scholarly journals MMT Observations of New Extremely Metal‐poor Emission‐Line Galaxies in the Sloan Digital Sky Survey

2007 ◽  
Vol 665 (2) ◽  
pp. 1115-1128 ◽  
Author(s):  
Yuri I. Izotov ◽  
Trinh X. Thuan
Keyword(s):  
Emission Line ◽  
Sloan Digital Sky Survey ◽  
Sky Survey ◽  
Emission Line Galaxies

scholarly journals Spectral classification of emission-line galaxies from the Sloan Digital Sky Survey

2011 ◽  
Vol 531 ◽  
pp. A71 ◽  
Author(s):  
J. Marocco ◽  
E. Hache ◽  
F. Lamareille
Keyword(s):  
Emission Line ◽  
Sloan Digital Sky Survey ◽  
Spectral Classification ◽  
Sky Survey ◽  
Emission Line Galaxies

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

2019 ◽  
Vol 625 ◽  
pp. A56 ◽  
Author(s):  
Romain A. Meyer ◽  
Timothée Delubac ◽  
Jean-Paul Kneib ◽  
Frédéric Courbin
Keyword(s):  
Emission Line ◽  
Sloan Digital Sky Survey ◽  
Emission Lines ◽  
Gravitational Lenses ◽  
Stellar Objects ◽  
Sky Survey ◽  
Quasi Stellar Objects ◽  
Unique Approach ◽  
Algorithmic Search ◽  
Emission Line Galaxies

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-α 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-α emitter (LAE). The QSO-ELG (QSO-LAE) lens candidates have QSO lens redshifts in the range 0.24 ≲ zQSO ≲ 0.66 (0.75 ≲ zQSO ≲ 1.23 ) and background galaxy redshifts in the range 0.48 ≲ zS, ELG ≲ 0.94 (2.17 ≲ zS, LAE ≲ 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.

scholarly journals DOUBLE-PEAKED NARROW EMISSION-LINE GALAXIES FROM THE SLOAN DIGITAL SKY SURVEY. I. SAMPLE AND BASIC PROPERTIES

2012 ◽  
Vol 201 (2) ◽  
pp. 31 ◽  
Author(s):  
Jun-Qiang Ge ◽  
Chen Hu ◽  
Jian-Min Wang ◽  
Jin-Ming Bai ◽  
Shu Zhang
Keyword(s):  
Emission Line ◽  
Sloan Digital Sky Survey ◽  
Basic Properties ◽  
Sky Survey ◽  
Emission Line Galaxies ◽  
Narrow Emission

scholarly journals Abundance patterns in the low-metallicity emission-line galaxies from the Early Data Release of the Sloan Digital Sky Survey

2004 ◽  
Vol 415 (1) ◽  
pp. 87-94 ◽  
Author(s):  
Y. I. Izotov ◽  
G. Stasińska ◽  
N. G. Guseva ◽  
T. X. Thuan
Keyword(s):  
Emission Line ◽  
Sloan Digital Sky Survey ◽  
Early Data ◽  
Abundance Patterns ◽  
Sky Survey ◽  
Data Release ◽  
Low Metallicity ◽  
Emission Line Galaxies

scholarly journals A support vector machine for spectral classification of emission-line galaxies from the Sloan Digital Sky Survey

2015 ◽  
Vol 453 (1) ◽  
pp. 122-127 ◽  
Author(s):  
Fei Shi ◽  
Yu-Yan Liu ◽  
Guang-Lan Sun ◽  
Pei-Yu Li ◽  
Yu-Ming Lei ◽  
...  
Keyword(s):  
Support Vector Machine ◽  
Emission Line ◽  
Sloan Digital Sky Survey ◽  
Support Vector ◽  
Spectral Classification ◽  
Sky Survey ◽  
Emission Line Galaxies

scholarly journals The chemical composition of metal-poor emission-line galaxies in the Data Release 3 of the Sloan Digital Sky Survey

2006 ◽  
Vol 448 (3) ◽  
pp. 955-970 ◽  
Author(s):  
Y. I. Izotov ◽  
G. Stasińska ◽  
G. Meynet ◽  
N. G. Guseva ◽  
T. X. Thuan
Keyword(s):  
Chemical Composition ◽  
Emission Line ◽  
Sloan Digital Sky Survey ◽  
Sky Survey ◽  
Data Release ◽  
Emission Line Galaxies

scholarly journals Hunting for extremely metal-poor emission-line galaxies in the Sloan Digital Sky Survey: MMT and 3.5 m APO observations

2012 ◽  
Vol 546 ◽  
pp. A122 ◽  
Author(s):  
Y. I. Izotov ◽  
T. X. Thuan ◽  
N. G. Guseva
Keyword(s):  
Emission Line ◽  
Sloan Digital Sky Survey ◽  
Sky Survey ◽  
Emission Line Galaxies

scholarly journals Two extremely metal-poor emission-line galaxies in the Sloan Digital Sky Survey

2006 ◽  
Vol 454 (1) ◽  
pp. 137-141 ◽  
Author(s):  
Y. I. Izotov ◽  
P. Papaderos ◽  
N. G. Guseva ◽  
K. J. Fricke ◽  
T. X. Thuan
Keyword(s):  
Emission Line ◽  
Sloan Digital Sky Survey ◽  
Sky Survey ◽  
Emission Line Galaxies

scholarly journals Spectral classification indicators of emission-line galaxies from the Sloan Digital Sky Survey

2015 ◽  
Vol 451 (1) ◽  
pp. 629-633 ◽  
Author(s):  
Fei Shi ◽  
Yu-Yan Liu ◽  
Pei-Yu Li ◽  
Ming Yu ◽  
Yu-Ming Lei ◽  
...  
Keyword(s):  
Emission Line ◽  
Sloan Digital Sky Survey ◽  
Spectral Classification ◽  
Sky Survey ◽  
Emission Line Galaxies
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