论文标题
$ z \ gtrsim的丰度10 $ hudf中的星系候选者使用深jwst nircam中频段成像
The abundance of $z \gtrsim 10$ galaxy candidates in the HUDF using deep JWST NIRCam medium-band imaging
论文作者
论文摘要
我们利用JWST NIRCAM中频段成像来搜索Hubble Ultra Deep Field（HUDF）中的极端红移（$ Z \ geq 9.5 $）候选人，以及第二个Nircam模块提供的货物 - 南字段中的附加指数。我们的搜索显示了6名健壮的候选人，其中3个最近已通过光谱镜得到证实。这3个之一是先前有争议的$ z \ simeq 12 $ Galaxy候选UDF-22980，现在在五个JWST Nircam中频滤波器（F182m，f182m，f210m，f430m，f460m，f460m和f480m和f480m）中检测到，有效地排除了$ 11 \ pm 0.2 $。我们还以$ z \ geq 12.5 $检测到2个星系，其中包括第二个Nircam模块（HUDF的西南）在$ z = 12.6 \ pm 0.6 $的成像中新发现的候选人。我们通过将14频段的光度法与风笛拟合来确定6个星系的物理特性。我们发现$ \ log（m _ {\ star}/{\ rm {m _ {\ odot}}}}）\ simeq 7.5-8.7 $和$ \ log（\ rm {sfr}/m _ odot} { \ simeq 0.3-5.0 $。 Despite the relatively small cosmological volume covered by the HUDF itself and the second NIRCam module imaging, we find that the existence of these galaxies is fully consistent with the latest measurements of both the UV luminosity function and cosmic star-formation rate density at $z\simeq11$, supporting a gradual steady decline in the cosmic star-formation rate density out to at least $z\simeq15$.
We utilise JWST NIRCam medium-band imaging to search for extreme redshift ($z \geq 9.5$) galaxy candidates in the Hubble Ultra Deep Field (HUDF) and the additional pointing within the GOODS-South field provided by the second NIRCam module. Our search reveals 6 robust candidates, 3 of which have recently been spectroscopically confirmed. One of these 3 is the previously controversial $z \simeq 12$ galaxy candidate UDF-22980 which is now detected in five JWST NIRCam medium-band filters (F182M, F210M, F430M, F460M and F480M), efficiently excluding alternative low-redshift solutions and allowing us to now report a secure photometric redshift of $z = 11.6 \pm 0.2$. We also detect 2 galaxies at $z \geq 12.5$ including a newly-detected candidate in the imaging provided by the second NIRCam module (south-west of the HUDF) at $z = 12.6 \pm 0.6$. We determine the physical properties of the 6 galaxies by fitting the 14-band photometry with Bagpipes. We find stellar masses of $\log(M_{\star}/{\rm {M_{\odot}}}) \simeq 7.5 - 8.7$ and star-formation rates of $\log(\rm{SFR}/M_{\odot}^{-1} \rm{yr}^{-1}) \simeq 0.3 - 5.0$. Despite the relatively small cosmological volume covered by the HUDF itself and the second NIRCam module imaging, we find that the existence of these galaxies is fully consistent with the latest measurements of both the UV luminosity function and cosmic star-formation rate density at $z\simeq11$, supporting a gradual steady decline in the cosmic star-formation rate density out to at least $z\simeq15$.
