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Observations of compact sources in galaxy clusters using MUSTANG2

Journal Article · · Monthly Notices of the Royal Astronomical Society
 [1];  [2];  [3];  [3];  [4];  [4];  [5];  [6];  [4];  [7];  [8];  [9];  [10];  [4];  [11];  [12];  [13];  [3];  [14];  [2] more »;  [15];  [16];  [17];  [18];  [19];  [4];  [4];  [4];  [20] « less
  1. University of Pennsylvania, PA (United States); Stony Brook University
  2. Sapienza University of Rome (Italy)
  3. University of Pennsylvania, PA (United States)
  4. National Institute of Standards and Technology (NIST), Boulder, CO (United States)
  5. University of KwaZulu-Natal, Durban (South Africa)
  6. University of Toronto, Ontario (Canada)
  7. Florida State University, Tallahassee, FL (United States)
  8. Rutgers, the State University of New Jersey, Piscataway, NJ (United States)
  9. University of Trieste (Italy); INAF – Osservatorio Astronomico di Trieste (Italy)
  10. National Radio Astronomy Observatory, Charlottesville, VA (United States)
  11. University of Chicago, IL (United States)
  12. European Southern Observatory, Garching (Germany)
  13. Flatiron Institute, New York, NY (United States)
  14. Haverford College, PA (United States)
  15. University of Pennsylvania, PA (United States); Green Bank Observatory, PA (United States)
  16. University of Virginia, Charlottesville, VA (United States)
  17. Stony Brook University, NY (United States)
  18. McGill University, Montreal, QC (Canada)
  19. Pontificia Universidad Católica de Valparaíso (Chile)
  20. University of Pennsylvania, PA (United States); Massachusetts Institute of Technology (MIT), Cambridge, MA (United States)
+ Show Author Affiliations
Compact sources can cause scatter in the scaling relationships between the amplitude of the thermal Sunyaev–Zel’dovich Effect (tSZE) in galaxy clusters and cluster mass. Estimates of the importance of this scatter vary – largely due to limited data on sources in clusters at the frequencies at which tSZE cluster surveys operate. In this paper, we present 90 GHz compact source measurements from a sample of 30 clusters observed using the MUSTANG2 instrument on the Green Bank Telescope. We present simulations of how a source’s flux density, spectral index, and angular separation from the cluster’s centre affect the measured tSZE in clusters detected by the Atacama Cosmology Telescope (ACT). By comparing the MUSTANG2 measurements with these simulations we calibrate an empirical relationship between 1.4 GHz flux densities from radio surveys and source contamination in ACT tSZE measurements. We find 3 per cent of the ACT clusters have more than a 20 per cent decrease in Compton-y but another 3 per cent have a 10 per cent increase in the Compton-y due to the matched filters used to find clusters. As sources affect the measured tSZE signal and hence the likelihood that a cluster will be detected, testing the level of source contamination in the tSZE signal using a tSZE-selected catalogue is inherently biased. We confirm this by comparing the ACT tSZE catalogue with optically and X-ray-selected cluster catalogues. Furthermore, there is a strong case for a large, high-resolution survey of clusters to better characterize their source population.
Research Organization:
Stony Brook University, NY (United States)
Sponsoring Organization:
National Science Foundation (NSF); USDOE Office of Science (SC), High Energy Physics (HEP)
Grant/Contract Number:
SC0020441
OSTI ID:
2205306
Journal Information:
Monthly Notices of the Royal Astronomical Society, Journal Name: Monthly Notices of the Royal Astronomical Society Journal Issue: 2 Vol. 508; ISSN 0035-8711
Publisher:
Oxford University PressCopyright Statement
Country of Publication:
United States
Language:
English

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Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
cosmic background radiation
galaxies: clusters: general