eFEDS survey area
eFEDS survey area
位于western sky，距M31超过105°。
In the western sky, more than 105 degrees from M31.
Figure 3 · study file
G. Ponti et al.（2023）论文档案
G. Ponti et al. (2023) study file
Abundance and temperature of the outer hot circumgalactic medium
Ponti et al.利用eFEDS深场分解外层MW hot-CGM emission，并显式比较negligible与high-SWCX两种固定情景。Figure 3保留两个情景点，不构造central value。
Ponti et al. decompose outer Milky-Way hot-CGM emission in the eFEDS field and explicitly compare fixed negligible- and high-SWCX scenarios. Figure 3 retains both scenario points without inventing a central value.
DOI 10.1051/0004-6361/202243992
Source snapshot: arXiv:2210.03133v1 · 2026-07-15T10:49:33ZSHA-256 a7d0a29bd8b54a24b0ba42063ffd8add4c3863d3a7d6347e62fee3594a5bc06b
先看三张讲解图
Start with the three talk figures
先建立视觉主线；讲稿中的Figure 1–3与这里的顺序严格一致。
Establish the visual story first; Figure 1–3 cues in the talk track follow this exact order.
eFEDS fixed scenarios在线性plane中
eFEDS fixed scenarios in the linear plane
两条紫色guide分别对应high与negligible SWCX；它们是离散systematic scenarios，不是一个连续prior band。
The two purple guides correspond to high and negligible SWCX. They are discrete systematic scenarios, not a continuous prior band.
PDF
log view中的common-band位置
Common-band position in the log view
log plane显示两套eFEDS values低于observed line-of-sight total，但这种数值关系不消除105°sky separation。
The log plane shows both eFEDS values below the observed line-of-sight total, but that numerical relation does not erase the 105-degree sky separation.
PDF
从Table 4分裂能段到共同band
From split Table 4 bands to the common band
stacked bars把published 0.6–2.0 flux与model-retained 0.5–0.6 slice分开；下表绑定各情景kT、Z、soft fraction与最终值。两列是fixed scenarios，不是confidence interval。
Stacked bars separate the published 0.6–2.0 flux from the model-retained 0.5–0.6 slice. The table binds each scenario to kT, Z, soft fraction, and final value. The two columns are fixed scenarios, not a confidence interval.
PDF5-minute presentation · speaker-ready
一句话结论
One-sentence take-home
Ponti et al.在远离M31的eFEDS深场给出negligible与high-SWCX两套固定系统情景。把Table 4重建到absorbed 0.5–2.0 keV后得到0.406510与0.291208；这两个值是共同band中的distant-sky scenarios，不是一个central value的confidence interval，也不是M31方向prior。
Ponti et al. provide fixed negligible- and high-SWCX systematic scenarios in the eFEDS deep field, far from M31. Reconstructing Table 4 in absorbed 0.5–2.0 keV gives 0.406510 and 0.291208. These are distant-sky scenarios in a common band, not a confidence interval around one central value and not a prior toward M31.
统一单位：除非另行注明，Figure 3面亮度均为absorbed 0.5–2.0 keV，单位10−15 erg cm−2 s−1 arcmin−2。Common unit: unless noted otherwise, Figure 3 surface brightnesses are absorbed 0.5–2.0 keV in 10−15 erg cm−2 s−1 arcmin−2.
先记住这六个数字
Six numbers to remember
0.3–0.6 keV CGM bins
0.3–0.6 keV CGM bins
negligible/high SWCX；单位10^-13 erg cm^-2 s^-1 deg^-2。
Negligible/high SWCX in 10^-13 erg cm^-2 s^-1 deg^-2.
0.6–2.0 keV CGM bins
0.6–2.0 keV CGM bins
Table 4原生published values。
Native published values from Table 4.
negligible-SWCX重建
Negligible-SWCX reconstruction
absorbed 0.5–2.0 keV common-band value。
Absorbed 0.5–2.0 keV common-band value.
high-SWCX重建
High-SWCX reconstruction
不是下限或error bar端点。
Not a lower limit or an error-bar endpoint.
采用的column spread
Adopted column spread
跟随PDF/arXiv；publisher HTML Eq. 1显示0.177。
Following PDF/arXiv; publisher HTML Eq. 1 displays 0.177.
