Damped and sub-damped Lyman-α absorbers in z > 4 QSOs
نویسندگان
چکیده
منابع مشابه
First Investigation of the Clustering Environment of Damped Lyman Α Absorbers at Z ≃ 4
We report the first observations of the clustering environment of damped Lyman α absorption systems at z ≃ 4. Color selection and photometric redshifts were used to identify 46 candidate Lyman-break galaxies from deep BRI images of the field containing the quasar BR 0951−04. Spectroscopic confirmation of 10 Lyman-break galaxies indicates that half of this population may be missed by color selec...
متن کاملAbundance of damped Lyman-α absorbers in cosmological SPH simulations
We use cosmological smoothed-particle hydrodynamics (SPH) simulations of the Λ cold dark matter (CDM) model to study the abundance of damped Lyman-α absorbers (DLAs) in the redshift range z = 0 − 4.5. We compute the cumulative DLA abundance by using the relation between DLA cross-section and the total halo mass inferred from the simulations. Our approach includes standard radiative cooling and ...
متن کاملDamped Lyman-α absorbers as a probe of stellar feedback
We examine the abundance, clustering and metallicity of Damped Lyman-α Absorbers (DLAs) in a suite of hydrodynamic cosmological simulations using the moving mesh code AREPO . We incorporate models of supernova and AGN feedback, as well as molecular hydrogen formation. We compare our simulations to the column density distribution function at z = 3, the total DLA abundance at z = 2 − 4, the measu...
متن کاملFirst Investigation of the Clustering Environment of Damped Lyman Α Absorbers at Z ≃
We report the first observations of the clustering environment of damped Lyman α absorption systems at z ≃ 4. Color selection and photometric redshifts were used to select 44 candidate Lyman-break galaxies brighter than IAB = 25.5 from deep BRI images of the 35 arcmin 2 field containing the quasar BR 0951−04. Multislit spectroscopy of 35 candidate galaxies was performed and 8 of these candidate...
متن کاملThe star - formation rate of Ca II and damped Lyman - α absorbers at 0 . 4 < z < 1
Using stacked Sloan Digital Sky Survey spectra, we present the detection of [O II]λλ3727,3730 nebular emission from the galaxies hosting Ca II absorption line systems and galaxies hosting Mg II-selected damped Lyman-α (DLA) absorbers. Both samples of absorbers, 345 Ca II systems and 3461 Mg II-selected DLA systems, span the redshift interval 0.4 6 zabs < 1.3; all of the former and half the latt...
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ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2009
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361/200811541