SDSS-IV MaNGA：与LSB银河系$-$合并或潮汐矮星系有关的蓝莓候选者？
SDSS-IV MaNGA: Blueberry Candidates Associated with LSB Galaxies $-$ Merger or Tidal Dwarf Systems ?
摘要：
我们在这里报告我们发现的两个新的蓝莓星系使用光学IFU光谱数据从MANGA调查。这两个蓝莓被发现是紧凑的（$\leq$ $1 - 2$ kpc）星暴系统位于低表面亮度（LSB）星系的外围。我们的蓝莓在当地已知的蓝莓星系中具有最低的恒星质量$\sim$ 10 $^{5}$ M $_{\odot}$。我们发现蓝莓来源和它们相关的LSB之间有一个显著大的平均金属丰度差异（$\sim$ 0.5 dex）。此外，我们的蓝莓中的径向金属丰度梯度也不同于它们各自的LSB-这表明它们具有显着不同的金属丰度历史。这些蓝莓TDGs的生存的可能性进行了分析，根据其结构和运动学特性。我们的分析表明，尽管这两个蓝莓在内部运动中是稳定的，但它们不会在宿主星系的潮汐力中幸存下来。基于宿主LSB和蓝莓之间的速度差异，它们似乎是紧凑的，星暴系统，处于合并的高级阶段，这些LSB位于密集的环境中。我们的研究结果的影响进行了讨论。
英文摘要：
We report here our finding of two new blueberry galaxies using optical IFU spectroscopic data from the MaNGA survey. Both the blueberries are found to be compact ($\leq$ $1 - 2$ kpc) starburst systems located at the outskirts of Low Surface Brightness (LSB) galaxies. Our blueberries have the lowest stellar masses $\sim$ 10$^{5}$ M$_{\odot}$ amongst the locally known blueberry galaxies. We find a significantly large mean metallicity difference ($\sim$ 0.5 dex) between the blueberry sources and their associated LSBs. Moreover, the radial metallicity gradients in our blueberries are also different than their respective LSBs - suggesting that these had significantly different metallicity histories. The likelihood of survival of these blueberries as TDGs is analyzed based on their structural and kinematic properties. Our analysis shows that although the two blueberries are stable against internal motions, they would not have survived against the tidal force of the host galaxy. Based on the velocity difference between the host LSBs and the blueberries, it appears that they are compact, starburst systems in their advanced stage of merger with these LSBs situated in a dense environment. Implications of our findings are discussed.
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