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27 April 2024 |
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A Homogeneous Sample of Sub-DLAs IV: Global Metallicity Evolution | | Celine Peroux
; Miroslava Dessauges-Zavadsky
; Sandro D'Odorico
; Tae-Sun Kim
; Richard G. McMahon
; | | Date: |
18 Jul 2007 | | Abstract: | An accurate method to measure the abundance of high-redshift galaxies
consists in the observation of absorbers along the line of sight toward a
background quasar. Here, we present abundance measurements of 13 z>3 sub-Damped
Lyman-alpha Systems (quasar absorbers with HI column density 19 < log N(HI) <
20.3 cm^-2) based on the high resolution observations with VLT UVES
spectrograph. These observations more than double the metallicity information
for sub-DLAs previously available at z>3. This new data, combined with other
sub-DLA measurements from the literature, confirm the stronger metallicity
redshift evolution than for the classical Damped Lyman-alpha absorbers.
Besides, these observations are used to compute for the first time the fraction
of gas ionised from photo-ionisation modelling in a sample of sub-DLAs. Based
on these results, we calculate that sub-DLAs contribute no more than 6% of the
expected amount of metals at z~2.5. We therefore conclude that even if sub-DLAs
are found to be more metal-rich than classical DLAs, they are insufficient to
close the so-called ``missing metals problem’’. | | Source: | arXiv, 0707.2697 | | Services: | Forum | Review | PDF | Favorites | |
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