Star-forming brightest cluster galaxies at 0.25 < z < 1.25: A transitioning fuel supply
Journal Article
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· The Astrophysical Journal (Online)
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- Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
- Univ. of Hawaii, Honolulu, HI (United States)
- Harvard-Smithsonian Center for Astrophysics, Cambridge, MA (United States); Harvard Univ., Cambridge, MA (United States)
- Stanford Univ., Stanford, CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Argelander-Institut fur Astronomie, Bonn (Germany)
- Harvard-Smithsonian Center for Astrophysics, Cambridge, MA (United States)
- Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States); Univ. of Chicago, Chicago, IL (United States)
- Univ. of Chicago, Chicago, IL (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
- Univ. of Missouri, Kansas City, MO (United States)
- Ludwig Maximilian Univ., Munchen (Germany)
- Ludwig Maximilian Univ., Munchen (Germany); Excellence Cluster Universe, Garching (Germany)
- Univ. of Florida, Gainesville, FL (United States)
- Univ. of Montreal, Quebec (Canada)
- Univ. of California, Berkeley, CA (United States)
- Univ. of Arizona, Tucson, AZ (United States)
- Univ. of Melbourne, Parkville (Australia)
- Case Western Reserve Univ., Cleveland, OH (United States)
- Univ. of California, Davis, CA (United States)
- Univ. of Illinois, Urbana, IL (United States)
- Cerro Tololo Inter-American Observator, La Serena (Chile)
In this paper, we present a multiwavelength study of the 90 brightest cluster galaxies (BCGs) in a sample of galaxy clusters selected via the Sunyaev Zel'dovich effect by the South Pole Telescope, utilizing data from various ground- and space-based facilities. We infer the star-formation rate (SFR) for the BCG in each cluster—based on the UV and IR continuum luminosity, as well as the [O ii]λλ3726,3729 emission line luminosity in cases where spectroscopy is available—and find seven systems with SFR > 100 M⊙ yr-1. We find that the BCG SFR exceeds 10 M⊙ yr-1 in 31 of 90 (34%) cases at 0.25 < z < 1.25, compared to ~1%–5% at z ~ 0 from the literature. At z ≳ 1, this fraction increases to $${92}_{-31}^{+6}$$%, implying a steady decrease in the BCG SFR over the past ~9 Gyr. At low-z, we find that the specific SFR in BCGs is declining more slowly with time than for field or cluster galaxies, which is most likely due to the replenishing fuel from the cooling ICM in relaxed, cool core clusters. At z ≳ 0.6, the correlation between the cluster central entropy and BCG star formation—which is well established at z ~ 0—is not present. Instead, we find that the most star-forming BCGs at high-z are found in the cores of dynamically unrelaxed clusters. We use data from the Hubble Space Telescope to investigate the rest-frame near-UV morphology of a subsample of the most star-forming BCGs, and find complex, highly asymmetric UV morphologies on scales as large as ~50–60 kpc. Finally, the high fraction of star-forming BCGs hosted in unrelaxed, non-cool core clusters at early times suggests that the dominant mode of fueling star formation in BCGs may have recently transitioned from galaxy–galaxy interactions to ICM cooling.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States); Argonne National Laboratory (ANL), Argonne, IL (United States); Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States); SLAC National Accelerator Lab. (SLAC), Menlo Park, CA (United States); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
- Sponsoring Organization:
- Australian Research Council; National Aeronautic and Space Administration (NASA); National Aeronautics and Space Administration (NASA); National Science Foundation (NSF); Natural Sciences and Engineering Research Council of Canada (NSERC); USDOE Office of Science; USDOE Office of Science (SC), High Energy Physics (HEP); USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
- Contributing Organization:
- Argonne National Laboratory (ANL); Fermi National Accelerator Laboratory (FNAL)
- Grant/Contract Number:
- AC02-06CH11357; AC02-76SF00515
- OSTI ID:
- 1254644
- Alternate ID(s):
- OSTI ID: 1259230
OSTI ID: 1271012
OSTI ID: 22887115
OSTI ID: 2531109
- Report Number(s):
- 1445061; FERMILAB-PUB--16-174-AE-E; 127626
- Journal Information:
- The Astrophysical Journal (Online), Journal Name: The Astrophysical Journal (Online) Journal Issue: 2 Vol. 817; ISSN 1538-4357
- Publisher:
- Institute of Physics (IOP)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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