J/A+A/713/A299ivo://CDS.VizieR/J/A+A/713/A299CDSFinoguenov A.Seppi R.Eckert D.Khalil H.Kosowski J.Tempel E.,Gastaldello F.Lovisari L.2026-09-23T07:47:58Z2026-09-23T08:47:34ZCDS support team

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

cds-question@unistra.frgalaxy-clustersx-ray-sourcesredshiftedUnderstanding baryonic physics at the scale of galaxy groups is essential for high-precision cosmological studies of the large-scale structure. Most models predict that the intergalactic medium in groups is hot and extends well beyond the virial radius, emitting X-rays on scales of up to several degrees in nearby systems. Early X-ray searches using ROSAT showed significant promise in recovering and identifying this emission. We aim to exploit the large area coverage, good sensitivity, and low instrumental background of eROSITA to detect the faint surface brightness emission of galaxy groups from the Two Micron All Sky Survey Redshift Survey (2MRS). Using the data from eROSITA-DE Data Release 1, including images, exposure maps, and local background maps, we performed a wavelet decomposition of image mosaics in the 0.6-2.3keV band at angular scales of 1/8'-16'. We adopted 8-16' scales for source detection and 2'-4' scales to improve catalog purity. A novel identification method based on the ranked partial Hausdorff distance fully exploits the X-ray image and group membership information. Random catalogs were used to control match purity, and the identification threshold was chosen to maximize the catalog size at a fixed purity. We present a catalog of 619 X-ray galaxy groups with 80% purity, and define subsamples with 90% and 97% purity. Bright sources closely match the AXES-2MRS catalog (which is based on ROSAT All Sky Survey data analysis on spatial scales of 12'-24'). The X-ray luminosity function of our groups agrees with previous studies down to 5x10^41^erg/s. Using dynamical mass estimates, we find that the X-ray counterpart completeness for groups with >=4 members exceeds 60% for masses >2e13 Msun. We modeled the 2MRS group catalog and justify the inclusion of two-member groups in the identification. This study demonstrates that large X-ray sources on spatial scales relevant for cosmological studies of baryonic distributions can be reliably detected and identified using nearby galaxy group catalogs.2026A&A...713A.299Fhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/713/A299CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/682/A34 : SRG/eROSITA all-sky survey catalogs (eRASS1) (Merloni+, 2024)J/A+A/688/A210 : eRASS optical properties of clusters and groups (Kluge+, 2024)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/713/A299https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/713/A299http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/713/A299https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/713/A299https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/713/A299http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/713/A299GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/713/A299/catalog (Catalog of eRASS1 sources identified with 2MRS galaxy groups)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/713/A299/catalog?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/713/A299/catalog?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/713/A299/catalog?GETtext/xml+votable180.050000true124.1899327-70.64133180.0055555555555555566/4110 4214 4307 4373 4410 4447 4490-4491 4519-4520 4540 4616-4617 4647 4720 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26613-26614 26676 26710 26733 26764 26803 26816 26866-26867 26884 26904 26945 26951 26976 26987 27045 27060 27079 27160 27174 27208 27224 27248 27314 27350 27423 27486 27501 27505 27512 27566 27574 27606 27652 27714 27718 27722 27736 27738 27755 27803 28028 28035 28064 28075 28184 28252 28256 28275 28290 28300 28321 28326 28330 28345 28360 28377 28402 28414-28415 28443 28458 28471 28474 28494 28498 28515 28567 28599 28608-28609 29219 29223 32793 32887 32890 32897 32921 32937 32953 33058-33059 33233 33244 33264 33300 33341 33433 33469 33532 33562 33605 33620 33624 33638 33649 33662 33670 33812 33828 33835 33939 33951 33954 33959 33968 34037 34039 34071 34179 34229 34260 34423 34455 34463 34492 34517 34534 34703 34805 34955 34961 34967 34986 35052 35055 35242 35266 35291 35306 35360 35407 35437 35451 35456 35488 35536 35548 35591 35595 35608 35623 35689 35716 35719 35729 35763 35837 35854 35985 36012 36048 36062 36152 36231 36242 36247 36297 36408 36424 36474 36550 36618 36629 36645 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43918 43924 43937 43939 43941 43948 43954 43968 43971 43977-43978 43990 44005 44010 44017 44030 44162 44171 44180 44247 44271 44490 44550 44554 44585 44650 44693 44710 44776 44892 45006 45036 45131 45142 45227 45232 45284 45365 45389 45415 45446 45491 45523 45562 45566 45569 45574 45636 45754 45756 45780 45798 45852 45883 45893 45908 45951 45981 45984 45993 45997 46002 46004 46007 46020 46024 46043 46048 46196 46212 46219 46271 46314 46362 46441 46453 46474 46484 46515 46602 46608 46670 46735 46738 46756 47141 47215 47217 47331 47362 47397 47409 47444 47467 47538https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/713/A299?format=asciiX-raydefaultJ/A+A/713/A299/catalogCatalog of eRASS1 sources identified with 2MRS galaxy groupsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintCID8922X-ray contour ID (CID8922)meta.id;meta.mainlongLXX-ray luminosity in 0.1-2.4keV band (erg/s) (Lx)1e-07Wphys.luminosity;em.X-raydoublee_LXError on X-ray luminosity (eLx)1e-07Wstat.errordoubleR200cR200c (R200c)degphys.angSizefloatkTEstimated kT (kT)keVphys.energyfloatRap2R500Ratio of flux aperture to R500 (Rap2R500)phys.size.radius;arith.ratiofloatAcorAperture correction (Acor)instr.paramfloatKFCK and Flux Correction (KFC)arith.factor;phot.magfloatFlux0623Flux in 0.6-2.3keV band (erg/s/cm^2^) (Flux0623)mW.m**-2phot.flux;em.X-raydoublee_Flux0623flux error (eFlux0623)mW.m**-2stat.errordoubleRAJ2000FK5 right ascension (J2000) of X-ray peak (RA_peak)degpos.eq.ra;meta.mainDEJ2000FK5 declination (J2000) of X-ray peak (DEC_peak)degpos.eq.dec;meta.mainCRateCountrate (CNTR)ct/sphot.count;em.X-raydoublee_CRateError of countrate (eCNTR)ct/sstat.errordoubleReaminFlux aperture (Re_amin)arcminphys.angSizedoubleGrpId2MRS group ID (grpid)meta.id;pos.lgintNgalNumber of galaxies (ngal)meta.numberintRA2deg2MRS group center right ascension (J2000), FK5 (raj2000)degpos.eq.raDE2deg2MRS group center declination (J2000), FK5 (dej2000)degpos.eq.deczcmb2MRS group redshift in CMB frame (zcmb)src.redshiftdoubleM200Dynamical mass estimate mass_200)1e+12solMassphys.massdoublePurityPurity of identification (Expression: 0.97) (Purity)meta.code.qualfloat