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arXiv 1304.3142astro-ph.IMastro-ph.CO
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GEMINI多目标光谱仪舔指数的标定

The Lick-Index Calibration of the GEMINI Multi-Object Spectrographs

Thomas H. Puzia, Bryan W. Miller, Gelys Trancho, Brett Basarab, Jordan T. Mirocha, Karen Butler

摘要:

我们提出了校准的光谱Lick/IDS标准线指数系统获得的测量与双子座多目标光谱仪称为GMOS-北和GMOS-南。我们为B600棱镜和两种仪器设置的25个标准Lick线指数中的每一个提供线性校正函数,一种具有0.5弧秒狭缝宽度和1x 1 CCD像素合并(对应于~2.5埃光谱分辨率),另一种具有0.75弧秒狭缝宽度和2x2合并(~4埃)。我们发现小的和定义良好的校正条款的一组巴尔末指数Hbeta,HgammaA,和HdeltaA随着金属丰度敏感指数Fe 5015,Fe 5270,Fe 5335,Fe 5406,Mg 2和Mg B,被广泛用于遥远恒星系统的恒星星族诊断。我们发现其他指数,采样分子吸收带,如TiO 1和TiO 2,具有非常宽的波长覆盖范围或指数,采样非常弱的分子和原子吸收特征,如Mg 1,以及指数特别窄的通带定义,如Fe 4384,Ca 4455,Fe 4531,Ca 4227和Fe 5782,不太稳健校准。应谨慎使用这些指数。

英文摘要:

We present the calibration of the spectroscopic Lick/IDS standard line-index system for measurements obtained with the Gemini Multi-Object Spectrographs known as GMOS-North and GMOS- South. We provide linear correction functions for each of the 25 standard Lick line indices for the B600 grism and two instrumental setups, one with 0.5 arcsecond slit width and 1x1 CCD pixel binning (corresponding to ~2.5 Angstroem spectral resolution) and the other with 0.75 arcsecond slit width and 2x2 binning (~4 Angstroem). We find small and well-defined correction terms for the set of Balmer indices Hbeta, HgammaA, and HdeltaA along with the metallicity sensitive indices Fe5015, Fe5270, Fe5335, Fe5406, Mg2 and Mgb that are widely used for stellar population diagnostics of distant stellar systems. We find other indices that sample molecular absorption bands, such as TiO1 and TiO2, with very wide wavelength coverage or indices that sample very weak molecular and atomic absorption features, such as Mg1, as well as indices with particularly narrow passband definitions, such as Fe4384, Ca4455, Fe4531, Ca4227, and Fe5782, less robustly calibrated. These indices should be used with caution.

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