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Field content and target identification

20 th Survey Science Centre Consortium meeting. Field content and target identification. Ann-Marie Stobbart Anja Schroeder, Mike Watson and the XMM-Newton Survey Science Centre. 2XMMp : selecting observations.

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Field content and target identification

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  1. 20th Survey Science Centre Consortium meeting Field content and target identification Ann-Marie Stobbart Anja Schroeder, Mike Watson and the XMM-Newton Survey Science Centre

  2. 2XMMp: selecting observations • 2XMMp contains a subset of the total number of observations to be included in the final 2XMM catalogue. • Subset selected via visual screening of each observation + sources + automatic flags •  Quick field identifications based on the number of ‘spurious’ detections i.e. those NOT automatically flagged as spurious Ann-Marie Stobbart

  3. 2XMMp: selecting observations • Observations classified into one of four quality flags (OBSFLAG=0-3) •  ‘Good’ observations (OBSFLAG=0-2) included • i.e. those with no or few obvious spurious detections (83% public observations with EPIC data) Ann-Marie Stobbart

  4. Observation classes: OBSFLAG=0 52% : no obvious spurious detections (may include one or two non-obvious ones) Ann-Marie Stobbart

  5. Observation classes: OBSFLAG=1 30% : one or more spurious detections (but usually < 8 ) Ann-Marie Stobbart

  6. Observation classes: OBSFLAG=2 0.9% : class 1 + missed detections in a group of very densely positioned sources Ann-Marie Stobbart

  7. Observation classes: OBSFLAG=3 17% : not accepted for inclusion in the catalogue Ann-Marie Stobbart

  8. Field identification • 2XMMp screening effectively independent of target itself • 2XMM Serendipitous catalogue • Aim for 2XMM is to classify XMM-Newton fields by the type of target within them • But, is the target: • a single object ? • a whole field ? • extended ? Ann-Marie Stobbart

  9. Field identification • 5 proposed field classifications: • Point source • Extended source • Small extended • Large extended • Field (e.g. The Lockman Hole) • Not detected (e.g. OM calibration field) • Unknown Ann-Marie Stobbart

  10. Field ID : Large extended SIMBAD PROPOSAL NED RA_PNT DEC_PNT XSA NGC 55 (WEST): 0028740101 : X-ray background and surveys Ann-Marie Stobbart

  11. Field ID : Large extended SIMBAD PROPOSAL NED RA_PNT DEC_PNT XSA NGC 4258: 0059140401 : AGN, QSOs, BL-Lacs and XRB Ann-Marie Stobbart

  12. Target identification • Aim to flag the target of the observation • Difficulties, e.g. for galaxies  no source to flag unambiguously • Simplest solution  flag the targets from the ‘point source’ field classification Ann-Marie Stobbart

  13. Summary • 2XMMp screening: quick field identifications  83% public observations included • Aim for 2XMM: field and target identifications  work in progress • Difficulties: • Finding a position that best identifies the target in order to classify the field • finding an unambiguous target position in order to flag the target Ann-Marie Stobbart

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