XMM-NEWTON · FORNAX CLUSTER · MOS1 + MOS2

Fornax
spectral atlas

An inspectable overview of 17 radial regions. Each spectrum comes from a saved independent SrcApec best fit, retaining one step best fit per data set, residuals, and a smooth total model.

SPECTRAL REGIONS

17all saved inspect products

FIT BAND

0.4–7.0keV · MOS only

INDEPENDENT y INPUTS

7non-overlapping primary annuli

Fornax XMM EPIC RGB WCS image with all radial regions overlaid — XMM EPIC-RGB HiPS FITS + Astropy WCS. Fine lines mark all analysis annuli; the pink dashed circle is the retained NGC 1399 centre and the red dashed circle excludes NGC 1404.

Current-analysis figures are derived from saved fit, inspection, or profile products; the literature panel uses only explicitly reported primary-paper values. This site neither reruns Sherpa fitting nor exposes PHA, response, or event files.

Important normalization correction · 2026-08-29

The earlier xsherpa port represented sky area as Const1D. Sherpa treats that term as energy-bin-width aware, adding ΔE≈0.005 and making the entire model about 200 times too faint. Every free normalization then grew by about 200, so relative agreement among ObsIDs, fitted count curves, and R-stat could all look good while the absolute EM, nₑ, y/Y scale was wrong. The current plots use the validated v18-style Python scalar sky-area multiplier and only corrected per-ObsID results.

01 · OVERVIEW

X-ray profiles

Overlapping regions are observational diagnostics; they do not automatically form independent three-dimensional shells.

02 · LITERATURE CHECK

Current measurements against public Fornax results

Temperature retains a point-by-point literature check; the current core comparison is matched-sample fixed-Z versus radial-Z EM, nₑ, and y, while literature density remains definition-limited context.

Comparison of current MOS projected temperatures with Murakami et al. 2011 XMM sector temperatures — Teal: current full-annulus MOS projected kT. Orange: original XMM single-temperature sector fits from Murakami et al. (2011). Bars retain their true radial spans rather than being re-averaged into points.

Comparison of fixed-metallicity and radial-metallicity-conditioned temperature, projected EM, electron density, and X-ray-inferred y — The branches use exactly the same accepted region/ObsID pairs; abundance is the only deliberately changed ICM parameter. Teal fixes Z=0.30; orange fixes each annulus to the radial-Z central value and reoptimizes kT, APEC norm, soft protons, and instrumental lines. R60–70 and R70–80 remain SrcApec source spectra; there is no R60–90 subtraction. R80–90 has no stable Z measurement and is excluded from both branches.

Fixed-metallicity and radial-metallicity-conditioned X-ray-inferred y and cumulative Y — Left: unconvolved X-ray-conditioned Compton y(θ). Right: Ycyl from 5′ to Θ, not total Y(<Θ). Both curves use the same 26 region/ObsID spectra in seven annuli. The pale band beyond 80′ is only the single-beta density plus smooth-temperature continuation; no y/Y uncertainty, SZ beam/transfer function, or Joel SZ-map curve is included.

Refit radial global metallicity measurements with 90% statistical intervals — Left: the 1T global Z (XSPEC angr) obtained by combining independent ObsID local profiles within the same annulus, retaining its true radial span and 90% interval. Right: every individual ObsID entering that joint result with its own 90% range; the teal diamond is the same joint value, not another spectral fit.

METALLICITY MEASUREMENT · 90% STATISTICAL INTERVALS

Metallicity: joint radial profile and individual-ObsID ranges

Each retained corrected scalar-skyarea MOS spectrum is first refit with broad Z bounds. Z is then fixed on both sides while kT, APEC norm, MOS instrumental lines, and soft protons are reoptimized. If a fixed-Z solution beats the free-Z solution, the fit restarts there so a local minimum is not presented as a measurement.

A radial point combines independent asymmetric local-quadratic profiles. Where the ObsID-to-ObsID scatter exceeds the statistical expectation, its joint interval is inflated by the recorded scatter factor. The table below identifies every grey point by ObsID, value, and endpoints so same-radius disagreement remains inspectable.

