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A search for correlations between turbulence and star formation in LITTLE THINGS and THINGS galaxies

Published online by Cambridge University Press:  09 June 2023

Bruce G. Elmegreen Open the ORCID record for Bruce G. Elmegreen [Opens in a new window] ,
Deidre Hunter ,
Zorayda Martinez ,
Haylee Archer ,
Caroline E. Simpson  and
Phil Cigan
Bruce G. Elmegreen
Affiliation:
IBM Research, T.J. Watson Research Center, 1101 Kitchawan Road, Yorktown Heights, NY 10598
Deidre Hunter
Affiliation:
Lowell Observatory, 1400 West Mars Hill Road, Flagstaff, Arizona 86001, USA
Zorayda Martinez
Affiliation:
Lowell Observatory, 1400 West Mars Hill Road, Flagstaff, Arizona 86001, USA Department of Astronomy and Planetary Science, Northern Arizona University, 527 S. Beaver Street, Flastaff, Arizona 86011
Haylee Archer
Affiliation:
Lowell Observatory, 1400 West Mars Hill Road, Flagstaff, Arizona 86001, USA
Caroline E. Simpson
Affiliation:
Department of Physics, Florida International University, CP 204, 11200 SW 8th Street, Miami, FL 33199 USA
Phil Cigan
Affiliation:
George Mason University, 4400 University Drive, Fairfax, VA 22030-4444, USA
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Abstract

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Azimuthal variations in HI velocity dispersion do not correlate with variations in the star formation rate per unit area, SFR/A, suggesting that local star formation does not increase HI turbulence significantly. These variations are determined for each pixel in HI and FUV maps of THINGS and LITTLE THINGS galaxies by subtracting the average radial profiles from the measured quantities. The kinetic energy density and HI surface density increase slightly with SFR/A, suggesting that feedback goes into pushing the local dense gas around without increasing the velocity dispersion. We suggest that star formation feedback does not promote large-scale stability against gravitational forces through turbulence regulation, and that gravitational energy from recurrent instabilities drives turbulence on galactic scales.

Keywords

star formationgravitational instabilityturbulencefeedback
Type
Contributed Paper
Information
Proceedings of the International Astronomical Union , Volume 17 , Symposium S373: Resolving the Rise and Fall of Star Formation in Galaxies , August 2021 , pp. 93 - 97
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Copyright
© The Author(s), 2023. Published by Cambridge University Press on behalf of International Astronomical Union

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