We present neutral hydrogen (HI) observations from the Very Large Array (VLA) telescope of the galaxies Haro 11, Pox 186, and VCC 1313. 24 hours of deep spectral line observation at the 21 cm line were obtained from the program 17B-287 of Haro 11, the primary galaxy studied in this capstone, and 176 and 203 respective minutes of archival VLA data at the 21 cm line were obtained from the program AS0832 of Pox 186 and VCC 1313, the secondary and tertiary sources of study for this capstone. Haro 11 is one of a very small number of local dwarf galaxies to be both a Lyα and LyC emitter. While it harbors ongoing aggressive star formation (with sources reporting up to 32.8 M☉ yr-1), the neutral hydrogen gas in the system has been notoriously difficult to detect. Previous interferometric observations have resulted in non-detections, while a deep Green Bank Telescope (GBT) spectrum reveals a weak spectral line. Our emission result is a non-detection, while our absorption result is a detection, confirming the results of similar, previously conducted absorption work. Past interferometric research has additionally resulted in HI non-detections for both Pox 186 and VCC 1313. Our results from archival data are also two HI non-detections, confirming the results of past research. For all three systems, given their aggressive star formation rates, these HI non-detection results are surprising. The behavior of these systems remains highly enigmatic.
Taft, Sarah H.
"Haro 11, Pox 186, and VCC 1313: The Enigmatic Behavior of HI Non-Emitters,"
Macalester Journal of Physics and Astronomy: Vol. 7
, Article 8.
Available at: https://digitalcommons.macalester.edu/mjpa/vol7/iss1/8