TY - JOUR
T1 - The MAGPI Survey
T2 - The evolution and drivers of gas turbulence in intermediate-redshift galaxies
AU - Mai, Yifan
AU - Croom, Scott M.
AU - Wisnioski, Emily
AU - Vaughan, Sam P.
AU - Varidel, Mathew R.
AU - Battisti, Andrew J.
AU - Mendel, J. Trevor
AU - Mun, Marcie
AU - Tsukui, Takafumi
AU - Foster, Caroline
AU - Harborne, Katherine E.
AU - Lagos, Claudia D.P.
AU - Wang, Di
AU - Bellstedt, Sabine
AU - Bland-Hawthorn, Joss
AU - Colless, Matthew
AU - D'Eugenio, Francesco
AU - Grasha, Kathryn
AU - Peng, Yingjie
AU - Santucci, Giulia
AU - Sweet, Sarah M.
AU - Thater, Sabine
AU - Valenzuela, Lucas M.
AU - Ziegler, Bodo
N1 - Publisher Copyright:
© 2024 The Author(s). Published by Oxford University Press on behalf of Royal Astronomical Society.
PY - 2024/10/1
Y1 - 2024/10/1
N2 - We measure the ionized gas velocity dispersions of star-forming galaxies in the MAGPI survey (z∼.03) and compare them with galaxies in the SAMI (z∼0.05) and KROSS (z∼1) surveys to investigate how the ionized gas velocity dispersion evolves. For the first time, we use a consistent method that forward models galaxy kinematics from z=0 to z=1. This method accounts for spatial substructure in emission line flux and beam smearing. We investigate the correlation between gas velocity dispersion and galaxy properties to understand the mechanisms that drive gas turbulence. We find that in both MAGPI and SAMI galaxies, the gas velocity dispersion more strongly correlates with the star-formation rate surface density (ΣSFR) than with a variety of other physical properties, and the average gas velocity dispersion is similar, at the same, for SAMI, MAGPI, and KROSS galaxies. The results indicate that mechanisms related to ΣSFR could be the dominant driver of gas turbulence from z∼1 to z∼0, for example, stellar feedback and/or gravitational instability. The gas velocity dispersion of MAGPI galaxies is also correlated with the non-rotational motion of the gas, illustrating that in addition to star-formation feedback, gas transportation and accretion may also contribute to the gas velocity dispersion for galaxies at z∼0.3. KROSS galaxies only have a moderate correlation between gas velocity dispersion and ΣSFR and a higher scatter of gas velocity dispersion with respect to, in agreement with the suggestion that other mechanisms, such as gas transportation and accretion, are relatively more important at higher redshift galaxies.
AB - We measure the ionized gas velocity dispersions of star-forming galaxies in the MAGPI survey (z∼.03) and compare them with galaxies in the SAMI (z∼0.05) and KROSS (z∼1) surveys to investigate how the ionized gas velocity dispersion evolves. For the first time, we use a consistent method that forward models galaxy kinematics from z=0 to z=1. This method accounts for spatial substructure in emission line flux and beam smearing. We investigate the correlation between gas velocity dispersion and galaxy properties to understand the mechanisms that drive gas turbulence. We find that in both MAGPI and SAMI galaxies, the gas velocity dispersion more strongly correlates with the star-formation rate surface density (ΣSFR) than with a variety of other physical properties, and the average gas velocity dispersion is similar, at the same, for SAMI, MAGPI, and KROSS galaxies. The results indicate that mechanisms related to ΣSFR could be the dominant driver of gas turbulence from z∼1 to z∼0, for example, stellar feedback and/or gravitational instability. The gas velocity dispersion of MAGPI galaxies is also correlated with the non-rotational motion of the gas, illustrating that in addition to star-formation feedback, gas transportation and accretion may also contribute to the gas velocity dispersion for galaxies at z∼0.3. KROSS galaxies only have a moderate correlation between gas velocity dispersion and ΣSFR and a higher scatter of gas velocity dispersion with respect to, in agreement with the suggestion that other mechanisms, such as gas transportation and accretion, are relatively more important at higher redshift galaxies.
KW - galaxies: evolution
KW - galaxies: ISM
KW - galaxies: kinematics and dynamics
UR - http://www.scopus.com/inward/record.url?scp=85204039008&partnerID=8YFLogxK
U2 - 10.1093/mnras/stae2033
DO - 10.1093/mnras/stae2033
M3 - Article
AN - SCOPUS:85204039008
SN - 0035-8711
VL - 533
SP - 3878
EP - 3892
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
IS - 4
ER -