极贫金属矮星系HIPASS J1131-31
Peekaboo: the extremely metal poor dwarf galaxy HIPASS J1131-31
摘要：
矮不规则星系HIPASS J1131-31被发现是一个低红移的HI发射源，它与一颗明亮的恒星非常接近，我们称之为“躲猫猫”。这个星系在哈勃太空望远镜的图像中被分解成恒星，导致距离估计为6.8+-0.7 Mpc。南部非洲大型望远镜的光谱光学观测显示HIPASS J1131-31是已知最极端贫金属的星系之一，其气相氧丰度为12+log（O/H）= 6.99+-0.16 dex（通过直接[OIII] 4363线方法）和6.87+-0.07 dex（通过两种强线经验方法）。该系统的红巨星分支与颜色星等图中年轻群体的突出特征相比是脆弱的，这引发了星系中恒星形成仅在最后几个Gyr开始的猜测。
英文摘要：
The dwarf irregular galaxy HIPASS J1131-31 was discovered as a source of HI emission at low redshift in such close proximity of a bright star that we call it Peekaboo. The galaxy resolves into stars in images with Hubble Space Telescope, leading to a distance estimate of 6.8+-0.7 Mpc. Spectral optical observations with the Southern African Large Telescope reveal HIPASS J1131-31 to be one of the most extremely metal-poor galaxies known with the gas-phase oxygen abundance 12+log(O/H) = 6.99+-0.16 dex via the direct [OIII] 4363 line method and 6.87+-0.07 dex from the two strong line empirical methods. The red giant branch of the system is tenuous compared with the prominence of the features of young populations in the color-magnitude diagram, inviting speculation that star formation in the galaxy only began in the last few Gyr.
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