NDLI: A glance at the host galaxy of high-redshift quasars using strong damped Lyman-α systems as coronagraphs

Content Provider	EDP Sciences
Author	Hayley Finley Patrick Petitjean Isabelle Pâris Pasquier Noterdaeme Jonathan Brinkmann Adam D. Myers Nicholas P. Ross Donald P. Schneider Dmitry Bizyaev Howard Brewington Garrett Ebelke Elena Malanushenko Viktor Malanushenko Daniel Oravetz Kaike Pan Audrey Simmons Stephanie Snedden
Abstract	We searched quasar spectra from the SDSS-III Baryon Oscillation Spectroscopic Survey (BOSS) for the rare occurrences where a strong damped Lyman-α absorber (DLA) blocks the Broad Line Region emission from the quasar and acts as a natural coronagraph to reveal narrow Lyα emission from the host galaxy. We define a statistical sample of 31 DLAs in Data Release 9 (DR9) with log N(H i) ≥ 21.3 cm^{-2^{located at less than 1500 km s^{-1^{from the quasar redshift. In 25% (8) of these DLAs, a strong narrow Lyα emission line is observed with flux ~25 × 10^{-17^{erg s^{-1^{cm^{-2^{on average. For DLAs without this feature in their troughs, the average 3-σ upper limit is <0.8 × 10^{-17^{erg s^{-1^{cm^{-2^{. Our statistical sample is nearly 2.5 times larger than the anticipated number of intervening DLAs in DR9 within 1 500 km s^{-1^{of the quasar redshift. We also define a sample of 26 DLAs from DR9 and DR10 with narrow Lyα emission detected and no limit on the H i column density to better characterize properties of the host galaxy emission. Analyzing the statistical sample, we do not find substantial differences in the kinematics, metals, or reddening for the two populations with and without emission detected. The highly symmetric narrow Lyα emission line profile centered in the HI trough indicates that the emitting region is separate from the absorber. The luminosity of the narrow Lyα emission peaks is intermediate between that of Lyα emitters and radio galaxies, implying that the Lyα emission is predominantly due to ionizing radiation from the AGN. Galaxies neighboring the quasar host are likely responsible for the majority (>75%) of these DLAs, with only a minority (<25%) arising from H i clouds located in the AGN host galaxy.}}}}}}}}}}}}}}}}}}
Page Count	18
File Format	HTM / HTML PDF
ISSN	00046361
Alternate Webpage(s)	https://www.aanda.org/articles/aa/abs/2013/10/aa21745-13/aa21745-13.html
e-ISSN	14320746
Journal	Astronomy & Astrophysics
Volume Number	558
DOI	10.1051/0004-6361/201321745
Language	English
Publisher	EDP Sciences
Publisher Date	2013-10-01
Access Restriction	Open
Rights Holder	© ESO, 2013
Subject Keyword	quasars: absorption lines quasars: emission lines quasars: absorption lines / quasars: emission lines
Content Type	Text
Resource Type	Article
Subject	Astronomy and Astrophysics Space and Planetary Science

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