Title: UV bright red-sequence galaxies: how do UV upturn systems evolve in redshift and stellar mass?

Abstract

ABSTRACT 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 Å 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) × (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 inmore » 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.« less

Authors:

Dantas, M. L. L.  ^[1];

• Search DOE PAGES for author "Dantas, M. L. L."
• Search DOE PAGES for ORCID "0000-0002-1178-8169"
• Search orcid.org for ORCID "0000-0002-1178-8169"

Coelho, P. R. T.  ^[2];

• Search DOE PAGES for author "Coelho, P. R. T."
• Search DOE PAGES for ORCID "0000-0003-1846-4826"
• Search orcid.org for ORCID "0000-0003-1846-4826"

de Souza, R. S. ^[3]; Gonçalves, T. S. ^[4]

---

+ Show Author Affiliations

1. Instituto de Astronomia, Geofísica e Ciências Atmosféricas, Universidade de São Paulo, R. do Matão 1226, 05508-090, São Paulo, Brazil, Departamento de Física Teórica, Universidad Autónoma de Madrid, E-28049, Madrid, Spain
2. Instituto de Astronomia, Geofísica e Ciências Atmosféricas, Universidade de São Paulo, R. do Matão 1226, 05508-090, São Paulo, Brazil
3. Department of Physics & Astronomy, University of North Carolina at Chapel Hill, NC 27599, USA
4. Observatório do Valongo, Universidade Federal of Rio de Janeiro, Ladeira Pedro Antônio 43, Rio de Janeiro, RJ 20080-090, Brazil

Publication Date:

2019-12-24

Sponsoring Org.:

USDOE

OSTI Identifier:

1592787

Grant/Contract Number:  

FG02-97ER41041; FG02-97ER41033

Resource Type:

Published Article

Journal Name:

Monthly Notices of the Royal Astronomical Society

Additional Journal Information:

Journal Name: Monthly Notices of the Royal Astronomical Society Journal Volume: 492 Journal Issue: 2; Journal ID: ISSN 0035-8711

Publisher:

Oxford University Press

Country of Publication:

United Kingdom

Language:

English