Gas engaged in noncircular motions in LITTLE THINGS dwarf irregular galaxies
arXiv:1905.06915 · doi:10.3847/1538-3881/ab223d
Abstract
We have examined gas engaged in noncircular motions in 22 of the nearby LITTLE THINGS dwarf irregular galaxies. The HI data cubes have been deconvolved into kinematic components - bulk rotation and noncircular motions, to produce maps of integrated gas, velocity field, and velocity dispersion in the different components. We found significant regions of gas engaged in noncircular motions in half of the galaxies, involving 1%-20% of the total HI mass of the galaxy. In one galaxy we found a pattern in the velocity field that is characteristic of streaming motions around the stellar bar potential and star formation at the end of bar. Two galaxies have large-scale filamentary structures found in their outer disks, and these filaments could be transient instabilities in the gas. We found no spatial correlation between noncircular motion gas and enhanced star formation. We found noncircular motion gas in only one galaxy associated with higher HI velocity dispersion.
In press in AJ
References in corpus (9)
- The Origin of the Galaxy Mass-Metallicity Relation and Implications for Galactic Outflows
- High-resolution mass models of dwarf galaxies from LITTLE THINGS
- High-resolution dark matter density profiles of THINGS dwarf galaxies: Correcting for non-circular motions
- Star formation sustained by gas accretion
- Highly efficient star formation in NGC 5253 possibly from stream-fed accretion
- A Star Formation Law for Dwarf Irregular Galaxies
- The HI Chronicles of LITTLE THINGS BCDs II: The Origin of IC 10's HI Structure
- Fornax globular cluster distributions: implications for the cusp-core problem
- The HI Chronicles of LITTLE THINGS BCDS III: Gas Clouds in and around Mrk 178, VII Zw 403, AND NGC 3738
Cited by in corpus (4)
- Gas dynamics in dwarf galaxies as testbeds for dark matter and galaxy evolution
- Star formation in the nearby dwarf galaxy DDO 53: interplay between gas accretion and stellar feedback
- Relationships between the Stellar, Gaseous, and Star Formation Disks in LITTLE THINGS Dwarf Irregular Galaxies: Indirect Evidence for Substantial Fractions of Dark Molecular Gas
- Dwarf galaxies with central cores in modified Newtonian dynamics (MOND) gravity