JWST Reveals a Possible z ∼ 11 Galaxy Merger in Triply Lensed MACS0647-JD
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JWST Reveals a Possible z ∼ 11 Galaxy Merger in Triply Lensed MACS0647-JD. / Hsiao, Tiger Yu Yang; Coe, Dan; Abdurro’uf; Whitler, Lily; Jung, Intae; Khullar, Gourav; Meena, Ashish Kumar; Dayal, Pratika; Barrow, Kirk S.S.; Santos-Olmsted, Lillian; Casselman, Adam; Vanzella, Eros; Nonino, Mario; Jiménez-Teja, Yolanda; Oguri, Masamune; Stark, Daniel P.; Furtak, Lukas J.; Zitrin, Adi; Adamo, Angela; Brammer, Gabriel; Bradley, Larry; Diego, Jose M.; Zackrisson, Erik; Finkelstein, Steven L.; Windhorst, Rogier A.; Bhatawdekar, Rachana; Hutchison, Taylor A.; Broadhurst, Tom; Dimauro, Paola; Andrade-Santos, Felipe; Eldridge, Jan J.; Acebron, Ana; Avila, Roberto J.; Bayliss, Matthew B.; Benítez, Alex; Binggeli, Christian; Bolan, Patricia; Bradač, Maruša; Carnall, Adam C.; Conselice, Christopher J.; Donahue, Megan; Frye, Brenda; Fujimoto, Seiji; Henry, Alaina; James, Bethan L.; Kassin, Susan A.; Kewley, Lisa; Larson, Rebecca L.; Lauer, Tod; Law, David; Mahler, Guillaume; Mainali, Ramesh; McCandliss, Stephan; Nicholls, David; Pirzkal, Norbert; Postman, Marc; Rigby, Jane R.; Ryan, Russell; Senchyna, Peter; Sharon, Keren; Shimizu, Ikko; Strait, Victoria; Tang, Mengtao; Trenti, Michele; Vikaeus, Anton; Welch, Brian.
I: Astrophysical Journal Letters, Bind 949, Nr. 2, L34, 02.06.2023.Publikation: Bidrag til tidsskrift › Letter › Forskning › fagfællebedømt
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T1 - JWST Reveals a Possible z ∼ 11 Galaxy Merger in Triply Lensed MACS0647-JD
AU - Hsiao, Tiger Yu Yang
AU - Coe, Dan
AU - Abdurro’uf, null
AU - Whitler, Lily
AU - Jung, Intae
AU - Khullar, Gourav
AU - Meena, Ashish Kumar
AU - Dayal, Pratika
AU - Barrow, Kirk S.S.
AU - Santos-Olmsted, Lillian
AU - Casselman, Adam
AU - Vanzella, Eros
AU - Nonino, Mario
AU - Jiménez-Teja, Yolanda
AU - Oguri, Masamune
AU - Stark, Daniel P.
AU - Furtak, Lukas J.
AU - Zitrin, Adi
AU - Adamo, Angela
AU - Brammer, Gabriel
AU - Bradley, Larry
AU - Diego, Jose M.
AU - Zackrisson, Erik
AU - Finkelstein, Steven L.
AU - Windhorst, Rogier A.
AU - Bhatawdekar, Rachana
AU - Hutchison, Taylor A.
AU - Broadhurst, Tom
AU - Dimauro, Paola
AU - Andrade-Santos, Felipe
AU - Eldridge, Jan J.
AU - Acebron, Ana
AU - Avila, Roberto J.
AU - Bayliss, Matthew B.
AU - Benítez, Alex
AU - Binggeli, Christian
AU - Bolan, Patricia
AU - Bradač, Maruša
AU - Carnall, Adam C.
AU - Conselice, Christopher J.
AU - Donahue, Megan
AU - Frye, Brenda
AU - Fujimoto, Seiji
AU - Henry, Alaina
AU - James, Bethan L.
AU - Kassin, Susan A.
AU - Kewley, Lisa
AU - Larson, Rebecca L.
