Field content and target identification 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

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 14th November 2006 Ann-Marie Stobbart

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) 14th November 2006 Ann-Marie Stobbart

Observation classes: OBSFLAG=0 52% : no obvious spurious detections (may include one or two non-obvious ones) 14th November 2006 Ann-Marie Stobbart

Observation classes: OBSFLAG=1 30% : one or more spurious detections (but usually < 8 ) 14th November 2006 Ann-Marie Stobbart

Observation classes: OBSFLAG=2 0.9% : class 1 + missed detections in a group of very densely positioned sources 14th November 2006 Ann-Marie Stobbart

Observation classes: OBSFLAG=3 17% : not accepted for inclusion in the catalogue 14th November 2006 Ann-Marie Stobbart

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 ? 14th November 2006 Ann-Marie Stobbart

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 14th November 2006 Ann-Marie Stobbart

Field ID : Large extended SIMBAD PROPOSAL NED RA_PNT DEC_PNT XSA NGC 55 (WEST): 0028740101 : X-ray background and surveys 14th November 2006 Ann-Marie Stobbart

Field ID : Large extended SIMBAD PROPOSAL NED RA_PNT DEC_PNT XSA NGC 4258: 0059140401 : AGN, QSOs, BL-Lacs and XRB 14th November 2006 Ann-Marie Stobbart

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 14th November 2006 Ann-Marie Stobbart

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 14th November 2006 Ann-Marie Stobbart