Metal Abundances of KISS Galaxies. IV. Galaxian Luminosity-Metallicity Relations in the Optical and Near-Infrared
Metal Abundances of KISS Galaxies. IV. Galaxian Luminosity-Metallicity Relations in the Optical and Near-Infrared
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DOI：
10.1086/429386
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发表时间：
2005-02
期刊：
影响因子：
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通讯作者：
J. Salzer;Janice C. Lee;J. Melbourne;J. Hinz;A. Alonso-Herrero;A. Jangren
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文献类型：
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作者：
J. Salzer;Janice C. Lee;J. Melbourne;J. Hinz;A. Alonso-Herrero;A. Jangren
我们利用基特峰国家天文台（KPNO）国际光谱调查（KISS）的光学光度和光谱观测以及两微米全天空调查（2MASS）的近红外光度测量相结合的方法，探索了光学和近红外（NIR）中星系的光度-金属丰度（L-Z）关系。我们用我们自己的近红外光度测量法来补充2MASS数据，这些数据是2MASS数据库中代表性不足的少数低光度发射线星系（ELGs）。我们的b波段L-Z关系包括765个恒星形成的KISS星系，从我们的后续光谱中得到粗略的丰度估计，而与KISS和2MASS的相关性在我们的j波段L-Z关系中总共产生420个星系。我们探讨了改变强线丰度诊断R23与金属丰度的相关性对推导出的L-Z关系的影响。我们发现L-Z关系的斜率随着光度带通波长的增加而减小。我们将其解释为，至少部分地，是宿主星系内部吸收的影响。此外，在近红外波段，L-Z关系中的色散减小，表明内部吸收的变化对观测到的散射有重要贡献。我们提出，我们的近红外L-Z关系比b波段关系更基本，因为它们在很大程度上不受吸收效应的影响，而且近红外光度比光学光度与星系的恒星质量更直接相关。
We explore the galaxian luminosity-metallicity (L-Z) relationship in both the optical and the near-infrared (NIR) using a combination of optical photometric and spectroscopic observations from the Kitt Peak National Observatory (KPNO) International Spectroscopic Survey (KISS) and NIR photometry from the Two Micron All Sky Survey (2MASS). We supplement the 2MASS data with our own NIR photometry for a small number of lower luminosity emission-line galaxies (ELGs) that are underrepresented in the 2MASS database. Our B-band L-Z relationship includes 765 star-forming KISS galaxies with coarse abundance estimates from our follow-up spectra, while the correlation with KISS and 2MASS yields a total of 420 galaxies in our J-band L-Z relationship. We explore the effect that changing the correlation between the strong-line abundance diagnostic R23 and metallicity has on the derived L-Z relation. We find that the slope of the L-Z relationship decreases as the wavelength of the luminosity bandpass increases. We interpret this as being, at least in part, an effect of internal absorption in the host galaxy. Furthermore, the dispersion in the L-Z relation decreases for the NIR bands, suggesting that variations in internal absorption contribute significantly to the observed scatter. We propose that our NIR L-Z relations are more fundamental than the B-band relation, since they are largely free of absorption effects and the NIR luminosities are more directly related to the stellar mass of the galaxy than are the optical luminosities.