用VISTA发现一个新的z=6.82的明亮类星体：VHS J0411-0907
A new bright z=6.82 quasar discovered with VISTA: VHS J0411-0907
摘要：
本文介绍了近红外VISTA半球巡天（VHS）发现的一个新的$z \sim 6.8$类星体的发现，该发现已被ESO新技术望远镜（NTT）和麦哲伦望远镜的光谱学证实。这类星体已被选定的光谱能量分布（SED）分类使用近红外数据从VISTA，光学数据从泛星，和中红外数据从WISE。SED分类算法是用来统计排名两类，前景银河系低质量恒星和高红移类星体，光谱观测之前。VHS J 0411 -0907的Pan-STARRS像素上的强制测光允许改进SED分类减少-PDMATHAMN和光度红移。VHS J 0411 -0907（$z=6.82$，$y_{AB} = 20.1$等，$J_{AB} = 20.0$等）在$z > 6.7$的9个已知类星体中具有最亮的J波段连续等，是目前泛星巡天中发现的最高红移类星体。这个类星体拥有$z>6.5$已知类星体中最低的黑洞质量（$M_{\rm{BH}}= (6.13 \pm 0.51)\times 10^8\:\mathrm{M_{\odot}}$）和最高的爱丁顿比（$2.37\pm0.22$）。高的爱丁顿比表明，某些非常高PDMATHAMV的类星体正在经历超爱丁顿吸积.我们还提出了最好的多项式拟合的颜色与光谱类型的泛星，VISTA和WISE系统的MLT矮星的系数，并提出了一个预测的预期数量的类星体在$z>6.5$。
英文摘要：
We present the discovery of a new $z \sim 6.8$ quasar discovered with the near-IR VISTA Hemisphere Survey (VHS) which has been spectroscopically confirmed by the ESO New Technology Telescope (NTT) and the Magellan telescope. This quasar has been selected by spectral energy distribution (SED) classification using near infrared data from VISTA, optical data from Pan-STARRS, and mid-IR data from WISE. The SED classification algorithm is used to statistically rank two classes; foreground Galactic low-mass stars and high redshift quasars, prior to spectroscopic observation. Forced photometry on Pan-STARRS pixels for VHS J0411-0907 allows to improve the SED classification reduced-$χ^2$ and photometric redshift. VHS J0411-0907 ($z=6.82$, $y_{AB} = 20.1$ mag, $J_{AB} = 20.0$ mag) has the brightest J-band continuum magnitude of the nine known quasars at $z > 6.7$ and is currently the highest redshift quasar detected in the Pan-STARRS survey. This quasar has one of the lowest black hole mass ($M_{\rm{BH}}= (6.13 \pm 0.51)\times 10^8\:\mathrm{M_{\odot}}$) and the highest Eddington ratio ($2.37\pm0.22$) of the known quasars at $z>6.5$. The high Eddington ratio indicates that some very high-$z$ quasars are undergoing super Eddington accretion. We also present coefficients of the best polynomials fits for colours vs spectral type on the Pan-STARRS, VISTA and WISE system for MLT dwarfs and present a forecast for the expected numbers of quasars at $z>6.5$.
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