The eROSITA Final Equatorial-Depth Survey (eFEDS): The catalog of galaxy clusters and groups
The eROSITA Final Equatorial-Depth Survey (eFEDS): The catalog of galaxy clusters and groups
复制标题
eROSITA 最终赤道深度巡天 (eFEDS)：星系团和星系群的目录
DOI：
10.1051/0004-6361/202141120
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发表时间：
2021
影响因子：
6.5
通讯作者：
et al.
中科院分区：
文献类型：
--
作者：
Liu A.;Bulbul E.;Ghirardini V.;Liu T.;Klein M.;Clerc N.;Oezsoy Y.;Ramos-Ceja M. E.;Pacaud F.;Comparat J.;Okabe N.;Bahar Y. E.;et al.
eROSITA最终赤道深度调查是在光谱-伦琴-伽马/eROSITA望远镜的性能验证阶段进行的，并于2019年11月完成。这次调查的目的是提供第一个erosita选择的星团和群体样本，并在星系团的宇宙学研究背景下测试全天调查的预测。方法在eSASS覆盖的约140平方度范围内，利用eSASS源探测算法探测到542个候选星系团和星系群作为扩展x射线源。我们利用eROSITA x射线数据对542个候选簇进行了成像和光谱分析，并研究了样品的性质。结果我们提供了eROSITA在1 '以内软波段（0.5-2 keV） ~ 10-14erg s - 1cm - 2范围内探测到的候选星系团和星群目录。星团分布在红移范围<s:1> =[0.01, 1.3]，中位数红移ɀmedian= 0.35。利用eROSITA x射线数据，我们在300 kpc和500 kpc两个半径范围内测量了星系团内介质的温度，并以bbb2σ置信水平约束了~1/5（542 / 102）样品的温度。这些团簇的平均温度为~2 keV。通过对成像数据的精确建模，测量了通量、光度、电子密度和气体质量的径向分布。对目录的选择函数、纯度和完整性进行了详细的考察和讨论。该样品的污染分数为~1/5，主要是错误识别的点源。星团的x射线光度函数与最近其他x射线调查的结果吻合得很好。我们还在这一领域发现了19个候选超星团，其中大多数位于0.1和0.5之间的红移，包括之前提出的一个位于<s:1> ~ 0.36的星团。结论eRASS最终赤道深度的eresa星团和群表为eresa全天巡天扩展源探测和表征提供了一个基准的概念验证。我们确认eROSITA在星团科学方面的出色表现，并期望与我们发射前对最终全天调查的期望没有显著偏差。
AimsThe eROSITA Final Equatorial-Depth Survey has been carried out during the performance verification phase of the Spectrum-Roentgen-Gamma/eROSITA telescope and was completed in November 2019. This survey is designed to provide the first eROSITA-selected sample of clusters and groups and to test the predictions for the all-sky survey in the context of cosmological studies with clusters of galaxies.MethodsIn the area of ~140 square degrees covered by eFEDS, 542 candidate clusters and groups of galaxies were detected as extended X-ray sources with the eSASS source detection algorithm. We performed imaging and spectral analysis of the 542 cluster candidates with eROSITA X-ray data and studied the properties of the sample.ResultsWe provide the catalog of candidate galaxy clusters and groups detected by eROSITA in the eFEDS field down to a flux of ~10–14erg s–1cm–2in the soft band (0.5–2 keV) within 1’. The clusters are distributed in the redshift range ɀ=[0.01, 1.3] with a median redshift ɀmedian= 0.35. With eROSITA X-ray data, we measured the temperature of the intracluster medium within two radii, 300 kpc and 500 kpc, and constrained the temperature with >2σconfidence level for ~1/5 (102 out of 542) of the sample. The average temperature of these clusters is ~2 keV. Radial profiles of flux, luminosity, electron density, and gas mass were measured from the precise modeling of the imaging data. The selection function, the purity, and the completeness of the catalog are examined and discussed in detail. The contamination fraction is ~1/5 in this sample and is dominated by misidentified point sources. The X-ray luminosity function of the clusters agrees well with the results obtained from other recent X-ray surveys. We also find 19 supercluster candidates in this field, most of which are located at redshifts between 0.1 and 0.5, including one cluster at ɀ ~ 0.36 that was presented previously.ConclusionsThe eFEDS cluster and group catalog at the final eRASS equatorial depth provides a benchmark proof of concept for the eROSITA All-Sky Survey extended source detection and characterization. We confirm the excellent performance of eROSITA for cluster science and expect no significant deviations from our pre-launch expectations for the final all-sky survey.