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

被引：1

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
]}

Brueggen, 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 Inst Extraterr Phys, Giessenbachstr, D-85748 Garching, Germany

[2] INAF, Osservatorio Astrofis & Sci Spazio, Via Piero Gobetti 93-3, I-40129 Bologna, Italy

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

[4] Univ Observ Munich, Ludwig Maximilians Univ, Fac Phys, Scheinerstr 1, D-81679 Munich, Germany

[5] Univ Innsbruck, Inst Astround Teilchenphys, Technikerstr 25-8, A-6020 Innsbruck, Austria

[6] LMU Munchen, Arnold Sommerfeld Ctr Theoret Phys, Theresienstr 37, D-80333 Munich, Germany

[7] INAF, Osservatorio Astron Brera, Via E Bianchi 46, I-23807 Merate, LC, Italy

[8] Univ Bonn, Argelander Inst Astron, Hugel 71, D-53121 Bonn, Germany

来源：

ASTRONOMY & ASTROPHYSICS | 2024年 / 691卷

基金：

欧洲研究理事会;

关键词：

intergalactic medium; large-scale structure of Universe; X-rays: diffuse background; ACTIVE GALACTIC NUCLEI; INTERGALACTIC MEDIUM; ILLUSTRISTNG SIMULATIONS; GALAXY CLUSTERS; MISSING BARYONS; STELLAR MASS; SCALING RELATIONS; WEB; EVOLUTION; MATTER;

D O I：

10.1051/0004-6361/202450933

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

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 9 sigma 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 5.4 sigma 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 log Delta(b) = 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.

引用

页数：19

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