New Views of IC 10 in the Radio

• Author / Creator

  Corbould, Harrisen T

• In this thesis, we showcase new high-resolution VLA L-band data of IC 10, a dwarf
  irregular galaxy in the Local Group. IC 10 is a target of the Local Group L-band
  survey (LGLBS) due to its distance, location in the sky, and the fact that it is
  the only starbursting galaxy in the Local Group. Due to its low metallicity and
  proximity to the Milky Way, it is a unique candidate for studying star formation
  and galaxy formation in an environment similar to those in the early universe. This
  survey has both the highest spatial (4.5′′) and spectral (0.4 km/s) resolution HI
  21-cm data of IC 10 to date and the highest spatial resolution (1.5′′) L-band 1.0 -
  2.0 GHz continuum data. We create a catalog of compact continuum sources and
  classify them by their spectral index and position. We find 62 total sources, of these
  zero are identified as HII regions with α > −0.2, 19 are supernova remnants with a
  steep spectral index −0.8 < α < −0.2, and 43 are background galaxies with steep
  spectral indices α < −0.8. Using a spectral stacking technique, we compare CO (1-0)
  molecular gas emission with the HI 21-cm emission and recover ∼ 23% more emission
  than previously visible in the bright CO alone. Performing Gaussian decomposition
  on the HI and CO data we find the HI is composed of two components in many
  regions within the disk and we find that the CO emission is often but not necessarily
  associated with the brightest HI component. Lastly, we analyze an off-disk molecular
  cloud and find that it is surprisingly normal in its line widths, central velocities,
  and integrated intensity but displays a very high molecular gas fraction for its low
  dynamical equilibrium pressure due to the lack of a bright stellar population in the
  region.

• Subjects / Keywords

  • IC 10
  • Radio Astronomy
  • Interstellar medium
  • L-band
  • Neutral Hydrogen gas
  • Molecular gas
  • Spectral line stacking

• Graduation date

  Fall 2024

• Type of Item

  Thesis

• Degree

  Master of Science

• DOI

  https://doi.org/10.7939/r3-7p48-3f77

• License

  This thesis is made available by the University of Alberta Library with permission of the copyright owner solely for non-commercial purposes. This thesis, or any portion thereof, may not otherwise be copied or reproduced without the written consent of the copyright owner, except to the extent permitted by Canadian copyright law.