M31 variable-W1 MOS annuli · technical visual QA

validated product snapshot

Five adjacent annuli, ten MOS spectra

All spectra are no-fit inspections from xsherpa.inspect.SpectrumInspector. Each annulus retains independent MOS1/MOS2 responses and QPB; the XMM images on this page are for spatial QA, not exposure-corrected or band-defined flux images.

5pure variable-W1 annuli

10MOS source/QPB/RMF/ARF sets

271,372validated source counts (MOS1+MOS2)

0fits / physical claims in this report

Interpretation boundary:Stored spectra span 0.3–7.2 keV; future MOS fitting must exclude 1.4–2.0 keV. The current obj-image-sky.fits has no PIMIN/PIMAX, so images check region/mask registration only.

Spatial-QA reference: purple is a=16–20′ and grey dashed curves are the other four report annuli. The image beneath each region card separately highlights its annulus and uses the camera-specific mask files for that extraction.

E015 · local data readiness

a=0–40′: local XMM footprint coverage

Each circle is the 15′ spherical FoV of a verified observation pointing: local ATTTSR median takes priority, followed by RA_PNT/DEC_PNT from same-OBSID local processed FITS, then XSA ra/dec. The cyan/pink contours are the actual 120-vertex variable-W1 FK5 annuli. WISE W1 is a WCS-reprojected display of the original FITS, not an X-ray exposure map.

Map inventory：187 root-directory rows contain 183 local directories (4 duplicate cross-root rows). All have verified coordinates: 72 ATTTSR, 103 local FITS, and 8 XSA. The map draws 111 within 90′ as complete 15′ circles. Of these, 76 intersect exact a≤40′ geometry; 35 do not (3 green clean-seed, 32 orange coordinate-only). The 76 intersecting fields separate 41 raw-ODF-ready from 35 coordinate-only records.

Geometry versus extraction gate：76 provenance-resolved local pointings provide 100.000% nominal 15′-FoV union in every serialized a=0–40′ annulus. This establishes disk geometry, not immediately extractable spectra: only 41 intersecting fields retain dual-MOS raw ODF and only OBSID 0112570101 has a direct dual-MOS clean seed. The other 35 must undergo retained-product audit and, where required, ODF/clean-event restoration before custom-region extraction. No column below includes CCD gaps, GTI, source masks, vignetting, or exposure; none is BACKSCAL / surface-brightness area.

Solid circles intersect a≤40′: green = direct clean seed, blue = retained dual-MOS raw ODF, purple = coordinate-resolved but no verified reduction seed. Dashed circles are nearby non-intersecting records. This is a local-data planning/provenance product, not a spectral fit or physical measurement.

Nominal 15′ FoV union over actual serialized annulus area (E015)
variable-W1 annulus	76 provenance-resolved fields	41 dual-MOS raw-ODF fields	existing 0112570101 clean seed
a=0–4′	100.000%	100.000%	100.000%
a=4–8′	100.000%	100.000%	100.000%
a=8–12′	100.000%	100.000%	100.000%
a=12–16′	100.000%	100.000%	91.917%
a=16–20′	100.000%	82.417%	52.440%
a=20–24′	100.000%	73.003%	38.164%
a=24–28′	100.000%	56.111%	25.904%
a=28–32′	100.000%	36.146%	17.778%
a=32–36′	100.000%	24.618%	11.749%
a=36–40′	100.000%	13.636%	5.838%

region-by-region inspection

Each region: spectrum + image + exact shape

Click a figure to enlarge it. The buttons at the upper right of each spectrum switch among the three xsherpa inspection units sb_flux, sb, and rate.

E009; 84/84 technical gates PASS

a=0–4′ · central variable-W1 annulus

xsherpa inspection spectrum

MOS1/MOS2 independently shown; 0.3–7.2 keV; group_subtracted_oversampling_SNR(rate=5,S/N=6); no fit/model curve.

Extraction image + exact region shape

Color fill is the report region; red/yellow circles are its camera-specific 80%-EEF point-source exclusions. This counts coadd is spatial QA only.

