The SRG/eROSITA all-sky survey: X-ray emission from the warm-hot phase gas in long cosmic filaments

被引：0

作者：

Zhang, X. ^{[1
]}

Bulbul, E. ^{[1
]}

Malavasi, N. ^{[1
]}

Ghirardini, V. ^{[1
,2
]}

Comparat, J. ^{[1
]}

Kluge, M. ^{[1
]}

Liu, A. ^{[1
]}

Merloni, A. ^{[1
]}

Zhang, Y. ^{[1
]}

Bahar, Y.E. ^{[1
]}

Artis, E. ^{[1
]}

Sanders, J.S. ^{[1
]}

Garrel, C. ^{[1
]}

Balzer, F. ^{[1
]}

Brüggen, M. ^{[3
]}

Freyberg, M. ^{[1
]}

Gatuzz, E. ^{[1
]}

Grandis, S. ^{[5
]}

Krippendorf, S. ^{[4
,6
]}

Nandra, K. ^{[1
]}

Ponti, G. ^{[1
,7
]}

Ramos-Ceja, M. ^{[1
]}

Predehl, P. ^{[1
]}

Reiprich, T.H. ^{[8
]}

Veronica, A. ^{[8
]}

Yeung, M.C.H. ^{[1
]}

Zelmer, S. ^{[1
]}

机构：

[1] Max-Planck-Institut fur Extraterrestrische Physik, Giessenbachstrasse, Garching,85748, Germany

[2] INAF, Osservatorio di Astrofisica e Scienza dello Spazio, Via Piero Gobetti 93/3, Bologna,40129, Italy

[3] Hamburger Sternwarte, Gojenbergsweg 112, Hamburg,21029, Germany

[4] University Observatory Munich, Faculty of Physics, Ludwig-Maximilians-Universität, Scheinerstr. 1, Munich,81679, Germany

[5] Universität Innsbruck, Institut für Astro- und Teilchenphysik, Technikerstrasse 25/8, Innsbruck,6020, Austria

[6] Arnold Sommerfeld Center for Theoretical Physics, LMU Munich, Theresienstr. 37, Munich,80333, Germany

[7] INAF, Osservatorio Astronomico di Brera, Via E. Bianchi 46, LC, Merate,23807, Italy

[8] Argelander Institute for Astronomy, University of Bonn, Auf dem Hügel 71, Bonn,53121, Germany

来源：

Astronomy and Astrophysics | 2024年 / 691卷

关键词：

Cosmology;

D O I：

10.1051/0004-6361/202450933

中图分类号：

学科分类号：

摘要：

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 9σsignificant 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 5.4σdetection 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. ©The Authors 2024.

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