Direct observational test rules out small Mg II absorbers
نویسندگان
چکیده
منابع مشابه
Direct Observational Test Rules Out Small Mg ii Absorbers
Recent observations suggest the incidence of strong intervening Mg ii absorption systems along the line-of-sight to gamma ray burst (GRB) afterglows is significantly higher than expected from analogous quasar sightlines. One possible explanation is a geometric effect, arising because Mg ii absorbers only partially cover the quasar continuum regions, in which case Mg ii absorbers must be conside...
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We present an analysis of the chemical and ionization conditions in a sample of 100 weak Mg ii absorbers identified in the VLT/UVES archive of quasar spectra. In addition to Mg ii, we present equivalent width and column density measurements of other low ionization species such as Mg i, Fe ii, Al ii, C ii, Si ii and also Al iii. We find that the column densities of C ii and Si ii are strongly co...
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We study the cross-correlation between 212 Mg II quasar absorption systems and ∼ 20,000 Luminous Red Galaxies (LRGs) selected from the Sloan Digital Sky Survey Data Release 1 in the redshift range 0.46 z6 0.8. The Mg II systems were selected to have λλ2796 & 2803 rest-frame equivalent widths >1.0 Å and identifications confirmed by the Fe II λ2600 or Mg I λ2852 lines. Over comoving scales 0.05–1...
متن کاملThe Baryon Content of Dark Matter Halos: Empirical Constraints from Mg Ii Absorbers
We study the extent and covering fraction of cool baryons around galaxies of different luminosity and mass, based on a survey of Mg II λλ2796,2803 absorption features near known galaxies. The initial sample consists of 13 galaxy and absorber pairs and 10 galaxies that do not produce Mg II absorption lines to within sensitive upper limits. The redshifts of the galaxy and absorber pairs range fro...
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We report a correlation between velocity offset (β = v/c) of strong Mg II absorption systems and the bolometric luminosity (Lbol) of quasars in SDSS-DR7. We find that β shows a powerlaw increase with Lbol, with a slope ∼1/4. We find that such a relation of β with Lbol is expected for outflows driven by scattering of black hole radiation by dust grains, and which are launched from the innermost ...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society: Letters
سال: 2007
ISSN: 1745-3925,1745-3933
DOI: 10.1111/j.1745-3933.2007.00377.x