Bars In Disk-Dominated And Bulge-Dominated Galaxies At Z Similar To 0: New Insights From Similar To 3600 SDSS Galaxies

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dc.contributor.utaustinauthorBarazza, Fabio D.en_US
dc.contributor.utaustinauthorJogee, Shardhaen_US
dc.contributor.utaustinauthorMarinova, Irinaen_US
dc.creatorBarazza, Fabio D.en_US
dc.creatorJogee, Shardhaen_US
dc.creatorMarinova, Irinaen_US
dc.date.accessioned2016-04-28T22:21:45Z
dc.date.available2016-04-28T22:21:45Z
dc.date.issued2008-03en
dc.description.abstractWe present a study of large-scale bars in the local universe, based on a large sample of 3692 galaxies, with 18.5 <= M(g) < -22.0 mag and redshift 0.01 <= z < 0.03, drawn from the Sloan Digitized Sky Survey. Our sample includes many galaxies that are disk-dominated and of late Hubble types. Both color cuts and Se e rsic cuts yield a similar sample of similar to 2000 disk galaxies. We characterize bars and disks by ellipse-fitting r-band images and applying quantitative criteria. After excluding highly inclined (60 degrees) systems, we find the following results. (1) The optical r-band fraction (f(opt-r)) of barred galaxies, when averaged over the whole sample, is similar to 48%-52%. (2) When galaxies are separated according to half light radius (r(e)), or normalized r(e)/R(24), which is a measure of the bulge-to-disk (B/D) ratio, a remarkable result is seen: f(opt-r) rises sharply, from similar to 40% in galaxies that have small r(e)/R(24) and visually appear to host prominent bulges, to similar to 70% for galaxies that have large r(e)/R(24) and appear disk-dominated. (3) For galaxies with bluer colors, f(opt-r) rises significantly (by similar to 30%). A weaker rise (by similar to 15%-20%) is seen for lower luminosities or lower masses. (4) While hierarchical Lambda CDM models of galaxy evolution models fail to produce galaxies without classical bulges, our study finds that similar to 20% of disk galaxies appear to be "quasi-bulgeless.'' (5) We outline how the effect of a decreasing resolution and a rising obscuration of bars by gas and dust over z = 0.2-1.0 can cause a significant artificial loss of bars, and an artificial reduction in the optical bar fraction over z = 0.2-1.0.en_US
dc.description.departmentAstronomyen_US
dc.description.sponsorshipNASA NAG5-13063, HST-GO-10395, HST-GO-10428en_US
dc.description.sponsorshipNSF AST 06-07748en_US
dc.identifierdoi:10.15781/T2CZ38
dc.identifier.Filename2008_03_sdssgalaxies.pdfen_US
dc.identifier.citationBarazza, Fabio D., Shardha Jogee, and Irina Marinova. "Bars in Disk-dominated and Bulge-dominated Galaxies at z~ 0: New Insights from~ 3600 SDSS Galaxies." The Astrophysical Journal,Vol. 675, No. 2 (Mar., 2008): 1194.en_US
dc.identifier.doi10.1086/526510en_US
dc.identifier.issn0004-637Xen_US
dc.identifier.urihttp://hdl.handle.net/2152/35195
dc.language.isoEnglishen_US
dc.relation.ispartofen_US
dc.relation.ispartofserialAstrophysical Journalen_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.rights.restrictionOpenen_US
dc.subjectgalaxies : bulgesen_US
dc.subjectgalaxies : evolutionen_US
dc.subjectgalaxies : generalen_US
dc.subjectgalaxies :en_US
dc.subjectstructureen_US
dc.subjectcentral mass concentrationsen_US
dc.subjectbarred spiral galaxiesen_US
dc.subjectred-sequenceen_US
dc.subjectgalaxiesen_US
dc.subjectdeep field-northen_US
dc.subjectsecular evolutionen_US
dc.subjectstar-formationen_US
dc.subjectdark-matteren_US
dc.subjectdynamical frictionen_US
dc.subjectadvanced cameraen_US
dc.subjectstellar barsen_US
dc.subjectastronomy & astrophysicsen_US
dc.titleBars In Disk-Dominated And Bulge-Dominated Galaxies At Z Similar To 0: New Insights From Similar To 3600 SDSS Galaxiesen_US
dc.typeReviewen_US

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