期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 462, 期 4, 页码 3955-3978出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stw1913
关键词
galaxies: dwarf; galaxies: evolution; galaxies: kinematics and dynamics
资金
- University of Portsmouth
- Leverhulme Early Career Fellowship
- World Premier International Research Center Initiative (WPI Initiative), MEXT, Japan
- Spanish Ministry of Economy and Competitiveness (MINECO) [AYA2013-48226-C3-1-P]
- FP7 Marie Curie Actions of the European Commission via Initial Training Network DAGAL under REA grant [289313]
- NSF [AST 1517006]
- Alfred P. Sloan Foundation
- U.S. Department of Energy Office of Science
- Center for High-Performance Computing at the University of Utah
- Brazilian Participation Group
- Carnegie Institution for Science
- Carnegie Mellon University
- Chilean Participation Group
- French Participation Group
- Harvard-Smithsonian Center for Astrophysics
- Instituto de Astrofisica de Canarias
- Johns Hopkins University
- Kavli Institute for the Physics and Mathematics of the Universe (IPMU) / University of Tokyo, Lawrence Berkeley National Laboratory
- Leibniz Institut fur Astrophysik Potsdam (AIP)
- Max-Planck-Institut fur Astronomie (MPIA Heidelberg)
- Max-Planck-Institut fur Astrophysik (MPA Garching)
- Max-Planck-Institut fur Extraterrestrische Physik (MPE)
- National Astronomical Observatory of China
- New Mexico State University
- New York University
- University of Notre Dame
- Observatario Nacional / MCTI
- Ohio State University
- Pennsylvania State University
- Shanghai Astronomical Observatory
- United Kingdom Participation Group
- Universidad Nacional Autonoma de Mexico
- University of Arizona
- University of Colorado Boulder
- University of Oxford
- University of Utah
- University of Virginia
- University of Washington
- University of Wisconsin
- Vanderbilt University
- Yale University
- National Aeronautics and Space Administration
- STFC [ST/K00090X/1, ST/N000668/1, ST/M001156/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/K00090X/1, ST/N000668/1] Funding Source: researchfish
- Division Of Astronomical Sciences
- Direct For Mathematical & Physical Scien [1517006] Funding Source: National Science Foundation
- Grants-in-Aid for Scientific Research [15K17603] Funding Source: KAKEN
Using kinematic maps from the Sloan Digital Sky Survey (SDSS) Mapping Nearby Galaxies at Apache Point Observatory (MaNGA) survey, we reveal that the majority of low-mass quenched galaxies exhibit coherent rotation in their stellar kinematics. Our sample includes all 39 quenched low-mass galaxies observed in the first year of MaNGA. The galaxies are selected with M-r > -19.1, stellar masses 10(9) M-circle dot < M-* < 5 x 10(9) M-circle dot, EWH alpha < 2 angstrom, and all have red colours (u - r) > 1.9. They lie on the size-magnitude and sigma-luminosity relations for previously studied dwarf galaxies. Just six (15 +/- 5.7 per cent) are found to have rotation speeds v(e, rot) < 15 km s(-1) at similar to 1 R-e, and may be dominated by pressure support at all radii. Two galaxies in our sample have kinematically distinct cores in their stellar component, likely the result of accretion. Six contain ionized gas despite not hosting ongoing star formation, and this gas is typically kinematically misaligned from their stellar component. This is the first large-scale Integral Field Unit (IFU) study of low-mass galaxies selected without bias against low-density environments. Nevertheless, we find the majority of these galaxies are within similar to 1.5 Mpc of a bright neighbour (M-K < -23; or M-* > 5 x 10(10) M-circle dot), supporting the hypothesis that galaxy-galaxy or galaxy-group interactions quench star formation in low-mass galaxies. The local bright galaxy density for our sample is rho(proj) = 8.2 +/- 2.0 Mpc(-2), compared to rho(proj) = 2.1 +/- 0.4 Mpc(-2) for a star-forming comparison sample, confirming that the quenched low-mass galaxies are preferentially found in higher density environments.
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