The 2dF Galaxy Redshift Survey: spectral types and luminosity functions
| Autor: | Russell D. Cannon, Nick Kaiser, George Efstathiou, William J. Sutherland, Matthew Colless, Gavin Dalton, Ian Lewis, Stuart Lumsden, Keith Taylor, Chris A. Collins, Karl Glazebrook, Carlos S. Frenk, Simon P. Driver, Ofer Lahav, Richard S. Ellis, Shaun Cole, Kathryn Deeley, John A. Peacock, Bruce A. Peterson, Joss Bland-Hawthorn, Warrick J. Couch, Shai Ronen, Stephen J. Maddox, S. R. Folkes, Ian Price |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
2dF Galaxy Redshift Survey
Physics 010504 meteorology & atmospheric sciences Astrophysics (astro-ph) FOS: Physical sciences Astronomy and Astrophysics Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Stellar classification 01 natural sciences Omega Spectral line Galaxy Luminosity Space and Planetary Science 0103 physical sciences Magnitude (astronomy) 010303 astronomy & astrophysics Astrophysics::Galaxy Astrophysics 0105 earth and related environmental sciences Luminosity function (astronomy) |
| Zdroj: | Scopus-Elsevier |
| DOI: | 10.1046/j.1365-8711.1999.02721.x |
| Popis: | We describe the 2dF Galaxy Redshift Survey (2dFGRS), and the current status of the observations. In this exploratory paper, we apply a Principal Component Analysis to a preliminary sample of 5869 galaxy spectra and use the two most significant components to split the sample into five spectral classes. These classes are defined by considering visual classifications of a subset of the 2dF spectra, and also by comparing to high quality spectra of local galaxies. We calculate a luminosity function for each of the different classes and find that later-type galaxies have a fainter characteristic magnitude, and a steeper faint-end slope. For the whole sample we find M*=-19.7 (for Omega=1, H_0=100 km/sec/Mpc), alpha=-1.3, phi*=0.017. For class 1 (`early-type') we find M*=-19.6, alpha=-0.7, while for class 5 (`late-type') we find M*=-19.0, alpha=-1.7. The derived 2dF luminosity functions agree well with other recent luminosity function estimates. Comment: 15 pages, 14 ps and eps figures, Latex, MNRAS, accepted |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|