The Deep Evolutionary Exploratory Probe 2 Galaxy Redshift Survey: The Galaxy Luminosity Function toz ∼ 1
| Autor: | Andrew C. Phillips, Nick Kaiser, L. Lin, David C. Koo, S. M. Faber, Alison L. Coil, Brian F. Gerke, Michael Davis, Susan A. Kassin, Darren Madgwick, J. A. Newman, Michael C. Cooper, Christopher N. A. Willmer, A. J. Connolly, C. Conroy, N. P. Konidaris, Douglas P. Finkbeiner, Kai G. Noeske, Renbin Yan, Benjamin J. Weiner, Puragra Guhathakurta, Justin Harker, G. A. Luppino |
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| Rok vydání: | 2006 |
| Předmět: |
Absolute magnitude
Physics education.field_of_study Population DEEP2 Redshift Survey Astronomy and Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics Redshift survey Galaxy Redshift Extended Groth Strip Space and Planetary Science Astrophysics::Solar and Stellar Astrophysics education Astrophysics::Galaxy Astrophysics Luminosity function (astronomy) |
| Zdroj: | The Astrophysical Journal. 647:853-873 |
| ISSN: | 1538-4357 0004-637X |
| Popis: | The evolution of the B-band galaxy luminosity function is measured using a sample of more than 11,000 galaxies with spectroscopic redshifts from the DEEP2 Redshift Survey. The rest-frame M_B versus U-B color-magnitude diagram of DEEP2 galaxies shows that the color-magnitude bi-modality seen in galaxies locally is still present at redshifts z > 1. Dividing the sample at the trough of this color bimodality into predominantly red and blue galaxies, we find that the luminosity function of each galaxy color type evolves differently. Blue counts tend to shift to brighter magnitudes at constant number density, while the red counts remain largely constant at a fixed absolute magnitude. Using Schechter functions with fixed faint-end slopes we find that M*_B for blue galaxies brightens by ~ 1.3 magnitudes per unit redshift, with no significant evolution in number density. For red galaxies M*_B brightens somewhat less with redshift, while the formal value of phi* declines. When the population of blue galaxies is subdivided into two halves using the rest-frame color as the criterion, the measured evolution of both blue subpopulations is very similar. |
| Databáze: | OpenAIRE |
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