标题： 附近星系中超新星遗迹处的H-α发射和HII区 显示英文标题

标题： H-alpha emission and HII regions at the locations of recent supernovae in nearby galaxies

摘要： 我们对附近恒星形成星系中近期（少于125年）超新星（SNe）位置处的局部（大约50-100 pc尺度）H-alpha发射进行了统计分析。 我们的样本由PHANGS-MUSE巡天的目标星系中的10个星系内的32个超新星组成。 我们发现，其中41%（13/32）的超新星发生在之前已识别出的HII区域中。 相比之下，在距离任何近期超新星1 kpc范围内的区域，HII区域覆盖了32%的面积。 对比这一局部覆盖分数与与HII区域重合的超新星比例，我们发现所有超新星中有7.6% +/- 8.7%的统计超额与HII区域相关联。 当仅考虑核心坍缩超新星时，这一超额增加到19.2% +/- 10.4%。 这些估计似乎与来自新的更高分辨率HST H-alpha成像的定性结果一致，后者也表明许多CCSNe在HII区域附近而非内部爆炸。 我们的结果似乎符合预期，即只有少数恒星在恒星群体生命的前5百万年内爆炸，此时预计H-alpha发射会很明亮。 在与HII区域相关的超新星中，8%（11/13）也有与之相关的检测到的CO(2-1)发射，这表明存在分子气体。 与HII区域相关的超新星的典型Av消光约为1个星等，这与该区域在超新星爆炸前清除大量气体的情况一致。 显示英文摘要

摘要： We present a statistical analysis of the local, approximately 50-100 pc scale, H-alpha emission at the locations of recent (less than 125 years) supernovae (SNe) in nearby star-forming galaxies. Our sample consists of 32 SNe in 10 galaxies that are targets of the PHANGS-MUSE survey. We find that 41% (13/32) of these SNe occur coincident with a previously identified HII region. For comparison, HII regions cover 32% of the area within 1 kpc of any recent SN. Contrasting this local covering fraction with the fraction of SNe coincident with HII regions, we find a statistical excess of 7.6% +/- 8.7% of all SNe to be associated with HII regions. This increases to an excess of 19.2% +/- 10.4% when considering only core-collapse SNe. These estimates appear to be in good agreement with qualitative results from new, higher resolution HST H-alpha imaging, which also suggest many CCSNe detonate near but not in HII regions. Our results appear consistent with the expectation that only a modest fraction of stars explode during the first 5 Myr of the life of a stellar population, when H-alpha emission is expected to be bright. Of the HII region associated SNe, 8% (11/13) also have associated detected CO(2-1) emission, indicating the presence of molecular gas. The HII region associated SNe have typical Av extinctions approximately equal to 1 mag, consistent with a significant amount of pre-clearing of gas from the region before the SNe explode.