eROSITA-DE 巡天第一次数据发布

德国 eROSITA 联盟 (eROSITA-DE) 于2024年1月31日公开了 SRG/eROSITA 全天巡天调查 (eRASS1) 前六个月的数据，这些数据的专有权属于德国 eROSITA联盟。数据观测时间为2019 年 12 月至 2020 年 6 月，天区覆盖范围为穿过(l,b)=(0,+90);(0,-90) 和银河中心 SgrA* (l,b)=(359.94423568,-0.04616002) 的大圆，银经在359.94423568 > l > 179.94423568，天区覆盖面积约20626.5 平方度。观测的有效曝光值在不同的天区是变化的，如：在黄道附近约为 100 秒，在黄极附近则超过10,000 秒（0.6—2.3 千电子伏特能量频段）。eROSITA-DE DR1公开了 0.2—10 千电子伏特能量频段的校准事件列表、图像、曝光图、背景图和灵敏度图，以及不同能量频段的流量上限。此外，还发布了选定（明亮）目标的源光谱和光变曲线。这些数据产品按 3.6x3.6 度的独立天区进行组织。在归档文件中，产品按天区赤纬编号（DDD）命名的目录排列，其中包含按赤经编号（RRR）命名的子目录。在这些子目录中，存放着不同分析链（EXP、DET、SOU 和 UPP）的结果。EXP 包含每个波段的主要事件文件和图像，DET 包含每个波段的曝光图和源检测产品，SOU 包含源产品，而流量上限产品则在 UPP 中。请注意，源产品仅针对信噪比较高的源生成。关于数据类型更详细的描述可参考 https://erosita.mpe.mpg.de/dr1/eSASS4DR1/eSASS4DR1_ProductsDescription/products_description_dr1.html。

The German eROSITA Consortium (eROSITA-DE) released the first six months of data from the SRG/eROSITA All-Sky Survey (eRASS1) on January 31, 2024, and the data are proprietary to the German eROSITA Consortium. The data were observed from December 2019 to June 2020. The surveyed sky area covers a great circle passing through (l,b)=(0, +90); (0, -90) and the Galactic Center Sagittarius A* (SgrA*) with coordinates (l,b)=(359.94423568, -0.04616002), with Galactic longitude l ranging from 179.94423568 to 359.94423568. The total surveyed sky area is approximately 20626.5 square degrees.

The effective exposure time varies across different sky fields: approximately 100 seconds near the ecliptic, and over 10,000 seconds near the ecliptic poles, within the 0.6–2.3 keV energy band.

The eROSITA-DE Data Release 1 (DR1) provides calibration event lists, images, exposure maps, background maps, and sensitivity maps in the 0.2–10 keV energy band, as well as flux upper limits for various energy bands. Additionally, source spectra and light curves of selected (bright) targets have been released.

These data products are organized into independent sky tiles of 3.6×3.6 square degrees. Within the archive, the products are arranged in directories named by the sky field's declination number (DDD), which contain subdirectories named by their right ascension number (RRR). Within these subdirectories, the results of four different analysis pipelines (EXP, DET, SOU, and UPP) are stored. Specifically, EXP contains the primary event files and images for each band; DET contains exposure maps and source detection products for each band; SOU contains source products; and flux upper limit products are located in UPP. Note that source products are only generated for sources with high signal-to-noise ratio (SNR).

For a more detailed description of the data types, please refer to https://erosita.mpe.mpg.de/dr1/eSASS4DR1/eSASS4DR1_ProductsDescription/products_description_dr1.html.

搜集汇总

背景与挑战

背景概述

eROSITA-DE 巡天第一次数据发布（DR1）是德国eROSITA联盟公开的SRG/eROSITA全天巡天前六个月数据，覆盖银河系西半球20626.5平方度区域，曝光时间在0.6—2.3 keV能段内从约100秒到超过10000秒不等。该数据集提供校准事件列表、图像、曝光图等多种数据产品，按3.6x3.6度天区分组，总数据量为4.54 TB，包含290568个文件，适用于X射线天文学研究，涉及恒星、星系和宇宙学等领域。