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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…
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…
Perturbation Theory of the Cosmological Log-Density Field
Xin Wang, Mark Neyrinck, István Szapudi +5
The matter density field exhibits a nearly lognormal probability density distribution (PDF) after entering into the nonlinear regime. Recently, it has been shown that the shape of…
Locally Cold Flows from Large-Scale Structure
M. A. Aragon-Calvo, J. Silk, A. S. Szalay
We show that the "cold" Hubble flow observed for galaxies around the Milky Way does not represent a problem in cosmology but is due to the particular geometry and dynamics of our l…