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Colour gradients of low-redshift galaxies in the DESI Legacy Imaging Survey

Published online by Cambridge University Press:  09 June 2023

Li-Wen Liao Open the ORCID record for Li-Wen Liao [Opens in a new window]  and
Andrew P. Cooper
Li-Wen Liao
Affiliation:
Institute of Astronomy and Department of Physics, National Tsing Hua University, Hsinchu 30013, Taiwan Center for Informatics and Computation in Astronomy, National Tsing Hua University, Hsinchu 30013, Taiwan
Andrew P. Cooper
Affiliation:
Institute of Astronomy and Department of Physics, National Tsing Hua University, Hsinchu 30013, Taiwan Center for Informatics and Computation in Astronomy, National Tsing Hua University, Hsinchu 30013, Taiwan Physics Division, National Center for Theoretical Sciences, Taipei 10617, Taiwan
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Abstract

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Radial colour gradients within galaxies arise from gradients of stellar age, metallicity, and dust reddening. Large samples of colour gradients from wide-area imaging surveys can be used to constrain galaxy formation models. Here we measured colour gradients for low-redshift galaxies using photometry from the 9th DESI Legacy Imaging Survey (LS), which reaches r ∼ 24 over ∼14,000 deg2. We investigate empirical relationships between colour gradients, M*, and sSFR. We compared our results with the prediction of the Illustris TNG-100 simulation using SDSS mock images.

Keywords

galaxies: formationgalaxies: statisticsgalaxies: structuregalaxies: general
Type
Poster 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. 140 - 142
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Copyright
© The Author(s), 2023. Published by Cambridge University Press on behalf of International Astronomical Union

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