LOFAR 多频率快照巡天 (MSSS) I. 巡天描述与首批结果
摘要
我们介绍了多频率快照巡天 (MSSS)，这是首个北天 LOFAR 成像巡天。在这篇介绍性论文中，我们首先详细描述了该巡天的动机和设计。与以往的射电巡天相比，MSSS 因其内在的多频率特性而与众不同，它提供了在超过两个倍频程（从 30 到 160 MHz）内探测到的射电源的光谱性质信息。宽频率覆盖以及由 LOFAR 的多波束能力产生的快速巡天速度，使 MSSS 成为首个预计将使用即将到来的平方公里阵列 (SKA) 进行的此类巡天。巡天包含的十六个频带中的两个被选中，以分别与 74 MHz 和 151 MHz 处的大面积甚大阵列 (VLA) 和巨型米波射电望远镜 (GMRT) 巡天的频率覆盖完全重叠。巡天性能在“MSSS 验证场” (MVF) 内得到了展示，这是一个以 J2000 (RA,Dec)=(15h,69deg) 为中心的 100 平方度区域。来自 MVF 的 MSSS 结果与以往的射电巡天星表进行了比较。我们评估了星表中的流量和天体测量不确定性，以及考虑到我们的寻源策略后的完整性和可靠性。我们确定 MVF 内的 90% 完整性水平在 135 MHz 处为 100 mJy（分辨率为 108"），在 50 MHz 处为 550 mJy（分辨率为 166"）。预计包含 150,000-200,000 个源的完整巡天的图像和星表将发布到公共网络服务器上。我们概述了最终巡天产品正在进行的制作计划，以及图像和源星表的最终公开发布计划。
引用
@article{arxiv.1509.01257,
title = {The LOFAR Multifrequency Snapshot Sky Survey (MSSS) I. Survey description and first results},
author = {G. H. Heald and R. F. Pizzo and E. Orrú and R. P. Breton and D. Carbone and C. Ferrari and M. J. Hardcastle and W. Jurusik and G. Macario and D. Mulcahy and D. Rafferty and A. Asgekar and M. Brentjens and R. A. Fallows and W. Frieswijk and M. C. Toribio and B. Adebahr and M. Arts and M. R. Bell and A. Bonafede and J. Bray and J. Broderick and T. Cantwell and P. Carroll and Y. Cendes and A. O. Clarke and J. Croston and S. Daiboo and F. de Gasperin and J. Gregson and J. Harwood and T. Hassall and V. Heesen and A. Horneffer and A. J. van der Horst and M. Iacobelli and V. Jelić and D. Jones and D. Kant and G. Kokotanekov and P. Martin and J. P. McKean and L. K. Morabito and B. Nikiel-Wroczyński and A. Offringa and V. N. Pandey and M. Pandey-Pommier and M. Pietka and L. Pratley and C. Riseley and A. Rowlinson and J. Sabater and A. M. M. Scaife and L. H. A. Scheers and K. Sendlinger and A. Shulevski and M. Sipior and C. Sobey and A. J. Stewart and A. Stroe and J. Swinbank and C. Tasse and J. Trüstedt and E. Varenius and S. van Velzen and N. Vilchez and R. J. van Weeren and S. Wijnholds and W. L. Williams and A. G. de Bruyn and R. Nijboer and M. Wise and A. Alexov and J. Anderson and I. M. Avruch and R. Beck and M. E. Bell and I. van Bemmel and M. J. Bentum and G. Bernardi and P. Best and F. Breitling and W. N. Brouw and M. Brüggen and H. R. Butcher and B. Ciardi and J. E. Conway and E. de Geus and A. de Jong and M. de Vos and A. Deller and R. J. Dettmar and S. Duscha and J. Eislöffel and D. Engels and H. Falcke and R. Fender and M. A. Garrett and J. Grießmeier and A. W. Gunst and J. P. Hamaker and J. W. T. Hessels and M. Hoeft and J. Hörandel and H. A. Holties and H. Intema and N. J. Jackson and E. Jütte and A. Karastergiou and W. F. A. Klijn and V. I. Kondratiev and L. V. E. Koopmans and M. Kuniyoshi and G. Kuper and C. Law and J. van Leeuwen and M. Loose and P. Maat and S. Markoff and R. McFadden and D. McKay-Bukowski and M. Mevius and J. C. A. Miller-Jones and R. Morganti and H. Munk and A. Nelles and J. E. Noordam and M. J. Norden and H. Paas and A. G. Polatidis and W. Reich and A. Renting and H. Röttgering and A. Schoenmakers and D. Schwarz and J. Sluman and O. Smirnov and B. W. Stappers and M. Steinmetz and M. Tagger and Y. Tang and S. ter Veen and S. Thoudam and R. Vermeulen and C. Vocks and C. Vogt and R. A. M. J. Wijers and O. Wucknitz and S. Yatawatta and P. Zarka},
journal= {arXiv preprint arXiv:1509.01257},
year = {2015}
}
备注
23 pages, 19 figures. Accepted for publication in Astronomy & Astrophysics. MSSS Verification Field images and catalog data may be downloaded from http://vo.astron.nl