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 prominent outer ring in ultraviolet (UV) imaging. We analyzed GALEX far- (FUV) and near- (NUV) UV and optical data using stellar population models and estimated the age and the stellar mass of the entire galaxies and of the UV-bright ring structures. Outer rings consist of young (<200 Myr old) stellar populations, accounting for up to 70% of the FUV flux but containing only a few % 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 to the outer rings. At the same time, HI observations of NGC 1533 and NGC 2962 suggest external gas re-fueling can play a role in the rejuvenation processes of such galaxies.

23 pages, 5 figures and 2 tables, Accepted for publication in The Astrophysical Journal

References in corpus (7)

• UV Star Formation Rates in the Local Universe
• A Search for Extended Ultraviolet Disk (XUV-disk) Galaxies in the Local Universe
• The population of barred galaxies in the local universe I. Detection and characterisation of bars
• GALEX UV Color Relations for Nearby Early-Type Galaxies
• The GALEX UV emission in shell galaxies: tracing galaxy "rejuvenation" episodes
• Star formation and figure rotation in the early-type galaxy NGC2974
• The Recent Star Formation in NGC 6822: an Ultraviolet Study

Cited by in corpus (32)

• A Link Between Star Formation Quenching and Inner Stellar Mass Density in SDSS Central Galaxies
• Na-O anticorrelation and HB. IX. Kinematics of the program clusters. A link between systemic rotation and HB morphology?
• Hiding in plain sight: An abundance of compact massive spheroids in the local Universe
• The Galaxy Evolution Explorer (GALEX). Its legacy of UV surveys, and science highlights
• The Slow Death (or Rebirth?) of Extended Star Formation in z~0.1 Green Valley Early-Type Galaxies
• Connecting Transitions in Galaxy Properties to Refueling
• Building gas rings and rejuvenating S0 galaxies through minor mergers
• The gas kinematics, excitation, and chemistry, in connection with star formation, in lenticular galaxies
• The ($NUV-r$) vs. $M_r$ as a tracer of early-type galaxies evolution in USGC U376 and LGG 225 groups
• Fate of stellar bars in minor merger of galaxies
• Formation of S0s via disc accretion around high-redshift compact ellipticals
• Catching Spiral - S0 transition in groups. Insights from SPH simulations with chemo-photometric implementation
• Structural analysis of star-forming blue early-type galaxies: Merger-driven star formation in elliptical galaxies
• VEGAS: a VST Early-type GAlaxy Survey. IV. NGC 1533, IC 2038 and IC 2039: an interacting triplet in the Dorado group
• Green galaxies in the COSMOS field
• Clues on the rejuvenation of the S0 galaxy NGC 404 from the chemical abundance of its outer disk
• The intrinsic shape of bulges in the CALIFA survey
• Galaxy evolution in nearby groups. II. Galaxy evolution in nearby loose groups. II. Photometric and kinematic characterization of USGC U268 and USGC U376 group members in the Leo cloud
• Investigating early-type galaxy evolution with a multiwavelength approach. II. The UV structure of 11 galaxies with Swift-UVOT
• Star-forming rings in lenticular galaxies: origin of the gas
• A minor merger scenario for the ultraluminous X-ray source ESO 243-49 HLX-1 - II. Constraints from photometry
• Morphology and surface photometry of a sample of isolated early-type galaxies from deep imaging
• The redshift evolution of the S0 fraction for $z<1$ in COSMOS
• Cool Dust in the Outer Ring of NGC 1291
• Bar rejuvenation in S0 galaxies?
• Investigating early-type galaxy evolution with a multi-wavelength approach. III. Insights from SPH simulations with chemo-photometric implementation
• The UV window on counter rotating ETGs: insight from SPH simulations with chemo-photometric implementation
• Dorado and its member galaxies. Ha imaging of the group backbone
• A multi-wavelength study of the evolution of Early-Type Galaxies in Groups: the ultraviolet view
• The Star Formation Reference Survey. IV. Stellar mass distribution of local star-forming galaxies
• Galaxy evolution in groups. USGC U268 and USGC U376 in the Leo cloud
• Dorado and its member galaxies II. A UVIT picture of the NGC 1533 substructure