CATALOG OF NARROW C IV ABSORPTION LINES IN BOSS. I. QUASARS WITH
                    <i>z</i>
                    <sub>em</sub>
                    ⩽ 2.4

Chen, Zhi-Fu; Qin, Yi-Ping; Qin, Ming; Pan, Cai-Juan; Pan, Da-Sheng

doi:10.1088/0067-0049/210/1/7

Cited by 11 publications

(2 citation statements)

References 42 publications

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“…Most of the absorption line groups (e.g., Quider et al 2011;Cooksey et al 2013;Seyffert et al 2013;Zhu & Ménard 2013;Raghunathan et al 2016) mainly focused on intervening absorptions in their programs that systematically searched for metal absorptions on the SDSS quasar spectra. Using the first data release of the BOSS (the ninth data release of the SDSS), which includes 87 822 unique quasar spectra (DR9Q; Pâris et al 2012), a series works of our absorption line group (e.g., Chen et al 2014aChen et al ,b, 2015Chen et al , 2016 were designed to search for metal absorptions on quasar spectra, and have produced, up to today, the largest absorption catalogs that contain not only associated but also intervening Mg II or C IV NALs. This provides us an excellent data set to statistically analyze the properties of quasar-associated NALs.…”

Section: Introductionmentioning

confidence: 99%

Collective Properties of Quasar Narrow Associated Absorption Lines

Chen

Pan²

2017

ApJ

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This paper statistically investigates the properties of C IV and Mg II narrow absorption lines (NALs) to look for velocity cuts that can well constrain quasar-associated NALs. The coverage fraction ( f c ) is defined as the ratio between the number of quasars exhibiting at least one detected absorber and the total number of quasars that can be used to detect absorptions with given criteria. We find that, for both C IV and Mg II absorbers, both the number density of absorbers in given velocity intervals (dn/dβ) and the f c show very significant excess at the low-velocity offset from the quasars, relative to the random occurrence that is expected for cosmologically intervening absorbers. These relative excess extensions for Mg II absorptions are not only evidently related to absorption strength but also to quasar luminosity, while they are mainly constrained within 2000 km s . Turning to C IV absorptions, the relative excess extensions of both dn/dβ and f c are mainly limited within v abs < 4000 km s, and depend neither on absorption strength nor on quasar luminosity. And also, the absorbers with v abs < 4000 km sshow obviously different redshift number density evolution from those with v abs > 4000 km s −1. We suggest velocity cuts of 4000 km s to define quasar C IV and Mg II associated NALs, respectively.

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Section: Introductionmentioning

confidence: 99%

Collective Properties of Quasar Narrow Associated Absorption Lines

Chen

Pan²

2017

ApJ

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“…We intend to search for narrow absorption doublets (e.g., Mg IIλλ2796, 2803, and C IVλλ1548, 1551 in the BOSS quasar spectra. In the first paper, Chen et al (2014aChen et al ( , 2014b; hereafter, the two papers are referred to asPaper I), we fo-cused on narrow C IV absorption doublets. Paper I concerned those quasars with z em ≤ 2.4 and a high signal-to-noise ratio (S/N) for their spectra.…”

Section: Introductionmentioning

confidence: 99%

Catalog of narrow C IV absorption lines in BOSS (II): for quasars with zem > 2.4

Chen,

Qin,

Qin

et al. 2014

Preprint

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As the second work in a series of papers aiming to detect absorption systems in the quasar spectra of the Baryon Oscillation Spectroscopic Survey, we continue the analysis of Paper I by expanding the quasar sample to those quasars with z em > 2.4. This yields a sample of 21,963 appropriate quasars to search for narrow C IVλλ1548, 1551 absorptions with W r ≥ 0.2 Å for both lines. There are 9708 quasars with at least one appropriate absorption system imprinted on their spectra. From these spectra, we detect 13,919 narrow Civabsorption systems whose absorption redshifts cover a range of z abs = 1.8784 -4.3704. In this paper and Paper 1, we have selected 37,241 appropriate quasars with median SNR ≥ 4 and 1.54 z em 5.16 to visually analyze narrow C IVλλ1548, 1551 absorption doublets one by one. A total of 15,999 quasars are found to have at least one appropriate absorption system imprinted on their spectra. From these 15,999 quasar spectra, we have detected 23,336 appropriate C IVλλ1548, 1551 absorption systems with W r ≥ 0.2 Åwhose absorption redshifts cover a range of z abs = 1.4544 -4.3704. The largest values of W r are 3.19 Å for the λ1548 absorption line and 2.93 Å for the λ1551 absorption line, respectively. We find that only a few absorbers show large values of W r . About 1.1% absorbers of the total absorbers have W r λ1548 ≥ 2.0 Å.

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CATALOG OF NARROW C IV ABSORPTION LINES IN BOSS. II. FOR QUASARS WITH Z _em > 2.4

Chen¹,

Qin²,

Qin³

et al. 2014

ApJS

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CATALOG OF NARROW C IV ABSORPTION LINES IN BOSS. I. QUASARS WITH z _em ⩽ 2.4

Cited by 11 publications

References 42 publications

Collective Properties of Quasar Narrow Associated Absorption Lines

Collective Properties of Quasar Narrow Associated Absorption Lines

Catalog of narrow C IV absorption lines in BOSS (II): for quasars with zem > 2.4

CATALOG OF NARROW C IV ABSORPTION LINES IN BOSS. II. FOR QUASARS WITH Z _em > 2.4

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CATALOG OF NARROW C IV ABSORPTION LINES IN BOSS. I. QUASARS WITH z em ⩽ 2.4

Cited by 11 publications

References 42 publications

Collective Properties of Quasar Narrow Associated Absorption Lines

Collective Properties of Quasar Narrow Associated Absorption Lines

Catalog of narrow C IV absorption lines in BOSS (II): for quasars with zem > 2.4

CATALOG OF NARROW C IV ABSORPTION LINES IN BOSS. II. FOR QUASARS WITH Z em > 2.4

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CATALOG OF NARROW C IV ABSORPTION LINES IN BOSS. I. QUASARS WITH z _em ⩽ 2.4

CATALOG OF NARROW C IV ABSORPTION LINES IN BOSS. II. FOR QUASARS WITH Z _em > 2.4