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A Comprehensive Study on Galaxies at z~9-16 Found in the Early JWST Data: UV Luminosity Functions and Cosmic Star-Formation History at the Pre-Reionization Epoch by Harikane, Yuichi; Ouchi, Masami; Oguri, Masamune; Ono, Yoshiaki; Nakajima, Kimihiko; Isobe, Yuki; Umeda, Hiroya; Mawatari, Ken; Zhang, Yechi is a scholarly article available to read on EtoBox.

What is A Comprehensive Study on Galaxies at z~9-16 Found in the Early JWST Data: UV Luminosity Functions and Cosmic Star-Formation History at the Pre-Reionization Epoch about?

We conduct a comprehensive study on dropout galaxy candidates at $z\sim9-16$ using the first 90 arcmin$^2$ JWST/NIRCam images taken by the early release observations (ERO) and early release science (ERS) programs. With the JWST simulation images, we find that a number of foreground interlopers are selected with a weak photo-$z$ determination ($\Delta\chi^2>4$). We thus carefully apply a secure photo-$z$ selection criterion ($\Delta\chi^2>9$) and conventional color criteria with confirmations of the ERO NIRSpec spectroscopic redshifts, and obtain a total of 23 dropout galaxies at $z\sim9-16$, including two candidates at $z_\mathrm{phot}=16.25_{-0.46}^{+0.24}$ and $16.41_{-0.55}^{+0.66}$. We perform thorough comparisons of dropout galaxies found in our work with recent JWST studies, and conclude that our galaxy sample is reliable enough for statistical analyses. We derive the UV luminosity functions at $z\sim9-16$, and confirm that our UV luminosity functions at $z\sim 9$ and $12$ agree with those determined by other HST and JWST studies. The cosmic star-formation rate density decreases from $z\sim9$ to $12$, and perhaps to $16$, but the densities at $z\sim12-16$ are higher than the

Author

Harikane, Yuichi; Ouchi, Masami; Oguri, Masamune; Ono, Yoshiaki; Nakajima, Kimihiko; Isobe, Yuki; Umeda, Hiroya; Mawatari, Ken; Zhang, Yechi

Published

2022

Language

EN