Shell-type Tidal Features Are More Frequently Detected in Slowly Rotating Early-type Galaxies than Stream- and Tail-type Features
To enhance our understanding of the impact of galaxy mergers on the kinematics of early-type galaxies (ETGs), we examine differences in specific stellar angular momentum within the half-light radius ( ${\lambda }_{{R}_{e}}$ ) among ETGs with different types of tidal features and those without such f...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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IOP Publishing
2024-01-01
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| Series: | The Astrophysical Journal |
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| Online Access: | https://doi.org/10.3847/1538-4357/ad34ad |
| _version_ | 1797202792698347520 |
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| author | Yongmin Yoon Jongwan Ko Haeun Chung Woowon Byun Kyungwon Chun |
| author_facet | Yongmin Yoon Jongwan Ko Haeun Chung Woowon Byun Kyungwon Chun |
| author_sort | Yongmin Yoon |
| collection | DOAJ |
| description | To enhance our understanding of the impact of galaxy mergers on the kinematics of early-type galaxies (ETGs), we examine differences in specific stellar angular momentum within the half-light radius ( ${\lambda }_{{R}_{e}}$ ) among ETGs with different types of tidal features and those without such features. This is accomplished by categorizing tidal features, which serve as direct evidence of recent mergers, into shells, streams, and tails, through deep images from the DESI Legacy Survey, and by using MaNGA data for the analysis of the kinematics of 1244 ETGs at z < 0.055. We find that ETGs with tidal features typically have reduced ${\lambda }_{{R}_{e}}$ values that are lower by 0.12 dex than ETGs without tidal features. ETGs with shells contribute most to the reduction in ${\lambda }_{{R}_{e}}$ . Consequently, nearly half of ETGs with shells are classified as slow rotators, a fraction that is more than twice as high as that of ETGs with tails or streams, and over three times higher than that of ETGs without tidal features. These trends generally remain valid even when ETGs are divided into several mass bins. Our findings support the idea that radial mergers, which are more effective at reducing ${\lambda }_{{R}_{e}}$ than circular mergers, are more closely associated with the formation of shells rather than streams or tails. The detection of shells in slightly more massive ETGs compared to streams and tails may be attributed to the fact that massive satellite galaxies are more likely to be accreted through radial orbits, due to the nature of dynamical friction. |
| first_indexed | 2024-04-24T08:09:04Z |
| format | Article |
| id | doaj.art-285417749e0e4929ac5c8717a2df3dae |
| institution | Directory Open Access Journal |
| issn | 1538-4357 |
| language | English |
| last_indexed | 2024-04-24T08:09:04Z |
| publishDate | 2024-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Astrophysical Journal |
| spelling | doaj.art-285417749e0e4929ac5c8717a2df3dae2024-04-17T08:21:15ZengIOP PublishingThe Astrophysical Journal1538-43572024-01-01965215810.3847/1538-4357/ad34adShell-type Tidal Features Are More Frequently Detected in Slowly Rotating Early-type Galaxies than Stream- and Tail-type FeaturesYongmin Yoon0https://orcid.org/0000-0003-0134-8968Jongwan Ko1https://orcid.org/0000-0002-9434-5936Haeun Chung2https://orcid.org/0000-0002-3043-2555Woowon Byun3https://orcid.org/0000-0002-7762-7712Kyungwon Chun4https://orcid.org/0000-0001-9544-7021Korea Astronomy and Space Science Institute (KASI) , 776 Daedeokdae-ro, Yuseong-gu, Daejeon 34055, Republic of Korea ; yyoon@kasi.re.krKorea Astronomy and Space Science Institute (KASI) , 776 Daedeokdae-ro, Yuseong-gu, Daejeon 34055, Republic of Korea ; yyoon@kasi.re.kr; University of Science and Technology , Gajeong-ro, Daejeon 34113, Republic of KoreaUniversity of Arizona , Steward Observatory, 933 N Cherry Avenue, Tucson, AZ 85721 USAKorea Astronomy and Space Science Institute (KASI) , 776 Daedeokdae-ro, Yuseong-gu, Daejeon 34055, Republic of Korea ; yyoon@kasi.re.krKorea Astronomy and Space Science Institute (KASI) , 776 Daedeokdae-ro, Yuseong-gu, Daejeon 34055, Republic of Korea ; yyoon@kasi.re.krTo enhance our understanding of the impact of galaxy mergers on the kinematics of early-type galaxies (ETGs), we examine differences in specific stellar angular momentum within the half-light radius ( ${\lambda }_{{R}_{e}}$ ) among ETGs with different types of tidal features and those without such features. This is accomplished by categorizing tidal features, which serve as direct evidence of recent mergers, into shells, streams, and tails, through deep images from the DESI Legacy Survey, and by using MaNGA data for the analysis of the kinematics of 1244 ETGs at z < 0.055. We find that ETGs with tidal features typically have reduced ${\lambda }_{{R}_{e}}$ values that are lower by 0.12 dex than ETGs without tidal features. ETGs with shells contribute most to the reduction in ${\lambda }_{{R}_{e}}$ . Consequently, nearly half of ETGs with shells are classified as slow rotators, a fraction that is more than twice as high as that of ETGs with tails or streams, and over three times higher than that of ETGs without tidal features. These trends generally remain valid even when ETGs are divided into several mass bins. Our findings support the idea that radial mergers, which are more effective at reducing ${\lambda }_{{R}_{e}}$ than circular mergers, are more closely associated with the formation of shells rather than streams or tails. The detection of shells in slightly more massive ETGs compared to streams and tails may be attributed to the fact that massive satellite galaxies are more likely to be accreted through radial orbits, due to the nature of dynamical friction.https://doi.org/10.3847/1538-4357/ad34adEarly-type galaxiesGalaxy kinematicsGalaxy mergersGalaxy propertiesTidal tailsGalaxy rotation |
| spellingShingle | Yongmin Yoon Jongwan Ko Haeun Chung Woowon Byun Kyungwon Chun Shell-type Tidal Features Are More Frequently Detected in Slowly Rotating Early-type Galaxies than Stream- and Tail-type Features The Astrophysical Journal Early-type galaxies Galaxy kinematics Galaxy mergers Galaxy properties Tidal tails Galaxy rotation |
| title | Shell-type Tidal Features Are More Frequently Detected in Slowly Rotating Early-type Galaxies than Stream- and Tail-type Features |
| title_full | Shell-type Tidal Features Are More Frequently Detected in Slowly Rotating Early-type Galaxies than Stream- and Tail-type Features |
| title_fullStr | Shell-type Tidal Features Are More Frequently Detected in Slowly Rotating Early-type Galaxies than Stream- and Tail-type Features |
| title_full_unstemmed | Shell-type Tidal Features Are More Frequently Detected in Slowly Rotating Early-type Galaxies than Stream- and Tail-type Features |
| title_short | Shell-type Tidal Features Are More Frequently Detected in Slowly Rotating Early-type Galaxies than Stream- and Tail-type Features |
| title_sort | shell type tidal features are more frequently detected in slowly rotating early type galaxies than stream and tail type features |
| topic | Early-type galaxies Galaxy kinematics Galaxy mergers Galaxy properties Tidal tails Galaxy rotation |
| url | https://doi.org/10.3847/1538-4357/ad34ad |
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