We present deep, narrowband imaging of the nearby spiral galaxy M101 to search for star-forming dwarf galaxies and isolated H ii regions in the group environment. Isolated star-forming regions, unassociated with spiral arms, probe star formation (SF) at the lowest masses and environmental densities. Such objects may be isolated star-forming events or ongoing evidence of tidal interactions. Using the Burrell Schmidt telescope, we target the brightest emission lines of star-forming regions, Hα, Hβ, and [O iii], to detect potential isolated regions. Great care was taken to remove potential source contaminants, such as high-redshift objects and Galactic M stars, from our source list. For each detected source, we compare the emission line fluxes and equivalent widths, along with structural and photometric properties, to samples of Local Group dwarfs and star-forming galaxies in the SINGG/11HUGS samples. We discuss our findings in the context of SF in low-density environments and evolution of the M101 Group.

我们展示了附近螺旋星系 M101 的深度窄带成像，以在群环境中寻找恒星形成的矮星系和孤立的 H  ii区域。孤立的恒星形成区域，与旋臂无关，在最低质量和环境密度下探测恒星形成 (SF)。这些天体可能是孤立的恒星形成事件或潮汐相互作用的持续证据。使用 Burrell Schmidt 望远镜，我们瞄准了恒星形成区域最亮的发射线 H α、 H β和 [O  iii]，以检测潜在的孤立区域。我们非常小心地从我们的源列表中删除了潜在的源污染物，例如高红移天体和银河 M 星。对于每个检测到的源，我们将发射线通量和等效宽度以及结构和光度特性与 SINGG/11HUGS 样本中的本地群矮星和恒星形成星系的样本进行比较。我们在低密度环境中的 SF 和 M101 组的演变背景下讨论我们的发现。