Catalogue 4XMM-DR10s

4XMM-DR10s 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
xmmstack_v2.1_4xmmdr10s.fits.gz [1.1 GB]
in FITS format and browsable via the web-based interfaces

    • XSA at ESA’s XMM-Newton SOC

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 manually flagged 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