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JWST unveils a population of “red-excess” galaxies in Abell2744 and in the coeval field

Published online by Cambridge University Press:  13 February 2024

Benedetta Vulcani Open the ORCID record for Benedetta Vulcani [Opens in a new window]  and
GLASS team
Benedetta Vulcani*
Affiliation:
INAF Osservatorio Astronomico di Padova, vicolo dell’Osservatorio 5, 35122 Padova, Italy.
*
email: benedetta.vulcani@inaf.it
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Abstract

We combine JWST/NIRCam imaging and MUSE data to characterize the properties of galaxies in the cluster Abell2744 (z=0.3064) and in its immediate surroundings. We discover a “red-excess” population in F200W–F444W colors in both the cluster regions and the field. These galaxies have normal F115W-F150W colors and rather blue rest frame B–V colors, but are up to 0.8 mag redder than red sequence galaxies in F200W–F444W. Considering morphology, many cluster galaxies show signatures consistent with ram pressure stripping, while field galaxies have features resembling interactions and mergers. Our hypothesis is that these galaxies are characterized by dust enshrouded star formation: a JWST/NIRSpec spectrum for one of the galaxies is dominated by a strong PAH at 3.3 μm, suggestive of dust obscured star formation.

Keywords

Galaxies: formationGalaxies: evolutionGalaxies: clusters
Type
Contributed Paper
Information
Proceedings of the International Astronomical Union , Volume 18 , Symposium S377: Early Disk-Galaxy Formation from JWST to the Milky Way , December 2022 , pp. 22 - 26
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Copyright
© The Author(s), 2024. Published by Cambridge University Press on behalf of International Astronomical Union

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