A Census of Narrow C IV Absorption Lines in 24 Quasars at Redshifts 1.9 < z < 4.6

Details A Census of Narrow C IV Absorption Lines in 24 Quasars at Redshifts 1.9 < z < 4.6 A Census of Narrow C IV Absorption Lines in 24 Quasars at Redshifts 1.9 < z < 4.6

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21732605s&link_type=abstract

American Astronomical Society, AAS Meeting #217, #326.05; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astronomy

Scientific paper

We present the first results from a high-resolution spectroscopic survey of 24 quasars to study the nature and origins of the narrow absorption lines (NALs) that form in quasar environments. We present 271 C IV NAL components in 136 C IV systems in 24 quasars at redshifts 1.94 < z < 4.69 between the velocity range of +5000 < v < -40000 km/s. We determine which components and systems are intrinsic to the quasar environment, that is, which lines form in the host galaxy, from the halo to the center near the quasar itself. Some of these intrinsic NALs have high velocities that limit their orgin to quasar outflows. We determine whether a NAL is intrinsic by measuring partial covering in the C IV NALs, and by looking for very broad and smooth NALs. We find that intrinsic NALs are more likely to be slightly broader (mean b = 33.6 km/s) and stronger (mean REW = 0.20 A) than their intervening counterparts (mean b = 21.2 km/s, and mean REW = 0.12 A). Several high-velocity, narrow outflows also appear in our sample. 46% of the quasars in our sample contain at least one intrinsic NAL, with only 30% containing an intrinsic NAL within 5000 km/s of the quasar redshift. Several rich and complex C IV NAL systems are present.

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