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Straightening the Density-Displacement Relation with a Logarithmic Transform
Bridget L. Falck, Mark C. Neyrinck, Miguel A. Aragon-Calvo +2
We investigate the use of a logarithmic density variable in estimating the Lagrangian displacement field, motivated by the success of a logarithmic transformation in restoring info…
A High Resolution Atlas of Composite SDSS Galaxy Spectra
László Dobos, István Csabai, Ching-Wa Yip +3
In this work we present an atlas of composite spectra of galaxies based on the data of the Sloan Digital Sky Survey Data Release 7 (SDSS DR7). Galaxies are classified by colour, nu…
Correlations between Nebular Emission and the Continuum Spectral Shape in SDSS Galaxies
Zsuzsanna Győry, Alexander S. Szalay, Tamás Budavári +2
We present a statistical study of the correlations and dimensionality of emission lines carried out on a sample of over 40,000 Sloan Digital Sky Survey (SDSS) galaxies. Using princ…
Array Requirements for Scientific Applications and an Implementation for Microsoft SQL Server
László Dobos, Alexander Szalay, José Blakeley +6
This paper outlines certain scenarios from the fields of astrophysics and fluid dynamics simulations which require high performance data warehouses that support array data type. A…
Extinction in Nebular Luminosities & Star Formation Rate of Disk Galaxies: Inclination Correction
Ching-Wa Yip, Alex S. Szalay
Star formation is one of the most important processes in galaxy formation. The luminosity of Halpha recombination and [OII] forbidden emissions remain to be most used in measuring…
IVOA Recommendation: IVOA Astronomical Data Query Language Version 2.00
Inaki Ortiz, Jeff Lusted, Pat Dowler +8
This document describes the Astronomical Data Query Language (ADQL). ADQL has been developed based on SQL92. This document describes the subset of the SQL grammar supported by ADQL…