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引用次数: 0
摘要
我们建议利用光谱学获得的发射线光度来估计星系中中性氢的含量。我们使用了在斯隆数字巡天(SDSS)的公共DR17框架中发布的APO (MaNGA)巡天附近星系测绘(Mapping of Nearby Galaxies at APO)的光学光谱数据。我们将我们估计的SDSS/MaNGA星系大样本的HI质量与ALFALFA调查的直接HI测量结果进行了比较，发现质量之间的相关系数(CC)为0.91，对数质量的r.m.s散射指数为0.15。通过另一个用绿岸望远镜测量的具有HI质量的MaNGA星系样本，验证了所获得的关系。尽管射电数据的角分辨率较粗，但估算和直接测量的HI质量之间的关系也很紧密——在这种情况下，CC=0.74和r.nms。是0.29指数。建立的关系式使我们能够简单而有效地从光谱观测中估计出星系中中性氢的总质量和HI表面密度的空间分布。
The Neutral Hydrogen Mass in Galaxies Estimated via Optical Spectroscopy
We propose to employ emission line luminosities obtained via optical spectroscopy to estimate the content of neutral hydrogen (HI) in galaxies. We use the optical spectroscopy data from the Mapping of Nearby Galaxies at APO (MaNGA) survey released in the frames of public DR17 of the Sloan Digital Sky Survey (SDSS). We compare the HI mass estimated by us for a large sample of SDSS/MaNGA galaxies with direct HI measurements from the ALFALFA survey and find a tight correlation between the masses with the correlation coefficient (CC) of 0.91 and the r.m.s scatter of 0.15 dex for the logarithmic mass. The obtained relationship is verified via another sample of MaNGA galaxies with HI masses measured with the Green Bank Telescope. Despite the coarser angular resolution of the radio data, the relation between the estimated and measured directly HI mass is tight as well - in this case CC=0.74 and the r.nm.s. is 0.29 dex. The established relations allow us to estimate the total mass of neutral hydrogen as well as the spatial distribution of HI surface density in galaxies from optical spectroscopic observations only in a simple and efficient way.
期刊介绍：
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