scholarly journals Efficient Photometric Selection of Quasars from the Sloan Digital Sky Survey: 100,000 z < 3 Quasars from Data Release One

2004 ◽  
Vol 155 (2) ◽  
pp. 257-269 ◽  
Author(s):  
Gordon T. Richards ◽  
Robert C. Nichol ◽  
Alexander G. Gray ◽  
Robert J. Brunner ◽  
Robert H. Lupton ◽  
...  
Keyword(s):  
Sloan Digital Sky Survey ◽  
Sky Survey ◽  
Data Release ◽  
Selection Of

scholarly journals A photometric selection of white dwarf candidates in Sloan Digital Sky Survey Data Release 10

2015 ◽  
Vol 448 (3) ◽  
pp. 2260-2274 ◽  
Author(s):  
Nicola Pietro Gentile Fusillo ◽  
Boris T. Gänsicke ◽  
Sandra Greiss
Keyword(s):  
Survey Data ◽  
White Dwarf ◽  
Sloan Digital Sky Survey ◽  
Sky Survey ◽  
Data Release ◽  
Selection Of

scholarly journals EFFICIENT PHOTOMETRIC SELECTION OF QUASARS FROM THE SLOAN DIGITAL SKY SURVEY. II. ∼1, 000, 000 QUASARS FROM DATA RELEASE 6

2008 ◽  
Vol 180 (1) ◽  
pp. 67-83 ◽  
Author(s):  
Gordon T. Richards ◽  
Adam D. Myers ◽  
Alexander G. Gray ◽  
Ryan N. Riegel ◽  
Robert C. Nichol ◽  
...  
Keyword(s):  
Sloan Digital Sky Survey ◽  
Sky Survey ◽  
Data Release ◽  
Selection Of

scholarly journals J-PLUS: Identification of low-metallicity stars with artificial neural networks using SPHINX

2019 ◽  
Vol 622 ◽  
pp. A182 ◽  
Author(s):  
D. D. Whitten ◽  
V. M. Placco ◽  
T. C. Beers ◽  
A. L. Chies-Santos ◽  
C. Bonatto ◽  
...  
Keyword(s):  
Globular Cluster ◽  
Effective Temperature ◽  
Spectroscopic Studies ◽  
Sloan Digital Sky Survey ◽  
Intermediate Band ◽  
Medium Resolution ◽  
Sky Survey ◽  
Data Release ◽  
Low Metallicity ◽  
Selection Of

Context. We present a new methodology for the estimation of stellar atmospheric parameters from narrow- and intermediate-band photometry of the Javalambre Photometric Local Universe Survey (J-PLUS), and propose a method for target pre-selection of low-metallicity stars for follow-up spectroscopic studies. Photometric metallicity estimates for stars in the globular cluster M15 are determined using this method. Aims. By development of a neural-network-based photometry pipeline, we aim to produce estimates of effective temperature, Teff, and metallicity, [Fe/H], for a large subset of stars in the J-PLUS footprint. Methods. The Stellar Photometric Index Network Explorer, SPHINX, was developed to produce estimates of Teff and [Fe/H], after training on a combination of J-PLUS photometric inputs and synthetic magnitudes computed for medium-resolution (R ~ 2000) spectra of the Sloan Digital Sky Survey. This methodology was applied to J-PLUS photometry of the globular cluster M15. Results. Effective temperature estimates made with J-PLUS Early Data Release photometry exhibit low scatter, σ(Teff) = 91 K, over the temperature range 4500 < Teff (K) < 8500. For stars from the J-PLUS First Data Release with 4500 < Teff (K) < 6200, 85 ± 3% of stars known to have [Fe/H] < −2.0 are recovered by SPHINX. A mean metallicity of [Fe/H] = − 2.32 ± 0.01, with a residual spread of 0.3 dex, is determined for M15 using J-PLUS photometry of 664 likely cluster members. Conclusions. We confirm the performance of SPHINX within the ranges specified, and verify its utility as a stand-alone tool for photometric estimation of effective temperature and metallicity, and for pre-selection of metal-poor spectroscopic targets.

scholarly journals A New Catalog of Isolated Galaxies

2009 ◽  
Vol 5 (S267) ◽  
pp. 464-464
Author(s):  
J. A. Vázquez-Mata ◽  
H. M. Hernández-Toledo ◽  
Changbom Park ◽  
Yun-Young Choi
Keyword(s):  
Galaxy Formation ◽  
Environmental Effects ◽  
Comparative Studies ◽  
Sloan Digital Sky Survey ◽  
Selection Algorithm ◽  
Isolated Galaxies ◽  
Galaxy Formation And Evolution ◽  
Sky Survey ◽  
Data Release ◽  
Formation And Evolution

