LOFAR两米天空调查 - I. 调查描述与初步数据发布
天体物理仪器与方法
2017-02-15 v1 宇宙学与河外天体物理
摘要
LOFAR两米天空调查（LoTSS）是一项深达120-168 MHz的成像调查，最终将覆盖整个北半球。3170个指向点中的每个将被观测8小时，这在大多数赤纬下足以产生分辨率约5角秒、灵敏度约0.1 mJy/束的图像，并实现该调查的主要科学目标：探索大质量黑洞、星系、星系团以及大尺度结构的形成与演化。由于LOFAR的紧凑核心与长基线，这些图像对高度延展和紧凑的发射均具有极佳的灵敏度。出于遗留价值，数据以高光谱与时间分辨率存档，以便于亚角秒成像与谱线研究。本文中我们提供LoTSS的概述。我们勾勒出调查策略、观测状态、当前校准技术、初步数据发布以及预期的科学影响。我们发布的初步图像采用完全自动化但方向无关的校准策略创建，其灵敏度显著高于任何现有大面积低频调查所产生的图像。在分辨率25角秒、典型噪声水平低于0.5 mJy/束、覆盖HETDEX Spring Field区域（赤经10h45m00s至15h30m00s，赤纬45d00m00s至57d00m00s）超过350平方度的图像中，检测到超过44,000个源。
引用
@article{arxiv.1611.02700,
title = {The LOFAR Two-metre Sky Survey - I. Survey Description and Preliminary Data Release},
author = {T. W. Shimwell and H. J. A. Röttgering and P. N. Best and W. L. Williams and T. J. Dijkema and F. de Gasperin and M. J. Hardcastle and G. H. Heald and D. N. Hoang and A. Horneffer and H. Intema and E. K. Mahony and S. Mandal and A. P. Mechev and L. Morabito and J. B. R. Oonk and D. Rafferty and E. Retana-Montenegro and J. Sabater and C. Tasse and R. J. van Weeren and M. Brüggen and G. Brunetti and K. T. Chyży and J. E. Conway and M. Haverkorn and N. Jackson and M. J. Jarvis and J. P. McKean and G. K. Miley and R. Morganti and G. J. White and M. W. Wise and I. M. van Bemmel and R. Beck and M. Brienza and A. Bonafede and G. Calistro Rivera and R. Cassano and A. O. Clarke and D. Cseh and A. Deller and A. Drabent and W. van Driel and D. Engels and H. Falcke and C. Ferrari and S. Fröhlich and M. A. Garrett and J. J. Harwood and V. Heesen and M. Hoeft and C. Horellou and F. P. Israel and A. D. Kapińska and M. Kunert-Bajraszewska and D. J. McKay and N. R. Mohan and E. Orrú and R. F. Pizzo and I. Prandoni and D. J. Schwarz and A. Shulevski and M. Sipior and D. J. B. Smith and S. S. Sridhar and M. Steinmetz and A. Stroe and E. Varenius and P. P. van der Werf and J. A. Zensus and J. T. L. Zwart},
journal= {arXiv preprint arXiv:1611.02700},
year = {2017}
}
备注
23 pages, 15 figures, 3 tables, accepted for publication in A&A