论文标题
揭开Minkowski对象中神秘的ISM条件
Unravelling the enigmatic ISM conditions in Minkowski's Object
论文作者
论文摘要
喷气引起的恒星形成的局部例子为其在银河发展中的意义提供了宝贵的见解，并可以为正面反馈的理论模型提供重要的观察性约束。使用光学积分田间光谱法，我们对Minkowski对象（$ z = 0.0189 $）中的ISM条件进行了分析，这是一个特殊的星形型矮人的星系，位于Galaxy NGC 541的无线电飞机路径中，与PPXF完全拟合了PPXF，Miminkowski $ yirm My noungry My nounger cossist a n younger consell a n youngry consist a a a n youngry consell as a n younger cossist a a a a a n younger cossist a a a a a n a n a证实该物体的大部分恒星质量是在最近的喷气相互作用中形成的。 Minkowski的对象表现出与恒星形成一致的线比，尽管有证据表明从非星状电离来源的污染水平较低（$ \ lessim 15％）。强线诊断能显示物体内气相金属性的显着变化，$ \ log \ left（\ rm o / h \ right） + 12 $ + 12 $通过$ \ sim 0.5 $ dex变化，无法通过静坐星形成，这是从喷气机中流出的，或ngc 541 ngc 541 and n gc ing of situ star fromplofe and intu star from froum fromply in n n gc and n gc and n gc ing of ing ing ing op for。 We hypothesise that Minkowski's Object either (a) was formed as a result of jet-induced star formation in pre-existing gas clumps in the stellar bridge, or (b) is a gas-rich dwarf galaxy that is experiencing an elevation in its star formation rate due to a jet interaction, and will eventually redden and fade, becoming an ultra-diffuse galaxy as it is processed by the cluster.
Local examples of jet-induced star formation lend valuable insight into its significance in galaxy evolution and can provide important observational constraints for theoretical models of positive feedback. Using optical integral field spectroscopy, we present an analysis of the ISM conditions in Minkowski's Object ($z = 0.0189$), a peculiar star-forming dwarf galaxy located in the path of a radio jet from the galaxy NGC 541. Full spectral fitting with PPXF indicates that Minkowski's Object primarily consists of a young stellar population $\sim 10$ Myr old, confirming that the bulk of the object's stellar mass formed during a recent jet interaction. Minkowski's Object exhibits line ratios largely consistent with star formation, although there is evidence for a low level ($\lesssim 15$ per cent) of contamination from a non-stellar ionising source. Strong-line diagnostics reveal a significant variation in the gas-phase metallicity within the object, with $\log\left( \rm O / H \right) + 12$ varying by $\sim 0.5$ dex, which cannot be explained by in-situ star formation, an enriched outflow from the jet, or enrichment of gas in the stellar bridge between NGC 541 and NGC 545/547. We hypothesise that Minkowski's Object either (a) was formed as a result of jet-induced star formation in pre-existing gas clumps in the stellar bridge, or (b) is a gas-rich dwarf galaxy that is experiencing an elevation in its star formation rate due to a jet interaction, and will eventually redden and fade, becoming an ultra-diffuse galaxy as it is processed by the cluster.
