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Are JWST/NIRCam Color Gradients in the Lensed z = 2.3 Dusty Star-forming Galaxy El Anzuelo Due to Central Dust Attenuation or Inside-out Galaxy Growth?

Abstract: Gradients in the mass-to-light ratio of distant galaxies impede our ability to characterize their size and compactness. The long-wavelength filters of JWST?s NIRCam offer a significant step forward. For galaxies at Cosmic Noon (z ? 2), this regime corresponds to the rest-frame near-infrared, which is less biased toward young stars and captures emission from the bulk of a galaxy?s stellar population. We present an initial analysis of an extraordinary lensed dusty star-forming galaxy at z = 2.3 behind the El Gordo cluster (z = 0.87), named El Anzuelo (?The Fishhook?) after its partial Einstein-ring morphology. The far-UV to near-IR spectral energy distribution suggests an intrinsic star formation rate of 81 yr 2 7 M 1 - ?+ - and dust attenuation AV ? 1.6, in line with other DSFGs on the star-forming main sequence. We develop a parametric lens model to reconstruct the source plane structure of dust imaged by the Atacama Large Millimeter/submillimeter Array, far-UV to optical light from Hubble, and near-IR imaging with 8 filters of JWST/NIRCam, as part of the Prime Extragalactic Areas for Reionization and Lensing Science program. The source-plane half-light radius is remarkably consistent from ?1 to 4.5 ?m, despite a clear color gradient where the inferred galaxy center is redder than the outskirts. We interpret this to be the result of both a radially decreasing gradient in attenuation and substantial spatial offsets between UV- and IR-emitting components. A spatial decomposition of the SED reveals modestly suppressed star formation in the inner kiloparsec, which suggests that we are witnessing the early stages of inside-out quenching.

Otras publicaciones de la misma revista o congreso con autores/as de la Universidad de Cantabria

 Autoría: Kamieneski P.S., Frye B.L., Pascale M., Cohen S.H., Windhorst R.A., Jansen R.A., Yun M.S., Cheng C., Summers J.S., Carleton T., Harrington K.C., Diego J.M., Yan H., Koekemoer A.M., Willmer C.N.A., Petric A., Furtak L.J., Foo N., Conselice C.J., Coe D., Driver S.P., Grogin N.A., Marshall M.A., Nonino M., Pirzkal N., Robotham A.S.G., Ryan R.E., Tompkins S.,

 Fuente: Astrophysical Journal, 2023, 955(91)

Editorial: Institute of Physics Publishing

 Año de publicación: 2023

Nº de páginas: 21

Tipo de publicación: Artículo de Revista

 DOI: 10.3847/1538-4357/aceb4a

ISSN: 0004-637X,1538-4357

Url de la publicación: https://doi.org/10.3847/1538-4357/aceb4a

Autoría

KAMIENESKI, PATRICK S.

FRYE, BRENDA L.

PASCALE, MASSIMO

COHEN, SETH H.

WINDHORST, ROGIER A.

JANSEN, ROLF A.

YUN, MIN S.

CHENG, CHENG

SUMMERS, JAKE S.

CARLETON, TIMOTHY

HARRINGTON, KEVIN C.

YAN, HAOJING

KOEKEMOER, ANTON M.

WILLMER, CHRISTOPHER N. A.

PETRIC, ANDREEA

FURTAK, LUKAS J.

FOO, NICHOLAS

CONSELICE, CHRISTOPHER J.