五分钟逐段讲稿
Five-minute talk track
按时间顺序讲；每段先说粗体标题，再用图或数字支撑，不需要另查论文。
Follow the timing in order. State each heading first, then support it with the figure or number; no paper lookup is required.
科学角色
Scientific role
eFEDS不是M31附近control field，而是一个深的distant-sky comparator。它的价值是展示SWCX treatment如何改变同一field中的hot-CGM component，并为共同0.5–2.0 keV轴提供两套明确情景。
eFEDS is not a control field near M31; it is a deep distant-sky comparator. Its value is to show how SWCX treatment changes the hot-CGM component in one field and to provide two explicit scenarios on the common 0.5–2.0 keV axis.
原文测量与模型
Native measurement and model
eROSITA/eFEDS约107.5 deg² spectroscopy联合拟合unabsorbed Local Hot Bubble、吸收后的CGM、CXB与SWCX。Table 4按0.3–0.6、0.6–2.0和0.3–2.0 keV报告CGM component surface brightness。
eROSITA/eFEDS spectroscopy over about 107.5 square degrees jointly fits an unabsorbed Local Hot Bubble, absorbed CGM, CXB, and SWCX. Table 4 reports CGM-component surface brightness in 0.3–0.6, 0.6–2.0, and 0.3–2.0 keV.
两列不是error interval
The two columns are not an error interval
negligible与high SWCX是固定systematic scenarios。0.3–0.6 keV分别为24.1/15.6，0.6–2.0 keV为5.6/4.9。connector只把两套模型归组，不能称为一个measurement的confidence range。
Negligible and high SWCX are fixed systematic scenarios. Their 0.3–0.6 keV values are 24.1/15.6 and their 0.6–2.0 keV values are 5.6/4.9. A connector only groups the two models; it is not a confidence range for one measurement.
common-band重建
Common-band reconstruction
0.5 keV切在Table 4 soft bin内部，因此用published kT/Z的Lodders APEC和lognormal N_H quadrature求F(0.5–0.6)/F(0.3–0.6)，再与published 0.6–2.0 flux相加并从deg²换到arcmin²。
Because 0.5 keV cuts through the published soft bin, a Lodders APEC model at the published kT/Z plus lognormal N_H quadrature supplies F(0.5–0.6)/F(0.3–0.6). That piece is added to the published 0.6–2.0 flux and converted from square degrees to square arcminutes.
结果与边界
Result and boundary
重建值为high/negligible SWCX=0.291208/0.406510。eFEDS距M31超过105°，没有M31 geometry transfer，也没有localization依据；安全结论仅是不同SWCX情景下的远方sky comparator范围。
The reconstructed high/negligible-SWCX values are 0.291208/0.406510. eFEDS is more than 105 degrees from M31, with no M31 geometry transfer or localization basis. The safe conclusion is only a distant-sky comparator under different SWCX scenarios.
从论文到M31 Figure 3
From the paper to M31 Figure 3
Table 4
Table 4
两套SWCX情景的published bins
Published bins for two SWCX scenarios
F_0.3–0.6, F_0.6–2.0soft-bin split
Soft-bin split
APEC+disnht重建0.5–0.6
APEC plus disnht reconstructs 0.5–0.6
r = F_0.5–0.6/F_0.3–0.6band sum
Band sum
加回published 0.6–2.0
Add the published 0.6–2.0 bin
F_0.5–2 = rF_soft + F_hardsolid angle
Solid angle
deg^-2转arcmin^-2
Convert deg^-2 to arcmin^-2
÷3600scenario pair
Scenario pair
保留两个离散值
Retain two discrete values
0.291208 / 0.406510Detailed audit below
以下是逐项provenance与解释边界
Itemized provenance and interpretation boundaries follow
仪器与数据
Instrument and data
eROSITA/eFEDS X-ray survey spectroscopy over约107.5 deg2；分析利用不同survey epochs检查SWCX，并联合建模热前景、CGM、CXB和吸收。
eROSITA/eFEDS X-ray survey spectroscopy over about 107.5 deg2, using different survey epochs to diagnose SWCX and jointly modeling thermal foregrounds, CGM, CXB, and absorption.
观测视线与样本域
Sightlines and sample domain
eFEDS位于约l=220-235 deg、b=20-40 deg的西侧天空，离M31超过105 deg。它是一个远方sky comparator，不是M31足迹测量或可局部化到M31的空间模型。
eFEDS lies in the western sky near l=220-235 deg and b=20-40 deg, more than 105 deg from M31. It is a distant-sky comparator, not an M31-footprint measurement or a spatial model localizable to M31.
