J/other/NatAs/4.ivo://CDS.VizieR/J/other/NatAs/4.1072doi:10.26093/cds/vizier/dt/ekbahcCDSKaaret P.Koutroumpa D.Kuntz K.D.Jahoda K.Bluem J.Gulick H.,Hodges-Kluck E.LaRocca D.M.Ringuette R.Zajczyk A.2026-03-04T20:03:11Z2020-11-05T07:51:07ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frsurveysx-ray-sourcesinterstellar-mediumThe Milky Way galaxy is surrounded by a circumgalactic medium (CGM) that may play a key role in galaxy evolution as the source of gas for star formation and a repository of metals and energy produced by star formation and nuclear activity. The CGM may also be a repository for baryons seen in the early universe, but undetected locally. The CGM has an ionized component at temperatures near 2x10^6^K studied primarily in the soft X-ray band. Here we report a survey of the southern Galactic sky with a soft X-ray spectrometer optimized to study diffuse soft X-ray emission. The X-ray emission is best fit with a disc-like model based on the radial profile of the surface density of molecular hydrogen, a tracer of star formation, suggesting that the X-ray emission is predominantly from hot plasma produced via stellar feedback. Strong variations in the X-ray emission on angular scales of ~10 degrees indicate that the CGM is clumpy. Addition of an extended, and possibly massive, halo component is needed to match the halo density inferred from other observations.2020NatAs...4.1072Khttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/other/NatAs/4.1072CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/other/NatAs/4.1072https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/other/NatAs/4.1072http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/other/NatAs/4.1072https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/other/NatAs/4.1072https://vizier.iucaa.in/viz-bin/votable?-source=J/other/NatAs/4.1072http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/other/NatAs/4.1072GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/other/NatAs/4.1072/table1 (Observation details and spectral fit results)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/other/NatAs/4.1072/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/other/NatAs/4.1072/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/other/NatAs/4.1072/table1?GETtext/xml+votable180.050000true15.4569818.243870.0055555555555555566/91 134 388 609 2102 13328 16511 16708 16831 16960 17122 17293 17450 17528 17896 17990 18055 18167 18390 18478 18726 18771 18971 19135 19202 19320 19373 19567 19620 19812 19903 20047 21152 23208 23436 33462 33760 34159 34322 34495 34560 34646 34713 35009 35065 35264 35463 35570 35636 36034 36201 36363 36557 36630 36799 45168 45403 45451 45936 45955 46167 46221 46480 46557 46740 46842 46862 46969 47478 48373 48415 48646 48969https://cdsarc.cds.unistra.fr/viz-bin/moc/J/other/NatAs/4.1072?format=asciiX-raydefaultJ/other/NatAs/4.1072/table1Observation details and spectral fit resultsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintObsIDHaloSat observation IDmeta.id;obsintGLONGalactic longitudedegpos.galactic.lonGLATGalactic latitudedegpos.galactic.latExpTimeUsable exposure timestime.duration;obs.exposureintCashCash statisticstat.fit.paramfloatEMBest-fit halo emission measure0.001cm**-6.pc**-1phys.emissMeasure;meta.modelledfloate_EMError on emission measure (90% confidence)0.001cm**-6.pc**-1stat.errorfloatkTBest-fit halo temperaturekeVphys.temperaturefloate_kTError on halo temperature (90% confidence)keVstat.error;phys.energyfloatOLUSum of OVII+OVIII line emission (1)0.0001m**-2.s**-1.sr**-1phot.fluxfloate_OLUError on line emission (90% confidence)0.0001m**-2.s**-1.sr**-1stat.errorfloat_RA.icrsRight ascension (ICRS) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services)degpos.eq.ranullableindexed_DE.icrsDeclination (ICRS) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services)degpos.eq.decnullableindexed