Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 492, Issue 1, Pages 96-139Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stz3264
Keywords
galaxies: evolution; galaxies: formation; galaxies: star formation; galaxies: statistics; galaxies: structure
Categories
Funding
- European Research Council (ERC) [695671 'QUENCH']
- Science and Technology FacilitiesCouncil (STFC)
- Consejo Nacional de Ciencia y Tecnologia (CONACYT) [CB-285080, FC-2016-01-1916]
- Natural Sciences & Engineering Research Council of Canada (NSERC) Discovery Grant
- Mobilising European Research in Astrophysics & Cosmology (MERAC) Foundation
- Alfred P. Sloan Foundation
- National Science Foundation
- U.S. Department of Energy
- National Aeronautics and Space Administration
- Japanese Monbukagakusho
- Max Planck Society
- Higher Education Funding Council for England
- U.S. Department of Energy Office of Science
- Center for HighPerformance Computing at the University of Utah
- [PAPIIT-DGAPA-IA101217]
- STFC [ST/M001172/1] Funding Source: UKRI
Ask authors/readers for more resources
We present an analysis of star formation and quenching in the SDSS-IV MaNGA-DR15, utilizing over 5 million spaxels from similar to 3500 local galaxies. We estimate star formation rate surface densities (Sigma(SFR)) via dust corrected H alpha flux where possible, and via an empirical relationship between specific star formation rate (sSFR) and the strength of the 4000 angstrom break (D4000) in all other cases. We train a multilayered artificial neural network (ANN) and a random forest (RF) to classify spaxels into 'star-forming' and 'quenched' categories given various individual (and groups of) parameters. We find that global parameters (pertaining to the galaxy as a whole) perform collectively the best at predicting when spaxels will be quenched, and are substantially superior to local/spatially resolved and environmental parameters. Central velocity dispersion is the best single parameter for predicting quenching in central galaxies. We interpret this observational fact as a probable consequence of the total integrated energy from active galactic neucleus (AGN) feedback being traced by the mass of the black hole, which is well known to correlate strongly with central velocity dispersion. Additionally, we train both an ANN and RF to estimate Sigma(SFR) values directly via regression in star-forming regions. Local/spatially resolved parameters are collectively the most predictive at estimating Sigma(SFR) in these analyses, with stellar mass surface density at the spaxel location (Sigma(*)) being by far the best single parameter. Thus, quenching is fundamentally a global process but star formation is governed locally by processes within each spaxel.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available