%0 Generic %1 ono2022morphologies %A Ono, Yoshiaki %A Harikane, Yuichi %A Ouchi, Masami %A Yajima, Hidenobu %A Abe, Makito %A Isobe, Yuki %A Shibuya, Takatoshi %A Zhang, Yechi %A Nakajima, Kimihiko %A Umeda, Hiroya %D 2022 %K library %T Morphologies of Galaxies at $z 9-17$ Uncovered by JWST/NIRCam Imaging: Cosmic Size Evolution and an Identification of an Extremely Compact Bright Galaxy at $z12$ %U http://arxiv.org/abs/2208.13582 %X We present morphologies of galaxies at $z\sim9-17$ resolved by JWST/NIRCam $2-5\mu$m imaging. Our sample consists of $25$ galaxy candidates identified by stringent dropout and photo-$z$ criteria in GLASS, CEERS, SMACS J0723, and Stephan's Quintet flanking fields. We perform surface brightness (SB) profile fitting with GALFIT for $6$ bright galaxies with S/N $=10-40$ on an individual basis and for stacked faint galaxies with secure point-spread functions (PSFs) of the NIRCam real data, carefully evaluating systematics by Monte-Carlo simulations. We compare our results with those of previous JWST studies, and confirm that effective radii $r_e$ of our measurements are consistent with those of previous measurements at $z9$. We obtain $r_e\simeq 200-300$ pc with the exponential-like profiles, Sérsic indexes of $n\simeq 1-1.5$, for galaxies at $z12-17$, indicating that the relation of $r_\rm e(1+z)^s$ for $s=-1.19^+0.16_-0.15$ explains cosmic evolution over $z0-17$ for $L^*_z=3$ galaxies. One bright ($M_UV=-21$ mag) galaxy at $z12$, GL-z12-1, has an extremely compact size with $r_\rm e=61 11$ pc that is surely extended over the PSF. Even in the case that the GL-z12-1 SB is fit by AGN$+$galaxy composite profiles, the best-fit galaxy component is again compact, $r_e=78^+30_-12$ pc that is significantly ($>5\sigma$) smaller than the typical $r_e$ value at $z12$. Comparing with numerical simulations, we find that such a compact galaxy naturally forms at $z10$, and that frequent mergers at the early epoch produce more extended galaxies following the $r_e(1+z)^s$ relation.

@misc{ono2022morphologies, abstract = {We present morphologies of galaxies at $z\sim9-17$ resolved by JWST/NIRCam $2-5\mu$m imaging. Our sample consists of $25$ galaxy candidates identified by stringent dropout and photo-$z$ criteria in GLASS, CEERS, SMACS J0723, and Stephan's Quintet flanking fields. We perform surface brightness (SB) profile fitting with GALFIT for $6$ bright galaxies with S/N $=10-40$ on an individual basis and for stacked faint galaxies with secure point-spread functions (PSFs) of the NIRCam real data, carefully evaluating systematics by Monte-Carlo simulations. We compare our results with those of previous JWST studies, and confirm that effective radii $r_{\rm e}$ of our measurements are consistent with those of previous measurements at $z\sim 9$. We obtain $r_{\rm e}\simeq 200-300$ pc with the exponential-like profiles, S\'ersic indexes of $n\simeq 1-1.5$, for galaxies at $z\sim 12-17$, indicating that the relation of $r_{\rm e}\propto (1+z)^s$ for $s=-1.19^{+0.16}_{-0.15}$ explains cosmic evolution over $z\sim 0-17$ for $\sim L^*_{z=3}$ galaxies. One bright ($M_{\rm UV}=-21$ mag) galaxy at $z\sim 12$, GL-z12-1, has an extremely compact size with $r_{\rm e}=61 \pm 11$ pc that is surely extended over the PSF. Even in the case that the GL-z12-1 SB is fit by AGN$+$galaxy composite profiles, the best-fit galaxy component is again compact, $r_{\rm e}=78^{+30}_{-12}$ pc that is significantly ($>5\sigma$) smaller than the typical $r_{\rm e}$ value at $z\sim 12$. Comparing with numerical simulations, we find that such a compact galaxy naturally forms at $z\gtrsim 10$, and that frequent mergers at the early epoch produce more extended galaxies following the $r_{\rm e}\propto (1+z)^s$ relation.}, added-at = {2022-08-30T09:24:44.000+0200}, author = {Ono, Yoshiaki and Harikane, Yuichi and Ouchi, Masami and Yajima, Hidenobu and Abe, Makito and Isobe, Yuki and Shibuya, Takatoshi and Zhang, Yechi and Nakajima, Kimihiko and Umeda, Hiroya}, biburl = {https://www.bibsonomy.org/bibtex/2cc559aaaad27ee637c2808ab3aadae9a/gpkulkarni}, description = {Morphologies of Galaxies at $z \simeq 9-17$ Uncovered by JWST/NIRCam Imaging: Cosmic Size Evolution and an Identification of an Extremely Compact Bright Galaxy at $z\sim 12$}, interhash = {ae957d26c0e8d1c3984ac8819a7bb244}, intrahash = {cc559aaaad27ee637c2808ab3aadae9a}, keywords = {library}, note = {cite arxiv:2208.13582Comment: 26 pages, 23 figures, submitted to ApJ}, timestamp = {2022-08-30T09:24:44.000+0200}, title = {Morphologies of Galaxies at $z \simeq 9-17$ Uncovered by JWST/NIRCam Imaging: Cosmic Size Evolution and an Identification of an Extremely Compact Bright Galaxy at $z\sim 12$}, url = {http://arxiv.org/abs/2208.13582}, year = 2022 }