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Title: TRACING REJUVENATION EVENTS IN NEARBY S0 GALAXIES

Abstract

With the aim of characterizing rejuvenation processes in early-type galaxies, we analyzed five barred S0 galaxies showing a prominent outer ring in ultraviolet (UV) imaging. We analyzed Galaxy Evolution Explorer far-UV (FUV) and near-UV (NUV), and optical data using stellar population models and estimated the age and the stellar mass of the entire galaxies and the UV-bright ring structures. Outer rings consist of young ({approx}<200 Myr old) stellar populations, accounting for up to 70% of the FUV flux but containing only a few percent of the total stellar mass. Integrated photometry of the whole galaxies places four of these objects on the green valley, indicating a globally evolving nature. We suggest such galaxy evolution is likely driven by bar-induced instabilities, i.e., inner secular evolution, that conveys gas to the nucleus and the outer rings. At the same time, H I observations of NGC 1533 and NGC 2962 suggest external gas re-fueling can play a role in the rejuvenation processes of such galaxies.

Authors:
; ;  [1]; ; ; ;  [2]
  1. Department of Physics and Astronomy, Johns Hopkins University, 3400 N. Charles St., Baltimore, MD 21218 (United States)
  2. INAF Osservatorio Astronomico di Padova, Vicolo dell'Osservatorio 5, I-35122 Padova (Italy)
Publication Date:
OSTI Identifier:
21578223
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal
Additional Journal Information:
Journal Volume: 736; Journal Issue: 2; Other Information: DOI: 10.1088/0004-637X/736/2/154; Journal ID: ISSN 0004-637X
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; GALACTIC EVOLUTION; GALAXIES; MASS; PHOTOMETRY; ULTRAVIOLET RADIATION; ELECTROMAGNETIC RADIATION; EVOLUTION; RADIATIONS

Citation Formats

Marino, Antonietta, Bianchi, Luciana, Thilker, David A., Rampazzo, Roberto, Annibali, Francesca, Bressan, Alessandro, and Buson, Lucio Maria, E-mail: amarino@pha.jhu.edu. TRACING REJUVENATION EVENTS IN NEARBY S0 GALAXIES. United States: N. p., 2011. Web. doi:10.1088/0004-637X/736/2/154.
Marino, Antonietta, Bianchi, Luciana, Thilker, David A., Rampazzo, Roberto, Annibali, Francesca, Bressan, Alessandro, & Buson, Lucio Maria, E-mail: amarino@pha.jhu.edu. TRACING REJUVENATION EVENTS IN NEARBY S0 GALAXIES. United States. doi:10.1088/0004-637X/736/2/154.
Marino, Antonietta, Bianchi, Luciana, Thilker, David A., Rampazzo, Roberto, Annibali, Francesca, Bressan, Alessandro, and Buson, Lucio Maria, E-mail: amarino@pha.jhu.edu. Mon . "TRACING REJUVENATION EVENTS IN NEARBY S0 GALAXIES". United States. doi:10.1088/0004-637X/736/2/154.
@article{osti_21578223,
title = {TRACING REJUVENATION EVENTS IN NEARBY S0 GALAXIES},
author = {Marino, Antonietta and Bianchi, Luciana and Thilker, David A. and Rampazzo, Roberto and Annibali, Francesca and Bressan, Alessandro and Buson, Lucio Maria, E-mail: amarino@pha.jhu.edu},
abstractNote = {With the aim of characterizing rejuvenation processes in early-type galaxies, we analyzed five barred S0 galaxies showing a prominent outer ring in ultraviolet (UV) imaging. We analyzed Galaxy Evolution Explorer far-UV (FUV) and near-UV (NUV), and optical data using stellar population models and estimated the age and the stellar mass of the entire galaxies and the UV-bright ring structures. Outer rings consist of young ({approx}<200 Myr old) stellar populations, accounting for up to 70% of the FUV flux but containing only a few percent of the total stellar mass. Integrated photometry of the whole galaxies places four of these objects on the green valley, indicating a globally evolving nature. We suggest such galaxy evolution is likely driven by bar-induced instabilities, i.e., inner secular evolution, that conveys gas to the nucleus and the outer rings. At the same time, H I observations of NGC 1533 and NGC 2962 suggest external gas re-fueling can play a role in the rejuvenation processes of such galaxies.},
doi = {10.1088/0004-637X/736/2/154},
journal = {Astrophysical Journal},
issn = {0004-637X},
number = 2,
volume = 736,
place = {United States},
year = {2011},
month = {8}
}