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arXiv 2403.09855astro-ph.CO
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tSZ选定星系团场中离散源的3mm高灵敏度成像

Sensitive 3mm Imaging of Discrete Sources in the Fields of tSZ-Selected Galaxy Clusters

Simon R. Dicker, Karen Perez Sarmiento, Brian Mason, Tanay Bhandarkar, Mark J. Devlin, Luca Di Mascolo, Saianeesh Haridas, Matt Hilton, Mathew Madhavacheril, Em… 展开作者

Simon R. Dicker, Karen Perez Sarmiento, Brian Mason, Tanay Bhandarkar, Mark J. Devlin, Luca Di Mascolo, Saianeesh Haridas, Matt Hilton, Mathew Madhavacheril, Emily Moravec, Tony Mroczkowski, John Orlowski-Scherer, Charles Romero, Craig L. Sarazin, Jonathan Sievers

AI总结:

本文利用MUSTANG2对243个tSZ选定星系团进行90 GHz盲巡天,探测到24个离散源,发现这些源会造成星系团tSZ信号和质量估计偏差,并揭示了星系团内外源分布与现有模拟不符的现象。

摘要:

本文展示了对243个利用热Sunyaev-Zeldovich效应(tSZ)识别的星系团中的致密源进行盲巡天的结果。该巡天在90 GHz下使用Green Bank望远镜上的MUSTANG2进行,在每个星系团中心达到了1 mJy的5σ探测极限。我们探测到24个离散源。其中大部分(18个)对应已知的射电源,其中5个表现出显著的随时间或光谱指数变化的变异性。其余源在其他波长没有明确的对应体。通过tSZ效应搜索星系团严重依赖于90 GHz的观测,发现的源有可能使星系团的质量估计产生偏差。我们将结果与可用于估计星系团目录中源污染的模拟Websky进行了比较。虽然模拟在星系团中心与我们的观测非常吻合,但在更远处与我们的源分布不匹配。距离星系团中心超过104"的源会使tSZ信号偏高,对于我们的一些源,偏差超过50%。当对整个星系团群进行平均时,效应较小,但仍处于1%到2%的水平。我们还发现,与之前的测量和模拟不同,我们看到星系团外部区域的源数量增加,而在这个tSZ选定样本的中心,源数量比预期的要少。

英文摘要:

In this paper we present the results of a blind survey for compact sources in 243 Galaxy clusters that were identified using the thermal Sunyaev-Zeldovich effect (tSZ). The survey was carried out at 90 GHz using MUSTANG2 on the Green Bank telescope and achieved a $5σ$ detection limit of 1 mJy in the center of each cluster. We detected 24 discrete sources. The majority (18) of these correspond to known radio sources, and of these, 5 show signs of significant variability, either with time or in spectral index. The remaining sources have no clear counterparts at other wavelengths. Searches for galaxy clusters via the tSZ effect strongly rely on observations at 90 GHz, and the sources found have the potential to bias mass estimates of clusters. We compare our results to the simulation Websky that can be used to estimate the source contamination in galaxy cluster catalogs. While the simulation showed a good match to our observations at the clusters' centers, it does not match our source distribution further out. Sources over 104" from a cluster's center bias the tSZ signal high, for some of our sources, by over 50%. When averaged over the whole cluster population the effect is smaller but still at a level of 1 to 2%. We also discovered that unlike previous measurements and simulations we see an enhancement of source counts in the outer regions of the clusters and fewer sources than expected in the centers of this tSZ selected sample.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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