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Missing-iron problem and Type Ia supernova enrichment of hot gas in galactic spheroids
hot gas galactic spheroids
2014/12/22
Type Ia supernovae (Ia SNe) provide a rich source of iron for hot gas in galactic stellar spheroids. However, the expected supersolar iron abundance of the hot gas is not observed. Instead, X-ray obse...
Intergalactic Gas in Groups of Galaxies: Implications for Dwarf Spheroidal Formation and The Missing Baryons Problem
Implications Spheroidal Formation Missing Baryons
2011/9/28
Radio galaxies with bent jets are predominantly located in groups and clusters of galaxies. We use bent-double radio sources, under the assumption that their jets are bent by ram-pressure, to probe in...
Do Fast Rotating Bars Present a Problem to the Hierarchical Scenario?
Fast Rotating Bars Hierarchical Scenario
2009/6/11
Do Fast Rotating Bars Present a Problem to the Hierarchical Scenario?
The cosmological, astrophysical, and nucleocosmochronological
methods for estimating the age of the universe and the corresponding
uncertainties are comparatively studied in the present paper.We are...
Exact Solutions of Brans-Dicke Cosmology and the Cosmic Coincidence Problem
Brans-Dicke Cosmology the Cosmic Coincidence Problem
2010/10/15
We present some cosmological solutions of Brans-Dicke theory, characterized by a decaying vacuum energy density and by a constant relative matter density. With these features, they shed light on the c...