论文标题
phangs-jwst首先结果：21 $μ$ m紧凑源人群
PHANGS-JWST First Results: The 21 $μ$m Compact Source Population
论文作者
论文摘要
我们使用Miri F2100W数据使用Phangs-JWST数据来识别和对附近四个星系中的四个星系中的1271 compact 21 $μ$ M。我们使用基于树状图的算法来识别源，并测量JWST频段的背景磁通密度从2 $ $ m至21 $μ$ m。使用JWST以及HST乐队，以及Alma和Muse/VLT观察，我们会通过眼睛对来源进行分类。然后，我们使用此分类来定义颜色空间中的区域，因此建立了用于分类源的定量框架。我们将1085个来源识别为属于目标星系的ISM，其余为尘土飞扬的恒星或背景星系。这21美元$ $ M的来源在空间上与HII区域密切相关（$> 92 \％的来源），而74美元的来源与HST数据中定义的出色关联是一致的。使用SED拟合，我们发现21 $ $ M $ M的恒星质量范围为10 $^{2} $的范围为10 $^{4} 〜M_ \ M_ \ odot $，大量加权年龄降低到2 Myr。对于$ l_ {ν，\ mathrm {f2100W}}> 10^{19}〜\ mathrm {w〜Hz}^{ - 1} $，对衰减校正的H $α$和21 $ $ m的光度之间存在密切的相关性。在此阈值以下发现了以21 $μ$ m选择的年轻嵌入式源候选者，并且具有$ m_ \ star <10^{3} 〜m_ \ odot $。
We use PHANGS-JWST data to identify and classify 1271 compact 21 $μ$m sources in four nearby galaxies using MIRI F2100W data. We identify sources using a dendrogram-based algorithm, and we measure the background-subtracted flux densities for JWST bands from 2 $μ$m to 21 $μ$m. Using the SED in JWST as well as HST bands, plus ALMA and MUSE/VLT observations, we classify the sources by eye. Then we use this classification to define regions in color-color space, and so establish a quantitative framework for classifying sources. We identify 1085 sources as belonging to the ISM of the target galaxies with the remainder being dusty stars or background galaxies. These 21 $μ$m sources are strongly spatially associated with HII regions ($>92\%$ of sources), while 74$\%$ of sources are coincident with a stellar association defined in the HST data. Using SED fitting, we find that the stellar masses of the 21 $μ$m sources span a range of 10$^{2}$ to 10$^{4}~M_\odot$ with mass-weighted ages down to 2 Myr. There is a tight correlation between attenuation-corrected H$α$ and 21 $μ$m luminosity for $L_{ν,\mathrm{F2100W}}>10^{19}~\mathrm{W~Hz}^{-1}$. Young embedded source candidates selected at 21 $μ$m are found below this threshold and have $M_\star < 10^{3}~M_\odot$.
