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Article overview
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Soft X-ray Transmission Spectroscopy of Warm/Hot Intergalactic Medium: Mock Observation of Gamma-Ray Burst X-ray Afterglow | Hajime Kawahara
; Kohji Yoshikawa
; Shin Sasaki
; Yasushi Suto
; Nobuyuki Kawai
; Kazuhisa Mitsuda
; Takaya Ohashi
; Noriko Yamasaki
; | Date: |
27 Apr 2005 | Subject: | astro-ph | Abstract: | We discuss the detectability of Warm/Hot Intergalactic medium (WHIM) via the absorption lines toward bright gamma-ray burst (GRB) afterglows with future X-ray satellite missions like XEUS. We create mock absorption spectra for bright GRB afterglows ($sim 40$ per year over the entire sky) using a light-cone output of a cosmological hydrodynamic simulation. We assume that WHIM is under collisional and photo-ionization equilibrium. If we adopt the constant metallicity of $Z=0.1Z_odot$, approximately one O{sc vii} absorption line system with $>3sigma$ will be detected on average along a random line-of-sight up to $z=0.3$ if XEUS starts observing within a couple of hours after the GRB alert. However the above number is very sensitive to the adopted, and currently unknown, metallicity of the WHIM. We also discuss a feasibility of a follow-up observation for the emission line counterpart with a small dedicated X-ray mission like DIOS (Diffuse Intergalactic Oxygen Surveyor) and reliability of the estimate of the cosmic baryon density. | Source: | arXiv, astro-ph/0504594 | Services: | Forum | Review | PDF | Favorites |
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