Shocks and cold fronts in galaxy clusters
نویسندگان
چکیده
منابع مشابه
Shocks and Cold Fronts in Galaxy Clusters
The currently operating X-ray imaging observatories provide us with an exquisitely detailed view of the Megaparsec-scale plasma atmospheres in nearby galaxy clusters. At z < 0.05, the Chandra’s 1 angular resolution corresponds to linear resolution of less than a kiloparsec, which is smaller than some interesting linear scales in the intracluster plasma. This enables us to study the previously u...
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Recently, high-resolution Chandra observations revealed the existence of very sharp features in the Xray surface brightness and temperature maps of several clusters (Vikhlinin et al., 2001). These features, called “cold fronts”, are characterized by an increase in surface brightness by a factor ∼> 2 over 10-50 kpc, accompanied by a drop in temperature of a similar magnitude. The existence of su...
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We construct an analytical model of the mass distribution function of subhalos in a galaxy cluster in the context of the cold dark matter (CDM) theory. Our model takes account of two important effects; the high density of the precluster region and the spatial correlation of initial density fluctuations. For subhalos with small masses, the mass distribution function that our model predicts is in...
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Chandra X-ray observations revealed the presence of cold fronts – sharp contact discontinuities between gas regions with different temperatures and densities – in the centers of many, if not most, relaxed clusters with cool cores. We use high-resolution simulations of idealized cluster mergers to address the origin of such fronts. Typical observed gas density and temperature profiles are used a...
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A generic expectation for gas accreted by high-mass haloes is that it is shock-heated to the virial temperature of the halo. In low-mass haloes, or at high redshift, however, the gas cooling rate is sufficiently rapid that an accretion shock is unlikely to form close to the virial radius. Instead, the accretion shock will form at smaller radii, perhaps close to the central galaxy. Semi-analytic...
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ژورنال
عنوان ژورنال: Physics Reports
سال: 2007
ISSN: 0370-1573
DOI: 10.1016/j.physrep.2007.01.001