A Long Time Ago in a Galaxy Far, Far Away: A Candidate z similar to 12 Galaxy in Early JWST CEERS Imaging
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A Long Time Ago in a Galaxy Far, Far Away : A Candidate z similar to 12 Galaxy in Early JWST CEERS Imaging. / Finkelstein, Steven L.; Bagley, Micaela B.; Haro, Pablo Arrabal; Dickinson, Mark; Ferguson, Henry C.; Kartaltepe, Jeyhan S.; Papovich, Casey; Burgarella, Denis; Kocevski, Dale D.; Huertas-Company, Marc; Iyer, Kartheik G.; Koekemoer, Anton M.; Larson, Rebecca L.; Perez-Gonzalez, Pablo G.; Rose, Caitlin; Tacchella, Sandro; Wilkins, Stephen M.; Chworowsky, Katherine; Medrano, Aubrey; Morales, Alexa M.; Somerville, Rachel S.; Yung, L. Y. Aaron; Fontana, Adriano; Giavalisco, Mauro; Grazian, Andrea; Grogin, Norman A.; Kewley, Lisa J.; Kirkpatrick, Allison; Kurczynski, Peter; Lotz, Jennifer M.; Pentericci, Laura; Pirzkal, Nor; Ravindranath, Swara; Ryan, Russell E.; Trump, Jonathan R.; Yang, Guang; Almaini, Omar; Amorin, Ricardo O.; Annunziatella, Marianna; Backhaus, Bren E.; Barro, Guillermo; Behroozi, Peter; Bell, Eric F.; Bhatawdekar, Rachana; Bisigello, Laura; Bromm, Volker; Fujimoto, Seiji; Gomez-Guijarro, Carlos; Hirschmann, Michaela; Matharu, Jasleen; CEERS Team.
In: Astrophysical Journal Letters, Vol. 940, No. 2, 55, 01.12.2022.Research output: Contribution to journal › Letter › Research › peer-review
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TY - JOUR
T1 - A Long Time Ago in a Galaxy Far, Far Away
T2 - A Candidate z similar to 12 Galaxy in Early JWST CEERS Imaging
AU - Finkelstein, Steven L.
AU - Bagley, Micaela B.
AU - Haro, Pablo Arrabal
AU - Dickinson, Mark
AU - Ferguson, Henry C.
AU - Kartaltepe, Jeyhan S.
AU - Papovich, Casey
AU - Burgarella, Denis
AU - Kocevski, Dale D.
AU - Huertas-Company, Marc
AU - Iyer, Kartheik G.
AU - Koekemoer, Anton M.
AU - Larson, Rebecca L.
AU - Perez-Gonzalez, Pablo G.
AU - Rose, Caitlin
AU - Tacchella, Sandro
AU - Wilkins, Stephen M.
AU - Chworowsky, Katherine
AU - Medrano, Aubrey
AU - Morales, Alexa M.
AU - Somerville, Rachel S.
AU - Yung, L. Y. Aaron
AU - Fontana, Adriano
AU - Giavalisco, Mauro
AU - Grazian, Andrea
AU - Grogin, Norman A.
AU - Kewley, Lisa J.
AU - Kirkpatrick, Allison
AU - Kurczynski, Peter
AU - Lotz, Jennifer M.
AU - Pentericci, Laura
AU - Pirzkal, Nor
AU - Ravindranath, Swara
AU - Ryan, Russell E.
AU - Trump, Jonathan R.
AU - Yang, Guang
AU - Almaini, Omar
AU - Amorin, Ricardo O.
AU - Annunziatella, Marianna
AU - Backhaus, Bren E.
AU - Barro, Guillermo
AU - Behroozi, Peter
AU - Bell, Eric F.