We present a new catalog of isolated galaxies (coined as UNAM–KIAS) obtained through an automated systematic search. The 1520 isolated galaxies were found in ~ 1.4 steradians of the sky in the Sloan Digital Sky Survey Data Release 5 (SDSS DR5) photometry. The selection algorithm was implemented from a variation of the criteria developed by Karachentseva (1973), with full redshift information. This new catalog is aimed to carry out comparative studies of environmental effects and constraining the currently competing scenarios of galaxy formation and evolution.

scholarly journals Cross-correlation of the 2XMMi catalogue with Data Release 7 of the Sloan Digital Sky Survey

2011 ◽  
Vol 527 ◽  
pp. A126 ◽  
Author(s):  
F.-X. Pineau ◽  
C. Motch ◽  
F. Carrera ◽  
R. Della Ceca ◽  
S. Derrière ◽  
...  
Keyword(s):  
Cross Correlation ◽  
Sloan Digital Sky Survey ◽  
Sky Survey ◽  
Data Release

scholarly journals Nitrogen-Enriched Quasars in the Sloan Digital Sky Survey First Data Release

2004 ◽  
Vol 128 (2) ◽  
pp. 561-568 ◽  
Author(s):  
Misty C. Bentz ◽  
Patrick B. Hall ◽  
Patrick S. Osmer
Keyword(s):  
Sloan Digital Sky Survey ◽  
Sky Survey ◽  
Data Release

scholarly journals White Dwarf Stars

2017 ◽  
Vol 45 ◽  
pp. 1760023
Author(s):  
S. O. Kepler ◽  
Alejandra Daniela Romero ◽  
Ingrid Pelisoli ◽  
Gustavo Ourique
Keyword(s):  
White Dwarf ◽  
Final Stage ◽  
White Dwarfs ◽  
Sloan Digital Sky Survey ◽  
Dwarf Stars ◽  
Multiple Systems ◽  
White Dwarf Stars ◽  
Sky Survey ◽  
Data Release ◽  
Low Mass

White dwarf stars are the final stage of most stars, born single or in multiple systems. We discuss the identification, magnetic fields, and mass distribution for white dwarfs detected from spectra obtained by the Sloan Digital Sky Survey up to Data Release 13 in 2016, which lead to the increase in the number of spectroscopically identified white dwarf stars from 5[Formula: see text]000 to 39[Formula: see text]000. This number includes only white dwarf stars with [Formula: see text], i.e., excluding the Extremely Low Mass white dwarfs, which are necessarily the byproduct of stellar interaction.

scholarly journals Influences of Galaxy Interactions on AGN Activity

2013 ◽  
Vol 30 ◽  
Author(s):  
Xin-Fa Deng ◽  
Guisheng Yu ◽  
Peng Jiang
Keyword(s):  
Survey Data ◽  
Strong Evidence ◽  
Sloan Digital Sky Survey ◽  
Limited Sample ◽  
Galaxy Interactions ◽  
Opposite Trend ◽  
Main Galaxy ◽  
Isolated Galaxies ◽  
Sky Survey ◽  
Data Release

AbstractUsing two volume-limited Main galaxy samples of the Sloan Digital Sky Survey Data Release 7 , we explore influences of galaxy interactions on AGN activity. It is found that in the faint volume-limited sample, paired galaxies have a slightly higher AGN fraction than isolated galaxies, whereas in the luminous volume-limited sample, an opposite trend can be observed. The significance is <1σ. Thus, we do not observe strong evidence that interactions or mergers likely trigger the AGN activity.

The Mass Function of Void Galaxies in the Sloan Digital Sky Survey Data Release 2

2005 ◽  
Vol 621 (2) ◽  
pp. 643-650 ◽  
Author(s):  
David M. Goldberg ◽  
Timothy D. Jones ◽  
Fiona Hoyle ◽  
Randall R. Rojas ◽  
Michael S. Vogeley ◽  
...  
Keyword(s):  
Survey Data ◽  
Mass Function ◽  
Sloan Digital Sky Survey ◽  
Sky Survey ◽  
Void Galaxies ◽  
Data Release
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