Bending Waves in Velocity Space: a First Look at the THINGS sample
arXiv:2202.07418 · doi:10.1093/mnras/stac1048
Abstract
Detection of bending waves is a highly challenging task even in nearby disc galaxies due to their sub-kpc bending amplitudes. However, simulations show that the harmonic bending of a Milky Way like disc galaxy is associated with a harmonic fluctuation in the measured line of sight (los) velocities as well, and can be regarded as a kinematic signature of a manifested bending wave. Here, we look for similar kinematic signatures of bending waves in \HI discs, as they extend to much beyond the optical radii. We present a multipole analysis of the \HI los residual velocity fields of six nearby spiral galaxies from the THINGS sample, which uncovers the bending wave-induced velocity peaks. This allows us to identify the radial positions and amplitudes of the different bending modes present in the galaxies. We find that all of our sample discs show a combined kinematic signature of superposition of a few lower-order bending modes, suggesting that bending waves are a common phenomenon. The identified velocity peaks are found to be of modes and , not more than 15 km s in amplitude and spread across the entire \HI disc. Interestingly, they appear to be concentrated near the optical edge of their host galaxies. Also, appears to be more common than the other two modes.
arXiv commentAccepted in MNRAS, 12 pages, 11 figures
References in corpus (61)
- Final Results from the Hubble Space Telescope Key Project to Measure the Hubble Constant
- THINGS: The HI Nearby Galaxy Survey
- High-Resolution Rotation Curves and Galaxy Mass Models from THINGS
- A dynamically young and perturbed Milky Way disk
- Vertical waves in the solar neighbourhood in Gaia DR2
- What is Driving the HI Velocity Dispersion?
- Galactoseismology: Discovery of Vertical Waves in the Galactic Disk
- Footprints of the Sagittarius dwarf galaxy in the data set
- The wobbly Galaxy: kinematics north and south with RAVE red clump giants
- Measuring non-axisymmetry in spiral galaxies
- Rings and Radial Waves in the Disk of the Milky Way
- The Influence of Sagittarius and the Large Magellanic Cloud on the Milky Way Galaxy
- Vertical density waves in the Milky Way disc induced by the Sagittarius Dwarf Galaxy
- The Vertical Structure of the Outer Milky Way HI Disk
- The GALAH survey and Gaia DR2: dissecting the stellar disc's phase space by age, action, chemistry and location
- Modeling Non-Circular Motions in Disk Galaxies: Application to NGC 2976
- A Galactic-scale gas wave in the Solar Neighborhood
- Dynamical Centers and Non-Circular Motions in THINGS Galaxies: Implications for Dark Matter Halos
- Response of the Milky Way's disc to the Large Magellanic Cloud in a first infall scenario
- Bending and Breathing Modes of the Galactic Disk
- The origin of the Gaia phase-plane spiral
- Substructure in bulk velocities of Milky Way disk stars
- Warp, Waves, and Wrinkles in the Milky Way
- Warps and Cosmic Infall
- The echo of the bar buckling: phase-space spirals in Gaia DR2
- A Magellanic Origin for the Warp of the Galaxy
- Galactic seismology: the evolving "phase spiral" after the Sagittarius dwarf impact
- Warps and waves in the stellar discs of the Auriga cosmological simulations
- NGC 4244: A Low Mass Galaxy with a Falling Rotation Curve and a Flaring Gas Layer
- A re-interpretation of the Triangulum-Andromeda stellar clouds: a population of halo stars kicked out of the Galactic disk
- The Stellar Number Density Distribution in the Local Solar Neighborhood is North-South Asymmetric
- A fully cosmological model of a Monoceros-like ring
- Excitation of coupled stellar motions in the Galactic Disk by orbiting satellites
- The Damping and Excitation of Galactic Warps by Dynamical Friction
- Generation of galactic disc warps due to intergalactic accretion flows onto the disc
- Signatures of minor mergers in the Milky Way disc I: The SEGUE stellar sample
- The Complex Structure of Stars in the Outer Galactic Disk as revealed by Pan-STARRS1
- Radial gas motions in The HI Nearby Galaxy Survey (THINGS)
- Bending Waves in the Milky Way's disc from halo substructure
- The Flattened Dark Matter Halo of M31 as Deduced from the Observed HI Scale Heights
- Kinematics with Gaia DR2: The Force of a Dwarf
- Bending instabilities at the origin of persistent warps: a new constraint on dark matter halos
- Exploring the Galactic Warp Through Asymmetries in the Kinematics of the Galactic Disk
- Properties of tidally-triggered vertical disk perturbations
- 3D Asymmetrical motions of the Galactic outer disk with LAMOST K giant stars
- Mapping the Monoceros Ring in 3D with Pan-STARRS1
- Mapping the Galactic disk with the LAMOST and Gaia Red clump sample. II. 3D asymmetrical kinematics of mono-age populations in the disk between 6 \,kpc
- Spontaneous generation of bending waves in isolated Milky Way-like discs
- Axisymmetric bending oscillations of stellar disks
- Gaia-DR2 extended kinematical maps. Part II: Dynamics in the Galactic disk explaining radial and vertical velocities
- Probing interstellar turbulence in spiral galaxies using HI power spectrum analysis
- Wobbly discs -- corrugations seen in the dust lanes of edge-on galaxies
- Detection of a Corrugated Velocity Pattern in the Spiral Galaxy NGC 5427
- Eigenfunctions of Galactic Phase Space Spirals from Dynamic Mode Decomposition
- Self-consistent response of a galactic disc to vertical perturbations
- Evidence of large scale energy cascade in the spiral galaxy NGC 5236
- The flaring HI disk of the nearby spiral galaxy NGC 2683
- A Holistic Review of a Galactic Interaction
- Corrugated velocity patterns in the spiral galaxies: NGC 278, NGC 1058, NGC 2500 \& UGC 3574
- A search for non-circular flows in the extended HI disc of NGC 2915
- Circumgalactic gas at its extreme: tidal gas streams around the Whale galaxy NGC 4631 explored with HST/COS