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arXiv 1902.03754astro-ph.GA
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SDSS IV MaNGA中的离群H $α$发射体

Outlying H$α$ emitters in SDSS IV MaNGA

Omkar Bait, Yogesh Wadadekar, Sudhanshu Barway

摘要:

我们已经进行了系统的搜索外围H $α$发射器在整个数据发布14斯隆数字巡天(SDSS)IV映射附近Galerkin在APO(MANGA)调查。我们在暗能量相机遗产巡天(DECaLS)的成像数据发布5和Mayall $z$波段遗产巡天(MzLS)+北京-亚利桑那巡天(BASS)的数据发布6中发现了6个外围H $α$发射体,它们没有明亮的底层光学连续谱发射。它们还显示出与宿主星系不同的速度场。在H $α$图像中,这些外围H $α$发射体都具有延伸结构。它们的发射线比率表明,它们是由于活动星系核(AGN)或AGN和恒星形成的混合物而被光电离的。它们中的一些很可能是汉尼的Voorwerp类似物体的暗淡对应物。

英文摘要:

We have carried out a systematic search for outlying H$α$ emitters in the entire data release 14 of the Sloan Digital Sky Survey (SDSS) IV Mapping Nearby Galaxies at APO (MaNGA) survey. We have discovered six outlying H$α$ emitters with no bright underlying optical continuum emission in the imaging data release 5 from the Dark Energy Camera Legacy Survey (DECaLS) and data release 6 of the Mayall $z$-band Legacy Survey (MzLS) + Beijing-Arizona Sky Survey (BASS). They also show a velocity field which is different from that of the host galaxy. These outlying H$α$ emitters all have extended structure in the H$α$ image. Their emission line ratios show that they are photoionised due to an active galactic nucleus (AGN) or a mixture of both an AGN and star formation. Some of them are very likely to be fainter counterparts of Hanny's Voorwerp like objects.

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