用事件视界TELESCOPE解析1924-292年的内部喷流结构
Resolving the inner jet structure of 1924-292 with the EVENT HORIZON TELESCOPE
摘要：
我们提出了第一个1.3毫米（230 GHz）的活动星系核喷流的很长的基线干涉模型图像使用关闭相位技术与四元件阵列。类星体1924-292的模型图像是由三个天文台的四台望远镜获得的：夏威夷莫纳克亚山的詹姆斯·克拉克·麦克斯韦望远镜（JCMT），亚利桑那州射电天文台的亚毫米望远镜（SMT），以及加利福尼亚州毫米波天文学研究组合阵列（CARMA）的两台望远镜。通过对1924-292年急流内部结构的空间分辨，得到了比以往观测分辨率大幅度提高的结果。内喷流沿$-53^\circ$的位置角向西北方向延伸，距离初步确定的核约0.38 mas，与低频推断的内喷流结构一致，与厘米喷流的位置角相差$\sim 80^{\circ}$。致密芯的尺寸为0.15“，pc，亮度温度为$1.2\times10^{11}$”，K。与低频下的测量结果相比，低亮温度可能有利于减速喷流模型或粒子级联模型。闭合相的成功测量为利用事件视界望远镜对Sgr A* 及附近活动星系核进行成像和时间分辨铺平了道路。
英文摘要：
We present the first 1.3 mm (230 GHz) very long baseline interferometry model image of an AGN jet using closure phase techniques with a four-element array. The model image of the quasar 1924-292 was obtained with four telescopes at three observatories: the James Clerk Maxwell Telescope (JCMT) on Mauna Kea in Hawaii, the Arizona Radio Observatory's Submillimeter Telescope (SMT) in Arizona, and two telescopes of the Combined Array for Research in Millimeterwave Astronomy (CARMA) in California in April 2009. With the greatly improved resolution compared with previous observations and robust closure phase measurement, the inner jet structure of 1924-292 was spatially resolved. The inner jet extends to the northwest along a position angle of $-53^\circ$ at a distance of 0.38\,mas from the tentatively identified core, in agreement with the inner jet structure inferred from lower frequencies, and making a position angle difference of $\sim 80^{\circ}$ with respect to the cm-jet. The size of the compact core is 0.15\,pc with a brightness temperature of $1.2\times10^{11}$\,K. Compared with those measured at lower frequencies, the low brightness temperature may argue in favor of the decelerating jet model or particle-cascade models. The successful measurement of closure phase paves the way for imaging and time resolving Sgr A* and nearby AGN with the Event Horizon Telescope.
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