原文测量量
Native measurement
Table 4给出best-fitting CGM component surface brightness：0.3-0.6、0.6-2.0和0.3-2.0 keV，单位1e-13 erg cm-2 s-1 deg-2。左右列分别是negligible/high SWCX固定模型。
Table 4 reports best-fitting CGM-component surface brightness in 0.3-0.6, 0.6-2.0, and 0.3-2.0 keV, in 1e-13 erg cm-2 s-1 deg-2. Left/right columns are fixed negligible/high SWCX models.
原文模型
Published model
模型包含unabsorbed Local Hot Bubble、吸收后的CGM thermal component、CXB和SWCX情景；neutral-column distribution用disnht。PDF/arXiv给出sigma=0.117，而publisher HTML Eq.1显示0.177；转换采用PDF/arXiv的0.117。
The model includes an unabsorbed Local Hot Bubble, absorbed CGM thermal component, CXB, and SWCX scenarios, with disnht for the neutral-column distribution. The PDF/arXiv give sigma=0.117 while publisher HTML Eq. 1 shows 0.177; the transfer follows the PDF/arXiv value 0.117.
原文结果
Published results
Table 4的CGM值为negligible/high SWCX：0.3-0.6 keV 24.1/15.6，0.6-2.0 keV 5.6/4.9。两列是系统情景，不是同一参数的置信区间。
Table 4 gives CGM values for negligible/high SWCX of 24.1/15.6 in 0.3-0.6 keV and 5.6/4.9 in 0.6-2.0 keV. The two columns are systematic scenarios, not a confidence interval on one parameter.
如何进入M31 Figure 3
Transfer into M31 Figure 3
对每个SWCX情景，用published kT/Z的Lodders APEC和lognormal-N_H quadrature计算F(0.5-0.6)/F(0.3-0.6)，乘Table 4 soft-bin flux后与published 0.6-2.0 flux相加，再换算deg2到arcmin2。得到high/negligible SWCX=0.291208/0.406510。这里没有M31几何transfer，只有common-band重建。
For each SWCX scenario, a Lodders APEC model at the published kT/Z plus lognormal-N_H quadrature gives F(0.5-0.6)/F(0.3-0.6). That fraction of the Table 4 soft-bin flux is added to the published 0.6-2.0 flux and deg2 is converted to arcmin2, yielding high/negligible SWCX values of 0.291208/0.406510. This is a common-band reconstruction, not an M31 geometry transfer.
假设与解释边界
Assumptions and boundaries
eFEDS与M31不共线；两个点的连接线只表示固定SWCX情景范围。Table 4没有把该值定义为M31方向的absorbed prior。
eFEDS is not co-directional with M31. The connector between its two points only groups fixed SWCX scenarios. Table 4 does not define an absorbed prior toward M31.
全天 (l, b) 覆盖图
All-sky (l, b) coverage map
紫色矩形代表 eFEDS 约 107.5 deg² 视场（l=220-235°, b=20-40°），红色五角星标 M31。eFEDS 离 M31 超过 105°，只作为 distant-sky comparator，不在 M31 footprint 上。
The purple rectangle marks the eFEDS field of about 107.5 deg² at l=220-235°, b=20-40°. The red star marks M31. eFEDS is more than 105° from M31 and serves only as a distant-sky comparator, not an M31-footprint measurement.
PDF本论文对应的Figure 3数据点
Figure 3 points from this study
eFEDS negligible-SWCX scenario
0.406510 [0.406510, 0.406510]
固定SWCX scenario；不是central estimate或CI。
A fixed SWCX scenario, not a central estimate or confidence interval.
eFEDS high-SWCX scenario
0.291208 [0.291208, 0.291208]
固定SWCX scenario；与另一点的connector不是error bar。
A fixed SWCX scenario; its connector to the other point is not an error bar.
Primary-source证据地图
Primary-source evidence map
| Location | Claim | Link |
|---|---|---|
| Table 4 | Disjoint CGM component fluxes in the two SWCX scenarios. | primary source |
| Table 2 and Sect. 5.4 | Negligible/high SWCX scenario definitions and model components. | primary source |
| Version-of-record PDF Eq. 1 | disnht width sigma=0.117 used by the executable reconstruction. | primary source |