A hot intergalactic medium?
نویسندگان
چکیده
منابع مشابه
Baryons in the Warm-hot Intergalactic Medium
Approximately 30− 40% of all baryons in the present day universe reside in a warm-hot intergalactic medium (WHIM), with temperatures between 10 < T < 10 K. This is a generic prediction from six hydrodynamic simulations of currently favored structure formation models having a wide variety of numerical methods, input physics, volumes, and spatial resolutions. Most of these warm-hot baryons reside...
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We observed the Seyfert I active galaxy/broad line radio galaxy 3C 120 with the Chandra high energy transmission gratings and present an analysis of the soft X-ray spectrum. We identify the strongest absorption feature (detected at > 99.9% confidence) with O VIII Lyα (FWHM = 1010+295 −265 km s −1), blueshifted by −5500± 140 km s−1 from systemic velocity. The absorption may be due to missing bar...
متن کاملTracing the Warm Hot Intergalactic Medium in the Local Universe
We present a simple method for tracing the spatial distribution and predicting the physical properties of the Warm-Hot Intergalactic Medium (WHIM), from the map of galaxy light in the local universe. Under the assumption that biasing is local and monotonic we map the ∼ 2 hMpc smoothed density field of galaxy light into the mass density field from which we infer the spatial distribution of the W...
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Both the power spectrum of the Cosmic Microwave Background and the Big Bang Nucleosynthesis theory combined with observations of light elements imply that the baryon density is about 4.5% of critical. Most of these baryons are observed at redshifts greater than two, but have remained elusive at lower redshifts. Hydrodynamic simulations predict that the low redshift baryons are predominately in ...
متن کاملThe Temperature Structure of the Warm-hot Intergalactic Medium
We study the temperature structure of the intergalactic medium (IGM) using a large cosmological N -body/SPH simulation. We employ a two-temperature model for the thermal evolution of the ionized gas, in which the relaxation process between electrons and ions is explicitly included. In the diffuse, hot IGM, the relaxation time is comparable to the age of the Universe and hence the electron tempe...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 1986
ISSN: 0035-8711,1365-2966
DOI: 10.1093/mnras/220.2.439