Publication details

Voyage through the hidden physics of the cosmic web


SIMIONESCU Aurora ETTORI Stefano WERNER Norbert NAGAI Daisuke VAZZA Franco AKAMATSU Hiroki PINTO Ciro DE PLAA Jelle WIJERS Nastasha NELSON Dylan POINTECOUTEAU Etienne PRATT Gabriel W. SPIGA Daniele VACANTI Giuseppe LAU Erwin ROSSETTI Mariachiara GASTALDELLO Fabio BIFFI Veronica BULBUL Esra COLLON Maximilien J. DEN HERDER Jan-Willem ECKERT Dominique FRATERNALI Filippo MINGO Beatriz PARESCHI Giovanni PEZZULLI Gabriele REIPRICH Thomas H. SCHAYE Joop WALKER Stephen A. WERK Jessica

Year of publication 2021
Type Article in Periodical
Magazine / Source Experimental Astronomy
MU Faculty or unit

Faculty of Science

Keywords Large-scale structure; Clusters of galaxies; Circumgalactic medium; Warm-hot intergalactic medium
Description The majority of the ordinary matter in the local Universe has been heated by strong structure formation shocks and resides in a largely unexplored hot, diffuse, X-ray emitting plasma that permeates the halos of galaxies, galaxy groups and clusters, and the cosmic web. We propose a next-generation “Cosmic Web Explorer” that will permit a complete and exhaustive understanding of these unseen baryons. This will be the first mission capable to reach the accretion shocks located several times farther than the virial radii of galaxy clusters, and reveal the out-of-equilibrium parts of the intra-cluster medium which are live witnesses to the physics of cosmic accretion. It will also enable a view of the thermodynamics, kinematics, and chemical composition of the circumgalactic medium in galaxies with masses similar to the Milky Way, at the same level of detail that Athena will unravel for the virialized regions of massive galaxy clusters, delivering a transformative understanding of the evolution of those galaxies in which most of the stars and metals in the Universe were formed. Finally, the proposed X-ray satellite will connect the dots of the large-scale structure by mapping, at high spectral resolution, as much as 100% of the diffuse gas hotter than 106 K that fills the filaments of the cosmic web at low redshifts, down to an over-density of 1, both in emission and in absorption against the ubiquitous cosmic X-ray background, surveying at least 1600 square degrees over 5 years in orbit. This requires a large effective area (~ 10 m2 at 1 keV) over a large field of view (~ 1 deg2), a megapixel cryogenic microcalorimeter array providing integral field spectroscopy with a resolving power E/?E = 2000 at 0.6 keV and a spatial resolution of 5'' in the soft X-ray band, and a low and stable instrumental background ensuring high sensitivity to faint, extended emission.
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