OPTICAL SPECTROSCOPY AND NEBULAR OXYGEN ABUNDANCES OF THE SPITZER/SINGS GALAXIES
OPTICAL SPECTROSCOPY AND NEBULAR OXYGEN ABUNDANCES OF THE SPITZER/SINGS GALAXIES
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DOI：
10.1088/0067-0049/190/2/233
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发表时间：
2010-07
期刊：
影响因子：
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通讯作者：
J. Moustakas;R. Kennicutt;C. Tremonti;D. Dale;John-David T. Smith;D. Calzetti
中科院分区：
文献类型：
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作者：
J. Moustakas;R. Kennicutt;C. Tremonti;D. Dale;John-David T. Smith;D. Calzetti
我们目前的中分辨率光学分光光度计的65个星系的斯皮策红外近星系巡天（SINGS）的支持。对于每个星系，我们得到一个核，环核，和半集成的光谱设计，以符合空间与中，远红外光谱从斯皮策太空望远镜。我们使减少，cavometrically校准的一维光谱，以及强星云发射线的通量和等效宽度的测量，victionally可用。我们使用光发射线比率测量的所有三个空间尺度上的样本分类成恒星形成，活动星系核（AGN），和星系的混合物的星星形成和核活动。我们发现，被归类为星星形成与活动星系核的样品的相对分数是一个强大的功能的综合光所包围的分光孔径。我们补充我们的意见与一个大型数据库的星云发射线测量的个别H II地区的SINGS星系从文献中挑选。我们使用这些辅助数据进行详细的分析的径向丰度梯度和平均H II区丰度的一个大部分的样品。我们结合联合收割机这些结果与我们的新的综合光谱，以估计所有75个星星系的中心和特征（全球平均）气相氧丰度。最后，我们深入讨论了星云氧丰度尺度的绝对不确定性。
We present intermediate-resolution optical spectrophotometry of 65 galaxies obtained in support of the Spitzer Infrared Nearby Galaxies Survey (SINGS). For each galaxy we obtain a nuclear, circumnuclear, and semi-integrated optical spectrum designed to coincide spatially with mid- and far-infrared spectroscopy from the Spitzer Space Telescope. We make the reduced, spectrophotometrically calibrated one-dimensional spectra, as well as measurements of the fluxes and equivalent widths of the strong nebular emission lines, publically available. We use optical emission-line ratios measured on all three spatial scales to classify the sample into star-forming, active galactic nuclei (AGNs), and galaxies with a mixture of star formation and nuclear activity. We find that the relative fraction of the sample classified as star forming versus AGN is a strong function of the integrated light enclosed by the spectroscopic aperture. We supplement our observations with a large database of nebular emission-line measurements of individual H ii regions in the SINGS galaxies culled from the literature. We use these ancillary data to conduct a detailed analysis of the radial abundance gradients and average H ii-region abundances of a large fraction of the sample. We combine these results with our new integrated spectra to estimate the central and characteristic (globally averaged) gas-phase oxygen abundances of all 75 SINGS galaxies. We conclude with an in-depth discussion of the absolute uncertainty in the nebular oxygen abundance scale.