论文标题
目标-JWST：隐藏的星形形成和发光红外Galaxy VV 114中的PAH排放
GOALS-JWST: Hidden Star Formation and Extended PAH Emission in the Luminous Infrared Galaxy VV 114
论文作者
论文摘要
詹姆斯·韦伯（James Webb）太空望远镜（JWST）中红外仪器（MIRI）的发光红外（IR）Galaxy VV 114的图像。这种红移〜0.020合并具有富含光星簇的西部成分（VV 114W），而东部组件（VV 114E）含有一个发光的MID-IR核，该核构成了尘埃泳道的紫外线和光学波长。使用MIRI，VV 114E核主要分解成630 PC的明亮NE和SW核。该核占VV 114的15UM光的45％，NE和SW核具有IR亮度，l_ ir（8-1000UM）〜8 +/- 0.8x10^10 l_sun和〜5 +/- 0.5x10^10 l_sun，以及IR密度，sigma_ir> 〜2+/0.2+/kp 〜2+/kp 〜2 l_sun/ 7 +/- 0.7x10^12 l_sun / kpc^2分别在猎户座星形核心的Sigma_ir范围内和ARP 220的核。相比之下，VV 114E SW具有类似AGN的颜色。确定了大约40个用L_IR 〜0.02-5x10^10 l_sun的星形结，其中25％没有光学对应物。最后，弥漫性排放占中型IR排放的40-60％。主要是，值得注意的是，丝状多环芳族烃（PAH）发射由UV随机激发，光光子占VV 114的7.7UM光的一半。这项研究说明了JWST检测到当地世界中最极端的Starburst Galaxies中发现掩盖的紧凑型活动和分布的PAH发射的能力。
James Webb Space Telescope (JWST) Mid-InfraRed Instrument (MIRI) images of the luminous infrared (IR) galaxy VV 114 are presented. This redshift ~ 0.020 merger has a western component (VV 114W) rich in optical star clusters and an eastern component (VV 114E) hosting a luminous mid-IR nucleus hidden at UV and optical wavelengths by dust lanes. With MIRI, the VV 114E nucleus resolves primarily into bright NE and SW cores separated by 630 pc. This nucleus comprises 45% of the 15um light of VV 114, with the NE and SW cores having IR luminosities, L_ IR (8-1000um) ~ 8+/-0.8x10^10 L_sun and ~ 5+/-0.5x10^10 L_sun, respectively, and IR densities, Sigma_IR >~ 2+/-0.2x10^13 L_sun / kpc^2 and >~ 7+/-0.7x10^12 L_sun / kpc^2, respectively -- in the range of Sigma_IR for the Orion star-forming core and the nuclei of Arp 220. The NE core, previously speculated to have an Active Galactic Nucleus (AGN), has starburst-like mid-IR colors. In contrast, the VV 114E SW has AGN-like colors. Approximately 40 star-forming knots with L_IR ~ 0.02-5x10^10 L_sun are identified, 25% of which have no optical counterpart. Finally, diffuse emission accounts for 40-60% of the mid-IR emission. Mostly notably, filamentary Poly-cyclic Aromatic Hydrocarbon (PAH) emission stochastically excited by UV and optical photons accounts for half of the 7.7um light of VV 114. This study illustrates the ability of JWST to detect obscured compact activity and distributed PAH emission in the most extreme starburst galaxies in the local Universe.
