论文标题
极限金属缺陷的星系HSC HSC J1631+4426的光谱学：强线方法的测试
Optical spectroscopy of the extremely metal-deficient star-forming galaxy HSC J1631+4426: a test of the strong-line method
论文作者
论文摘要
最近，小岛和合着者报道了低氧气的氧气丰度创纪录的，低质量的星系HSC HSC J1631+4426中的12+徽标/H = 6.90 +/- 0.03。使用[OIII] 4363发射线获得了这种异常低的氧丰度。但是，使用Izotov等人的强线方法。 （2019b），这些作者的金属度12+徽标/h = 7.175 +/- 0.005。为了澄清情况，我们已经获得了HSC J1631+4426的新观察结果，该观察结果具有大型双眼望远镜（LBT）/多对象双光谱仪（MODS）。使用直接方法，我们得出了较高的氧丰度，12+徽标/H = 7.14 +/- 0.03，一个类似于强线方法获得的氧丰度。因此，HSC J1631+4426的金属性接近众所周知的蓝色紧凑型星系IZW18。
Recently, Kojima and co-authors have reported a record low oxygen abundance, 12+logO/H=6.90+/-0.03 in the low-mass star-forming galaxy HSC J1631+4426. This exceptionally low oxygen abundance was obtained by the direct method, using the [OIII]4363 emission line. However, using the strong-line method by Izotov et al. (2019b), these authors have derived a significantly higher metallicity 12+logO/H=7.175+/-0.005. To clarify the situation, we have obtained new observations of HSC J1631+4426 with the Large Binocular Telescope (LBT)/Multi-Object Dual Spectrograph (MODS). We have derived a higher oxygen abundance, 12+logO/H=7.14+/-0.03, using the direct method, a value similar to the oxygen abundance obtained by the strong-line method. Thus, HSC J1631+4426 has a metallicity close to that of the well known blue compact dwarf galaxy IZw18.