These are 90% local statistical intervals only for the 1T, frozen-sky, angr solar-ratio model. They exclude foreground/background, calibration, Fe/element-ratio, and multi-temperature projection systematics, and cannot be numerically exchanged with Murakami's Fe/Lodders values. The open lower side at R60–70 means the scan reaches Z=0; it is not a measurement of Z=0.

26 completed individual-ObsID profiles; 3 unstable profiles are not combined.

Joint and individual-ObsID values by annulus (90%) +

regionR5-10

R5–10

Joint result: Z=0.294; 90% [0.257, 0.318]; N=1

Inter-ObsID interval scale: 1.000

Individual ObsID results	ObsID	Z / Z⊙	90% lower	90% upper	MOS spectra
R5–10	0055140101	0.294	0.257	0.318	2

regionR10-20

R10–20

Joint result: Z=0.323; 90% [0.312, 0.334]; N=7

Inter-ObsID interval scale: 1.000

Individual ObsID results	ObsID	Z / Z⊙	90% lower	90% upper	MOS spectra
R10–20	0012830101	0.311	0.253	0.389	2
R10–20	0304940101	0.324	0.276	0.354	2
R10–20	0400620101	0.327	0.311	0.341	2
R10–20	0550930101	0.481	0.250	0.666	1
R10–20	0550931001	0.299	0.245	0.351	2
R10–20	0550931401	0.372	0.315	0.453	2
R10–20	0781350101	0.313	0.305	0.334	2

regionR20-30

R20–30

Joint result: Z=0.325; 90% [0.297, 0.355]; N=9

Inter-ObsID interval scale: 1.209

Individual ObsID results	ObsID	Z / Z⊙	90% lower	90% upper	MOS spectra
R20–30	0055140101	0.332	0.296	0.392	1
R20–30	0140950201	0.299	0.150	0.553	2
R20–30	0304940101	0.302	0.231	0.561	2
R20–30	0550930301	0.389	0.300	0.574	2
R20–30	0550930401	0.473	0.271	0.651	2
R20–30	0550930501	0.302	0.246	0.557	2
R20–30	0550931001	0.251	0.208	0.298	2
R20–30	0550931401	0.311	0.239	0.490	2
R20–30	0781350101	0.369	0.318	0.428	2

regionR30-40

R30–40

Joint result: Z=0.472; 90% [0.392, 0.566]; N=4

Inter-ObsID interval scale: 1.000

Individual ObsID results	ObsID	Z / Z⊙	90% lower	90% upper	MOS spectra
R30–40	0140950201	0.371	0.290	0.586	2
R30–40	0550930301	0.517	0.286	0.680	2
R30–40	0550930401	0.640	0.413	0.957	2
R30–40	0550930501	0.432	0.367	0.577	2

regionR40-50

R40–50

Joint result: Z=0.800; 90% [0.648, 1.000]; N=3

Inter-ObsID interval scale: 1.411

Individual ObsID results	ObsID	Z / Z⊙	90% lower	90% upper	MOS spectra
R40–50	0140950201	0.301	0.224	0.729	2
R40–50	0550930401	0.723	0.409	1.530	2
R40–50	0550930501	0.837	0.724	1.098	2

regionR60-70

R60–70

Joint result: Z=0.258; 90% [open (scan reaches 0), 0.319]; N=1

Inter-ObsID interval scale: 1.000

Individual ObsID results	ObsID	Z / Z⊙	90% lower	90% upper	MOS spectra
R60–70	0205590301	0.258	0.000	0.319	2

regionR70-80

R70–80

Joint result: Z=0.299; 90% [0.166, 0.371]; N=1

Inter-ObsID interval scale: 1.000

Individual ObsID results	ObsID	Z / Z⊙	90% lower	90% upper	MOS spectra
R70–80	0205590301	0.299	0.166	0.371	2

Unstable free-Z profiles not included in a joint result: R30–40 / 0550931001 · R40–50 / 0550930301 · R80–90 / 0205590301. They remained unstable after three side-probe restarts, so no interval is displayed and none enters a joint value.

SOURCES

Primary public references

Links lead to original papers; the scope each source can support is stated above.

