scholarly journals Galaxy Star Formation as a Function of Environment in the Early Data Release of the Sloan Digital Sky Survey

2003 ◽  
Vol 584 (1) ◽  
pp. 210-227 ◽  
Author(s):  
Percy L. Gomez ◽  
Robert C. Nichol ◽  
Christopher J. Miller ◽  
Michael L. Balogh ◽  
Tomotsugu Goto ◽  
...  
Keyword(s):  
Star Formation ◽  
Sloan Digital Sky Survey ◽  
Early Data ◽  
Sky Survey ◽  
Data Release

Further Investigation of the Effect of Galaxy Interactions on Star Formation

2013 ◽  
Vol 22 (2) ◽  
Author(s):  
Xin-Fa Deng ◽  
Fuyang Zhang
Keyword(s):  
Star Formation ◽  
Survey Data ◽  
Control Sample ◽  
Sloan Digital Sky Survey ◽  
Apparent Magnitude ◽  
Galaxy Interactions ◽  
Main Galaxy ◽  
Sky Survey ◽  
Data Release ◽  
Galaxy Sample

AbstractFrom the apparent magnitude-limited the Main galaxy sample of the Sloan Digital Sky Survey Data Release 7, we construct a paired galaxy sample and a control sample without close companions with the projected separations

A New Approach to Galaxy Morphology. I. Analysis of the Sloan Digital Sky Survey Early Data Release

2003 ◽  
Vol 588 (1) ◽  
pp. 218-229 ◽  
Author(s):  
Roberto G. Abraham ◽  
Sidney van den Bergh ◽  
Preethi Nair
Keyword(s):  
Sloan Digital Sky Survey ◽  
Early Data ◽  
New Approach ◽  
Sky Survey ◽  
Data Release ◽  
Galaxy Morphology

scholarly journals Magnetic white dwarfs in the Early Data Release of the Sloan Digital Sky Survey

2002 ◽  
Vol 394 (3) ◽  
pp. 957-963 ◽  
Author(s):  
B. T. Gänsicke ◽  
F. Euchner ◽  
S. Jordan
Keyword(s):  
White Dwarfs ◽  
Sloan Digital Sky Survey ◽  
Early Data ◽  
Sky Survey ◽  
Data Release

The Sloan Digital Sky Survey Quasar Catalog. I. Early Data Release

2002 ◽  
Vol 123 (2) ◽  
pp. 567-577 ◽  
Author(s):  
Donald P. Schneider ◽  
Gordon T. Richards ◽  
Xiaohui Fan ◽  
Patrick B. Hall ◽  
Michael A. Strauss ◽  
...  
Keyword(s):  
Sloan Digital Sky Survey ◽  
Early Data ◽  
Sky Survey ◽  
Data Release

scholarly journals ERRATUM: “PARTIALLY OBSCURED QUASARS IN THE SLOAN DIGITAL SKY SURVEY EARLY DATA RELEASE” (2005, ApJ, 620, 629)

2009 ◽  
Vol 703 (2) ◽  
pp. 2291-2291
Author(s):  
Xiao-Bo Dong ◽  
Hong-Yan Zhou ◽  
Ting-Gui Wang ◽  
Jun-Xian Wang ◽  
Cheng Li ◽  
...  
Keyword(s):  
Sloan Digital Sky Survey ◽  
Early Data ◽  
Sky Survey ◽  
Data Release

scholarly journals Placing LOFAR-detected quasars in C iv emission space: implications for winds, jets and star formation

2021 ◽  
Vol 502 (3) ◽  
pp. 4154-4169
Author(s):  
Amy L Rankine ◽  
James H Matthews ◽  
Paul C Hewett ◽  
Manda Banerji ◽  
Leah K Morabito ◽  
...  
Keyword(s):  
Star Formation ◽  
Low Frequency ◽  
Sloan Digital Sky Survey ◽  
Baldwin Effect ◽  
Ultraviolet Emission ◽  
X Ray ◽  
Bolometric Luminosity ◽  
Radio Detection ◽  
Sky Survey ◽  
Data Release

ABSTRACT We present an investigation of the low-frequency radio and ultraviolet properties of a sample of ≃10 500 quasars from the Sloan Digital Sky Survey Data Release 14, observed as part of the first data release of the Low-Frequency-Array Two-metre Sky Survey. The quasars have redshifts 1.5 < z < 3.5 and luminosities $44.6 \lt \log _{10}\left(L_{\text{bol}}/\rm{erg\,s}^{-1}\right) \lt 47.2$. We employ ultraviolet spectral reconstructions based on an independent component analysis to parametrize the C iv λ1549-emission line that is used to infer the strength of accretion disc winds, and the He ii λ1640 line, an indicator of the soft X-ray flux. We find that radio-detected quasars are found in the same region of C iv blueshift versus equivalent-width space as radio-undetected quasars, but that the loudest, most luminous and largest radio sources exist preferentially at low C iv blueshifts. Additionally, the radio-detection fraction increases with blueshift whereas the radio-loud fraction decreases. In the radio-quiet population, we observe a range of He ii equivalent widths as well as a Baldwin effect with bolometric luminosity, whilst the radio-loud population has mostly strong He ii, consistent with a stronger soft X-ray flux. The presence of strong He ii is a necessary but not sufficient condition to detect radio-loud emission suggesting some degree of stochasticity in jet formation. Using energetic arguments and Monte Carlo simulations, we explore the plausibility of winds, compact jets, and star formation as sources of the radio quiet emission, ruling out none. The existence of quasars with similar ultraviolet properties but differing radio properties suggests, perhaps, that the radio and ultraviolet emission is tracing activity occurring on different time-scales.

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