The Astrophysical Journal Letters (Jan 2023)
Early Results from GLASS-JWST. XX. Unveiling a Population of “Red Excess” Galaxies in Abell2744 and in the Coeval Field
- Benedetta Vulcani,
- Tommaso Treu,
- Antonello Calabrò,
- Jacopo Fritz,
- Bianca M. Poggianti,
- Pietro Bergamini,
- Andrea Bonchi,
- Kristan Boyett,
- Gabriel B. Caminha,
- Marco Castellano,
- Alan Dressler,
- Adriano Fontana,
- Karl Glazebrook,
- Claudio Grillo,
- Matthew A. Malkan,
- Sara Mascia,
- Amata Mercurio,
- Emiliano Merlin,
- Benjamin Metha,
- Takahiro Morishita,
- Themiya Nanayakkara,
- Diego Paris,
- Guido Roberts-Borsani,
- Piero Rosati,
- Namrata Roy,
- Paola Santini,
- Michele Trenti,
- Eros Vanzella,
- Xin Wang
Affiliations
- Benedetta Vulcani
- ORCiD
- INAF—Osservatorio astronomico di Padova , Vicolo Osservatorio 5, I-35122 Padova, Italy ; [email protected]
- Tommaso Treu
- ORCiD
- Department of Physics and Astronomy, University of California , Los Angeles, 430 Portola Plaza, Los Angeles, CA 90095, USA
- Antonello Calabrò
- ORCiD
- INAF—Osservatorio Astronomico di Roma , via di Frascati 33, I-00078 Monte Porzio Catone, Italy
- Jacopo Fritz
- ORCiD
- Instituto de Radioastronomia y Astrofisica , UNAM, Campus Morelia, AP 3-72, CP 58089, Mexico
- Bianca M. Poggianti
- ORCiD
- INAF—Osservatorio astronomico di Padova , Vicolo Osservatorio 5, I-35122 Padova, Italy ; [email protected]
- Pietro Bergamini
- ORCiD
- Dipartimento di Fisica, Universitá degli Studi di Milano , via Celoria 16, I-20133 Milano, Italy; INAF—OAS , Osservatorio di Astrofisica e Scienza dello Spazio di Bologna, via Gobetti 93/3, I-40129 Bologna, Italy
- Andrea Bonchi
- Space Science Data Center , Italian Space Agency, via del Politecnico, I-00133, Roma, Italy
- Kristan Boyett
- ORCiD
- School of Physics, University of Melbourne , Parkville, VIC 3010, Australia; ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D) , Australia
- Gabriel B. Caminha
- ORCiD
- Technische Universität München , Physik-Department, James-Franck Str. 1, D-85748 Garching, Germany; Max-Planck-Institut für Astrophysik , Karl-Schwarzschild-Str. 1, D-85748 Garching, Germany
- Marco Castellano
- ORCiD
- INAF—Osservatorio Astronomico di Roma , via di Frascati 33, I-00078 Monte Porzio Catone, Italy
- Alan Dressler
- ORCiD
- The Observatories, The Carnegie Institution for Science , 813 Santa Barbara St., Pasadena, CA 91101, USA
- Adriano Fontana
- ORCiD
- INAF—Osservatorio Astronomico di Roma , via di Frascati 33, I-00078 Monte Porzio Catone, Italy
- Karl Glazebrook
- ORCiD
- Centre for Astrophysics and Supercomputing, Swinburne University of Technology , PO Box 218, Hawthorn, VIC 3122, Australia
- Claudio Grillo
- ORCiD
- Dipartimento di Fisica, Universitá degli Studi di Milano , via Celoria 16, I-20133 Milano, Italy; INAFIASF Milano , via A. Corti 12, I-20133 Milano, Italy
- Matthew A. Malkan
- ORCiD
- Department of Physics and Astronomy, University of California , Los Angeles, 430 Portola Plaza, Los Angeles, CA 90095, USA
- Sara Mascia
- ORCiD
- INAF—Osservatorio Astronomico di Roma , via di Frascati 33, I-00078 Monte Porzio Catone, Italy
- Amata Mercurio
- ORCiD
- Dipartimento di Fisica “E.R. Caianiello,” Universitá Degli Studi di Salerno , Via Giovanni Paolo II, I-84084 Fisciano (SA), Italy; INAF—Osservatorio Astronomico di Capodimonte , Via Moiariello 16, I-80131 Napoli, Italy
- Emiliano Merlin
- ORCiD
- INAF—Osservatorio Astronomico di Roma , via di Frascati 33, I-00078 Monte Porzio Catone, Italy
