Exploring the Neutral Gas Content in Green Pea Galaxies

J1608 is the most highly ionized star-forming galaxy in all of SDSS.

Dwarf galaxies may have been responsible for reionizing the Universe nearly 13 Billion years ago. J1608, a Green Pea galaxy similar to high-redshift dwarfs, is a unique laboratory for studying star-formation and Lyman radiation in extreme environments. VLA 21cm observations indicate that this unusual Green Pea may host a fairly typical gas reservoir for its stellar mass. However, J1608's star-formation properties are orders of magnitude greater than other dwarf galaxies. What do the neutral gas properties of J1608 tell us about this extreme regime? 

Enhanced Lyman-alpha escape at low covering fractions. 

Ultraviolet observations of highly-ionized Green Peas indicate that the escape of UV photons may happen through optically thin channels in an otherwise optically thick ISM. Observing escaping radiation may depend on a Green Pea's orientation along the line of sight. What do gas velocities and covering fractions tell us about the role of feedback in creating these channels in the ISM? Do our results match those from high-redshift? 

University of Massachusetts, Amherst. 

© 2023 by space aliens

Image credit: 

Four ALMA antennas on the Chajnantor plain. 

ESO/José Francisco Salgado (josefrancisco.org)

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