Catalogue 4XMM-DR10s

4XMM-DR19s logo

The 4XMM-DR10s catalogue of serendipitous sources from overlapping XMM-Newton observations has been compiled from 1 396 groups, comprising 7 803 overlapping good-quality XMM-Newton observations. They were selected from the public observations taken between 2000 February 3 and 2019 December 14 which overlap by at least one arcminute in radius and are not affected by very high background emission. It contains 335 812 unique sources, 218 283 of them multiply observed, with 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 catalogue aims at exploring the multiply observed sky regions and exploit their survey potential, in particular to study the long-term behaviour of X-ray emitting sources. It thus makes use of the long(er) effective exposure time per sky area and offers the opportunity to investigate flux variability directly through the source detection process. The main catalogue properties are summarised in the table below, the data processing and the stacked source detection are described in the processing summary. Updates compared to the previous version include a significantly larger sample of observations, event-based astrometric corrections before running source detection, revised background parameters, and manually set flags marking obviously spurious detections. Please be aware of the watchout regarding missing quality flags of six sources.

The catalogue is available for download as a single file

in FITS format and browsable via the web-based interfaces

The XSA provides access to the auxiliary data products per source: a broad-band X-ray image, a colour-coded three-band X-ray image, an optical finding chart, and a long-term X-ray light curve.

Catalogue overview

   4XMM-DR10s    4XMM-DR9s    3XMM-DR7s
Number of stacks 1 396 1 329 434
Number of observations 7 803 6 604 1 789
First observation included 2000/02/03 2000/02/03 2000/02/20
Last observation included 2019/12/14 2018/11/13 2016/04/02
Approximate sky coverage 540 sq. deg. 485 sq. deg. 150 sq. deg.
Approximate multiply observed sky area 335 sq. deg. 300 sq. deg. 100 sq. deg.
Total number of sources 335 812 288 191 71 951
Sources with several contributing observations 256 213 218 283 57 665
Multiply observed sources with flag 0 or 1 216 699 191 497 55 450
Multiply observed and flagged manually 24 296 19 224
Multiply observed with a total detection likelihood of at least six 208 921 181 132 49 935
Multiply observed with a total detection likelihood of at least ten 176 680 153 487 42 077
Multiply observed point sources with VAR_PROB≤1% and flag 0 or 1 21 672 20 588 5 358
Multiply observed point sources with VAR_PROB≤ 10–5 and flag 0 or 1 7 728 7 478 1 839
Maximum number of observations per source 65 40 23
Maximum on-time per source 2.8 Ms 1.9 Ms 1.3 Ms

Watchout

Quality flags of six sources are incomplete / undefined in 4XMM-DR10s due to an I/O error. Their STACK_FLAG is -1 or #null, their boolean flags (EP_FLAG, PN_FLAG, M1_FLAG, M2_FLAG) are partly not set. The updated values are listed in the table below for the stack (no OBS_ID given) and all contributing observations. They will be included in the next catalogue release 4XMM-DR11s (in 2021).

IAUNAME SRCID OBS_ID STACK_FLAG EP_FLAG PN_FLAG M1_FLAG M2_FLAG
4XMMs J022412.3-042336   3011268050104416   0 FFFFFFFFFF   FFFFFFFFF   FFFFFFFFF   FFFFFFFFF  
4XMMs J022412.3-042336   3011268050104416   0112680501   0 FFFFFFFFFF   FFFFFFFFF   FFFFFFFFF   FFFFFFFFF  
4XMMs J022412.3-042336   3011268050104416   0210490101   0 FFFFFFFFFF   FFFFFFFFF   FFFFFFFFF   FFFFFFFFF  
4XMMs J022412.3-042336   3011268050104416   0780450601   0 FFFFFFFFFF   FFFFFFFFF   FFFFFFFFF   FFFFFFFFF  
4XMMs J053600.0-051742   3009300010103925   1 TFFFFFFFFF   FFFFFFFFF   TFFFFFFFF   FFFFFFFFF  
4XMMs J053600.0-051742   3009300010103925   0093000101   1 TFFFFFFFFF   FFFFFFFFF   TFFFFFFFF   FFFFFFFFF  
4XMMs J053600.0-051742   3009300010103925   0093000301   1 TFFFFFFFFF   FFFFFFFFF   TFFFFFFFF   FFFFFFFFF  
4XMMs J053600.0-051742   3009300010103925   0112590301   0 FFFFFFFFFF   FFFFFFFFF   FFFFFFFFF   FFFFFFFFF  
4XMMs J053600.0-051742   3009300010103925   0134531601   0 FFFFFFFFFF   FFFFFFFFF   FFFFFFFFF   FFFFFFFFF  
4XMMs J053600.0-051742   3009300010103925   0134531701   0 FFFFFFFFFF   FFFFFFFFF   FFFFFFFFF   FFFFFFFFF  
4XMMs J053754.1-064724   3050356060103246   1 FFTFFFFFFF   FFTFFFFFF   FFTFFFFFF   FFTFFFFFF  
4XMMs J053754.1-064724   3050356060103246   0503560601   1 FFTFFFFFFF   FFTFFFFFF   FFTFFFFFF   FFTFFFFFF  
4XMMs J054050.0-080606   3050356020102802   0 FFFFFFFFFF   FFFFFFFFF   FFFFFFFFF   FFFFFFFFF  
4XMMs J054050.0-080606   3050356020102802   0503560201   0 FFFFFFFFFF   FFFFFFFFF   FFFFFFFFF   FFFFFFFFF  
4XMMs J054050.7-080553   3050356020102801   0 FFFFFFFFFF   FFFFFFFFF   FFFFFFFFF   FFFFFFFFF  
4XMMs J054050.7-080553   3050356020102801   0503560201   0 FFFFFFFFFF   FFFFFFFFF   FFFFFFFFF   FFFFFFFFF