Optical properties and spatial distribution of MgII absorbers from SDSS image stacking

Details Optical properties and spatial distribution of MgII absorbers from SDSS image stacking Optical properties and spatial distribution of MgII absorbers from SDSS image stacking

2006-09-27

arxiv.org/abs/astro-ph/0609760v2

Astrophys.J.658:161-184,2007

Astronomy and Astrophysics

Astrophysics

ApJ in press, 28 pages, 16 figures, using emulateapj. Only typo corrections wrt the original submission (v1)

Scientific paper

10.1086/511300

We present a statistical analysis of the photometric properties and spatial distribution of more than 2,800 MgII absorbers with 0.370.8\AA detected in SDSS quasar spectra. Using an improved image stacking technique, we measure the cross-correlation between MgII gas and light (in the g, r, i and z-bands) from 10 to 200 kpc and infer the light-weighted impact parameter distribution of MgII absorbers. Such a quantity is well described by a power-law with an index that strongly depends on W_0, ranging from ~-1 for W_0<~1\AA to ~-2 for W_0>~ 1.5\AA. At redshift 0.37

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