update on the xmm slew survey richard saxton 1, m. pilar esquej 1 andy read 2, michael freyberg 3,...

Update on the XMM Slew Update on the XMM Slew SurveySurvey

Richard SaxtonRichard Saxton11, M. Pilar Esquej, M. Pilar Esquej11

Andy ReadAndy Read22, Michael Freyberg, Michael Freyberg33, Bruno , Bruno AltieriAltieri11, ,

11 ESAC ESAC22 University of Leicester, U.K. University of Leicester, U.K.33 MPE, Garching, Germany MPE, Garching, Germany

3

Status summaryStatus summaryo Finished processing for 15% of sky (revs 314-980)Finished processing for 15% of sky (revs 314-980)o 5200 (5200 (33003300) sources detected in total, soft and/or hard band with ) sources detected in total, soft and/or hard band with

det_ml>8 (det_ml>8 (1010))o 845 in hard band (845 in hard band (426426))o Significant number of spurious detections (see later)Significant number of spurious detections (see later)o Some overlap: 105 sources seen in more than one slewSome overlap: 105 sources seen in more than one slewo Mean positional error ~8”Mean positional error ~8”o Plan to release catalogue, via the XSA (v2.9) and as FITS file at end Plan to release catalogue, via the XSA (v2.9) and as FITS file at end

of Feb or March. of Feb or March.

Outstanding Work: • Identification of counterparts• Removal/assessment of spurious sources

IdentificationsIdentificationsCross-correlated source list with Simbad, NED, HEASARC.Also working with the GAVO cross-matching tool to find the most likely optical/2MASS/radio counterparts.Found counterparts for 55% of sources.

Represented categories:AGN: 500Galaxies: 750Clusters/groups : 80Active stars: 80SNR: 12LMXB: 16HMXB: 3WD: 2

HB89 0642+449(Z=3.4)

Correlations with ROSATCorrelations with ROSAT 55% of sources correlate with ROSAT (non-extended, DET_ML>10) 1% show variability by > factor of ten

Mean rate XMM/ROSAT =10

Spurious detectionsSpurious detectionsExtended source: mainly due to SNR

Halo of bright source: mainly LMXB

High Background: indistinguishable from extended source, 30s flare = 45’ diameter “remnant”.

Optical loading:

Large/Bright Extended SourcesLarge/Bright Extended Sources

XMM slew ROSAT HRI

Sources found in Puppis-A

Bright sourceBright source

High backgroundHigh background

Many sources due to background flare

Optical loadingOptical loading

Only important for the very brightestStars.

Sirius

Hard sourcesHard sources After removing spurious sources due to the effects mentioned After removing spurious sources due to the effects mentioned

before, we are left with 707 hard sources but expect only ~400-before, we are left with 707 hard sources but expect only ~400-500 from previous ln-n/ln-s work.500 from previous ln-n/ln-s work.

Hints that sources may be related to background levelHints that sources may be related to background level

Extended sourcesExtended sources15% of sources extended15% of sources extendedAssociations with 81 zwicky/Abell clustersAssociations with 81 zwicky/Abell clusters

Galaxy ClustersGalaxy Clusters

Sensitive to relatively faint clusters thanks to wide band-passand low background.

Gallery of famous clusters

A 2029A 2029

Also famous SNR

VELA

ConclusionsConclusions

Expect to make catalogue public in 1-2 monthsExpect to make catalogue public in 1-2 months Battling with spurious sources. How many ?, Battling with spurious sources. How many ?,

which ones ?, where to cut in parameter space ?which ones ?, where to cut in parameter space ? Making progress with identificationsMaking progress with identifications Many high-z detectionsMany high-z detections Interesting Rosat/XMM variability Interesting Rosat/XMM variability Potentially interesting extended sourcesPotentially interesting extended sources Project starting this year to provide an upper-Project starting this year to provide an upper-

limits server for slew images as part of XSAlimits server for slew images as part of XSA