Quasi-stellar objects acting as potential strong gravitational lenses in the SDSS-III BOSS survey

被引：6

作者：

Meyer, Romain A. ^{[1
,2
]}

Delubac, Timothee ^{[1
]}

Kneib, Jean-Paul ^{[1
,3
]}

Courbin, Frederic ^{[1
]}

机构：

[1] Ecole Polytech Fed Lausanne, Inst Phys, Lab Astrophys, CH-1015 Lausanne, Switzerland

[2] UCL, Dept Phys & Astron, Gower St, London WC1E 6BT, England

[3] Aix Marseille Univ, CNRS, LAM, UMR 7326, F-13388 Marseille, France

来源：

ASTRONOMY & ASTROPHYSICS | 2019年 / 625卷

基金：

美国国家科学基金会; 瑞士国家科学基金会; 美国安德鲁·梅隆基金会;

关键词：

gravitational lensing: strong; methods: data analysis; surveys; quasars: general; ALL-SKY SURVEY; CANDIDATE SELECTION; ACS SURVEY; DISCOVERY; SEARCH; MODELS;

D O I：

10.1051/0004-6361/201834978

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present a sample of 12 quasi-stellar objects (QSOs) that potentially act as strong gravitational lenses on background emission line galaxies (ELG) or Lyman-alpha emitters (LAEs) selected through a systematic search of the 297 301 QSOs in the Sloan Digital Sky Survey (SDSS)-III Data Release 12. Candidates were identified by looking for compound spectra, where emission lines at a redshift larger than that of the quasar can be identified in the residuals after a QSO spectral template is subtracted from the observed spectra. The narrow diameter of BOSS fibers (2 '') then ensures that the object responsible for the additional emission lines must lie close to the line of sight of the QSO and hence provides a high probability of lensing. Among the 12 candidates identified, nine have definite evidence for the presence of a background ELG identified by at least four higher-redshift nebular emission lines. The remaining three probable candidates present a strong asymmetrical emission line attributed to a background Lyman-alpha emitter (LAE). The QSO-ELG (QSO-LAE) lens candidates have QSO lens redshifts in the range 0.24 less than or similar to Z(QSO) less than or similar to 0.66 (0.75 less than or similar to Z(QSO) less than or similar to 1.23 ) and background galaxy redshifts in the range 0.48 less than or similar to Z(S,)(ELG) less than or similar to 0.94 (2.17 less than or similar to Z(S,LAE )less than or similar to 4.48). We show that the algorithmic search is complete at >90% for QSO-ELG systems, whereas it falls at 40-60% for QSO-LAE, depending on the redshift of the source. Upon confirmation of the lensing nature of the systems, this sample may quadruple the number of known QSOs acting as strong lenses. We have determined the completeness of our search, which allows future studies to compute lensing probabilities of galaxies by QSOs and differentiate between different QSO models. Future imaging of the full sample and lens modelling offers a unique approach to study and constrain key properties of QSOs.

引用

页数：12

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