The eROSITA Final Equatorial-Depth Survey (eFEDS): Identification and characterization of the counterparts to the point-like sources
M. Salvato, J. Wolf, T. Dwelly, A. Georgakakis, M. Brusa, A. Merloni, T. Liu, Y. Toba, K. Nandra, G. Lamer, J. Buchner, C. Schneider, S. Freund, A. Rau, A. Schw… 展开作者
M. Salvato, J. Wolf, T. Dwelly, A. Georgakakis, M. Brusa, A. Merloni, T. Liu, Y. Toba, K. Nandra, G. Lamer, J. Buchner, C. Schneider, S. Freund, A. Rau, A. Schwope, A. Nishizawa, M. Klein, R. Arcodia, J. Comparat, B. Musiimenta, T. Nagao, H. Brunner, A. Malyali, A. Finoguenov, S. Anderson, Y. Shen, H. Ibarra-Mendel, J. Trump, W. N. Brandt, C. M. Urry, C. Rivera, M. Krumpe, T. Urrutia, T. Miyaji, K. Ichikawa, D. P. Schneider, A. Fresco, J. Wilms, T. Boller, J. Haase, J. Brownstein, R. R. Lane, D. Bizyaev, C. Nitschelm
备注：
Accepted by A&A for the Special Issue: The Early Data Release of eROSITA and Mikhail Pavlinsky ART-XC on the SRG Mission. NOTE: Paper completely revised wrt the first version submitted to arXiv. Revised catalogs available via https://erosita.mpe.mpg.de/edr/eROSITAObservations/Catalogues/
2019年11月，SRG天文台上的eROSITA开始用X射线绘制整个天空。在4年的调查方案之后，它将达到比ROSAT深25倍的通量极限。在SRG性能验证阶段，eROSITA观测了天空中连续140度的$^2$区域，一直到eROSITA全天空巡天（“eROSITA最终赤道深度巡天”：eFEDS）的最终深度，目的是对整个天空中将要发现的X射线发射群（恒星、致密天体、星系、星系团、活动星系核）进行普查。本文介绍了在Brunner等人2021年描述的主样品和硬样品中，在eFEDS中检测到的点源的对应物的识别，以及它们的多波长特性，包括红移。为了识别对应物，我们结合了两种独立方法（NWAY和ASTROMATCH）的结果，这些方法在DESI Legacy Imaging Survey DR 8中检测到的23 k XMM-牛顿源样本的多波长特性上进行了训练。然后将辅助巡天的光谱红移和测光结果进行比较，计算测光红移。主样本中有24774/27369（90.5%）个eFEDS源具有可靠的对应物，硬样本中有231/246（93.9%）个eFEDS源具有可靠的对应物，包括2514（3）个同样可能具有第二对应物的源。本文随附了在性能和验证阶段进行的所有观察的eROSITA早期数据发布。本文结合eFEDS巡天主样品和硬样品的主、次对应物星表，给出了它们的多波长性质和红移。
英文摘要：
In November 2019, eROSITA on board of SRG observatory started to map the entire sky in X-rays. After the 4-year survey program, it will reach flux limits about 25 times deeper than ROSAT. During the SRG Performance Verification phase, eROSITA observed a contiguous 140 deg$^2$ area of the sky down to the final depth of the eROSITA all-sky survey ("eROSITA Final Equatorial-Depth Survey": eFEDS), with the goal of obtaining a census of the X-ray emitting populations (stars, compact objects, galaxies, clusters of galaxies, AGN) that will be discovered over the entire sky.
This paper presents the identification of the counterparts to the point-sources detected in eFEDS in the Main and Hard samples described in Brunner et al 2021, and their multi-wavelength properties, including redshift. For the identification of the counterparts we combined the results from two independent methods (NWAY and ASTROMATCH), trained on the multi-wavelength properties of a sample of 23k XMM-Newton sources detected in the DESI Legacy Imaging Survey DR8. Then spectroscopic redshifts and photometry from ancillary surveys are collated for the computation of photometric redshifts. The eFEDS sources with a reliable counterparts are 24774/27369 (90.5\%) in the Main sample and 231/246 (93.9\%) in the Hard sample, including 2514 (3) sources for which a second counterpart is equally likely. [abridged] This paper is accompanying the eROSITA early data release of all the observations performed during the performance and verification phase. Together with the catalogs of primary and secondary counterparts to the Main and Hard samples of the eFEDS survey this paper releases their multi-wavelength properties and redshifts.
The eROSITA Final Equatorial Depth Survey (eFEDS): SDSS spectroscopic observations of X-ray sources
Max Planck Institute for Extraterrestrial Physics（马克斯·普朗克地外物理研究所）；Excellence Cluster ORIGINS（ORIGINS卓越集群）；Max Planck Institut für Astronomie（马克斯·普朗克天体物理研究所）；Dipartimento di Fisica e Astronomia, Università di Bologna（博洛尼亚大学物理与天文系）；INAF – Osservatorio di Astrofisica e Scienza dello Spazio di Bologna（意大利国家天体物理研究所博洛尼亚天文与空间科学观测站）；Department of Astronomy, University of Science and Technology of China（中国科学技术大学天文学系）；Department of Astronomy, University of Washington（华盛顿大学天文学系）；Instituto de Alta Investigación, Universidad de Tarapacá（塔拉帕卡大学高等研究院）
The eROSITA Final Equatorial Depth Survey (eFEDS): X-ray emission around star-forming and quiescent galaxies at $0.05<z<0.3$
我们的目标是在一个大样本的星系的环银河系介质的热相的特征。我们堆叠X射线事件从SRG/eROSITA eFEDS调查周围的中央星系在GAMA 9小时领域，以构建径向投影软X射线光度分布作为其恒星质量和特定的恒星形成率的函数。我们考虑恒星质量范围为$2\times 10^{10}$-$10^{12}$ M $_\odot$（$3\times 10^9$ -$6\times10^{11}$ M $_\odot$）的静止（恒星形成）星系的样本。对于静止的星系，X射线轮廓明显地扩展到整个可用的质量范围;然而，由于投影效应，测量的轮廓可能偏高，因为这些星系往往生活在稠密和炎热的环境中。对于质量最大的恒星形成样本（$\geq10^{11}$ M $_\odot$），有一个延伸发射的检测提示。对于$< 10^{11}$ M $_\odot$的恒星形成星系的X射线叠加配置文件是兼容的未解决的来源，并符合预期的发射从微弱的活动星系核和X射线双星。首次测量了静止星系和恒星形成星系的平均X射线光度与恒星质量之间的平均关系。高质量（$\geq 10^{11}$ M $_\odot$）恒星形成或静止星系遵循预期的维里化热晕的缩放，而低质量恒星形成星系显示出不太突出的光度和较弱的依赖于恒星质量，与弱活动星系核人口的经验模型一致。当比较我们的结果与国家的最先进的数值模拟，我们发现一个整体的一致性大（$>80$ …
