Impact of Galaxy Mergers on Stellar Population Profiles of Early-type Galaxies

We study the impact of galaxy mergers on stellar population profiles/gradients of early-type galaxies (ETGs) using ETGs at z < 0.055 in the Stripe 82 region of the Sloan Digital Sky Survey and MaNGA integral field unit spectroscopic data. Tidal features around ETGs, which are detected from deep c...

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Bibliographic Details
Published in:The Astrophysical journal 2023-03, Vol.946 (1), p.41
Main Authors: Yoon, Yongmin, Ko, Jongwan, Kim, Jae-Woo
Format: Article
Language:English
Subjects:
Astrophysics
Early-type galaxies
Galaxies
Galaxy ages
Galaxy evolution
Galaxy mergers
Galaxy mergers & collisions
Galaxy stellar content
Metallicity
Sky surveys (astronomy)
Star & galaxy formation
Star formation
Stars & galaxies
Stellar populations
Tidal effects
Tidal tails
Universe
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Summary:We study the impact of galaxy mergers on stellar population profiles/gradients of early-type galaxies (ETGs) using ETGs at z < 0.055 in the Stripe 82 region of the Sloan Digital Sky Survey and MaNGA integral field unit spectroscopic data. Tidal features around ETGs, which are detected from deep coadded images, are regarded as direct observational evidence for recent mergers. We find that ETGs with tidal features have less negative metallicity gradients and more positive age gradients than ETGs without tidal features at M star ≳ 10 10.6 M ⊙ . Moreover, when integrating all the resolved stellar populations, ETGs with tidal features have lower metallicities by ∼0.07 dex and younger ages by ∼1–2 Gyr than ETGs without tidal features. Analyzing star formation histories, we discover that the mass fraction of young stellar populations with age
ISSN:0004-637X
1538-4357
DOI:10.3847/1538-4357/acbcc5