High–frequency cluster radio galaxies: Luminosity functions and implications for SZE–selected cluster samples
- Ludwig-Maximilians-Univ., Munich (Germany); Excellence Cluster Universe, Garching (Germany); Max Planck Institute for Extraterrestrial Physics, Garching (Germany)
- Ludwig-Maximilians-Univ., Munich (Germany); Excellence Cluster Universe, Garching (Germany)
- Univ. of Chicago, Chicago, IL (United States); Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
- Ludwig-Maximilians-Univ., Munich (Germany); Excellence Cluster Universe, Garching (Germany); Univ. of Chicago, Chicago, IL (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
- Univ. of Chicago, Chicago, IL (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
- Ludwig-Maximilians-Univ., Munich (Germany); Excellence Cluster Universe, Garching (Germany); Academia Sinica Institute of Astronomy and Astrophysics, Taipei (Taiwan)
- Univ. of Chicago, Chicago, IL (United States)
- Univ. of California, Berkeley, CA (United States); McGill Univ., Montreal, QC (Canada)
- Univ. of California, Berkeley, CA (United States)
- Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
- Univ. of Melbourne, Parkville, VIC (Australia)
We study the overdensity of point sources in the direction of X-ray-selected galaxy clusters from the Meta-Catalog of X-ray detected Clusters of galaxies (MCXC; $$\langle z \rangle = 0.14$$) at South Pole Telescope (SPT) and Sydney University Molonglo Sky Survey (SUMSS) frequencies. Flux densities at 95, 150 and 220 GHz are extracted from the 2500 deg$^2$ SPT-SZ survey maps at the locations of SUMSS sources, producing a multi-frequency catalog of radio galaxies. In the direction of massive galaxy clusters, the radio galaxy flux densities at 95 and 150 GHz are biased low by the cluster Sunyaev-Zel'dovich Effect (SZE) signal, which is negative at these frequencies. We employ a cluster SZE model to remove the expected flux bias and then study these corrected source catalogs. We find that the high frequency radio galaxies are centrally concentrated within the clusters and that their luminosity functions (LFs) exhibit amplitudes that are characteristically an order of magnitude lower than the cluster LF at 843 MHz. We use the 150 GHz LF to estimate the impact of cluster radio galaxies on an SPT-SZ like survey. The radio galaxy flux typically produces a small bias on the SZE signal and has negligible impact on the observed scatter in the SZE mass-observable relation. If we assume there is no redshift evolution in the radio galaxy LF then $$1.8\pm0.7$$ percent of the clusters would be lost from the sample. Allowing for redshift evolution of the form $$(1+z)^{2.5}$$ increases the incompleteness to $$5.6\pm1.0$$ percent. Improved constraints on the evolution of the cluster radio galaxy LF require a larger cluster sample extending to higher redshift.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States); Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
- Sponsoring Organization:
- Gordon and Betty Moore Foundation; National Science Foundation (NSF); German Research Foundation (DFG); USDOE Office of Science (SC), High Energy Physics (HEP)
- Contributing Organization:
- SPT Collaboration
- Grant/Contract Number:
- AC02-06CH11357; AC02-07CH11359; PLR-1248097; PHY-1125897; GBMF 947
- OSTI ID:
- 1363627
- Alternate ID(s):
- OSTI ID: 1366529
- Report Number(s):
- FERMILAB-PUB-16-209-AE-PPD; 127894; TRN: US1702462
- Journal Information:
- Monthly Notices of the Royal Astronomical Society, Vol. 467, Issue 3; ISSN 0035-8711
- Publisher:
- Royal Astronomical SocietyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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