Murakami et al. 2011, PASJ 63, S963 — direct XMM sector kT comparison and Table-3 Fe context.
Paolillo et al. 2002, ApJ 565, 883 — ROSAT-HRI multi-component density context; the plot traces its Figure-15 thick curve only as a definition-mismatched historical rendering, not as a matched density fit or ratio.
Su et al. 2017, ApJ 857, 116 — Chandra/XMM cold fronts and azimuthal thermodynamic structure.
Reiprich et al. 2025 — eROSITA surface-brightness extent; not a direct kT or projected-EM comparator.

03 · REGION BY REGION

Best-fit spectral atlas

Yellow region-design maps use the real FITS WCS. Spectra are in count s⁻¹ keV⁻¹ cm⁻² arcmin⁻².

R0–5 R0–10 R5–10 R5–15 R10–15 R10–20 R15–30 R20–30 R30–40 R30–50 R40–50 R60–70 R60–75 R60–90 R70–80 R75–90 R80–90

regionR0-5

R0–5

No retained MOS spectrum for the central aperture under the region-specific policy.

Legacy diagnostic fit (pre scalar-skyarea correction); not used by the current primary profile or y calculation.

Not used for current SZ

2 MOS spectra1 ObsIDskT 1.208 keVR-stat 11.39norm 2.08e-2 arcmin⁻²

Open region design and best-fit spectrum +

R0–5 on the XMM RGB WCS image — Yellow boundary：R0–5；grey marks other radial designs. Geometry source：region_mos_20260820/regionR0-5.reg。

R0–5 saved best-fit spectrum — Legacy grouped best-fit display retained as a diagnostic; its model normalization predates the scalar-skyarea correction.

ObsIDs 0055140101

regionR0-10

R0–10

Overlaps R5–10 and includes the unavailable central aperture.

Legacy diagnostic fit (pre scalar-skyarea correction); not used by the current primary profile or y calculation.

Not used for current SZ

13 MOS spectra7 ObsIDskT 1.290 keVR-stat 20.12norm 1.16e-2 arcmin⁻²

Open region design and best-fit spectrum +

R0–10 on the XMM RGB WCS image — Yellow boundary：R0–10；grey marks other radial designs. Geometry source：reconstructed from config/project_policy.json radial contract; original DS9 file not locally synced。

R0–10 saved best-fit spectrum — Legacy grouped best-fit display retained as a diagnostic; its model normalization predates the scalar-skyarea correction.

ObsIDs 0012830101 · 0055140101 · 0304940101 · 0400620101 · 0550931001 · 0550931401 · 0781350101

regionR5-10

R5–10

Non-overlapping primary annulus used by the preliminary y calculation.

Corrected scalar-skyarea per-ObsID annular median; displayed spread in the profile is the 16-84% cross-ObsID interval when N>1.

SZ primary

2 MOS spectra1 ObsIDskT 1.467 keVR-stat 0.90norm 4.06e-5 arcmin⁻²

Open region design and best-fit spectrum +

R5–10 on the XMM RGB WCS image — Yellow boundary：R5–10；grey marks other radial designs. Geometry source：region_mos_20260820/regionR5-10.reg。

R5–10 saved best-fit spectrum — The numeric primary-annulus summary is corrected. This legacy grouped spectrum image is retained only for visual diagnostics and is not the corrected model display.

ObsIDs 0055140101

regionR5-15

R5–15

Retained for spectral/profile inspection but not used as an independent y input.

Legacy diagnostic fit (pre scalar-skyarea correction); not used by the current primary profile or y calculation.

Diagnostic overlap

2 MOS spectra1 ObsIDskT 1.376 keVR-stat 1.24norm 6.61e-3 arcmin⁻²

Open region design and best-fit spectrum +

R5–15 on the XMM RGB WCS image — Yellow boundary：R5–15；grey marks other radial designs. Geometry source：region_mos_20260820/regionR5-15.reg。

R5–15 saved best-fit spectrum — Legacy grouped best-fit display retained as a diagnostic; its model normalization predates the scalar-skyarea correction.

ObsIDs 0055140101

regionR10-15

R10–15

Retained for spectral/profile inspection but not used as an independent y input.