Validated product summary (0.3–7.2 keV extraction products)
Camera	Source counts	Particle QPB counts	Exposure (ks)	BACKSCAL area (arcmin²)
MOS1	60,244	1,096.727	58.180	28.882
MOS2	61,552	1,147.417	59.012	28.785

E011; 86/86 technical gates PASS

a=4–8′ · inner variable-W1 annulus

xsherpa inspection spectrum

MOS1/MOS2 independently shown; 0.3–7.2 keV; group_subtracted_oversampling_SNR(rate=5,S/N=6); no fit/model curve.

Extraction image + exact region shape

Color fill is the report region; red/yellow circles are its camera-specific 80%-EEF point-source exclusions. This counts coadd is spatial QA only.

Validated product summary (0.3–7.2 keV extraction products)
Camera	Source counts	Particle QPB counts	Exposure (ks)	BACKSCAL area (arcmin²)
MOS1	32,502	2,755.879	58.184	70.240
MOS2	35,879	2,932.051	59.021	71.977

E011; 86/86 technical gates PASS

a=8–12′ · outer variable-W1 annulus

xsherpa inspection spectrum

MOS1/MOS2 independently shown; 0.3–7.2 keV; group_subtracted_oversampling_SNR(rate=5,S/N=6); no fit/model curve.

Extraction image + exact region shape

Color fill is the report region; red/yellow circles are its camera-specific 80%-EEF point-source exclusions. This counts coadd is spatial QA only.

Validated product summary (0.3–7.2 keV extraction products)
Camera	Source counts	Particle QPB counts	Exposure (ks)	BACKSCAL area (arcmin²)
MOS1	20,511	4,381.942	58.197	106.520
MOS2	20,152	4,187.877	59.054	104.415

E014; 86/86 technical gates PASS

a=12–16′ · outer variable-W1 annulus I

xsherpa inspection spectrum

MOS1/MOS2 independently shown; 0.3–7.2 keV; group_subtracted_oversampling_SNR(rate=5,S/N=6); no fit/model curve.

Extraction image + exact region shape

Color fill is the report region; red/yellow circles are its camera-specific 80%-EEF point-source exclusions. This counts coadd is spatial QA only.

Validated product summary (0.3–7.2 keV extraction products)
Camera	Source counts	Particle QPB counts	Exposure (ks)	BACKSCAL area (arcmin²)
MOS1	11,195	3,369.454	58.203	81.982
MOS2	10,098	2,849.283	59.066	73.302

E014; 86/86 technical gates PASS

a=16–20′ · outer variable-W1 annulus II

xsherpa inspection spectrum

MOS1/MOS2 independently shown; 0.3–7.2 keV; group_subtracted_oversampling_SNR(rate=5,S/N=6); no fit/model curve.

Extraction image + exact region shape

Color fill is the report region; red/yellow circles are its camera-specific 80%-EEF point-source exclusions. This counts coadd is spatial QA only.

Validated product summary (0.3–7.2 keV extraction products)
Camera	Source counts	Particle QPB counts	Exposure (ks)	BACKSCAL area (arcmin²)
MOS1	9,659	2,730.155	58.188	67.434
MOS2	9,580	2,714.263	59.067	68.112

provenance & limits

Methods, QA, and next steps

Validated

All extraction products contain same-region source PHA, particle-QPB PHA, RMF, ARF, and OGIP links.
The E009 technical gates for a=0–4′ are 84/84 PASS; the E011/E014 gates for a=4–8′, a=8–12′, a=12–16′, and a=16–20′ are each 86/86 PASS.
DS9 geometry is parsed directly: the central region is a 120-vertex include polygon; an outer ring is a 120-vertex outer polygon minus a 120-vertex inner polygon.
Before MOS coaddition, image shape and the complete WCS must agree exactly; point masks require MOS1=92 and MOS2=90 !CIRCLE rows.

Not yet complete

No astrophysical sky-background model has been established; QPB cannot substitute for components such as LHB/MW halo/CXB.
No thermal model has been fit; therefore no temperature, metallicity, flux, or radial trend is reported.
One central pointing does not constitute a complete 0–40′ radial program and does not support a morphology/physical-origin claim.
The next scientific step is to define the sky-background + fitting scope, then assess whether 0.6–0.8 keV emission can be interpreted.