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Title: Bar rejuvenation in S0 galaxies?

Journal Article · · Monthly Notices of the Royal Astronomical Society
ORCiD logo [1];  [2]
  1. Indian Institute of Astrophysics (IIA), II Block, Koramangala, Bengaluru 560 034, India
  2. Inter-University Centre for Astronomy and Astrophysics (IUCAA), Post Bag 4, Ganeshkhind, Pune 411007, India

ABSTRACT Based on the colour measurements from a multiband, multicomponent 2D decompositions of S0 and spiral galaxies using SDSS images, we found that bars are bluer in S0 galaxies compared to the spiral galaxies. Most of the S0s in our sample have stellar masses ∼L* galaxies. The environment might have played an important role as most of the S0s with bluer bars are in the intermediate-density environment. The possibility of minor mergers and tidal interactions that occurs frequently in the intermediate-density environment might have caused either a bar to form and/or induce star formation in the barred region of S0 galaxies. The underlying discs show the usual behaviour being redder in S0s compared to spiral galaxies while the bulges are red and old for both S0 and spiral galaxies. The finding of bluer bars in S0 galaxies is a puzzling issue and poses an interesting question at numerical and theoretical studies most of which shows that the bars are long-lived structures with old stellar populations.

Sponsoring Organization:
USDOE
OSTI ID:
1633115
Journal Information:
Monthly Notices of the Royal Astronomical Society, Journal Name: Monthly Notices of the Royal Astronomical Society Journal Issue: 4 Vol. 495; ISSN 0035-8711
Publisher:
Oxford University PressCopyright Statement
Country of Publication:
United Kingdom
Language:
English

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  • Fraser-McKelvie, Amelia; Merrifield, Michael; Aragón-Salamanca, Alfonso
  • Monthly Notices of the Royal Astronomical Society: Letters, Vol. 488, Issue 1 https://doi.org/10.1093/mnrasl/slz085
journal June 2019
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