منابع مشابه
Intergalactic Matter And Cocoons of Radio Galaxies
The cocoons surrounding powerful radio sources can be extensive if the jet that feeds the cocoon is light and supersonic. They have been shown to remain overpressured with respect to the ambient medium for most of the life time of the sources. The observed lobes of the radio sources form parts of these extensive cocoons. We show that observations of the lobes of giant radio sources allow one to...
متن کاملIntergalactic medium heating by dark matter
We derive the evolution of the energy deposition in the intergalactic medium (IGM) by dark matter (DM) decays/annihilations for both sterile neutrinos and light dark matter (LDM) particles. At z > 200 sterile neutrinos transfer a fraction fabs ∼ 0.5 of their rest mass energy into the IGM; at lower redshifts this fraction becomes < ∼ 0.3 depending on the particle mass. The LDM particles can deca...
متن کاملMeasuring the Temperature of the Intergalactic Medium
Numerical simulations indicate that the smooth, photoionized intergalactic medium (IGM) responsible for the low column density Lyα forest follows a well defined temperaturedensity relation. We show that such an equation of state results in a cutoff in the distribution of line widths (b-parameters) as a function of column density (N) for the low column density absorption lines. This explains the...
متن کاملTemperature fluctuations in the intergalactic medium ⋆ †
The temperature of the low-density intergalactic medium is set by the balance between adiabatic cooling resulting from the expansion of the universe, and photo-heating by the UV-background. We have analysed the Lyα forest of eleven high-resolution quasar spectra using wavelets, and find strong evidence of a marked jump in the temperature at the mean density, T0, of 60 ± 14 per cent over the red...
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: The Astronomical Journal
سال: 1966
ISSN: 0004-6256
DOI: 10.1086/110010