AU - Bhatawdekar, Rachana
AU - Bisigello, Laura
AU - Bromm, Volker
AU - Fujimoto, Seiji
AU - Gomez-Guijarro, Carlos
AU - Hirschmann, Michaela
AU - Matharu, Jasleen
AU - CEERS Team
PY - 2022/12/1
Y1 - 2022/12/1
N2 - We report the discovery of a candidate galaxy with a photo -z of z similar to 12 in the first epoch of the James Webb Space Telescope (JWST) Cosmic Evolution Early Release Science Survey. Following conservative selection criteria, we identify a source with a robust zphot = 11.8(+0.3) (-0.2) (1 sigma uncertainty) with m(F200W) = 27.3 and > 7 sigma detections in five filters. The source is not detected at lambda < 1.4 mu m in deep imaging from both Hubble Space Telescope (HST) and JWST and has faint similar to 3 sigma detections in JWST F150W and HST F160W, which signal a Ly alpha break near the red edge of both filters, implying z similar to 12. This object (Maisie's Galaxy) exhibits F115W - F200W > 1.9 mag (2 sigma lower limit) with a blue continuum slope, resulting in 99.6% of the photo-z probability distribution function favoring z > 11. All data-quality images show no artifacts at the candidate's position, and independent analyses consistently find a strong preference for z > 11. Its colors are inconsistent with Galactic stars, and it is resolved (r(h) = 340 +/- 14 pc). Maisie's Galaxy has log M-*/M-?similar to 8.5 and is highly star-forming (log sSFR similar to -8.2 yr(-1)), with a blue rest-UV color (beta similar to -2.5) indicating little dust, though not extremely low metallicity. While the presence of this source is in tension with most predictions, it agrees with empirical extrapolations assuming UV luminosity functions that smoothly decline with increasing redshift. Should follow-up spectroscopy validate this redshift, our universe was already aglow with galaxies less than 400 Myr after the Big Bang.
AB - We report the discovery of a candidate galaxy with a photo -z of z similar to 12 in the first epoch of the James Webb Space Telescope (JWST) Cosmic Evolution Early Release Science Survey. Following conservative selection criteria, we identify a source with a robust zphot = 11.8(+0.3) (-0.2) (1 sigma uncertainty) with m(F200W) = 27.3 and > 7 sigma detections in five filters. The source is not detected at lambda < 1.4 mu m in deep imaging from both Hubble Space Telescope (HST) and JWST and has faint similar to 3 sigma detections in JWST F150W and HST F160W, which signal a Ly alpha break near the red edge of both filters, implying z similar to 12. This object (Maisie's Galaxy) exhibits F115W - F200W > 1.9 mag (2 sigma lower limit) with a blue continuum slope, resulting in 99.6% of the photo-z probability distribution function favoring z > 11. All data-quality images show no artifacts at the candidate's position, and independent analyses consistently find a strong preference for z > 11. Its colors are inconsistent with Galactic stars, and it is resolved (r(h) = 340 +/- 14 pc). Maisie's Galaxy has log M-*/M-?similar to 8.5 and is highly star-forming (log sSFR similar to -8.2 yr(-1)), with a blue rest-UV color (beta similar to -2.5) indicating little dust, though not extremely low metallicity. While the presence of this source is in tension with most predictions, it agrees with empirical extrapolations assuming UV luminosity functions that smoothly decline with increasing redshift. Should follow-up spectroscopy validate this redshift, our universe was already aglow with galaxies less than 400 Myr after the Big Bang.
KW - STAR-FORMATION HISTORIES
KW - EPOCH SIMULATIONS FLARES
KW - LUMINOSITY FUNCTION
KW - SEMIANALYTIC FORECASTS
KW - SPACE-TELESCOPE
KW - 1ST GALAXIES
KW - LIGHT-CONES
KW - L-DWARF
KW - STELLAR
KW - MASS
U2 - 10.3847/2041-8213/ac966e
DO - 10.3847/2041-8213/ac966e
M3 - Letter
VL - 940
JO - The Astrophysical Journal Letters
JF - The Astrophysical Journal Letters
SN - 2041-8205
IS - 2
M1 - 55
ER -
ID: 334660174