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arXiv 1106.4183astro-ph.CO
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邻近星系样品的积分场光谱学。I.样本、观察结果和数据简化

Integral Field Spectroscopy of a sample of nearby galaxies. I. Sample, Observations and Data Reduction

E. Marmol-Queralto, S. F. Sanchez, R. A. Marino, D. Mast, K. Viironen, A. Gil de Paz, J. Iglesias-Paramo, F. F. Rosales-Ortega, J. M. Vilchez

摘要:

目的:积分场光谱学(IFS)是研究邻近星系的一种强有力的方法,因为它可以详细分析它们的物理特性。在这里,我们提出了附近的星系选择利用IFS提供的二维信息的样本。研究方法:我们观察了一个样本的48个星系从本地宇宙的PPAK积分场光谱单元(IFU),PMAS摄谱仪,安装在3.5米望远镜在卡拉尔阿尔托天文台(阿尔梅里亚,西班牙)。在这些研究中使用了两种不同的设置(低-V300-和中-V600-分辨率模式),覆盖了约3700-7000 Angs的光谱范围。我们为数据简化开发了一个全自动管道,包括对最终数据产品质量的分析。我们应用退耦方法得到了这些星系的电离气体和恒星含量,并导出了星系的主要物理性质。为了评估不同参数测量的准确性,我们进行了一组模拟,以推导出用这些数据获得的预期相对误差。此外,我们还从数据管中提取了两个孔径,中心谱和积分谱。从这些光谱和整个数据管中导出了这些星系的恒星星族和电离气体的主要性质及其相对误差的估计。结果如下:从datacubes和SDSS光谱中提取的这些星系在共同的中心光谱的比较表明,从两个样本的派生值之间有很好的一致性。我们发现星系的属性的差异时,比较中心和综合光谱,显示提取的孔径的数据的解释的影响。最后,我们提出了一些主要的性质与解耦程序派生的二维地图。

英文摘要:

Aims: Integral Field Spectroscopy (IFS) is a powerful approach for the study of nearby galaxies since it enables a detailed analysis of their resolved physical properties. Here we present the sample of nearby galaxies selected to exploit the two dimensional information provided by the IFS. Methods: We observed a sample of 48 galaxies from the Local Universe with the PPAK Integral Field Spectroscopy unit (IFU), of the PMAS spectrograph, mounted at the 3.5m telescope at Calar Alto Observatory (Almeria, Spain). Two different setups were used during these studies (low -V300- and medium -V600- resolution mode) covering a spectral range of around 3700-7000 Angs. We developed a full automatic pipeline for the data reduction, that includes an analysis of the quality of the final data products. We applied a decoupling method to obtain the ionised gas and stellar content of these galaxies, and to derive the main physical properties of the galaxies. To asses the accuracy in the measurements of the different parameters, we performed a set of simulations to derive the expected relative errors obtained with these data. In addition, we extracted two aperture, central and integrated spectra, from the datacubes. The main properties of the stellar populations and ionised gas of these galaxies and an estimate of their relative errors are derived from those spectra, as well as from the whole datacubes. Results: The comparison of the central spectrum extracted from the datacubes and the SDSS spectrum for those galaxies in common shows a good agreement between the derived values from both samples. We find differences in the properties of galaxies when comparing a central and an integrated spectra, showing the effects of the extracted aperture in the interpretation of the data. Finally, we present two dimensional maps of some of the main properties derived with the decoupling procedure.

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