Lyman alpha systems within hot galactic halos

Abstract

A hot gas halo is predicted by chemodynamical models during the early evolution of spheroidal galaxies. Cold condensations, arising from thermal instabilities in the hot gas, are expected to be embedded in the hot halo. In the early phases of the galaxy (t < 1 Gyr), a strong X-ray and EUV emission is produced by the extended hot gas distribution, ionizing the cold clouds. This self-irradiating two-phase halo model successfully explains several line ratios observed in QSO absorption-line systems, and reproduces the temperature distribution of Lyman-$\alpha$ clouds.

5 pages, 4 figures, accepted for publication in MNRAS

Cited by in corpus (7)

• Quantifying the evolution of higher-order clustering
• Clues to the nature of damped Lyman alpha systems from chemical evolution models
• Metal abundances and kinematics of quasar absorbers - II. Absorption systems toward Q0347-3819 and APM BR J0307-4945
• Metal abundances and kinematics of quasar absorbers.- I. Absorption systems toward J2233-606
• The cosmological evolution of colour gradients in spheroids
• On the Gas Surrounding High Redshift Galaxy Clusters
• Be, V and Cu in the halo star CS 31082-001 from near-UV spectroscopy