MOSS II：Saraswati核心区域中频无线电目录
MOSS II: Mid frequency radio catalog of Saraswati core region
AI总结：
MOSS II项目通过MeerKAT观测Saraswati超星团核心区域，研究无线电源计数特性，发现亚毫焦耳级别计数呈现平坦特征，可能反映恒星形成星系主导及星系团场中增强的中间星系核人口。
摘要：
MeerKAT对Saraswati超星团的观测（MOSS）是一个正在进行的项目，旨在研究Saraswati超星团核心区域的无线电和光学性质，最终将对整个超星团区域进行全面调查。我们利用MeerKAT L波段（1.28 GHz）图像，该图像具有8角秒的角分辨率，来自之前对Saraswati超星团核心区域（红移约为0.28）的深度（中心RMS噪声为11-16 uJy/束）试点观测。这些团场覆盖了1.6平方度的区域，每个团区域产生的无线电目录包含1999个和2611个源（5σ限制），分别对应Abell 2631和ZwCl2341。对于每个目录，我们调查了无线电源的噪声特性、天文学测量、流量密度尺度精度、光谱特性等。然后对目录进行了各种观测偏差的校正，以推导无线电源计数。与以往研究一致，我们在亚毫焦耳级别发现计数表现出特征性平坦，表明恒星形成星系（SFG）人口相对于活跃星系核（AGN）的主导地位增加。此外，在这个亚毫焦耳范围内，计数略高（一个“凸起”特征），与其它深度MeerKAT数据和最近的无线电天空模拟相比。我们建议，这一特征可能是由于这些星系团场中增强的中间SFG和/或AGN人口所致。此外，宇宙方差可能在源计数中是一个重要的不确定性来源。
英文摘要：
The MeerKAT Observations of the Saraswati Supercluster (MOSS) is an ongoing project attempting to study the radio and optical properties of the core region of the Saraswati supercluster which will eventually entail a full survey of the entire supercluster region. We have used MeerKAT L-band (1.28 GHz) images at an angular resolution of 8 arcsec from previous deep (central RMS noise of 11 - 16 uJy beam-1) pilot observations of the core region (z ~ 0.28) of the Saraswati supercluster containing the two most massive galaxy clusters: Abell 2631 and ZwCl2341. These cluster fields cover an area of 1.6 deg2 and the radio catalogs produced from each cluster region contain 1999 and 2611 sources (5sigma limit) for Abell 2631 and ZwCL2341, respectively. For each catalogue, we investigated the noise properties, astrometry, flux density scale accuracy, spectral properties, etc of the radio sources. The catalogs were then corrected for various observational biases before derivation of the radio source counts. In agreement with previous studies, we find that at the sub-mJy level our counts show the characteristic flattening, indicating the increased dominance of the star-forming galaxy (SFG) population over the active galactic nuclei (AGN). Furthermore, in this sub-mJy regime the counts lie slightly higher (a 'bump' feature) compared to other deep MeerKAT data and recent radio-sky simulations. We suggest that this feature could be attributed to an enhanced population of intermediate SFG and/or AGNs associated with these galaxy cluster fields. In addition cosmic variance could represent an important source of uncertainty in the source counts.
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