TY - JOUR
T1 - The MAGPI survey
T2 - evolution of radial trends in star formation activity across cosmic time
AU - Mun, Marcie
AU - Wisnioski, Emily
AU - Battisti, Andrew J.
AU - Mendel, J. Trevor
AU - Ellison, Sara L.
AU - Taylor, Edward N.
AU - Lagos, Claudia D. P.
AU - Harborne, Katherine E.
AU - Foster, Caroline
AU - Croom, Scott M.
AU - Bellstedt, Sabine
AU - Barsanti, Stefania
AU - Gupta, Anshu
AU - Valenzuela, Lucas M.
AU - Chen, Qian-Hui
AU - Grasha, Kathryn
AU - Mukherjee, Tamal
AU - Park, Hye-Jin
AU - Sharda, Piyush
AU - Sweet, Sarah M.
AU - Remus, Rhea-Silvia
AU - Zafar, Tayyaba
N1 - © The Author(s) 2024. Published by Oxford University Press on behalf of Royal Astronomical Society. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.
PY - 2024/6/1
Y1 - 2024/6/1
N2 - Using adaptive optics with the Multi-Unit Spectroscopic Explorer on the Very Large Telescope, the Middle Ages Galaxy Properties with Integral Field Spectroscopy survey allows us to study the spatially resolved Universe at a crucial time of ∼4 Gyr ago (z ∼ 0.3) when simulations predict the greatest diversity in evolutionary pathways for galaxies. We investigate the radial trends in the star formation (SF) activity and luminosity-weighted stellar ages as a function of offset from the star-forming main sequence (SFMS) for a total of 294 galaxies. Using both Hα emission and the 4000 Å break (i.e. D4000) as star formation rate (SFR) tracers, we find overall flat radial profiles for galaxies lying on and above the SFMS, suggestive of physical processes that enhance/regulate SF throughout the entire galaxy disc. However, for galaxies lying below the SFMS, we find positive gradients in SF suggestive of inside–out quenching. Placing our results in context with results from other redshift regimes suggests an evolution in radial trends at z ∼ 0.3 for SF galaxies above the SFMS, from uniformly enhanced SF at z ∼ 1 and ∼ 0.3 to centrally enhanced SF at z ∼ 0 (when averaged over a wide range of mass). We also capture higher local SFRs for galaxies below the SFMS compared to that of z ∼ 0, which can be explained by a larger population of quenched satellites in the local Universe and/or different treatments of limitations set by the D4000–sSFR relation.
AB - Using adaptive optics with the Multi-Unit Spectroscopic Explorer on the Very Large Telescope, the Middle Ages Galaxy Properties with Integral Field Spectroscopy survey allows us to study the spatially resolved Universe at a crucial time of ∼4 Gyr ago (z ∼ 0.3) when simulations predict the greatest diversity in evolutionary pathways for galaxies. We investigate the radial trends in the star formation (SF) activity and luminosity-weighted stellar ages as a function of offset from the star-forming main sequence (SFMS) for a total of 294 galaxies. Using both Hα emission and the 4000 Å break (i.e. D4000) as star formation rate (SFR) tracers, we find overall flat radial profiles for galaxies lying on and above the SFMS, suggestive of physical processes that enhance/regulate SF throughout the entire galaxy disc. However, for galaxies lying below the SFMS, we find positive gradients in SF suggestive of inside–out quenching. Placing our results in context with results from other redshift regimes suggests an evolution in radial trends at z ∼ 0.3 for SF galaxies above the SFMS, from uniformly enhanced SF at z ∼ 1 and ∼ 0.3 to centrally enhanced SF at z ∼ 0 (when averaged over a wide range of mass). We also capture higher local SFRs for galaxies below the SFMS compared to that of z ∼ 0, which can be explained by a larger population of quenched satellites in the local Universe and/or different treatments of limitations set by the D4000–sSFR relation.
KW - galaxies: evolution
KW - galaxies: general
KW - galaxies: star formation
KW - galaxies: statistics
UR - http://www.scopus.com/inward/record.url?scp=85193419661&partnerID=8YFLogxK
UR - http://purl.org/au-research/grants/arc/CE170100013
U2 - 10.1093/mnras/stae1132
DO - 10.1093/mnras/stae1132
M3 - Article
AN - SCOPUS:85193419661
SN - 0035-8711
VL - 530
SP - 5072
EP - 5090
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
IS - 4
ER -