Newton observations. Mullard Space Science Laboratory, University College London, Holbury St Mary, Dorking, Surrey RH5 6NT, UKĭepartment of Physics & Astronomy, University of Leicester, Leicester LE1 7RH, UKĬontext. Observatoire astronomique, Université de Strasbourg, CNRS, UMR 7550, 11 rue de l’Université, 67000 Strasbourg, France Max-Planck-Institut für extraterrestrische Physik, Giessenbachstraße 1, 85748 Garching, Germany IRAP, Université de Toulouse, CNRS, UPS, CNES, 9 avenue du Colonel Roche, BP 44346, 31028 Toulouse Cedex 4, France Instituto de Física de Cantabria (CSIC-UC), Avenida de los Castros, 39005 Santander, Spain Leibniz-Institut für Astrophysik Potsdam (AIP), An der Sternwarte 16, 14482 Potsdam, GermanyĮ-mail: CEA, CNRS, Université Paris-Saclay, Université Paris Diderot, Sorbonne Paris Cité, 91191 Gif-sur-Yvette, France Astronomical objects: linking to databases.Including author names using non-Roman alphabets.Suggested resources for more tips on language editing in the sciences Punctuation and style concerns regarding equations, figures, tables, and footnotes ![]()
0 Comments
Leave a Reply.AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |