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dc.creatorKoda, Jinen_US
dc.creatorMilosavljevic, Milosen_US
dc.creatorShapiro, Paul R.en_US
dc.date.accessioned2016-04-28T19:34:13Z
dc.date.available2016-04-28T19:34:13Z
dc.date.issued2009-05en
dc.identifierdoi:10.15781/T29B9Q
dc.identifier.citationKoda, Jun, Miloレ Milosavljevi?, and Paul R. Shapiro. "On the Survival and Abundance of Disk-dominated Galaxies." The Astrophysical Journal, Vol. 696, No. 1 (May., 2009): 254.en_US
dc.identifier.issn0004-637Xen_US
dc.identifier.urihttp://hdl.handle.net/2152/34770
dc.description.abstractWe study the formation of disk-dominated galaxies in a Lambda cold dark matter (Lambda CDM) universe. Their existence is considered to be a challenge for the Lambda CDM cosmology, because galaxy mergers isotropize stellar disks and trigger angular momentum transport in gas disks, thus fostering the formation of central stellar spheroids. Here, we postulate that the formation of stellar spheroids from gas-rich disks is controlled by two parameters that characterize galaxy mergers, the mass ratio of merging dark matter halos, and the virial velocity of the larger merging halo. We utilize merger histories generated from realizations of the cosmological density field to calculate the fraction of dark matter halos that have avoided spheroid formation, and compare the derived statistics with the spheroid occupation fractions in surveys of nearby galaxies. We find, for example, that the survival rate of disk-dominated galaxies in Lambda CDM is just high enough to explain the observed fractional representation of disk-dominated galaxies in the universe if the only mergers which lead to central spheroid formation are those with mass ratios M(2)/M(1) > 0.3 and virial velocities V(vir), 1 > 55 km s(-1). We discuss the physical origin of this criterion.en_US
dc.description.sponsorshipNSF AST-0708795, AST-0708176en_US
dc.description.sponsorshipNASA ATP NNG04G177G, NNX07AH09G, SAO TM8-9009Xen_US
dc.language.isoEnglishen_US
dc.relation.ispartofen_US
dc.rightsAdministrative deposit of works to Texas ScholarWorks: This works author(s) is or was a University faculty member, student or staff member; this article is already available through open access or the publisher allows a PDF version of the article to be freely posted online. The library makes the deposit as a matter of fair use (for scholarly, educational, and research purposes), and to preserve the work and further secure public access to the works of the University.en_US
dc.subjectcosmology: theoryen_US
dc.subjectgalaxies: formationen_US
dc.subjectgalaxies: spiralen_US
dc.subjectnuclear star-clustersen_US
dc.subjecttully-fisher relationen_US
dc.subjectdark-matter universeen_US
dc.subjectspiral galaxiesen_US
dc.subjectnumerical simulationsen_US
dc.subjectluminosity functionen_US
dc.subjectsecularen_US
dc.subjectevolutionen_US
dc.subjectangular-momentumen_US
dc.subjectmerger historiesen_US
dc.subjecthubble sequenceen_US
dc.subjectastronomy & astrophysicsen_US
dc.titleOn The Survival And Abundance Of Disk-Dominated Galaxiesen_US
dc.typeArticleen_US
dc.description.departmentAstronomyen_US
dc.identifier.Filename2009_05_survivalabundance.pdfen_US
dc.rights.restrictionOpenen_US
dc.identifier.doi10.1088/0004-637x/696/1/254en_US
dc.contributor.utaustinauthorKoda, Jinen_US
dc.contributor.utaustinauthorMilosavljevic, Milosen_US
dc.contributor.utaustinauthorShapiro, Paul R.en_US
dc.relation.ispartofserialAstrophysical Journalen_US


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