skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

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

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 scenariomore » 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.« less

Authors:
; ;  [1];  [2];  [3]
  1. California Institute of Technology, MC 405-47, 1200 East California Boulevard, Pasadena, CA 91125 (United States)
  2. Observatorio do Valongo, Universidade Federal do Rio de Janeiro, Ladeira Pedro Antonio, 43, Saude, Rio de Janeiro-RJ 20080-090 (Brazil)
  3. Department of Astronomy, Columbia University, New York, NY 10027 (United States)
Publication Date:
OSTI Identifier:
22663523
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 842; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ACCELERATION; CATALOGS; EXTRACTION; GALAXIES; MASS; PHOTOMETRY; QUENCHING; REGRESSION ANALYSIS; SATELLITES; SIMULATION; SPECTROSCOPY; STARS; ULTRAVIOLET RADIATION

Citation Formats

Martin, D. Christopher, Darvish, Behnam, Seibert, Mark, Gonçalves, Thiago S., and Schiminovich, David. Quenching or Bursting: Star Formation Acceleration—A New Methodology for Tracing Galaxy Evolution. United States: N. p., 2017. Web. doi:10.3847/1538-4357/AA71A9.
Martin, D. Christopher, Darvish, Behnam, Seibert, Mark, Gonçalves, Thiago S., & Schiminovich, David. Quenching or Bursting: Star Formation Acceleration—A New Methodology for Tracing Galaxy Evolution. United States. doi:10.3847/1538-4357/AA71A9.
Martin, D. Christopher, Darvish, Behnam, Seibert, Mark, Gonçalves, Thiago S., and Schiminovich, David. Sat . "Quenching or Bursting: Star Formation Acceleration—A New Methodology for Tracing Galaxy Evolution". United States. doi:10.3847/1538-4357/AA71A9.
@article{osti_22663523,
title = {Quenching or Bursting: Star Formation Acceleration—A New Methodology for Tracing Galaxy Evolution},
author = {Martin, D. Christopher and Darvish, Behnam and Seibert, Mark and Gonçalves, Thiago S. and Schiminovich, David},
abstractNote = {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.},
doi = {10.3847/1538-4357/AA71A9},
journal = {Astrophysical Journal},
number = 1,
volume = 842,
place = {United States},
year = {Sat Jun 10 00:00:00 EDT 2017},
month = {Sat Jun 10 00:00:00 EDT 2017}
}