HI mapping of the Leo Triplet: Morphologies and kinematics of tails and bridges
arXiv:2110.13015 · doi:10.1051/0004-6361/202141565
Abstract
A fully-sampled and hitherto highest resolution and sensitivity observation of neutral hydrogen (HI) in the Leo Triplet (NGC 3628, M 65/NGC 3623, and M 66/NGC 3627) reveals six HI structures beyond the three galaxies. We present detailed results of the morphologies and kinematics of these structures, which can be used for future simulations. In particular, we detect a two-arm structure in the plume of NGC 3628 for the first time, which can be explained by a tidal interaction model. The optical counterpart of the plume is mainly associated with the southern arm. The connecting part (base) of the plume (directed eastwards) with NGC 3628 is located at the blueshifted (western) side of NGC 3628. Two bases appear to be associated with the two arms of the plume. A clump with reversed velocity gradient (relative to the velocity gradient of M 66) and a newly detected tail, i.e. M 66SE, is found in the southeast of M 66. We suspect that M 66SE represents gas from NGC 3628 which was captured by M 66 in the recent interaction between the two galaxies. Meanwhile gas is falling toward M 66, resulting in features already previously observed in the southeastern part of M 66, e.g. large line widths and double peaks. An upside-down `Y'-shaped HI gas component (M 65S) is detected in the south of M 65 which suggests that M 65 may also have been involved in the interaction. We strongly encourage modern hydrodynamical simulations of this interacting group of galaxies to reveal the origin of the gaseous debris surrounding all three galaxies.
arXiv comment21 pages, 12 figures, accepted for publication in A&A
References in corpus (24)
- Hierarchical Galaxy Formation
- A 2MASS All-Sky View of the Sagittarius Dwarf Galaxy: I. Morphology of the Sagittarius Core and Tidal Arms
- The Arecibo Legacy Fast ALFA Survey: The alpha.40 HI Source Catalog, its Characteristics and their Impact on the Derivation of the HI Mass Function
- A giant stream of metal-rich stars in the halo of the galaxy M31
- Structural Analysis of Molecular Clouds: Dendrograms
- Stellar Tidal Streams in Spiral Galaxies of the Local Volume: A Pilot Survey with Modest Aperture Telescopes
- The Extragalactic Distance Database: Color-Magnitude Diagrams
- Distances to PHANGS Galaxies: New Tip of the Red Giant Branch Measurements and Adopted Distances
- Galaxies as simple dynamical systems: observational data disfavor dark matter and stochastic star formation
- Micro-Arcsecond Radio Astrometry
- Do dwarf galaxies form in tidal tails?
- Making Counter-Orbiting Tidal Debris: The Origin of the Milky Way Disc of Satellites
- The Arecibo Legacy Fast ALFA Survey: IX. The Leo Region HI Catalog, Group Membership and the HI Mass Function for the Leo I Group
- Star formation triggered by galaxy interactions in modified gravity
- Discovery of a stellar tidal stream around the Whale galaxy, NGC 4631
- Advanced Camera for Surveys Observations of Young Star Clusters in the Interacting Galaxy UGC 10214
- Unusual magnetic fields in the interacting spiral NGC 3627
- Halpha3: Halpha imaging survey of HI selected galaxies from ALFALFA
- Large Velocity Gradients in the Tidal Tails of the Interacting Galaxy AM 1353-272 ("The Dentist's Chair")
- NGC 3628-UCD1: A possible Cen Analog Embedded in a Stellar Stream
- The Leo Triplet: Common origin or late encounter?
- NGC 3627: a galaxy-dwarf collision?
- A new formation model for omega Centauri: the crossroad of astrophysical processes
- Discovery of a tidal dwarf galaxy in the Leo Triplet