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1、OntheEnergyRequiredtoEjectProcessedMatterfromGalaxiesSergiySilich1,2andGuillermoTenorio-Tagle1ABSTRACTWeevaluatetheminimumenergyinputratethatstarburstsrequireforexpellingtheirnewlyprocessedmatterfromtheirhostgalaxies.Specialattentionisgiventothepressurecaus
2、edbytheenvironmentinwhichagalaxyissituated,aswellastotheintrinsicrotationofthegaseouscomponent.Weaccountforthesefactorsandforamassivedarkmatterdistribution,anddevelopaself-consistentsolutionfortheinterstellarmattergasdistribution.Ourresultsareinexcellentagr
3、eementwiththeresultsofMacLow&Ferrara(1999)forgalaxieswithaflatteneddisk-likeISMdensitydistributionandalowintergalacticgaspressure(P/k≤1cm−3K).IGMHowever,oursolutionalsorequiresamuchlargerenergyinputratethresholdwhenonetakesintoconsiderationbothalargerinterga
4、lacticpressureandthepossibleexistenceofalow-density,non-rotating,extendedgaseoushalocomponent.Subjectheadings:ISM:bubbles,ISM:abundances,general-starburstgalaxies1.Introductionmumextent(Rh)anditscharacteristicscale(Rc).Theymadequantitativeconclusionsregardi
5、ngtheTheobservationalevidenceofpowerfulstar-energeticsrequiredfortheejectionofmetalsandburstsindwarfgalaxieshasledtotheideathat,oftheISM(”blow-away”)fromgalaxieswithanduetotheirrathershallowgravitationalpoten-ISMmassintherange(M=106-1010M).ISM⊙tial,supernov
6、a(SN)productsand,eventhewholeInnoneoftheabovementionedstudies,how-oftheinterstellarmedium(ISM),maybeeasilyever,havetherolesoftheextragalacticenviron-ejectedfromthehostdwarfsystems,causingthementnoroftherotationoftheinterstellargascontaminationoftheintra-clu
7、stermedium.Thisbeenexaminedinfulldetail.Meanwhile,Babulissuehasbeenaddressedinseveralpapers.De&Rees(1992)haveindicatedthattheextragalac-Young&Gallagher(1990)andDeYoung&Heck-ticmediumpressure(PIGM/k)mayvarybetweenman(1994)concludedthattypically1/6ofthe10−1an
8、d104cm−3K,makingitoneofthekeyarXiv:astro-ph/0101317v118Jan2001shock-wave’sswept-upmassmayescapeitshostparametersinthegalactic-extragalacticmediumgalaxy,andcoherentSNexplosionsmayevento-connection.tally
