Issue |
A&A
Volume 622, February 2019
|
|
---|---|---|
Article Number | A117 | |
Number of page(s) | 28 | |
Section | Extragalactic astronomy | |
DOI | https://doi.org/10.1051/0004-6361/201833944 | |
Published online | 07 February 2019 |
Galaxy populations in the most distant SPT-SZ clusters
I. Environmental quenching in massive clusters at 1.4 ≲ z ≲ 1.7
1
Faculty of Physics, Ludwig-Maximilians-Universität, Scheinerstr. 1, 81679 Munich, Germany
e-mail: vstrazz@usm.lmu.de
2
Max Planck Institute for Extraterrestrial Physics, Giessenbachstr. 1, 85748 Garching, Germany
3
Excellence Cluster Universe, Boltzmannstr. 2, 85748 Garching, Germany
4
INAF-Osservatorio Astronomico di Trieste, Via G. B. Tiepolo 11, 34143 Trieste, Italy
5
Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA
6
Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, USA
7
Kavli Institute for Cosmological Physics, University of Chicago, 5640 South Ellis Avenue, Chicago, IL 60637, USA
8
Department of Astronomy and Astrophysics, University of Chicago, 5640 South Ellis Avenue, Chicago, IL 60637, USA
9
Kavli Institute for Particle Astrophysics and Cosmology, Stanford University, 452 Lomita Mall, Stanford, CA 94305, USA
10
Department of Physics, Stanford University, 382 Via Pueblo Mall, Stanford, CA 94305, USA
11
Physics Department, University of California, Davis, CA 95616, USA
12
Fermi National Accelerator Laboratory, Batavia, IL 60510-0500, USA
13
Argonne National Laboratory, High-Energy Physics Division, 9700 S. Cass Avenue, Argonne, IL 60439, USA
14
Department of Physics and Astronomy, University of Missouri, 5110 Rockhill Road, Kansas City, MO 64110, USA
15
Academia Sinica Institute of Astronomy and Astrophysics, 11F of AS/NTU Astronomy-Mathematics Building, No.1, Sec. 4, Roosevelt Rd, Taipei 10617, Taiwan
16
Department of Astronomy, University of Florida, Gainesville, FL 32611, USA
17
School of Physics, University of Melbourne, Parkville, VIC 3010, Australia
18
Department of Physics, University of Montreal, Montreal, QC H3C 3J7, Canada
19
Center for Astrophysics and Space Astronomy, Department of Astrophysical and Planetary Science, University of Colorado, Boulder, CO 80309, USA
20
NASA Ames Research Center, Moffett Field, CA 94035, USA
21
Argelander-Institut für Astronomie, Auf dem Hügel 71, 53121 Bonn, Germany
22
Department of Physics, University of Michigan, 450 Church Street, Ann Arbor, MI 48109, USA
23
LSST, 950 North Cherry Avenue, Tucson, AZ 85719, USA
Received:
24
July
2018
Accepted:
18
December
2018
We present the first results from a galaxy population study in the highest redshift galaxy clusters identified in the 2500 deg2 South Pole Telescope Sunyaev Zel’dovich effect (SPT-SZ) survey, which is sensitive to M500 ≳ 3 × 1014 M⊙ clusters from z ∼ 0.2 out to the highest redshifts where such massive structures exist. The cluster selection is to first order independent of galaxy properties, making the SPT-SZ sample particularly well suited for cluster galaxy population studies. We carried out a four-band imaging campaign with the Hubble and Spitzer Space Telescopes of the five z ≳ 1.4, S/NSZE > 5 clusters, that are among the rarest most massive clusters known at this redshift. All five clusters show clear overdensities of red galaxies whose colors agree with the initial cluster redshift estimates, although one (SPT-CLJ0607–4448) shows a galaxy concentration much less prominent than the others. The highest redshift cluster in this sample, SPT-CLJ0459–4947 at z ∼ 1.72, is the most distant M500 > 1014 M⊙ cluster discovered thus far through its intracluster medium, and is one of only three known clusters in this mass range at z ≳ 1.7, regardless of selection. Based on UVJ-like photometric classification of quiescent and star-forming galaxies, we find that the quiescent fraction in the cluster central regions (r/r500 < 0.7) is higher than in the field at the same redshift, with corresponding environmental quenching efficiencies typically in the range ∼0.5 − 0.8 for stellar masses log(M/M⊙) > 10.85. We have explored the impact of emission from star formation on the selection of this sample, concluding that all five clusters studied here would still have been detected with S/NSZE> 5, even if they had the same quiescent fraction as measured in the field. Our results thus point towards an efficient suppression of star formation in the central regions of the most massive clusters, occurring already earlier than z ∼ 1.5.
Key words: galaxies: general / galaxies: clusters: general / galaxies: evolution / galaxies: high-redshift
© ESO 2019
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