Observing the Universe at millimetre wavelengths

Session

Thursday P1

Jun 29, 2023, 1:50 PM

LPSC Grenoble

Conveners

Thursday P1

• Marco De Petris (Sapienza, University of Rome)

Thursday P1

• Sebastian Bocquet (LMU Munich)

37. Biases in the estimation of the hydrostatic mass of the Virgo simulated clone

Théo Lebeau (Institut d'Astrophysique Spatiale, Université Paris-Saclay)

6/29/23, 1:50 PM

An accurate mass calibration of galaxy clusters is a crucial step towards precise constraints on the cosmological parameters $\sigma_8$ and $\Omega_m$ from clusters. In the millimeter, via the Sunyaev-Zel'dovich (SZ) effect, and X-rays domains, cluster masses can be estimated assuming hydrostatic equilibrium, but several physical and observational effects can alter this calculation. One of...

58. Reconstruction of Galaxy Cluster Physical Properties: a Non-parametric Bayesian Nodal Approach

Kang Wang (Victoria University of Wellington)

6/29/23, 2:10 PM

I will present a nodal approach to recovering the fundamental properties of galaxy clusters like pressure, density, and temperature. The method involves constructing piecewise functions that describe the quantities of galaxy clusters through a set of control points, which are inferred using a non-parametric Bayesian analysis. I will show an application of this method to the analysis of Planck...

59. Effects of observed projections on turbulence statistics in the intracluster medium

Mark Bishop (Victoria University of Wellington)

6/29/23, 2:30 PM

The total mass of a cluster is one of its most fundamental properties. Measurements of the galaxy cluster mass often relies upon assuming hydrostatic equilibrium. However, this is often invalidated as the intracluster medium (ICM) is continuously disturbed by mergers, feedback processes, and motions of galaxies. These processes generate gas motions that contribute nonthermal pressure;...

82. Probing the evolution of galaxy clusters using Sunyaev-Zel’dovich effect

Mohini Pachchigar

6/29/23, 2:50 PM

Mass is the most fundamental property of galaxy clusters however measuring it is still a challenge. Calibrating mass from intracluster medium observables such as the Sunyaev-Zel’dovich (SZ) effect is subject to uncertainty and biases because of the hydrostatic equilibrium assumption. On the other hand, merging cluster systems have been shown to exhibit radio emission which implies a link...

45. Studying the impact of galaxy cluster morphologies on their detection through SZ effect

Stefano Gallo

6/29/23, 3:10 PM

In any cosmological analysis based on the galaxy cluster number count, a very important ingredient is the selection function of the detection method used to produce the galaxy cluster catalog. Indeed, an incorrect determination of this function can lead to biases in the cosmological parameters estimated from the data. In this work we aim to study the possible impact of complex cluster...

48. Morphology with Zernike polynomials: the first application on Planck-SZ galaxy clusters

Valentina Capalbo (Sapienza, University of Rome)

6/29/23, 3:30 PM

The Zernike polynomials has been recently used to model 2D projection maps of galaxy clusters to recover their morphological features. The study of the morphology of clusters maps is, in fact, a well suited approach used to infer, from real data, the dynamical state of those systems. After the validation of the Zernike polynomials as suitable tools to constrain galaxy clusters morphologies,...

13. Blending impact on galaxy clusters with Rubin/LSST

Manon Ramel (LPSC / IN2P3)

6/29/23, 4:20 PM

Galaxy clusters trace the highest peaks in the density of the Universe. Therefore, their abundance is a powerful probe to constrain cosmological parameters, expansion of the Universe and give information on the growth of structures. However, since the density of galaxies is significantly higher, these latter may appear to overlap on the line of sight and have their respective fluxes blended....

30. Galaxy cluster mass inference using weak lensing shear multipoles

Constantin Payerne (LPSC-IN2P3)

6/29/23, 4:40 PM

Weak gravitational lensing is a powerful tool to probe the matter distribution around massive galaxy clusters. In general, such effect can be measured by estimating the averaged tangential shear of background galaxies in circular annuli around the lens center. In addition to the average tangential shear, valuable information on the underlying dark matter distribution can be extracted by using...

52. The hydrostatic-to-lensing mass bias and its evolution with redshift

Miren Muñoz Echeverría (LPSC)

6/29/23, 5:00 PM

Accurate reconstruction of galaxy cluster masses is key to use this population of objects as cosmological probe. In this work we present a study on the hydrostatic to lensing mass scaling relation for a sample of 53 clusters, with redshifts from z = 0.05 to 1.07, for which masses have been reconstructed homogeneously. Masses for each individual cluster have been measured from reconstructed...

105. CHEX-MATE: constraining the origin of the scatter in galaxy cluster radial X-ray surface brightness profiles

Iacopo Bartalucci (INAF-IASF)

6/29/23, 5:20 PM

We present a detailed study of the surface brightness profiles derived from a representative sample of 118 clusters selected via the Sunyaev-Zel'Dovich effect. These profiles represent an ideal tool to investigate the properties of the hot plasma filling the cluster volume. Studies of these profiles have been hampered by selection biases and faintness of the emission in the outskirts. We...