The Survey of HI in Extremely Low-mass Dwarfs: New Results from VLA Imaging

Authors

Francesco Pecere, Macalester CollegeFollow
John M. Cannon, Macalester CollegeFollow
Damen Beverlin, Macalester CollegeFollow
Jackson CoddFollow

Abstract

We present new HI spectral line imaging of 19 galaxies in the “Survey of HI in Extremely Low-mass Dwarfs” (SHIELD) acquired for Large Program VLA/ 20A-330. Using the National Radio Astronomy Observatory’s Karl G. Jansky Very Large Array (VLA) in the C configuration, we produce images of the neutral interstellar medium (HI) on angular scales of 15 to 20 arcseconds (corresponding to physical resolutions of 200 to 1100 parsecs). The three-dimensional cubes probe the morphology and kinematics of the gas at a range of spatial and spectral resolutions. The cubes were collapsed to produce two-dimensional moment maps (representing HI mass surface density and intensity weighted HI velocity). The HI gas was directly compared to the stellar component by comparison against optical and infrared imaging. In most cases, the gas and stars are co-spatial, with the exception of dwarfs with companion galaxies. The SHIELD galaxies are important to our understanding of galaxies’ properties at the low end of the mass spectrum.

Streaming Media

Recommended Citation

Pecere, Francesco; Cannon, John M.; Beverlin, Damen; and Codd, Jackson (2022) "The Survey of HI in Extremely Low-mass Dwarfs: New Results from VLA Imaging," Macalester Journal of Physics and Astronomy: Vol. 10: Iss. 1, Article 8.
Available at: https://digitalcommons.macalester.edu/mjpa/vol10/iss1/8