ALMAGAL: ALMA银河系大质量原星团形成演化研究数据

本数据集是ALMA大型项目ALMA银河系大质量原星团形成演化研究（简称ALMAGAL，项目号: 2019.1.00195.L）的数据。ALMAGAL旨在以相似的线性分辨率观测1000多个质量大于500太阳质量、距离小于7.5千秒差距的致密团块的1毫米连续谱和谱线。样本涵盖了从银河系棒状结构顶端到银河系外围的所有演化阶段，从红外暗云到HII区。0.1毫央斯基的灵敏度设置将能够在全银河系范围内完整研究团块到核心的碎裂过程，分辨率至少达到1000天文单位和0.3太阳质量，绘制承载核心的团块的温度和局部/全局内落速度模式图。主要数据类型包括：辅助数据（校准表、脚本、日志和质量保证报告）、产品数据（科学目标和校准源的FITS产品）、原始数据（用于制作最终产品的未校准原始数据）、半合格原始数据（未使用的有缺陷或不完整的未校准原始数据）和外部数据（外部贡献的数据产品）。主要的科学数据产品包括主波束校正的聚合干涉仪连续谱图像（product/_scicontpbcor.fits）、主波束校正且连续谱减除的干涉仪谱线数据立方体（product/_scicubepbcor.fits）以及单天线图像（product/*sd.im.fits）。QA目录下提供了质量报告，包括QA2数据质量评估报告及原始数据校准指南（*.qa2_report.{pdf,html}）以及数据校准和成像诊断表格及图表（*.weblog.tgz）。更多附加数据产品的描述详见readme文件。

This dataset contains data from the ALMA Large Program *ALMA Galactic Massive Proto-cluster Formation and Evolution Study* (abbreviated as ALMAGAL, project ID: 2019.1.00195.L). ALMAGAL aims to observe the 1-mm continuum and spectral lines of over 1000 dense clumps with masses greater than 500 solar masses and distances less than 7.5 kpc using uniform linear resolution. The sample covers all evolutionary stages from infrared dark clouds to H II regions, spanning from the tips of the Galactic bar to the Galactic outer disk. The 0.1 mJy sensitivity setting enables a complete study of the fragmentation process from clumps to cores across the entire Milky Way galaxy, with a spatial resolution of at least 1000 AU and a mass sensitivity of 0.3 solar masses, and will produce maps of temperature and local/global infall velocity patterns for clumps hosting cores. The main data categories include: auxiliary data (calibration tables, scripts, logs, and quality assurance reports), processed data products (FITS-format products for science targets and calibrators), raw data (uncalibrated raw data used to generate final products), marginally-qualified raw data (unused, defective or incomplete uncalibrated raw data), and external data (externally contributed data products). The key scientific data products include: primary-beam-corrected synthesized interferometer continuum images (product/_scicontpbcor.fits), primary-beam-corrected and continuum-subtracted interferometric spectral line data cubes (product/_scicubepbcor.fits), and single-dish images (product/*sd.im.fits). Quality reports are provided in the QA directory, including QA2 data quality assessment reports and raw data calibration guides (*.qa2_report.{pdf,html}), as well as data calibration and imaging diagnostic tables and plots (*.weblog.tgz). Descriptions of additional data products can be found in the accompanying README file.

搜集汇总

背景与挑战

背景概述

该数据集来自ALMA大型项目ALMAGAL，旨在以高灵敏度（0.1毫央斯基）和分辨率（至少1000天文单位）观测银河系内1000多个大质量致密团块的1毫米连续谱和谱线，覆盖从红外暗云到HII区的全演化阶段，用于研究团块碎裂和物理特性。数据包括连续谱图像、谱线数据立方体等多种产品，总数据量达25.00 TB，适用于大质量原星团形成演化的研究。