Speaker
Description
We present a joint approach to studying galaxy clusters that combines X-ray data from the Chandra X-ray Observatory with millimeter data from both the South Pole Telescope (SPT) and the Planck satellite, leveraging the complementary capabilities of these three instruments. In particular, 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. This joint analysis allows us to recover detailed thermodynamic profiles, such as density, pressure, temperature, and hydrostatic mass, over a wider radial range than would be possible with X-ray or SZ data alone. In addition to maximizing the accuracy of radial temperature measurements, our joint analysis allows us to test the consistency between X-ray and millimeter derivations of thermodynamic quantities via the introduction of a normalization parameter ($\eta_T$) between X-ray and millimeter temperature profiles. This parameter enables the extraction of other thermodynamic profiles without relying on spectroscopic temperature measurements at large radii, where such data are often sparse or unreliable, particularly for high-redshift or faint clusters. We apply our method to a sample of 10 clusters covering a wide range of masses, deriving hydrostatic mass and gas fraction profiles. As a byproduct, comparing our results with existing observations and simulations allows us to assess the systematics affecting these measurements, including cross-calibration issues between X-ray instruments.
| Would you be interested in presenting a poster if the conference is oversubcribed? | Yes |
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