منابع مشابه
Associated Hi in Absorbers at High Redshift
WSRT observations have provided a first inventory of the incidence of H i 21 cm line absorption associated with AGN at redshifts up to z=1.0. There is a large range in line depths, from τ = 0.44 to τ ≤ 0.001, and a substantial variety of line profiles, from Gaussians of less than ten km s to more typically a few hundred km s, as well as irregular and multi-peaked absorption, sometimes spanning ...
متن کاملThe nature of N v absorbers at high redshift ⋆
We present a study of N v absorption systems at 1.5 z 2.5 in the spectra of 19 QSOs, based on data obtained with the VLT/UVES instrument. Our analysis includes both the absorbers arising from the intergalactic medium, as well as systems in the vicinity of the background quasar. We construct detailed photoionization models to study the physical conditions and abundances in the absorbers and to c...
متن کاملHighly Accreting Quasars at High Redshift
1 Instituto de Astrofísica de Andalucía, IAA-CSIC, Granada, Spain, 2 INAF, Osservatorio Astronomico di Padova, Padova, Italy, 3 CONACYT Research Fellow, Instituto de Astronomía, Universidad Nacional Autónoma de México, Mexico City, Mexico, 4 Instituto de Astronomía, Universidad Nacional Autónoma de México, Mexico City, Mexico, 5 Dipartimento di Fisica Astronomia “Galileo Galilei”, University of...
متن کاملLyman-alpha forest-CMB cross-correlation and the search for the ionised baryons at high redshift
The intergalactic neutral hydrogen which is responsible for the Lyα forest of quasar absorption lines is a tracer of much larger amounts of ionised hydrogen. The ionised component has yet to be detected directly, but is expected to scatter CMB photons via the Sunyaev-Zel’dovich effect. We use hydrodynamic simulations of a LambdaCDM universe to create mock quasar spectra and CMB sky maps from th...
متن کاملCorrelations between O Vi Absorbers and Galaxies at Low Redshift
We investigate the relationship between galaxies and metal-line absorption systems in a large-scale cosmological simulation with galaxy formation. Our detailed treatment of metal enrichment and non-equilibrium calculation of oxygen species allow us, for the first time, to carry out quantitative calculations of the cross-correlations between galaxies and O VI absorbers. We find the following: (1...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Proceedings of the International Astronomical Union
سال: 2005
ISSN: 1743-9213,1743-9221
DOI: 10.1017/s1743921305002693