Bulges Of Nearby Galaxies With Spitzer: Scaling Relations In Pseudobulges And Classical Bulges

dc.contributor.utaustinauthorFisher, David B.en_US
dc.creatorFisher, David B.en_US
dc.creatorDrory, Niven_US
dc.date.accessioned2016-04-28T19:43:35Z
dc.date.available2016-04-28T19:43:35Z
dc.date.issued2010-06en
dc.description.abstractWe investigate scaling relations of bulges using bulge-disk decompositions at 3.6 mu m and present bulge classifications for 173 E-Sd galaxies within 20 Mpc. Pseudobulges and classical bulges are identified using Sersic index, Hubble Space Telescope morphology, and star formation activity ( traced by 8 mu m emission). In the near-IR pseudobulges have n(b) < 2 and classical bulges have n(b) > 2, as found in the optical. Sersic index and morphology are essentially equivalent properties for bulge classification purposes. We confirm, using a much more robust sample, that the Sersic index of pseudobulges is uncorrelated with other bulge structural properties, unlike for classical bulges and elliptical galaxies. Also, the half-light radius of pseudobulges is not correlated with any other bulge property. We also find a new correlation between surface brightness and pseudobulge luminosity; pseudobulges become more luminous as they become more dense. Classical bulges follow the well-known scaling relations between surface brightness, luminosity, and half-light radius that are established by elliptical galaxies. We show that those pseudobulges (as indicated by Sersic index and nuclear morphology) that have low specific star formation rates are very similar to models of galaxies in which both a pseudobulge and classical bulge exist. Therefore, pseudobulge identification that relies only on structural indicators is incomplete. Our results, especially those on scaling relations, imply that pseudobulges are very different types of objects than elliptical galaxies.en_US
dc.description.departmentAstronomyen_US
dc.description.sponsorshipUniversity of Texas at Austinen_US
dc.description.sponsorshipMax-Planck Societyen_US
dc.identifierdoi:10.15781/T2C54Q
dc.identifier.Filename2010_06_spitzer.pdfen_US
dc.identifier.citationFisher, David B., and Niv Drory. "Bulges of nearby galaxies with Spitzer: scaling relations in pseudobulges and classical bulges." The Astrophysical Journal, Vol. 716, No. 2 (Jun., 2010): 942.en_US
dc.identifier.doi10.1088/0004-637x/716/2/942en_US
dc.identifier.issn0004-637Xen_US
dc.identifier.urihttp://hdl.handle.net/2152/35172
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: formationen_US
dc.subjectgalaxies:en_US
dc.subjectfundamental parametersen_US
dc.subjectgalaxies: structureen_US
dc.subjectlate-type spiralsen_US
dc.subjectdisk galaxiesen_US
dc.subjectsecular evolutionen_US
dc.subjectstar-formationen_US
dc.subjectelliptic galaxiesen_US
dc.subjectstructural-propertiesen_US
dc.subjectgalactic bulgesen_US
dc.subjectstellaren_US
dc.subjectpopulationen_US
dc.subjectfundamental planeen_US
dc.subjectbarred galaxiesen_US
dc.subjectastronomy & astrophysicsen_US
dc.titleBulges Of Nearby Galaxies With Spitzer: Scaling Relations In Pseudobulges And Classical Bulgesen_US
dc.typeArticleen_US

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