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arXiv 1503.05558astro-ph.GAastro-ph.CO
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由ALMA观测得到的引力透镜SDP.81的最内层质量分布

The Innermost Mass Distribution of the Gravitational Lens SDP.81 from ALMA Observations

Kenneth C. Wong, Sherry H. Suyu, Satoki Matsushita

摘要:

一个强透镜背景源的中央图像对前景透镜星系的内部质量轮廓斜率、核心半径和其核超大质量黑洞的质量施加了限制。使用高分辨率的长基线阿塔卡玛大型毫米/亚毫米阵列(ALMA)的观测和档案$Hubble~Space~Telescope$($HST$)成像,我们建立引力透镜H-ATLAS J090311.6+003906(也称为SDP. 81)的模型,并寻找缩小的中央图像。透镜星系的活动星系核(AGN)有中心连续辐射,但没有证据表明在任何分子线的中心透镜图像。我们使用CO地图,以确定不包括AGN连续的中心图像的流量限制。我们预测中心图像的通量密度,并使用ALMA数据的限制来约束透镜最里面的质量分布。对于由透镜星系的$HST$测光测量的核心半径为$0.15^{\prime\prime}$的幂律分布,假设中心通量归因于活动星系核,我们发现黑洞质量为$\mathrm{\log(M_{BH}/M_{\odot})} \gtrsim 8.5$是优选的。更深入的观测与中心图像的检测将显着改善透镜星系的最内部的质量分布的约束。

英文摘要:

The central image of a strongly lensed background source places constraints on the foreground lens galaxy's inner mass profile slope, core radius and mass of its nuclear supermassive black hole. Using high-resolution long-baseline Atacama Large Millimeter/submillimeter Array (ALMA) observations and archival $Hubble~Space~Telescope$ ($HST$) imaging, we model the gravitational lens H-ATLAS J090311.6+003906 (also known as SDP.81) and search for the demagnified central image. There is central continuum emission from the lens galaxy's active galactic nucleus (AGN) but no evidence of the central lensed image in any molecular line. We use the CO maps to determine the flux limit of the central image excluding the AGN continuum. We predict the flux density of the central image and use the limits from the ALMA data to constrain the innermost mass distribution of the lens. For a power-law profile with a core radius of $0.15^{\prime\prime}$ measured from $HST$ photometry of the lens galaxy assuming that the central flux is attributed to the AGN, we find that a black hole mass of $\mathrm{\log(M_{BH}/M_{\odot})} \gtrsim 8.5$ is preferred. Deeper observations with a detection of the central image will significantly improve the constraints of the innermost mass distribution of the lens galaxy.

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