DIISC巡天：解密星际介质、恒星与星系周介质之间的相互作用巡天
DIISC Survey: Deciphering the Interplay Between the Interstellar Medium, Stars, and the Circumgalactic Medium Survey
AI总结：
DIISC巡天通过多波段观测34个低红移星系，发现莱曼α等值宽度与HI半径归一化碰撞参数强反相关，表明星系周介质中性气体分布与星系气体盘紧密相连。
摘要：
我们介绍了“解密星际介质、恒星与星系周介质之间的相互作用”（DIISC）巡天。该巡天旨在研究星系周介质（CGM）、星际介质（ISM）、恒星分布以及年轻恒星形成区域之间性质的相关性。所选的星系均具有一条位于HI半径3.5倍以内的类星体视线，用以探测盘-星系周介质界面。样本包含34个低红移星系，其恒星质量中值为10^10.45太阳质量，探测的中值碰撞参数为ρ=55千秒差距。该巡天结合了哈勃空间望远镜上宇宙起源光谱仪获得的紫外光谱数据、甚大阵列（VLA）获得的HI 21厘米超精细跃迁成像、星系演化探测器（GALEX）获得的紫外成像，以及MMT和梵蒂冈先进技术望远镜获得的光学成像和光谱数据。我们描述了巡天的具体目标、数据处理、高级数据产品以及一些早期结果。我们发现了莱曼α等值宽度W_Lyα与由HI半径归一化的碰撞参数（ρ/R_HI）之间存在强反相关关系，置信水平为99.99%。我们发现ρ/R_HI是比由维里半径归一化的碰撞参数（ρ/R_vir）或结合ρ、R_vir、恒星质量和恒星形成率的参数化更好的莱曼α等值宽度的经验预测因子。我们得出结论，莱曼α等值宽度与ρ/R_HI之间的强反相关表明，CGM的中性气体分布与星系的气体盘联系更紧密，而非其恒星和暗物质含量。
英文摘要：
We present the Deciphering the Interplay between the Interstellar medium, Stars, and the Circumgalactic medium (DIISC) Survey. This survey is designed to investigate the correlations in properties between the circumgalactic medium (CGM), the interstellar medium (ISM), stellar distributions, and young star-forming regions. The galaxies were chosen to have a QSO sightline within 3.5 times the HI radii probing the disk-CGM interface. The sample contains 34 low-redshift galaxies with a median stellar mass of 10$^{10.45}~\rm M_{\odot}$ probed at a median impact parameter of $ρ=55~kpc$. The survey combines ultraviolet spectroscopic data from the Cosmic Origins Spectrograph aboard the Hubble Space Telescope with HI 21 cm hyperfine transition imaging with the Very Large Array (VLA), ultraviolet imaging from Galaxy Evolution Explorer (GALEX), and optical imaging and spectroscopy with the MMT and Vatican Advanced Technology Telescope. We describe the specific goals of the survey, data reduction, high-level data products, and some early results. We present the discovery of a strong inverse correlation, at a confidence level of 99.99%, between Lyman $α$ equivalent width, $\rm W_{Lyα}$, and impact parameter normalized by the HI radius ($ρ/R_{HI}$). We find $ρ/R_{HI}$ to be a better empirical predictor of Lyman $α$ equivalent width than virial radius normalized impact parameter ($ρ/R_{vir}$) or parameterizations combining $ρ,~R_{vir}$, stellar mass, and star formation rate. We conclude that the strong anticorrelation between the Lyman $α$ equivalent width and $ρ/R_{HI}$ indicates that the neutral gas distribution of the CGM is more closely connected to the galaxy's gas disk rather than its stellar and dark matter content.
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