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First detection of stacked X-ray emission from cosmic web filaments
Ist Teil von
Astronomy and astrophysics (Berlin), 2020-11, Vol.643, p.L2
Ort / Verlag
Heidelberg: EDP Sciences
Erscheinungsjahr
2020
Link zum Volltext
Quelle
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Beschreibungen/Notizen
We report the first statistical detection of X-ray emission from cosmic web filaments in ROSAT data. We selected 15 165 filaments at 0.2 <
z
< 0.6 ranging from 30 Mpc to 100 Mpc in length, identified in the Sloan Digital Sky Survey survey. We stacked the X-ray count-rate maps from ROSAT around the filaments, excluding resolved galaxy groups and clusters above the mass of ∼3 × 10
13
M
⊙
as well as the detected X-ray point sources from the ROSAT,
Chandra
, and
XMM-Newton
observations. The stacked signal results in the detection of the X-ray emission from the cosmic filaments at a significance of 4.2
σ
in the energy band of 0.56−1.21 keV. The signal is interpreted, assuming the Astrophysical Plasma Emission Code model, as an emission from the hot gas in the filament-core regions with an average gas temperature of 0.9
−0.6
+1.0
keV and a gas overdensity of
δ
∼ 30 at the center of the filaments. Furthermore, we show that stacking the SRG/eROSITA data for ∼2000 filaments only would lead to a ≳5
σ
detection of their X-ray signal, even with an average gas temperature as low as ∼0.3 keV.