We present a joint millimetric and X-ray analysis of hot gas properties in the distant galaxy cluster SPT-CLJ0615-5746 (z = 0.972). Combining Chandra observations with the South Pole Telescope (SPT) and Planck data, we performed radial measurements of thermodynamical quantities up to a characteristic radius of 1.2 R500. We exploited the high angular resolution of Chandra and SPT to map the innermost region of the cluster and the high sensitivity to the larger angular scales of Planck to constrain the outskirts and improve the estimation of the cosmic microwave background and the galactic thermal dust emissions. In addition to maximizing the accuracy of radial temperature measurements, our joint analysis allows us to test the consistency between X-ray and millimetric derivations of thermodynamic quantities via the introduction of a normalization parameter (ηT) between X-ray and millimetric temperature profiles. This approach reveals a substantial high value of the normalization parameter, ηT = 1.45+−00.1718, suggesting that the gas halo is aspherical. Assuming hot gas hydrostatic equilibrium within complementary angular sectors that intercept the major and minor elongation of the X-ray image, we infer a halo mass profile that results from an effective compensation of azimuthal variations of gas densities by variations in the ηT parameter. Consistent with earlier integrated X-ray and millimetric measurements, we infer a cluster mass of M500HE = 10.67+−00.6250 1014 M .

Mastromarino, C., Oppizzi, F., De Luca, F., Bourdin, H., Mazzotta, P. (2024). Resolving high-z galaxy cluster properties through joint X-ray and millimeter analysis: Case study of SPT-CLJ0615-5746. ASTRONOMY & ASTROPHYSICS, 688 [10.1051/0004-6361/202449422].

Resolving high-z galaxy cluster properties through joint X-ray and millimeter analysis: Case study of SPT-CLJ0615-5746

Mastromarino, C.
;
Oppizzi, F.
;
De Luca, F.
;
Bourdin, H.
;
Mazzotta, P.
2024-01-01

Abstract

We present a joint millimetric and X-ray analysis of hot gas properties in the distant galaxy cluster SPT-CLJ0615-5746 (z = 0.972). Combining Chandra observations with the South Pole Telescope (SPT) and Planck data, we performed radial measurements of thermodynamical quantities up to a characteristic radius of 1.2 R500. We exploited the high angular resolution of Chandra and SPT to map the innermost region of the cluster and the high sensitivity to the larger angular scales of Planck to constrain the outskirts and improve the estimation of the cosmic microwave background and the galactic thermal dust emissions. In addition to maximizing the accuracy of radial temperature measurements, our joint analysis allows us to test the consistency between X-ray and millimetric derivations of thermodynamic quantities via the introduction of a normalization parameter (ηT) between X-ray and millimetric temperature profiles. This approach reveals a substantial high value of the normalization parameter, ηT = 1.45+−00.1718, suggesting that the gas halo is aspherical. Assuming hot gas hydrostatic equilibrium within complementary angular sectors that intercept the major and minor elongation of the X-ray image, we infer a halo mass profile that results from an effective compensation of azimuthal variations of gas densities by variations in the ηT parameter. Consistent with earlier integrated X-ray and millimetric measurements, we infer a cluster mass of M500HE = 10.67+−00.6250 1014 M .
2024
Pubblicato
Rilevanza internazionale
Articolo
Esperti anonimi
Settore FIS/05
Settore PHYS-05/A - Astrofisica, cosmologia e scienza dello spazio
English
cosmic background radiation
cosmology: observations
galaxies: clusters: general
galaxies: clusters: individual: SPT-CLJ0615–5746
galaxies: clusters: intracluster medium
techniques: image processing
Mastromarino, C., Oppizzi, F., De Luca, F., Bourdin, H., Mazzotta, P. (2024). Resolving high-z galaxy cluster properties through joint X-ray and millimeter analysis: Case study of SPT-CLJ0615-5746. ASTRONOMY & ASTROPHYSICS, 688 [10.1051/0004-6361/202449422].
Mastromarino, C; Oppizzi, F; De Luca, F; Bourdin, H; Mazzotta, P
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/404783
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