The nature of extremely red galaxies in the local universe
Contribuinte(s) |
UNIVERSIDADE DE SÃO PAULO |
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Data(s) |
12/12/2013
12/12/2013
2013
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Resumo |
We investigate the nature of extremely red galaxies (ERGs), objects whose colours are redder than those found in the red sequence present in colour–magnitude diagrams of galaxies. We selected from the Sloan Digital Sky Survey Data Release 7 a volume-limited sample of such galaxies in the redshift interval 0.010 < z < 0.030, brighter than Mr = −17.8 (magnitudes dereddened, corrected for the Milky Way extinction) and with (g − r) colours larger than those of galaxies in the red sequence. This sample contains 416 ERGs, which were classified visually. Our classification was cross-checked with other classifications available in the literature. We found from our visual classification that the majority of objects in our sample are edge-on spirals (73 per cent). Other spirals correspond to 13 per cent, whereas elliptical galaxies comprise only 11 per cent of the objects. After comparing the morphological mix and the distributions of Hα/Hβ and axial ratios of ERGs and objects in the red sequence, we suggest that dust, more than stellar population effects, is the driver of the red colours found in these extremely red galaxies. FAPESP CNPq |
Identificador |
Monthly Notices of the Royal Astronomical Society, Oxford, v. 434, p. 2503-2508, 2013 http://www.producao.usp.br/handle/BDPI/43661 10.1093/mnras/stt1188 http://mnras.oxfordjournals.org/content/434/3/2503.full.pdf+html |
Idioma(s) |
eng |
Publicador |
Oxford University Press Oxford |
Relação |
Monthly Notices of the Royal Astronomical Society |
Direitos |
restrictedAccess Copyright 2013 The Authors |
Palavras-Chave | #Galaxies: fundamental parameters #Galaxies: photometry #Galaxies: spiral #GALÁXIAS #GALÁXIAS ESPIRAIS #FOTOMETRIA |
Tipo |
article original article publishedVersion |