منابع مشابه
Environmental Dependence of the Nature of Gaseous Envelopes of Galaxies
We present new statistical study on the origin of Lyα absorption systems that are detected in QSO fields. The primary objective is to investigate environmental dependence of the relationship between galaxies and Lyα absorption systems. We find that galaxies exhibit no environmental dependence in giving rise to Lyα absorbers in their halos. Conversely, Lyα absorbers do not exhibit preference as ...
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We present cross sections and reaction rates for merging to occur during encounters of equal-mass spherical galaxies. As an application, we determine the rate of galaxy merging in clusters of galaxies. We present results for two types of Plummer models (a full and a truncated one), two King models and the Hernquist model. Cross sections are determined on the basis of a large number (∼ 500) of s...
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This paper classifies green envelopes as green roofs and green walls according to effective factors, which were derived from literature to compare the green envelopes’ thermal and energy performance in a more effective way. For this purpose, an extensive literature review was carried out by searching keywords in databases and studying related journal papers and articles. The research meth...
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We consider the sample of weakly active galaxies situated in ’Local Universe’ collected in the paper of Pellegrini (2005) with inferred accretion efficiencies from 10−2 to 10−7. We apply a model of spherically symmetrical Bondi accretion for given parameters (MBH ,T∞,ρ∞,) taken from observation. We calculate spectra emitted by the gas accreting onto its central objects using Monte Carlo method ...
متن کاملStellar Populations in the Central Galaxies of Fossil Groups
It is inferred from the symmetrical and luminous X-ray emission of fossil groups that they are mature, relaxed galaxy systems. Cosmological simulations and observations focusing on their dark halo and inter-galactic medium properties confirm their early formation. Recent photometric observations suggest that, unlike the majority of non-fossil brightest group galaxies (BGGs), the central early-t...
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ژورنال
عنوان ژورنال: Symposium - International Astronomical Union
سال: 1987
ISSN: 0074-1809
DOI: 10.1017/s0074180900185997