- Benjamin Metha
- ORCiD
- Department of Physics and Astronomy, University of California , Los Angeles, 430 Portola Plaza, Los Angeles, CA 90095, USA; School of Physics, University of Melbourne , Parkville, VIC 3010, Australia; ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D) , Australia
- Takahiro Morishita
- ORCiD
- IPAC, California Institute of Technology , MC 314-6, 1200 E. California Boulevard, Pasadena, CA 91125, USA
- Themiya Nanayakkara
- ORCiD
- Centre for Astrophysics and Supercomputing, Swinburne University of Technology , PO Box 218, Hawthorn, VIC 3122, Australia
- Diego Paris
- ORCiD
- INAF—Osservatorio Astronomico di Roma , via di Frascati 33, I-00078 Monte Porzio Catone, Italy
- Guido Roberts-Borsani
- ORCiD
- Department of Physics and Astronomy, University of California , Los Angeles, 430 Portola Plaza, Los Angeles, CA 90095, USA
- Piero Rosati
- ORCiD
- INAF—OAS , Osservatorio di Astrofisica e Scienza dello Spazio di Bologna, via Gobetti 93/3, I-40129 Bologna, Italy; Dipartimento di Fisica e Scienze della Terra, Universitá degli Studi di Ferrara , Via Saragat 1, I-44122 Ferrara, Italy
- Namrata Roy
- ORCiD
- Center for Astrophysical Sciences, Department of Physics and Astronomy, Johns Hopkins University , Baltimore, MD 21218, USA
- Paola Santini
- ORCiD
- INAF—Osservatorio Astronomico di Roma , via di Frascati 33, I-00078 Monte Porzio Catone, Italy
- Michele Trenti
- ORCiD
- School of Physics, University of Melbourne , Parkville, VIC 3010, Australia; ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D) , Australia
- Eros Vanzella
- ORCiD
- INAF—OAS , Osservatorio di Astrofisica e Scienza dello Spazio di Bologna, via Gobetti 93/3, I-40129 Bologna, Italy
- Xin Wang
- ORCiD
- School of Astronomy and Space Science, University of Chinese Academy of Sciences (UCAS) , Beijing 100049, People's Republic of China; National Astronomical Observatories , Chinese Academy of Sciences, Beijing 100101, People's Republic of China; Institute for Frontiers in Astronomy and Astrophysics, Beijing Normal University , Beijing 102206, People's Republic of China
- DOI
- https://doi.org/10.3847/2041-8213/accbc4
- Journal volume & issue
-
Vol. 948,
no. 2
p. L15
Abstract
We combine JWST/NIRCam imaging and MUSE data to characterize the properties of galaxies in different environmental conditions in the cluster Abell2744 ( z = 0.3064) and in its immediate surroundings. We investigate how galaxy colors, morphology, and star-forming fractions depend on wavelength and on different parameterizations of environment. Our most striking result is the discovery of a “red excess” population in F200W−F444W colors in both the cluster regions and the field. These galaxies have normal F115W−F150W colors but are up to 0.8 mag redder than red sequence galaxies in F200W−F444W. They also have rather blue rest-frame B − V colors. Galaxies in the field and at the cluster virial radius are overall characterized by redder colors, but galaxies with the largest color deviations are found in the field and in the cluster core. Several results suggest that mechanisms taking place in these regions might be more effective in producing these colors. Looking at their 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 μ m, suggestive of dust-obscured star formation. Larger spectroscopic samples are needed to understand whether the color excess is due exclusively to dust-obscured star formation, as well as the role of environment in triggering it.
Keywords
