Euclid preparation. LXVI. Impact of line-of-sight projections on the covariance between galaxy cluster multi-wavelength observable properties: insights from hydrodynamic simulations
Abstrak
Cluster cosmology can benefit from combining multi-wavelength studies. In turn, these studies benefit from a characterisation of the correlation coefficients among different mass-observable relations. In this work, we aim to provide information on the scatter, skewness, and covariance of various mass-observable relations in galaxy clusters in cosmological hydrodynamic simulations. This information will help future analyses improve the general approach to accretion histories and projection effects, as well as to model mass-observable relations for cosmology studies. We identified galaxy clusters in Magneticum Box2b simulations with masses of M_ 200c M _⊙ at redshifts of z=0.24 and z=0.90. Our analysis included properties such as richness, stellar mass, lensing mass, and concentration. Additionally, we investigated complementary multi-wavelength data, including X-ray luminosity, integrated Compton-y parameter, gas mass, and temperature. We then examined the impact of projection effects on mass-observable residuals and correlations. We find that at intermediate redshift (z=0.24), projection effects have the greatest impact of lensing concentration, richness, and gas mass in terms of the scatter and skewness of the log-residuals of scaling relations. The contribution of projection effects can be significant enough to boost a spurious hot- versus cold-baryon correlations and consequently hide underlying correlations due to halo accretion histories. At high redshift (z=0.9), the richness has a much lower scatter (of log-residuals), while the quantity that is most impacted by projection effects is the lensing mass. The lensing concentration reconstruction, in particular, is affected by deviations of the reduced-shear profile shape from that derived using a Navarro-Frenk-White (NFW) profile; the amount of interlopers in the line of sight, on the other hand, is not as important.
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Euclid Collaboration A. Ragagnin
A. Saro
S. Andreon
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K. Dolag
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U. Trieste
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Infn
Sezione di Trieste
Inaf Brera
Universitatssternwarte Munchen
F. Physik
Ludwig-Maximilians-Universitat Munchen
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INFN-Bologna
Istituto Nazionale Fisica Nucleare
Sezione Infn di Bologna
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Universit'e Psl
Universit'e de Paris Cit'e
Cnrs
France
I. Paris
Umr 7095
Sorbonne Universit'e
S. O. Physics
H. P. Laboratory
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I. Bologna
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N. University
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Institute of Cosmology
Gravitation
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Urb. Villafranca del Castillo
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Centre for Astrophysics Supercomputing
S. U. O. Technology
Queen Mary University London
U. Cape
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Ictp Joint Institute for Nuclear Research
Instituto de F'isica Te'orica
Universidade Estadual Paulista
Brazil
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Sweden
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