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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Observations of environmental quenching in groups in the 11 GYR since z = 2.5: Different quenching for central and satellite galaxies
Astrophysical Journal, Volume 789, No. 2, Article 164, Year 2014
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Description
We present direct observational evidence for star formation quenching in galaxy groups in the redshift range 0 < z < 2.5. We utilize a large sample of nearly 6000 groups, selected by fixed cumulative number density from three photometric catalogs, to follow the evolving quiescent fractions of central and satellite galaxies over roughly 11 Gyr. At z 0, central galaxies in our sample range in stellar mass from Milky Way/M31 analogs (M /M = 6.5 × 1010) to nearby massive ellipticals (M /M = 1.5 × 1011). Satellite galaxies in the same groups reach masses as low as twice that of the Large Magellanic Cloud (M /M = 6.5 × 10 9). Using statistical background subtraction, we measure the average rest-frame colors of galaxies in our groups and calculate the evolving quiescent fractions of centrals and satellites over seven redshift bins. Our analysis shows clear evidence for star formation quenching in group halos, with a different quenching onset for centrals and their satellite galaxies. Using halo mass estimates for our central galaxies, we find that star formation shuts off in centrals when typical halo masses reach between 1012 and 10 13 M, consistent with predictions from the halo quenching model. In contrast, satellite galaxies in the same groups most likely undergo quenching by environmental processes, whose onset is delayed with respect to their central galaxy. Although star formation is suppressed in all galaxies over time, the processes that govern quenching are different for centrals and satellites. While mass plays an important role in determining the star formation activity of central galaxies, quenching in satellite galaxies is dominated by the environment in which they reside. © 2014. The American Astronomical Society. All rights reserved..
Authors & Co-Authors
Tal, Tomer
United States, Mount Hamilton
Lick Observatory
Dekel, Avishai
Israel, Jerusalem
Hebrew University of Jerusalem
Oesch, P. A.
United States, New Haven
Yale University
Muzzin, Adam V.
Netherlands, Leiden
Sterrewacht Leiden
Brammer, Gabriel B.
United States, Baltimore
Space Telescope Science Institute
Van Dokkum, Pieter G.
United States, New Haven
Yale University
Franx, Marijn
Netherlands, Leiden
Sterrewacht Leiden
Illingworth, Garth D.
United States, Mount Hamilton
Lick Observatory
Leja, Joel
United States, New Haven
Yale University
Magee, Daniel K.
United States, Mount Hamilton
Lick Observatory
Marchesini, Danilo M.
United States, Medford
Tufts University
Momcheva, Ivelina G.
United States, New Haven
Yale University
Nelson, Erica June
United States, New Haven
Yale University
Patel, Shannon G.
United States, Pasadena
Carnegie Observatories
Quadri, Ryan F.
United States, Pasadena
Carnegie Observatories
Rix, Hans Walter R.
Germany, Heidelberg
Max Planck Institute for Astronomy
Skelton, Rosalind E.
South Africa, Cape Town
South African Astronomical Observatory
Wake, David A.
United States, Madison
University of Wisconsin-madison
United Kingdom, Milton Keynes
The Open University
Whitaker, Katherine E.
United States, Greenbelt
Nasa Goddard Space Flight Center
Statistics
Citations: 62
Authors: 19
Affiliations: 12
Identifiers
Doi:
10.1088/0004-637X/789/2/164
ISSN:
0004637X
e-ISSN:
15384357