the luminosity function of the coma cluster core for -25m_r-11new

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1、Revision2.4,submittedtoAJTheLuminosityFunctionoftheComaClusterCorefor−25

2、fChicago,5460S.EllisAve.,Chicago,IL60637Electronicmail:nichol@huron.uchicago.eduJ.A.Tyson1AT&TBellLaboratories,Room1D432,MurrayHill,NJ07974Electronicmail:tyson@physics.att.comM.P.Ulmer1Dept.ofPhysicsandAstronomy,NorthwesternUniversity,Evanston,IL60208Electr

3、onicmail:ulmer@ossenu.astro.nwu.eduandD.WittmanStewardObservatory,UniversityofArizona,Tucson,AZ85721arXiv:astro-ph/9503102v128Mar1995Electronicmail:dwittman@as.arizona.eduABSTRACTWedeterminetheluminosityfunction(LF)ofgalaxiesinthecoreoftheComaclusterforM≤−1

4、1.4(assumingH=75kms−1Mpc−1),amagnitudeR0regimepreviouslyexploredonlyintheLocalGroup.ObjectsarecountedinadeepCCDimageofComahavingRMSnoiseof27.7Rmagarcsec−2.AcorrectionforobjectsintheforegroundorbackgroundoftheComacluster—andtheuncertaintyinthiscorrection—are

5、determinedfromimagesoffiveother1VisitingAstronomer,KittPeakNationalObservatory–2–high-latitudefields,carefullymatchedtotheComaimageinbothresolutionandnoiselevel.AccuratecountsofComaclustermembersareobtainedasfaintasR=25.5,orMR=−9.4.TheLFforgalaxiesiswellfitbya

6、powerlawdN/dL∝Lα,withα=−1.42±0.05,overtherange−19.4

7、subjectedtomorphologicalselection,andthelimitingdetectionisophoteis27.6Rmagarcsec−2.WefindthetypicalM≈−12ComaclustergalaxytoRhaveanexponentialscalelength≈200pc,similartoLocalGroupgalaxiesofcomparablemagnitude.Theseextremedwarfgalaxiesshowasurfacedensityincre

8、asingtowardsthegiantellipticalNGC4874asr−1.3,similartothediffuselightandglobularclusterdistributions.Theluminosityinthedetecteddwarfgalaxiesisatmostafewpercentofthetotaldiffuselightofthegiantgalaxiesinth