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Quenching or Bursting: Star Formation Acceleration—A New Methodology for Tracing Galaxy Evolution

Martin, D. Christopher and Gonçalves, Thiago S. and Darvish, Behnam and Seibert, Mark and Schiminovich, David (2017) Quenching or Bursting: Star Formation Acceleration—A New Methodology for Tracing Galaxy Evolution. Astrophysical Journal, 842 (1). Art. No. 20. ISSN 1538-4357. http://resolver.caltech.edu/CaltechAUTHORS:20170609-093105834

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Abstract

We introduce a new methodology for the direct extraction of galaxy physical parameters from multiwavelength photometry and spectroscopy. We use semianalytic models that describe galaxy evolution in the context of large-scale cosmological simulation to provide a catalog of galaxies, star formation histories, and physical parameters. We then apply models of stellar population synthesis and a simple extinction model to calculate the observable broadband fluxes and spectral indices for these galaxies. We use a linear regression analysis to relate physical parameters to observed colors and spectral indices. The result is a set of coefficients that can be used to translate observed colors and indices into stellar mass, star formation rate, and many other parameters, including the instantaneous time derivative of the star formation rate, which we denote the Star Formation Acceleration (SFA), We apply the method to a test sample of galaxies with GALEX photometry and SDSS spectroscopy, deriving relationships between stellar mass, specific star formation rate, and SFA. We find evidence for a mass-dependent SFA in the green valley, with low-mass galaxies showing greater quenching and higher-mass galaxies greater bursting. We also find evidence for an increase in average quenching in galaxies hosting an active galactic nucleus. A simple scenario in which lower-mass galaxies accrete and become satellite galaxies, having their star-forming gas tidally and/or ram-pressure stripped, while higher-mass galaxies receive this gas and react with new star formation, can qualitatively explain our results.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.3847/1538-4357/aa71a9DOIArticle
http://iopscience.iop.org/article/10.3847/1538-4357/aa71a9PublisherArticle
https://arxiv.org/abs/1705.03514arXivDiscussion Paper
Additional Information:© 2017 American Astronomical Society. Received 2016 October 8. Accepted 2017 May 5. Published 2017 June 8. GALEX (Galaxy Evolution Explorer) is a NASA Small Explorer, launched in April 2003. We gratefully acknowledge NASA's support for construction, operation, and science analysis for the GALEX mission, developed in cooperation with the Centre National d'Etudes Spatiales of France and the Korean Ministry of Science and Technology. Behnam Darvish acknowledges financial support from NASA through the Astrophysics Data Analysis Program (ADAP), grant number NNX12AE20G. We thank the anonymous referee for valuable comments that strengthened the paper. Facilities: GALEX, SDSS.
Group:Space Astrophysics Laboratory
Funders:
Funding AgencyGrant Number
Centre National d'Études Spatiales (CNES)UNSPECIFIED
Ministry of Science and Technology (Korea)UNSPECIFIED
NASANNX12AE20G
Subject Keywords:galaxies: evolution; galaxies: star formation; ultraviolet: galaxies
Record Number:CaltechAUTHORS:20170609-093105834
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20170609-093105834
Official Citation:D. Christopher Martin et al 2017 ApJ 842 20
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:78052
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:09 Jun 2017 17:32
Last Modified:09 Jun 2017 17:32

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