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Warped Disk Galaxies. I. Linking U type Warps in Groups/Clusters to Jellyfish Galaxies
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2022.08.17
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Warped Disk Galaxies. I. Linking U type Warps in Groups/Clusters to Jellyfish Galaxies


Woong-Bae G. Zee, Suk-Jin Yoon, Jun-Sung Moon, Sung-Ho An, Sanjaya Paudel, Kiyun Yun


Warped disk galaxies are classified into two morphologies: S- and U-types. Conventional theories routinely attribute both types to galactic tidal interaction and/or gas accretion, but reproducing of U-types in simulations is extremely challenging. Here we investigate whether both types are governed by the same mechanisms using the most extensive sample of 8000 nearby (0.02\,<\,z\,<\,0.06) massive (M/M\,>\,109) edge-on disks from SDSS. We find that U-types show on average bluer optical colors and higher specific star formation rate (sSFR) than S-types, with more strongly warped U-types having higher sSFR. We also find that while the S-type warp properties correlate with the tidal force by the nearest neighbor regardless of the environment, there is no such correlation for U-types in groups/clusters, suggesting a non-tidal environmental could be at play for U-types, such as ram pressure stripping (RPS). Indeed, U-types are more common in groups/clusters than in fields and they have stellar mass, gas fraction, sSFR enhancement and phase-space distribution closely analogous to RPS-induced jellyfish galaxies in clusters. We furthermore show that the stellar disks of most RPS galaxies in the IllustirsTNG simulation are warped in U-shape and bent in opposite direction of stripped gas tails, satisfying theoretical expectations for stellar warps embeded in jellyfishes. We therefore suggest that despite the majority of U-types that live in fields being still less explained, RPS can be an alternative origin for those in groups/clusters.


https://arxiv.org/abs/2208.05534

저자명
Woong-Bae G. Zee, Suk-Jin Yoon, Jun-Sung Moon, Sung-Ho An, Sanjaya Paudel