Legacy diagnostic fit (pre scalar-skyarea correction); not used by the current primary profile or y calculation.

Diagnostic overlap

2 MOS spectra1 ObsIDskT 1.337 keVR-stat 1.37norm 5.87e-3 arcmin⁻²

Open region design and best-fit spectrum +

R10–15 on the XMM RGB WCS image — Yellow boundary：R10–15；grey marks other radial designs. Geometry source：region_mos_20260820/regionR10-15.reg。

R10–15 saved best-fit spectrum — Legacy grouped best-fit display retained as a diagnostic; its model normalization predates the scalar-skyarea correction.

ObsIDs 0055140101

regionR10-20

R10–20

Non-overlapping primary annulus used by the preliminary y calculation.

Corrected scalar-skyarea per-ObsID annular median; displayed spread in the profile is the 16-84% cross-ObsID interval when N>1.

SZ primary

13 MOS spectra7 ObsIDskT 1.370 keVR-stat 0.96norm 2.11e-5 arcmin⁻²

Open region design and best-fit spectrum +

R10–20 on the XMM RGB WCS image — Yellow boundary：R10–20；grey marks other radial designs. Geometry source：reconstructed from config/project_policy.json radial contract; original DS9 file not locally synced。

R10–20 saved best-fit spectrum — The numeric primary-annulus summary is corrected. This legacy grouped spectrum image is retained only for visual diagnostics and is not the corrected model display.

ObsIDs 0012830101 · 0304940101 · 0400620101 · 0550930101 · 0550931001 · 0550931401 · 0781350101

regionR15-30

R15–30

Retained for spectral/profile inspection but not used as an independent y input.

Legacy diagnostic fit (pre scalar-skyarea correction); not used by the current primary profile or y calculation.

Diagnostic overlap

6 MOS spectra3 ObsIDskT 1.261 keVR-stat 3.09norm 3.91e-3 arcmin⁻²

Open region design and best-fit spectrum +

R15–30 on the XMM RGB WCS image — Yellow boundary：R15–30；grey marks other radial designs. Geometry source：region_mos_20260820/regionR15-30.reg。

R15–30 saved best-fit spectrum — Legacy grouped best-fit display retained as a diagnostic; its model normalization predates the scalar-skyarea correction.

ObsIDs 0055140101 · 0140950201 · 0550930301

regionR20-30

R20–30

Non-overlapping primary annulus used by the preliminary y calculation.

Corrected scalar-skyarea per-ObsID annular median; displayed spread in the profile is the 16-84% cross-ObsID interval when N>1.

SZ primary

18 MOS spectra10 ObsIDskT 1.198 keVR-stat 0.95norm 1.44e-5 arcmin⁻²

Open region design and best-fit spectrum +

R20–30 on the XMM RGB WCS image — Yellow boundary：R20–30；grey marks other radial designs. Geometry source：reconstructed from config/project_policy.json radial contract; original DS9 file not locally synced。

R20–30 saved best-fit spectrum — The numeric primary-annulus summary is corrected. This legacy grouped spectrum image is retained only for visual diagnostics and is not the corrected model display.

ObsIDs 0055140101 · 0140950201 · 0304940101 · 0550930101 · 0550930301 · 0550930401 · 0550930501 · 0550931001 · 0550931401 · 0781350101

regionR30-40

R30–40

Non-overlapping primary annulus used by the preliminary y calculation.

Corrected scalar-skyarea per-ObsID annular median; displayed spread in the profile is the 16-84% cross-ObsID interval when N>1.

SZ primary

10 MOS spectra5 ObsIDskT 1.089 keVR-stat 1.06norm 7.04e-6 arcmin⁻²

Open region design and best-fit spectrum +

R30–40 on the XMM RGB WCS image — Yellow boundary：R30–40；grey marks other radial designs. Geometry source：reconstructed from config/project_policy.json radial contract; original DS9 file not locally synced。

R30–40 saved best-fit spectrum — The numeric primary-annulus summary is corrected. This legacy grouped spectrum image is retained only for visual diagnostics and is not the corrected model display.

