ALMA FIR View of Ultra-high-redshift Galaxy Candidates at z ∼ 11-17: Blue Monsters or Low-z Red Interlopers?

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Fujimoto_2023_ApJ_955_130.pdf (2.76 MB)

Date

2023/10/01

Authors

Fujimoto, Seiji, Finkelstein, Steven L., Burgarella, Denis, Carilli, Chris L., Buat, Veronique, Casey, Caitlin M., Ciesla, Laure, Tacchella, Sandro, Zavala, Jorge A., Brammer, Gabriel, Fudamoto, Yoshinobu, Ouchi, Masami, Valentino, Francesco, Cooper, M. C., Dickinson, Mark, Franco, Maximilien, Giavalisco, Mauro, Hutchison, Taylor A., Kartaltepe, Jeyhan S., Koekemoer, Anton M., Kojima, Takashi, Larson, Rebecca L., Murphy, E. J., Papovich, Casey, Perez-Gonzalez, Pablo G., Somerville, Rachel S., Yoon, Ilsang, Wilkins, Stephen M., Akins, Hollis, Amorin, Ricardo O., Haro, Pablo Arrabal, Bagley, Micaela B., Chworowsky, Katherine, Cleri, Nikko J., Cooper, Olivia R., Costantin, Luca, Daddi, Emanuele, Ferguson, Henry C., Grogin, Norman A., Jimenez-Andrade, E. F., Juneau, Stephanie, Kirkpatrick, Allison, Kocevski, Dale D., Le Bail, Aurelien, Long, Arianna, Lucas, Ray A., Magnelli, Benjamin, McKinney, Jed, Rose, Caitlin, Seille, Lise-Marie, Simons, Raymond C., Weiner, Benjamin J., Yung, L. Y. Aaron

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Journal ISSN

Volume Title

Publisher

IOP Publishing Ltd

Abstract

We present Atacama Large Millimeter/submillimeter Array (ALMA) Band 7 observations of a remarkably bright galaxy candidate at (M-UV = -21.6), S5-z17-1, identified in James Webb Space Telescope (JWST) Early Release Observation data of Stephen's Quintet. We do not detect the dust continuum at 866 mu m, ruling out the possibility that S5-z17-1 is a low-z dusty starburst with a star formation rate of greater than or similar to 30 M-circle dot yr(-1). We detect a 5.1s line feature at 338.726 +/- 0.007 GHz exactly coinciding with the JWST source position, with a 2% likelihood of the signal being spurious. The most likely line identification would be [O III]52 mu m at z = 16.01 or [C II]158 mu m at z = 4.61, whose line luminosities do not violate the nondetection of the dust continuum in both cases. Together with three other z greater than or similar to 11-13 candidate galaxies recently observed with ALMA, we conduct a joint ALMA and JWST spectral energy distribution (SED) analysis and find that the high-z solution at z similar to 11-17 is favored in every candidate as a very blue (UV continuum slope of similar or equal to-2.3) and luminous (M-UV similar or equal to [ - 24:-21]) system. Still, we find in several candidates that reasonable SED fits (Delta chi(2) less than or similar to 4) are reproduced by type II quasar and/or quiescent galaxy templates with strong emission lines at z similar to 3-5, where such populations predicted from their luminosity functions and EW([O iii]+H beta) distributions are abundant in survey volumes used for the identification of the z similar to 11-17 candidates. While these recent ALMA observation results have strengthened the likelihood of the high-z solutions, lower-z possibilities are not completely ruled out in several of the z similar to 11-17 candidates, indicating the need to consider the relative surface densities of the lower-z contaminants in the ultra-high-z galaxy search.

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Keywords

STELLAR POPULATION SYNTHESIS, DUST-OBSCURED GALAXIES, STAR-FORMING GALAXY, ULTRAVIOLET LUMINOSITY FUNCTIONS, SPECTRAL ENERGY-DISTRIBUTIONS, MASSIVE QUIESCENT GALAXIES, ACTIVE GALACTIC NUCLEI, HUBBLE-SPACE-TELESCOPE, SPECTROSCOPIC CONFIRMATION, PHYSICAL-PROPERTIES

Citation

URI

https://publicacionesabiertas.userena.cl/handle/123456789/138

Collections

Astronomía