论文标题
HII Galaxy J084220+115000中电离气体的空间分辨特性
Spatially-resolved properties of the ionized gas in the HII galaxy J084220+115000
论文作者
论文摘要
我们为金属差的HII Galaxy J084220+115000提供了一项空间分辨的光谱研究，该研究使用Megara积分单位观测值在Gran Telescopio Canarias上进行。我们使用氧，氮和氦的直接方法估算了气体金属性，并发现平均值为12+$ \ log $（o/h）= $ 8.03 \ pm $ 0.06，并且集成的电子密度和温度为$ \ sim161 $ cm $ cm $ cm $ cm $^{ - 3} $和$ \ sim15400 $ k，相应地相应。金属分布显示$δ$（O/h）= 0.72 DEX的最小值和最大值（7.69 $ \ pm $ 0.06和8.42 $ \ pm $ 0.05）的值，在矮人星形的星系中不寻常。我们得出了$ -1.51 \ pm0.05 $的集成$ \ log $（n/o）比率，发现N/O和O/H都对应于金属的主要生产。空间解析的地图表明，根据诊断线比率，气体似乎是由大型恒星照相的。在该银河系中解释Starburst活性的可能机制和氧丰度的巨大变化之间，我们的数据支持了一种可能的情况，在这种情况下，我们目睹了持续的相互作用触发多个恒星形成区域，该区域定位于两个主要团块。
We present a spatially resolved spectroscopic study for the metal poor HII galaxy J084220+115000 using MEGARA Integral Field Unit observations at the Gran Telescopio Canarias. We estimated the gas metallicity using the direct method for oxygen, nitrogen and helium and found a mean value of 12+$\log$(O/H)=$8.03\pm$0.06, and integrated electron density and temperature of $\sim161$ cm$^{-3}$ and $\sim15400$ K, respectively. The metallicity distribution shows a large range of $Δ$(O/H) = 0.72 dex between the minimum and maximum (7.69$\pm$0.06 and 8.42$\pm$0.05) values, unusual in a dwarf star-forming galaxy. We derived an integrated $\log$(N/O) ratio of $-1.51\pm0.05$ and found that both N/O and O/H correspond to a primary production of metals. Spatially resolved maps indicate that the gas appears to be photoionized by massive stars according to the diagnostic line ratios. Between the possible mechanisms to explain the starburst activity and the large variation of oxygen abundance in this galaxy, our data support a possible scenario where we are witnessing an ongoing interaction triggering multiple star-forming regions localized in two dominant clumps.
