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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
SDSS-IV MaNGA: Stellar angular momentum of about 2300 galaxies: Unveiling the bimodality of massive galaxy properties
Monthly Notices of the Royal Astronomical Society, Volume 477, No. 4, Year 2018
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Description
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 Mapping Nearby Galaxies at Apache Point Observatory 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° in their distribution of the misalignments between the photometric and kinematic position angles. We confirm that genuine slow rotators start appearing aboveM= 2 × 1011M⊙ where a significant number of high-mass fast rotators also exist. © The Author(s) 2018.
Authors & Co-Authors
Cappellari, Michele
United Kingdom, Oxford
University of Oxford
Li, Hongyu
China, Beijing
Chinese Academy of Sciences
China, Beijing
University of Chinese Academy of Sciences
Mao, Shude
China, Beijing
Chinese Academy of Sciences
China, Beijing
Tsinghua University
United Kingdom, Manchester
The University of Manchester
Bershady, Matthew A.
United States, Madison
University of Wisconsin-madison
Bizyaev, Dmitry Anatolevich
Russian Federation, Moscow
Lomonosov Moscow State University
United States, Las Cruces
New Mexico State University
Brinkmann, Jonathan V.
United States, Las Cruces
New Mexico State University
Brownstein, Joel R.
United States, Salt Lake City
The University of Utah
Bundy, Kevin A.
United States, Santa Cruz
University of California, Santa Cruz
Drory, Niv
United States, Austin
The University of Texas at Austin
Law, David R.
United States, Baltimore
Space Telescope Science Institute
Pan, Kaike
Russian Federation, Moscow
Lomonosov Moscow State University
Thomas, Daniel B.
United Kingdom, Portsmouth
University of Portsmouth
Wake, David A.
United States, Asheville
The University of North Carolina at Asheville
United Kingdom, Milton Keynes
The Open University
Weijmans, Anne Marie
United Kingdom, St Andrews
University of st Andrews
Westfall, Kyle B.
United States, Santa Cruz
University of California, Santa Cruz
Yan, Renbin
United States, Lexington
University of Kentucky
Statistics
Citations: 105
Authors: 16
Affiliations: 17
Identifiers
Doi:
10.1093/mnras/sty504
ISSN:
00358711
Study Design
Cross Sectional Study
Study Approach
Quantitative