AU - Lauer, Tod
AU - Law, David
AU - Mahler, Guillaume
AU - Mainali, Ramesh
AU - McCandliss, Stephan
AU - Nicholls, David
AU - Pirzkal, Norbert
AU - Postman, Marc
AU - Rigby, Jane R.
AU - Ryan, Russell
AU - Senchyna, Peter
AU - Sharon, Keren
AU - Shimizu, Ikko
AU - Strait, Victoria
AU - Tang, Mengtao
AU - Trenti, Michele
AU - Vikaeus, Anton
AU - Welch, Brian
N1 - Publisher Copyright: © 2023. The Author(s). Published by the American Astronomical Society.
PY - 2023/6/2
Y1 - 2023/6/2
N2 - MACS0647-JD is a triply lensed z ∼ 11 galaxy originally discovered with the Hubble Space Telescope. The three lensed images are magnified by factors of ∼8, 5, and 2 to AB mag 25.1, 25.6, and 26.6 at 3.5 μm. The brightest is over a magnitude brighter than other galaxies recently discovered at similar redshifts z > 10 with JWST. Here, we report new JWST imaging that clearly resolves MACS0647-JD as having two components that are either merging galaxies or stellar complexes within a single galaxy. The brighter larger component “A” is intrinsically very blue (β ∼ −2.6 ± 0.1), likely due to very recent star formation and no dust, and is spatially extended with an effective radius ∼70 ± 24 pc. The smaller component “B” (r ∼ 20 − 5 + 8 pc) appears redder (β ∼ −2 ± 0.2), likely because it is older (100-200 Myr) with mild dust extinction (A V ∼ 0.1 mag). With an estimated stellar mass ratio of roughly 2:1 and physical projected separation ∼400 pc, we may be witnessing a galaxy merger 430 million years after the Big Bang. We identify galaxies with similar colors in a high-redshift simulation, finding their star formation histories to be dissimilar, which is also suggested by the spectral energy distribution fitting, suggesting they formed further apart. We also identify a candidate companion galaxy “C” ∼3 kpc away, likely destined to merge with A and B. Upcoming JWST Near Infrared Spectrograph observations planned for 2023 January will deliver spectroscopic redshifts and more physical properties for these tiny magnified distant galaxies observed in the early universe.
AB - MACS0647-JD is a triply lensed z ∼ 11 galaxy originally discovered with the Hubble Space Telescope. The three lensed images are magnified by factors of ∼8, 5, and 2 to AB mag 25.1, 25.6, and 26.6 at 3.5 μm. The brightest is over a magnitude brighter than other galaxies recently discovered at similar redshifts z > 10 with JWST. Here, we report new JWST imaging that clearly resolves MACS0647-JD as having two components that are either merging galaxies or stellar complexes within a single galaxy. The brighter larger component “A” is intrinsically very blue (β ∼ −2.6 ± 0.1), likely due to very recent star formation and no dust, and is spatially extended with an effective radius ∼70 ± 24 pc. The smaller component “B” (r ∼ 20 − 5 + 8 pc) appears redder (β ∼ −2 ± 0.2), likely because it is older (100-200 Myr) with mild dust extinction (A V ∼ 0.1 mag). With an estimated stellar mass ratio of roughly 2:1 and physical projected separation ∼400 pc, we may be witnessing a galaxy merger 430 million years after the Big Bang. We identify galaxies with similar colors in a high-redshift simulation, finding their star formation histories to be dissimilar, which is also suggested by the spectral energy distribution fitting, suggesting they formed further apart. We also identify a candidate companion galaxy “C” ∼3 kpc away, likely destined to merge with A and B. Upcoming JWST Near Infrared Spectrograph observations planned for 2023 January will deliver spectroscopic redshifts and more physical properties for these tiny magnified distant galaxies observed in the early universe.
U2 - 10.3847/2041-8213/acc94b
DO - 10.3847/2041-8213/acc94b
M3 - Letter
AN - SCOPUS:85161474266
VL - 949
JO - The Astrophysical Journal Letters
JF - The Astrophysical Journal Letters
SN - 2041-8205
IS - 2
M1 - L34
ER -
ID: 361549041