Exploring Lenticular Galaxy Formation in Field Environments Using NewHorizon: Evidence for Counterrotating Gas Accretion as a Formation Channel

The formation pathways of lenticular galaxies (S0s) in field environments remain a matter of debate. We utilize the cosmological hydrodynamic simulation, NewHorizon , to investigate the issue. We select two massive star formation quenched S0s as our main sample. By closely tracing their physical and...

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Published in:The Astrophysical journal 2024-12, Vol.977 (1), p.116
Main Authors: Han, Seongbong, Jang, J. K., Contini, Emanuele, Dubois, Yohan, Jeon, Seyoung, Kaviraj, Sugata, Kimm, Taysun, Kraljic, Katarina, Oh, Sree, Peirani, Sébastien, Pichon, Christophe, Yi, Sukyoung K.
Format: Article
Language:English
Subjects:
Accretion
Angular momentum
Channels
Disk galaxies
Environmental effects
Galactic evolution
Galaxies
Galaxy dynamics
Galaxy evolution
Galaxy formation
Galaxy mergers
Galaxy quenching
Kinematics
Massive stars
Morphology
Sciences of the Universe
Star & galaxy formation
Star formation
Stars
Water inflow
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container_issue 1
container_start_page 116
container_title The Astrophysical journal
container_volume 977
creator Han, Seongbong
Jang, J. K.
Contini, Emanuele
Dubois, Yohan
Jeon, Seyoung
Kaviraj, Sugata
Kimm, Taysun
Kraljic, Katarina
Oh, Sree
Peirani, Sébastien
Pichon, Christophe
Yi, Sukyoung K.
description The formation pathways of lenticular galaxies (S0s) in field environments remain a matter of debate. We utilize the cosmological hydrodynamic simulation, NewHorizon , to investigate the issue. We select two massive star formation quenched S0s as our main sample. By closely tracing their physical and morphological evolution, we identify two primary formation channels: mergers and counterrotating gas accretion. The former induces central gas inflow due to gravitational and hydrodynamic torques, triggering active central star formation, which quickly depletes the gas of the galaxy. Counterrotating gas accretion overall has a similar outcome but more exclusively through hydrodynamic collisions between the preexisting and newly accreted gas. Both channels lead to S0 morphology, with gas angular momentum cancellation being a crucial mechanism. These formation pathways quench star formation on a short timescale (
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subjects Accretion
Angular momentum
Channels
Disk galaxies
Environmental effects
Galactic evolution
Galaxies
Galaxy dynamics
Galaxy evolution
Galaxy formation
Galaxy mergers
Galaxy quenching
Kinematics
Massive stars
Morphology
Sciences of the Universe
Star & galaxy formation
Star formation
Stars
Water inflow
title Exploring Lenticular Galaxy Formation in Field Environments Using NewHorizon: Evidence for Counterrotating Gas Accretion as a Formation Channel
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