在VLASS中寻找双射电活动星系核
A hunt for dual radio active galactic nuclei in the VLASS
摘要：
本白皮书描述了如何设计VLASS，以允许识别距离<7 kpc的候选活动星系核（AGN）。双重活动星系核代表了两个超大质量黑洞正在合并的清晰标志。活动星系核的双重巡天将为结构增长和引力波科学提供丰富的研究资料。无线电波长是识别近距离双星的理想波长，因为受到干扰的恒星和气体物质可以在光学和更短的波长中掩盖它们的存在。有了足够高的分辨率和灵敏度，像VLASS这样的大规模无线电成像调查将发现许多这样的系统，并提供广泛研究在其他波长揭示的候选双系统的无线电特性的手段。我们确定，对于我们的目的，理想的调查将在尽可能高的分辨率，与显着更多的科学回报在A阵列在L波段或更高，或B阵列在C波段或更高。我们在本文件中描述了一系列潜在的调查参数。根据本白皮书中概述的分析，我们理想的调查将创建一个$\gtrsim$ 100双活动星系核的目录：1）中等灵敏度（~1 mJy检测阈值），宽视场（几千平方度）调查，或2）高灵敏度（~10 uJy阈值）调查几百平方度。
英文摘要：
This whitepaper describes how the VLASS could be designed in a manner to allow the identification of candidate dual active galactic nuclei (AGN) at separations <7 kpc. Dual AGN represent a clear marker of two supermassive black holes within an ongoing merger. A dual AGN survey will provide a wealth of studies in structure growth and gravitational-wave science. Radio wavelengths are ideal for identifying close pairs, as disturbed stellar and gaseous material can obscure their presence in optical and shorter wavelengths. With sufficiently high resolution and sensitivity, a large-scale radio imaging survey like the VLASS will uncover many of these systems and provide the means to broadly study the radio properties of candidate dual systems revealed at other wavelengths. We determine that the ideal survey for our purposes will be at as high a resolution as possible, with significantly more science return in A array at L-band or higher, or B array at C-band or higher. We describe a range of potential survey parameters within this document. Based on the analysis outlined in this whitepaper, our ideal survey would create a catalogue of $\gtrsim$100 dual AGN in either: 1) a medium-sensitivity (~1 mJy detection threshold), wide-field (few thousand square degree) survey, or 2) a high-sensitivity (~10 uJy threshold) survey of several hundred square degrees.
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