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Published February 1, 2018 | Submitted + Published
Journal Article Open

Quenching or Bursting: The Role of Stellar Mass, Environment, and Specific Star Formation Rate to z ~ 1


sing a novel approach, we study the quenching and bursting of galaxies as a function of stellar mass (M *), local environment (Σ), and specific star formation rate (sSFR) using a large spectroscopic sample of ~123,000 GALEX/SDSS and ~420 GALEX/COSMOS/LEGA-C galaxies to z ~ 1. We show that out to z ~ 1 and at fixed sSFR and local density, on average, less massive galaxies are quenching, whereas more massive systems are bursting, with a quenching/bursting transition at log(M_*/M_⊙) ~ 10.5-11 and likely a short quenching/bursting timescale (≾300 Myr). We find that much of the bursting of star formation happens in massive (log(M_*/M_⊙) ≳ 11), high-sSFR galaxies (log(sSFR/Gyr^(−1)) ≳ −2), particularly those in the field (log(Σ/Mpc−2) ≾0 and, among group galaxies, satellites more than centrals). Most of the quenching of star formation happens in low-mass (log(M_*/M_⊙) ≾ 9), low-sSFR galaxies (log(sSFR/Gyr−1) ≾ −2), in particular those located in dense environments (log(Σ/Mpc^(−2)) ≳1), indicating the combined effects of M * and Σ in the quenching/bursting of galaxies since z ~ 1. However, we find that stellar mass has stronger effects than environment on the recent quenching/bursting of galaxies to z ~ 1. At any given M_*, sSFR, and environment, centrals are quenchier (quenching faster) than satellites in an average sense. We also find evidence for the strength of mass and environmental quenching being stronger at higher redshift. Our preliminary results have potential implications for the physics of quenching/bursting in galaxies across cosmic time.

Additional Information

© 2018 American Astronomical Society. Received 2017 November 21. Accepted 2018 January 3. Published 2018 February 1. We are immensely grateful to the anonymous referee for reading the manuscript and providing very useful comments that improved the quality of this paper. We would like to gratefully thank the LEGA-C team for providing the catalog of spectral indices that was used to compare with the extracted indices for sanity checks. B.D. acknowledges financial support from NASA through the Astrophysics Data Analysis Program (ADAP), grant number NNX12AE20G, and the National Science Foundation, grant number 1716907. B.D. is grateful to Alessandro Rettura for the thoughtful discussions and Mark Seibert for providing further information regarding the available GALEX data. D.S. acknowledges financial support from the Netherlands Organisation for Scientific Research (NWO) through a Veni fellowship and from Lancaster University through an Early Career Internal Grant A100679. Based on data products from observations made with ESO telescopes at the La Silla Paranal Observatory under program ID 194.A-2005(A-F). The Galaxy Evolution Explorer (GALEX) is a NASA Small Explorer launched in 2003 April. 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. Funding for SDSS-III has been provided by the Alfred P. Sloan Foundation, the Participating Institutions, the National Science Foundation, and the U.S. Department of Energy Office of Science. The SDSS-III website is http://www.sdss3.org/. SDSS-III is managed by the Astrophysical Research Consortium for the Participating Institutions of the SDSS-III Collaboration, including the University of Arizona, the Brazilian Participation Group, Brookhaven National Laboratory, Carnegie Mellon University, the University of Florida, the French Participation Group, the German Participation Group, Harvard University, the Instituto de Astrofisica de Canarias, the Michigan State/Notre Dame/JINA Participation Group, Johns Hopkins University, Lawrence Berkeley National Laboratory, Max Planck Institute for Astrophysics, Max Planck Institute for Extraterrestrial Physics, New Mexico State University, New York University, Ohio State University, Pennsylvania State University, the University of Portsmouth, Princeton University, the Spanish Participation Group, the University of Tokyo, the University of Utah, Vanderbilt University, the University of Virginia, the University of Washington, and Yale University.

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Submitted - 1801.02618.pdf

Published - Darvish_2018_ApJ_853_155.pdf


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August 21, 2023
August 21, 2023