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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
SDSS-IV MaNGA - The spatially resolved transition from star formation to quiescence
Monthly Notices of the Royal Astronomical Society, Volume 466, No. 3, Year 2017
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Description
Using spatially resolved spectroscopy from SDSS-IV MaNGA we have demonstrated that low ionization emission-line regions (LIERs) in local galaxies result from photoionization by hot evolved stars, not active galactic nuclei, hence tracing galactic region hosting old stellar population where, despite the presence of ionized gas, star formation is no longer occurring. LIERs are ubiquitous in both quiescent galaxies and in the central regions of galaxies where star formation takes place at larger radii.We refer to these two classes of galaxies as extended LIER (eLIER) and central LIER (cLIER) galaxies, respectively. cLIERs are late-type galaxies primarily spread across the green valley, in the transition region between the star formation main sequence and quiescent galaxies. These galaxies display regular disc rotation in both stars and gas, although featuring a higher central stellar velocity dispersion than star-forming galaxies of the same mass. cLIERs are consistent with being slowly quenched inside-out; the transformation is associated with massive bulges, pointing towards the importance of bulge growth via secular evolution. eLIERs aremorphologically early types and are indistinguishable from passive galaxies devoid of line emission in terms of their stellar populations, morphology and central stellar velocity dispersion. Ionized gas in eLIERs shows both disturbed and disclike kinematics. When a large-scale flow/rotation is observed in the gas, it is often misaligned relative to the stellar component. These features indicate that eLIERs are passive galaxies harbouring a residual cold gas component, acquired mostly via external accretion. Importantly, quiescent galaxies devoid of line emission reside in denser environments and have significantly higher satellite fraction than eLIERs. Environmental effects thus represent the likely cause for the existence of line-less galaxies on the red sequence. © 2016 The Authors.
Authors & Co-Authors
Belfiore, Francesco M.C.
United Kingdom, Cambridge
University of Cambridge
Maiolino, Roberto
United Kingdom, Cambridge
University of Cambridge
Maraston, Claudia
United Kingdom, Portsmouth
University of Portsmouth
Emsellem, Éric
Germany, Garching Bei Munchen
European Southern Observatory
France, Saint-genis-laval
Centre de Recherche Astrophysique de Lyon
Bershady, Matthew A.
United States, Madison
University of Wisconsin-madison
Masters, Karen L.
United Kingdom, Portsmouth
University of Portsmouth
United Kingdom
South East Physics Network Sepnet
Bizyaev, Dmitry Anatolevich
Russian Federation, Moscow
Lomonosov Moscow State University
United States, Las Cruces
New Mexico State University
Boquien, Médéric
Chile, Antofagasta
Universidad de Antofagasta
Brownstein, Joel R.
United States, Salt Lake City
The University of Utah
Bundy, Kevin A.
Japan, Tokyo
The University of Tokyo
Diamond-Stanic, Aleksandar M.
United States, Madison
University of Wisconsin-madison
United States, Lewiston
Bates College
Drory, Niv
United States, Austin
The University of Texas at Austin
Heckman, Timothy M.
United States, Baltimore
Johns Hopkins University
Law, David R.
United States, Baltimore
Space Telescope Science Institute
Oravetz, Audrey E.
United States, Las Cruces
New Mexico State University
Pan, Kaike
United States, Las Cruces
New Mexico State University
Roman-Lopes, Alexandre
Chile, La Serena
Universidad de la Serena
Thomas, Daniel B.
United Kingdom, Portsmouth
University of Portsmouth
Weijmans, Anne Marie
United Kingdom, St Andrews
University of st Andrews
Yan, Renbin
United States, Lexington
University of Kentucky
Statistics
Citations: 80
Authors: 20
Affiliations: 18
Identifiers
Doi:
10.1093/mnras/stw3211
ISSN:
00358711
Research Areas
Environmental
Study Design
Cross Sectional Study