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Comprehensive JWST+ALMA Study on the Extended Ly$\alpha$ Emitters, Himiko and CR7 at $z\sim 7$: Blue Major Merger Systems in Stark Contrast to Submillimeter Galaxies by Kiyota, Tomokazu; Ouchi, Masami; Xu, Yi; Nakazato, Yurina; Soga, Kenta; Yajima, Hidenobu; Fujimoto, Seiji; Harikane, Yuichi; Nakajima, Kimihiko; Ono, Yoshiaki; Sun, Dongsheng; Kusakabe, Haruka; Ceverino, Daniel; Hatsukade, Bunyo; Iono, Daisuke; Kohno, Kotaro; Nakanishi, Koichiro is a scholarly article available to read on EtoBox.

What is Comprehensive JWST+ALMA Study on the Extended Ly$\alpha$ Emitters, Himiko and CR7 at $z\sim 7$: Blue Major Merger Systems in Stark Contrast to Submillimeter Galaxies about?

We present various properties of two bright extended Ly$\alpha$ objects, Himiko and CR7, at $z=6.6$ thoroughly investigated with JWST/NIRCam photometry, NIRSpec-IFU spectroscopy, and ALMA data, uncovering their physical origins. Himiko (CR7) shows at least five (four) clumps with small separations of 2.4--7.3 kpc and velocity offsets of $\Delta v<220~\mathrm{km~s^{-1}}$ in the [OIII]$\lambda\lambda4959,5007$ line maps, three of which exhibit stellar components with comparable stellar masses ranging in $\log{(M_*/M_\odot)}=8.4$--$9.0$ ($8.3$--$8.8$), indicative of major merger systems that are consistent with our numerical simulations. The [CII]158$\mu$m and Ly$\alpha$ lines are found in the middle of two clumps (the brightest clump) in Himiko (CR7), suggesting that the distribution of neutral gas does not always coincide with that of ionized gas or stars in merging processes. We find that some of the clumps have broad [OIII] components (250--400$~\mathrm{km~s^{-1}}$) in Himiko and CR7, likely tracing outflow and tidal features, while the central clump in Himiko presents a broad H$\alpha$ ($\sim1000~\mathrm{km~s^{-1}}$) line explained by an AGN with a low mass black hole of $M_\math

Author

Kiyota, Tomokazu; Ouchi, Masami; Xu, Yi; Nakazato, Yurina; Soga, Kenta; Yajima, Hidenobu; Fujimoto, Seiji; Harikane, Yuichi; Nakajima, Kimihiko; Ono, Yoshiaki; Sun, Dongsheng; Kusakabe, Haruka; Ceverino, Daniel; Hatsukade, Bunyo; Iono, Daisuke; Kohno, Kotaro; Nakanishi, Koichiro

Published

2025

Language

EN