Keresés
1 találatból megjelenítve: 11-21
Cím: Reliable eigenspectra for new generation surveys
Szerző: ; ; ; ;
Dátum: 2009
Feltöltve: 2020-08-11
(2009)
We present a novel technique to overcome the limitations of the applicability of principal component analysis to typical real-life data sets, especially astronomical spectra. Our new approach addresses the issues of outliers, ...
Cím: Adalékok a jeruzsálemi Magyar Intézet történetéhez
Szerző:
Dátum: 2021
Feltöltve: 2021-06-11
(2021)
Cím: CROSS IDENTIFICATION OF STARS WITH UNKNOWN PROPER MOTIONS
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Dátum: 2010
Feltöltve: 2020-08-11
(2010)
The cross identification of sources in separate catalogs is one of the most basic tasks in observational astronomy. It is, however, surprisingly difficult and generally ill defined. Recently, Budavari & Szalay formulated ...
Cím: PROBING SPECTROSCOPIC VARIABILITY OF GALAXIES AND NARROW-LINE ACTIVE GALACTIC NUCLEI IN THE SLOAN DIGITAL SKY SURVEY
Szerző: ; ; ; ; ; ; ; ; ; ; Csabai, I; Wyse, RFG; Ivezic, Z
Dátum: 2009
Feltöltve: 2020-08-11
(2009)
Under the unified model for active galactic nuclei (AGNs), narrow-line (Type 2) AGNs are, in fact, broadline (Type 1) AGNs but each with a heavily obscured accretion disk. We would therefore expect the optical continuum ...
Cím: REJUVENATING THE MATTER POWER SPECTRUM: RESTORING INFORMATION WITH A LOGARITHMIC DENSITY MAPPING
Szerző: ; ;
Dátum: 2009
Feltöltve: 2020-08-11
(2009)
We find that nonlinearities in the dark matter power spectrum are dramatically smaller if the density field first undergoes a logarithmic mapping. In the Millennium simulation, this procedure gives a power spectrum with a ...
Cím: EXTINCTION IN STAR-FORMING DISK GALAXIES FROM INCLINATION-DEPENDENT COMPOSITE SPECTRA
Szerző: ; ; ; ; ;
Dátum: 2010
Feltöltve: 2020-08-11
(2010)
Extinction in galaxies affects their observed properties. In scenarios describing the distribution of dust and stars in individual disk galaxies, the amplitude of the extinction can be modulated by the inclination of the ...
Cím: Distribution of maximal luminosity of galaxies in the Sloan Digital Sky Survey
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Dátum: 2012
Feltöltve: 2020-08-11
(2012)
Extreme value statistics is applied to the distribution of galaxy luminosities in the Sloan Digital Sky Survey. We analyze the DR8 Main Galaxy Sample (MGS), as well as the luminous red galaxies (LRGs). Maximal luminosities ...
Cím: CORRELATIONS BETWEEN NEBULAR EMISSION AND THE CONTINUUM SPECTRAL SHAPE IN SDSS GALAXIES
Szerző: ; ; ; ;
Dátum: 2011
Feltöltve: 2020-08-11
(2011)
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 principal component analysis, we found that the ...
Cím: A high-resolution atlas of composite Sloan Digital Sky Survey galaxy spectra
Szerző: ; ; ; ; ;
Dátum: 2012
Feltöltve: 2020-08-11
(2012)
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, nuclear activity and star formation activity ...
Cím: Objective identification of informative wavelength regions in galaxy spectra
Szerző: ; ; ; ; ; ;
Dátum: 2014
Feltöltve: 2020-08-10
(2014)
Understanding the diversity in spectra is the key to determining the physical parameters of galaxies. The optical spectra of galaxies are highly convoluted with continuum and lines that are potentially sensitive to different ...