ObsIDs 0140950201 · 0550930301 · 0550930401 · 0550930501 · 0550931001

regionR30-50

R30–50

Retained for spectral/profile inspection but not used as an independent y input.

Legacy diagnostic fit (pre scalar-skyarea correction); not used by the current primary profile or y calculation.

Diagnostic overlap

4 MOS spectra2 ObsIDskT 1.098 keVR-stat 1.45norm 8.72e-4 arcmin⁻²

Open region design and best-fit spectrum +

R30–50 on the XMM RGB WCS image — Yellow boundary：R30–50；grey marks other radial designs. Geometry source：region_mos_20260820/regionR30-50.reg。

R30–50 saved best-fit spectrum — Legacy grouped best-fit display retained as a diagnostic; its model normalization predates the scalar-skyarea correction.

ObsIDs 0140950201 · 0550930301

regionR40-50

R40–50

Non-overlapping primary annulus used by the preliminary y calculation.

Corrected scalar-skyarea per-ObsID annular median; displayed spread in the profile is the 16-84% cross-ObsID interval when N>1.

SZ primary

8 MOS spectra4 ObsIDskT 1.032 keVR-stat 1.10norm 3.45e-6 arcmin⁻²

Open region design and best-fit spectrum +

R40–50 on the XMM RGB WCS image — Yellow boundary：R40–50；grey marks other radial designs. Geometry source：reconstructed from config/project_policy.json radial contract; original DS9 file not locally synced。

R40–50 saved best-fit spectrum — The numeric primary-annulus summary is corrected. This legacy grouped spectrum image is retained only for visual diagnostics and is not the corrected model display.

ObsIDs 0140950201 · 0550930301 · 0550930401 · 0550930501

regionR60-70

R60–70

Non-overlapping primary annulus used by the preliminary y calculation.

Corrected scalar-skyarea per-ObsID annular median; displayed spread in the profile is the 16-84% cross-ObsID interval when N>1.

SZ primary

2 MOS spectra1 ObsIDskT 0.999 keVR-stat 1.10norm 1.12e-6 arcmin⁻²

Open region design and best-fit spectrum +

R60–70 on the XMM RGB WCS image — Yellow boundary：R60–70；grey marks other radial designs. Geometry source：region_mos_outer_split_20260821/regionR60-70.reg。

R60–70 saved best-fit spectrum — The numeric primary-annulus summary is corrected. This legacy grouped spectrum image is retained only for visual diagnostics and is not the corrected model display.

ObsIDs 0205590301

regionR60-75

R60–75

Retained for spectral/profile inspection but not used as an independent y input.

Legacy diagnostic fit (pre scalar-skyarea correction); not used by the current primary profile or y calculation.

Diagnostic overlap

2 MOS spectra1 ObsIDskT 0.948 keVR-stat 1.62norm 2.11e-4 arcmin⁻²

Open region design and best-fit spectrum +

R60–75 on the XMM RGB WCS image — Yellow boundary：R60–75；grey marks other radial designs. Geometry source：region_mos_outer_split_20260821/regionR60-75.reg。

R60–75 saved best-fit spectrum — Legacy grouped best-fit display retained as a diagnostic; its model normalization predates the scalar-skyarea correction.

ObsIDs 0205590301

regionR60-90

R60–90

Retained for spectral/profile inspection but not used as an independent y input.

Legacy diagnostic fit (pre scalar-skyarea correction); not used by the current primary profile or y calculation.

Diagnostic overlap

24 MOS spectra12 ObsIDskT 0.993 keVR-stat 1.70norm 1.75e-4 arcmin⁻²

Open region design and best-fit spectrum +

R60–90 on the XMM RGB WCS image — Yellow boundary：R60–90；grey marks other radial designs. Geometry source：reconstructed from config/project_policy.json radial contract; original DS9 file not locally synced。

R60–90 saved best-fit spectrum — Legacy grouped best-fit display retained as a diagnostic; its model normalization predates the scalar-skyarea correction.

ObsIDs 0151370101 · 0151370701 · 0205590301 · 0505140201 · 0505140401 · 0505140501 · 0692840201 · 0692840301 · 0692840401 · 0692840501 · 0924160101 · 0924160201

regionR70-80