Absorption Studies of the Most Diffuse Gas in the Large-Scale Structure

Fang, Taotao; Mathur, S.; Nicastro, F.

doi:10.1007/978-981-16-4544-0_121-1

Handbook of X-Ray and Gamma-Ray Astrophysics 2022

DOI: 10.1007/978-981-16-4544-0_121-1

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Absorption Studies of the Most Diffuse Gas in the Large-Scale Structure

Taotao Fang

S. Mathur

F. Nicastro

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2024

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Cited by 1 publication

References 92 publications

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The SRG/eROSITA all-sky survey

Zhang,

Bulbul,

Malavasi

et al. 2024

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The properties of the warm-hot intergalactic medium (WHIM) in cosmic filaments are among the least quantified units in modern astrophysics. The Spectrum Roentgen Gamma/eROSITA All Sky Survey (SRG/eRASS) provides a unique opportunity to study the X-ray emission of the WHIM. We applied both imaging and spectroscopic stacking techniques to the data of the first four eRASS scans to inspect the X-ray emissions from 7817 cosmic filaments identified from Sloan Digital Sky Survey (SDSS) optical galaxy samples. We obtained a 9σ significant detection of the total X-ray signal from filaments in the 0.3–1.2 keV band. Here, we introduce a novel method to estimate the contamination fraction from unmasked X-ray halos, active galactic nuclei, and X-ray binaries associated with filament galaxies. We found an approximately 40% contamination fraction for these unmasked sources, suggesting that the remaining 60% of the signal could be coming from the WHIM and a 5.4σ detection significance of the WHIM. Moreover, we modeled the temperature and baryon density contrast of the detected WHIM by fitting the stacked spectrum and surface brightness profile. The best-fit temperature log(T/K) = 6.84 ± 0.07, obtained by using a single temperature model, is marginally higher than in the simulation results. This could be due to the fitting of a single temperature model on a multi-temperature spectrum. Assuming a 0.2 solar abundance, the best-fit baryon density contrast logΔb = 1.88 ± 0.18 is in general agreement with the X-ray emitting phases in the IllustrisTNG simulation. This result suggests that the broadband X-ray emission traces the high end of the temperature and density values that characterize the entire WHIM population.

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The SRG/eROSITA all-sky survey

Zhang,

Bulbul,

Malavasi

et al. 2024

A&A

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Absorption Studies of the Most Diffuse Gas in the Large-Scale Structure

Cited by 1 publication

References 92 publications

The SRG/eROSITA all-sky survey

The SRG/eROSITA all-sky survey

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