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High–frequency cluster radio galaxies: Luminosity functions and implications for SZE–selected cluster samples

Journal Article · · Monthly Notices of the Royal Astronomical Society
DOI:https://doi.org/10.1093/mnras/stx095· OSTI ID:1363627
 [1];  [2];  [1];  [3];  [4];  [2];  [5];  [6];  [7];  [8];  [2];  [2];  [9];  [10];  [2];  [11]
  1. Ludwig-Maximilians-Univ., Munich (Germany); Excellence Cluster Universe, Garching (Germany); Max Planck Institute for Extraterrestrial Physics, Garching (Germany)
  2. Ludwig-Maximilians-Univ., Munich (Germany); Excellence Cluster Universe, Garching (Germany)
  3. Univ. of Chicago, Chicago, IL (United States); Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
  4. 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)
  5. Univ. of Chicago, Chicago, IL (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
  6. Ludwig-Maximilians-Univ., Munich (Germany); Excellence Cluster Universe, Garching (Germany); Academia Sinica Institute of Astronomy and Astrophysics, Taipei (Taiwan)
  7. Univ. of Chicago, Chicago, IL (United States)
  8. Univ. of California, Berkeley, CA (United States); McGill Univ., Montreal, QC (Canada)
  9. Univ. of California, Berkeley, CA (United States)
  10. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  11. Univ. of Melbourne, Parkville, VIC (Australia)
+ Show Author Affiliations
We study the overdensity of point sources in the direction of X-ray-selected galaxy clusters from the meta-catalogue of X-ray-detected clusters of galaxies (MCXC; < z > = 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 deg2 SPT-SZ survey maps at the locations of SUMSS sources, producing a multifrequency catalogue 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 catalogues. 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 ± 0.7 per cent of the clusters with detection significance ξ ≥ 4.5 would be lost from the sample. As a result, allowing for redshift evolution of the form (1 + z)2.5 increases the incompleteness to 5.6 ± 1.0 per cent. 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); Argonne National Laboratory (ANL), Argonne, IL (United States); Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
Sponsoring Organization:
German Research Foundation (DFG); Gordon and Betty Moore Foundation; National Science Foundation (NSF); USDOE Office of Science; USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Contributing Organization:
SPT Collaboration
Grant/Contract Number:
AC02-06CH11357; AC02-07CH11359
OSTI ID:
1363627
Alternate ID(s):
OSTI ID: 1366529
Report Number(s):
FERMILAB-PUB--16-209-AE-PPD; 127894
Journal Information:
Monthly Notices of the Royal Astronomical Society, Journal Name: Monthly Notices of the Royal Astronomical Society Journal Issue: 3 Vol. 467; ISSN 0035-8711
Publisher:
Royal Astronomical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

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Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
cosmology: observations
galaxies: active
galaxies: clusters: general
galaxies: luminosity function
mass function
submillimetre: galaxies