A Green Pea starburst arising from a galaxy-galaxy merger
S. Purkayastha (1), N. Kanekar (1), J. N. Chengalur (1), S. Malhotra, (2,3), J. Rhoads (2,3), and T. Ghosh (4) ((1) National Centre for Radio, Astrophysics, India, (2) NASA Goddard Space Flight Center, USA, (3) Arizona, State University, USA, (4) Green Bank Observatory, USA)

TL;DR
This study maps the atomic hydrogen distribution in a Green Pea galaxy, revealing a merger-triggered starburst and providing insights into how such galaxies allow ionizing radiation to escape, relevant for understanding early universe reionization.
Contribution
First spatial mapping of HI in a Green Pea galaxy, linking galaxy merger to starburst activity and ionizing radiation leakage.
Findings
HI forms a broken-ring around the galaxy
Starburst likely triggered by merger with a companion
HI distribution disturbances facilitate Ly-alpha and Lyman-continuum escape
Abstract
Green Pea galaxies are low-redshift starburst dwarf galaxies, with properties similar to those of the high-redshift galaxies that reionized the Universe. We report the first mapping of the spatial distribution of atomic hydrogen (HI) in and around a Green Pea, GP J0213+0056 at z=0.0399, using the Giant Metrewave Radio Telescope (GMRT). Like many Green Peas, GP J0213+0056 shows strong HI 21 cm emission in single-dish spectroscopy, strong Ly-alpha emission, and a high [OIII]5007/[OIII]3727 luminosity ratio, O32 8.8, consistent with a high leakage of Lyman-continuum radiation. Our GMRT HI 21 cm images show that the HI 21 cm emission in the field of GP J0213+0056 arises from an extended broken-ring structure around the Green Pea, with the strongest emission coming from a region between GP J0213+0056 and a companion galaxy lying 4.7 kpc away, and little…
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