Show simple item record

Files in this item


Item metadata

dc.contributor.authorGraham, Mark T.
dc.contributor.authorCappellari, Michele
dc.contributor.authorLi, Hongyu
dc.contributor.authorMao, Shude
dc.contributor.authorBershady, Matthew
dc.contributor.authorBizyaev, Dmitry
dc.contributor.authorBrinkmann, Jonathan
dc.contributor.authorBrownstein, Joel R.
dc.contributor.authorBundy, Kevin
dc.contributor.authorDrory, Niv
dc.contributor.authorLaw, David R.
dc.contributor.authorPan, Kaike
dc.contributor.authorThomas, Daniel
dc.contributor.authorWake, David A.
dc.contributor.authorWeijmans, Anne-Marie
dc.contributor.authorWestfall, Kyle B.
dc.contributor.authorYan, Renbin
dc.identifier.citationGraham , M T , Cappellari , M , Li , H , Mao , S , Bershady , M , Bizyaev , D , Brinkmann , J , Brownstein , J R , Bundy , K , Drory , N , Law , D R , Pan , K , Thomas , D , Wake , D A , Weijmans , A-M , Westfall , K B & Yan , R 2018 , ' SDSS-IV MaNGA : stellar angular momentum of about 2300 galaxies: unveiling the bimodality of massive galaxy properties ' , Monthly Notices of the Royal Astronomical Society , vol. 477 , no. 4 , pp. 4711-4737 .
dc.identifier.otherBibCode: 2018arXiv180208213G
dc.identifier.otherORCID: /0000-0002-5908-6852/work/45366215
dc.descriptionAW acknowledges support of a Leverhulme Trust Early Career Fellowship.en
dc.description.abstractWe measure λRe, a proxy for galaxy specific stellar angular momentum within one effective radius, and the ellipticity, ϵ, for about 2300 galaxies of all morphological types observed with integral field spectroscopy as part of the MaNGA survey, the largest such sample to date. We use the (λRe,ϵ) diagram to separate early-type galaxies into fast and slow rotators. We also visually classify each galaxy according to its optical morphology and two-dimensional stellar velocity field. Comparing these classifications to quantitative λRe measurements reveals tight relationships between angular momentum and galaxy structure. In order to account for atmospheric seeing, we use realistic models of galaxy kinematics to derive a general approximate analytic correction for λRe. Thanks to the size of the sample and the large number of massive galaxies, we unambiguously detect a clear bimodality in the (λRe,ϵ) diagram which may result from fundamental differences in galaxy assembly history. There is a sharp secondary density peak inside the region of the diagram with low λRe and ϵ < 0.4, previously suggested as the definition for slow rotators. Most of these galaxies are visually classified as non-regular rotators and have high velocity dispersion. The intrinsic bimodality must be stronger, as it tends to be smoothed by noise and inclination. The large sample of slow rotators allows us for the first time to unveil a secondary peak at +/-90 degrees in their distribution of the misalignments between the photometric and kinematic position angles. We confirm that genuine slow rotators start appearing above a stellar mass of 2 x 1011 M⊙ where a significant number of high-mass fast rotators also exist.
dc.relation.ispartofMonthly Notices of the Royal Astronomical Societyen
dc.subjectGalaxies: elliptical and lenticular, cDen
dc.subjectGalaxies: evolutionen
dc.subjectGalaxies: formationen
dc.subjectGalaxies: kinematics and dynamicsen
dc.subjectGalaxies: spiralen
dc.subjectQB Astronomyen
dc.subjectQC Physicsen
dc.titleSDSS-IV MaNGA : stellar angular momentum of about 2300 galaxies: unveiling the bimodality of massive galaxy propertiesen
dc.typeJournal articleen
dc.contributor.sponsorThe Leverhulme Trusten
dc.contributor.institutionUniversity of St Andrews. School of Physics and Astronomyen
dc.description.statusPeer revieweden

This item appears in the following Collection(s)

Show simple item record