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SDSS-IV MaNGA : stellar angular momentum of about 2300 galaxies: unveiling the bimodality of massive galaxy properties

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Date
07/2018
Author
Graham, Mark T.
Cappellari, Michele
Li, Hongyu
Mao, Shude
Bershady, Matthew
Bizyaev, Dmitry
Brinkmann, Jonathan
Brownstein, Joel R.
Bundy, Kevin
Drory, Niv
Law, David R.
Pan, Kaike
Thomas, Daniel
Wake, David A.
Weijmans, Anne-Marie
Westfall, Kyle B.
Yan, Renbin
Keywords
Galaxies: elliptical and lenticular, cD
Galaxies: evolution
Galaxies: formation
Galaxies: kinematics and dynamics
Galaxies: spiral
QB Astronomy
QC Physics
3rd-DAS
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Abstract
We 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.
Citation
Graham , 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 . https://doi.org/10.1093/mnras/sty504
Publication
Monthly Notices of the Royal Astronomical Society
Status
Peer reviewed
DOI
https://doi.org/10.1093/mnras/sty504
ISSN
0035-8711
Type
Journal article
Rights
© 2018, Author(s). This work has been made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.1093/mnras/sty504
Description
AW acknowledges support of a Leverhulme Trust Early Career Fellowship.
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  • University of St Andrews Research
URL
http://adsabs.harvard.edu/abs/2018arXiv180208213G
https://arxiv.org/abs/1802.08213
URI
http://hdl.handle.net/10023/12810

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