| Texto completo | |
| Autor(es): |
Número total de Autores: 4
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| Afiliação do(s) autor(es): | [1] Univ Autonoma Madrid, Dept Fis Teor, E-28049 Madrid - Spain
[2] Univ Sao Paulo, Inst Astron Geofis & Ciencias Atmosfer, R Matao 1226, BR-05508090 Sao Paulo - Brazil
[3] Univ N Carolina, Dept Phys & Astron, Chapel Hill, NC 27599 - USA
[4] Univ Fed Rio de Janeiro, Observ Valongo, Ladeira Pedro Antonio 43, BR-20080090 Rio De Janeiro, RJ - Brazil
Número total de Afiliações: 4
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| Tipo de documento: | Artigo Científico |
| Fonte: | Monthly Notices of the Royal Astronomical Society; v. 492, n. 2, p. 2996-3011, FEB 2020. |
| Citações Web of Science: | 0 |
| Resumo | |
The so-called ultraviolet (UV) upturn of elliptical galaxies is a phenomenon characterized by the up-rise of their fluxes in bluer wavelengths, typically in the 1200-2500 angstrom range. This work aims at estimating the rate of occurrence of the UV upturn over the entire red-sequence population of galaxies that show significant UV emission. This assessment is made considering it as function of three parameters: redshift, stellar mass, and - what may seem counter-intuitive at first - emission-line classification. We built a multiwavelength spectrophotometric catalogue from the Galaxy Mass Assembly survey, together with aperture-matched data from Galaxy Evolution Explorer Medium-Depth Imaging Survey (MIS) and Sloan Digital Sky Survey, covering the redshift range between 0.06 and 0.40. From this sample, we analyse the UV emission among UV bright galaxies, by selecting those that occupy the red-sequence locus in the (NUV - r) x (FUV - NUV) chart; then, we stratify the sample by their emission-line classes. To that end, we make use of emission-line diagnostic diagrams, focusing the analysis in retired/passive lineless galaxies. Then, a Bayesian logistic model was built to simultaneously deal with the effects of all galaxy properties (including emission-line classification or lack thereof). The main results show that retired/passive systems host an up-rise in the fraction of UV upturn for redshifts between 0.06 and 0.25, followed by an in-fall up to 0.35. Additionally, we show that the fraction of UV upturn hosts rises with increasing stellar mass. (AU) | |
| Processo FAPESP: | 18/05392-8 - Uma nova biblioteca de modelos de população estelar puramente teóricos |
| Beneficiário: | Paula Rodrigues Teixeira Coelho |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |