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Massive galaxy mergers have distinctive global H I profiles

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Jinyi,  Shangguan
Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

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Citation

Zuo, P., Ho, L. C., Wang, J., Yu, N., & Jinyi, S. (2022). Massive galaxy mergers have distinctive global H I profiles. The Astrophysical Journal, 929(1): 15. doi:10.3847/1538-4357/ac561f.


Cite as: http://hdl.handle.net/21.11116/0000-000A-AD1E-3
Abstract
The global 21 cm H i emission-line profile of a galaxy encodes valuable information on the spatial distribution and kinematics of the neutral atomic gas. Galaxy interactions significantly influence the H i disk and imprint observable features on the integrated H i line profile. In this work, we study the neutral atomic gas properties of galaxy mergers selected from the Great Observatories All-sky LIRG Survey. The H i spectra come from new observations with the Five-hundred-meter Aperture Spherical Telescope and from a collection of archival data. We quantify the H i profile of the mergers with a newly developed method that uses the curve of growth of the line profile. Using a control sample of non-merger galaxies carefully selected to match the stellar mass of the merger sample, we show that mergers have a larger proportion of single-peaked H i profiles, as well as a greater tendency for the H i central velocity to deviate from the systemic optical velocity of the galaxy. By contrast, the H i profiles of mergers are not significantly more asymmetric than those of non-mergers.