论文标题
使用新的JWST NIRCAM中型观测值HUDF/XDF的新JWST NIRCAM中型观测，UV LF从Z〜15到Z〜8的演变
Evolution of the UV LF from z~15 to z~8 Using New JWST NIRCam Medium-Band Observations over the HUDF/XDF
论文作者
论文摘要
我们介绍了在Hubble Ultra Deep Field（HUDF）中利用JEMS的新NIRCAM观测值的Z> 10星系流行的第一个限制（JWST外层次中型中频段调查）。这些NIRCAM观测值探测为1.6 $ $ M的红向红色，超出HST的波长极限，从而使我们可以搜索星系至z> 10。这些观察结果表明，与HST，UDFJ-39546284在HUDF09数据中鉴定出的最高红移候选者的红移为z> 11.5，正如HUDF12/XDF数据的分析中所建议的那样。现在已经用JWST NIRSPEC确认了这一点。因此，该来源是HST在运营> 30年中发现的最遥远的星系。此外，我们在HUDF上确定了九个其他Z〜8-13候选星系，其中两个是似乎位于Z〜11-12的新发现。我们使用这些结果来表征UV光度函数（LF）从Z〜15到Z〜8.7的演变。虽然我们的LF结果在Z〜8.7和Z〜10.5与HUDF的先前发现一致，但我们在Z〜12.6时的新LF估计值高于文献中的其他结果，可能指出Z〜12.6的UV亮度密度的较轻演化。我们强调的是，鉴于Z〜12.6的数量少量和有限的体积探测，我们的LF结果尚不确定。新的NIRCAM数据还表明，HUDF/XDF中微弱的Z〜8-13星系显示蓝色UV-Continuum倾斜β〜-2.7，高特异性星形形成率〜24.5 gyr ** -1，高EW（〜1300A）[OIII]+H $β$ 8.5 $β$ aby $β$ ii $ ii y [OII] A
We present the first constraints on the prevalence of z>10 galaxies in the Hubble Ultra Deep Field (HUDF) leveraging new NIRCam observations from JEMS (JWST Extragalactic Medium-band Survey). These NIRCam observations probe redward of 1.6$μ$m, beyond the wavelength limit of HST, allowing us to search for galaxies to z>10. These observations indicate that the highest redshift candidate identified in the HUDF09 data with HST, UDFj-39546284, has a redshift of z>11.5, as had been suggested in analyses of the HUDF12/XDF data. This has now been confirmed with JWST NIRSpec. This source is thus the most distant galaxy discovered by HST in its >30 years of operation. Additionally, we identify nine other z~8-13 candidate galaxies over the HUDF, two of which are new discoveries that appear to lie at z~11-12. We use these results to characterize the evolution of the UV luminosity function (LF) from z~15 to z~8.7. While our LF results at z~8.7 and z~10.5 are consistent with previous findings over the HUDF, our new LF estimates at z~12.6 are higher than other results in the literature, potentially pointing to a milder evolution in the UV luminosity density from z~12.6. We emphasize that our LF results are uncertain given the small number of z~12.6 sources and limited volume probed. The new NIRCam data also indicate that the faint z~8-13 galaxies in the HUDF/XDF show blue UV-continuum slopes beta~-2.7, high specific star formation rates ~24.5 Gyr**-1, and high EW (~1300A) [OIII]+H$β$ emission, with two z~8.5 sources showing [OIII]+H$β$ EWs of ~2300 A.
