| Name: | Saili Keshri |
| Affiliation: | Indian Institute of Astrophysics |
| Conference ID: | ASI2025_340 |
| Title: | Kinematic Misalignments and Remnant Features in Early-Type Galaxies: Insights from SDSS-MaNGA Data |
| Authors: | Saili Keshri 1,2, Sudhanshu Barway 1, Gourab Giri 3,4, Somak Raychaushury 5,6
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| Authors Affiliation: | 1 Indian Institute of Astrophysics, Kormangala II Block, Bengaluru, India, 560034
2 Department of Physics, Pondicherry University, R.V.Nagar, Kalapet, Puducherry, India, 605014
3 Department of Physics, University of Pretoria, Private Bag X20, Hatfield 0028, South Africa
4 South African Radio Astronomy Observatory, 2 Fir St, Black River Park, Observatory 7925, South Africa
5 Department of Physics, Ashoka University, Sonipat, Haryana, 131029, India
6 School of Physics and Astronomy, University of Birmingham, Birmingham B15 2TT, UK |
| Mode of Presentation: | Oral |
| Abstract Category: | Galaxies and Cosmology |
| Abstract: | We present an analysis of 53 early-type galaxies (ETGs) using SDSS-MaNGA IFU data to investigate their stellar and gas kinematics, focusing on kinematic misalignments as indicators of merger activity. We examine the occurrence of these kinematic features across diverse environments and their position on the specific star formation rate (sSFR)–stellar mass plane. Most ETGs are found in intermediate-density environments, with smaller fractions in high- and low-density environments, suggesting a unique presence of ETGs in intermediate densities given ETGs' typical association with high-density environments. Kinematic analysis reveals that most ETGs show significant stellar-gas misalignment with higher misalignment rates in intermediate-density environments, likely due to favorable conditions for gas accretion. ETGs are distributed across the sSFR–mass plane, with the majority being quenched, while comparable fractions occupy the star-forming and green valley regions. Misaligned ETGs predominantly populate the quenched region, though some star-forming cases suggest recent merger events. Additionally, most ETGs in our sample display shell structures, and the majority of shell galaxies are kinematically misaligned. These shells, alongside other remnant features, are primarily found in intermediate-density environments, underscoring the significant role of both intermediate- and high-density environments in shaping ETG evolutionary pathways.
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