Statistical properties of SZ and X-ray cluster detections

F. Pace, M. Maturi, M. Bartelmann, Nico Cappelluti, K. Dolag, M. Meneghetti, L. Moscardini

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Aims. We calibrate the number density, completeness, reliability, and the lower mass limit of galaxy-cluster detections through their thermal SZ signal and compare them to X-ray cluster detections.Methods. We simulate maps of the thermal SZ effect and the X-ray emission from light cones constructed in a large, hydrodynamical, cosmological simulation volume, including realistic noise contributions. The maps are convolved with linear, optimised, single- and multi-band filters to identify local peaks and their signal-to-noise ratios. The resulting peak catalogues are then compared to the halo population in the simulation volume to identify true and spurious detections. Results. Multi-band filtering improves the statistics of SZ cluster detections considerably compared to single-band filtering. Observations with the characteristics of ACT detect clusters with masses M ≥ 6-9 × 1013 MȮ/h, quite independent of redshift, reach 50% completeness at ∼ 1014 MȮ/h and 100% completeness at ∼2×. 1014 MȮ/h Samples are contaminated by a few spurious detections, but they are only a small percentage of all detections. This is broadly comparable to X-ray cluster detections with XMM-Newton with 100 ks exposure time in the soft band, except that the mass limit for X-ray detections increases much more steeply with redshift than for SZ detections. A comparison of true and filtered signals in the SZ and X-ray maps confirms that the filters introduce at most a negligible bias.

Original languageEnglish (US)
Pages (from-to)389-400
Number of pages12
JournalAstronomy and Astrophysics
Volume483
Issue number2
DOIs
StatePublished - May 1 2008
Externally publishedYes

Fingerprint

x rays
completeness
filter
detection
filters
XMM-Newton telescope
temperature effect
signal-to-noise ratio
newton
catalogs
simulation
temperature effects
halos
cones
signal to noise ratios
statistics
galaxies

Keywords

  • Cosmology: cosmic microwave background
  • Cosmology: theory
  • Galaxies: clusters: general
  • Methods: N-body simulations
  • X-rays: galaxies: clusters

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

Pace, F., Maturi, M., Bartelmann, M., Cappelluti, N., Dolag, K., Meneghetti, M., & Moscardini, L. (2008). Statistical properties of SZ and X-ray cluster detections. Astronomy and Astrophysics, 483(2), 389-400. https://doi.org/10.1051/0004-6361:200809550

Statistical properties of SZ and X-ray cluster detections. / Pace, F.; Maturi, M.; Bartelmann, M.; Cappelluti, Nico; Dolag, K.; Meneghetti, M.; Moscardini, L.

In: Astronomy and Astrophysics, Vol. 483, No. 2, 01.05.2008, p. 389-400.

Research output: Contribution to journalArticle

Pace, F, Maturi, M, Bartelmann, M, Cappelluti, N, Dolag, K, Meneghetti, M & Moscardini, L 2008, 'Statistical properties of SZ and X-ray cluster detections', Astronomy and Astrophysics, vol. 483, no. 2, pp. 389-400. https://doi.org/10.1051/0004-6361:200809550
Pace, F. ; Maturi, M. ; Bartelmann, M. ; Cappelluti, Nico ; Dolag, K. ; Meneghetti, M. ; Moscardini, L. / Statistical properties of SZ and X-ray cluster detections. In: Astronomy and Astrophysics. 2008 ; Vol. 483, No. 2. pp. 389-400.
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