THE VIRUS-P EXPLORATION OF NEARBY GALAXIES (VENGA): SURVEY DESIGN, DATA PROCESSING, AND SPECTRAL ANALYSIS METHODS
THE VIRUS-P EXPLORATION OF NEARBY GALAXIES (VENGA): SURVEY DESIGN, DATA PROCESSING, AND SPECTRAL ANALYSIS METHODS
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DOI：
10.1088/0004-6256/145/5/138
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发表时间：
2013-03
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通讯作者：
G. Blanc;T. Weinzirl;Mimi Song;A. Heiderman;K. Gebhardt;S. Jogee;N. Evans;R. V. D. van den Bosch-R.-V.-D.-van-den-Bo
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作者：
G. Blanc;T. Weinzirl;Mimi Song;A. Heiderman;K. Gebhardt;S. Jogee;N. Evans;R. V. D. van den Bosch-R.-V.-D.-van-den-Bo
我们提出的调查设计，数据处理，和光谱拟合管道的VIRUS-P勘探附近的Galeries（VENGA）。VENGA是一个积分场光谱巡天，它绘制了附近30个螺旋星系的盘。目标在哈勃类型、星星形成活动、形态和倾角方面跨越了很大的范围。VENGA数据立方体具有5.“6 FWHM空间分辨率，105 FWHM光谱分辨率，采样范围为3600 nm-6800 nm，并覆盖大面积，通常采样星系为10.7R25。这些数据立方体可用于绘制二维图，显示星星形成率、尘埃消光、电子密度、恒星种群参数、恒星和电离气体的运动学和化学丰度，以及从拟合恒星光谱和测量星云发射线中得出的其他物理量。为了验证我们的方法和数据的质量，我们展示了面对Sc星系NGC 628（又名NGC 628）的VENGA数据立方体。M 74）。本文介绍了NGC 628的VENGA观测，数据立方体的构造，光谱拟合方法，以及恒星和电离气体速度场的拟合。我们还提出了一种新的方法来测量倾斜的近面对面系统的基础上匹配的恒星和气体的旋转曲线，使用不对称漂移校正。VENGA将测量这些星系内不同环境中的相关物理参数，从而可以对大质量盘星系中的星星形成、结构组装、恒星种群、化学演化、星系反馈、核活动以及星际介质的性质进行一系列研究。
We present the survey design, data reduction, and spectral fitting pipeline for the VIRUS-P Exploration of Nearby Galaxies (VENGA). VENGA is an integral field spectroscopic survey, which maps the disks of 30 nearby spiral galaxies. Targets span a wide range in Hubble type, star formation activity, morphology, and inclination. The VENGA data cubes have 5.″6 FWHM spatial resolution, ∼5 Å FWHM spectral resolution, sample the 3600 Å–6800 Å range, and cover large areas typically sampling galaxies out to ∼0.7R25. These data cubes can be used to produce two-dimensional maps of the star formation rate, dust extinction, electron density, stellar population parameters, the kinematics and chemical abundances of both stars and ionized gas, and other physical quantities derived from the fitting of the stellar spectrum and the measurement of nebular emission lines. To exemplify our methods and the quality of the data, we present the VENGA data cube on the face-on Sc galaxy NGC 628 (a.k.a. M 74). The VENGA observations of NGC 628 are described, as well as the construction of the data cube, our spectral fitting method, and the fitting of the stellar and ionized gas velocity fields. We also propose a new method to measure the inclination of nearly face-on systems based on the matching of the stellar and gas rotation curves using asymmetric drift corrections. VENGA will measure relevant physical parameters across different environments within these galaxies, allowing a series of studies on star formation, structure assembly, stellar populations, chemical evolution, galactic feedback, nuclear activity, and the properties of the interstellar medium in massive disk galaxies.