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A Metal-Strong and Dust-Rich Damped lya Absorption System toward the Quasar SDSS J115705.52+615521.7 | | Wang Jian-Guo
; Zhou Hong-Yan
; Ge Jian
; Jiang Peng
; Lu Hong-Lin
; Prochaska Jason Xavier
; Hamann Fred
; Wang Hui-Yuan
; Wang Ting-Gui
; Yuan WeiMin
; | | Date: |
3 Oct 2012 | | Abstract: | (Abridged for arXiv) We report the discovery of an unusual, extremely
dust-rich and metal-strong damped lya absorption system (DLA) at a redshift
$z_{a}=2.4596$ toward the quasar SDSS J115705.52+615521.7 (hereafter
J1157+6155) with an emission-line redshift $z_{e}=2.5125$. Its neutral hydrogen
column density $N_{hi} = 10^{21.8pm0.2}$ cm$^{-2}$ is among the highest
values measured in quasar DLAs. The measured metal column density is
$N_{ZnII}approx 10^{13.8}$ cm$^{-2}$, which is about 1.5 times larger than the
largest value in any previously observed quasar DLAs. The best-fit curve is a
MW-like law with a significant broad feature centered around 2175 {AA} in the
rest frame of the absorber. The measured extinction $A_V approx 0.92$ mag is
unprecedentedly high in quasar DLAs. After applying an extinction correction,
the $i$ band absolute magnitude of the quasar is as high as $M_{i} approx
-29.4$ mag, placing it one of the most luminous quasars ever known. This
discovery is suggestive of the existence of a rare yet important population of
dust-rich DLAs with both high metallicities and high column densities, which
may have significant impact on the measurement of the cosmic evolution of
neutral gas mass density and metallicity. | | Source: | arXiv, 1210.1154 | | Services: | Forum | Review | PDF | Favorites | |
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