We present the largest sample of giant radio quasars (GRQs), which are defined as having a projected linear size greater than 0.7 Mpc. The sample consists of 272 GRQs, of which 174 are new objects discovered through cross-matching the NRAO Very Large Array Sky Survey and the Sloan Digital Sky Survey 14th Data Release Quasar Catalog (DR14Q) and confirmed using Faint Images of the Radio Sky at Twenty-Centimeters (FIRST) radio maps. In our analysis we compare the GRQs with 367 smaller, lobe-dominated radio quasars found using our search method, as well as with quasars from the SDSS DR14Q, investigating the parameters characterizing their radio emission (i.e., total and core radio luminosity, radio core prominence), optical properties (black hole masses, accretion rates, distribution in Eigenvector 1 plane) and infrared colors. For the GRQs and smaller radio quasars we find a strong correlation between [O III] luminosity and radio luminosity at 1.4 GHz, indicating a strong connection between radio emission and conditions in the narrow-line region. We spot no significant differences between GRQs and smaller radio quasars, however we show that most extended radio quasars belong to a quasar population of evolved active galactic nuclei with large black hole masses and low accretion rates. We also show that GRQs have bluer W2–W3 colors compared to SDSS quasars with FIRST detections, indicating differences in the structure of the dusty torus.

我们展示了巨型射电类星体 (GRQ) 的最大样本，其定义为投影线性尺寸大于 0.7 Mpc。样本由272个GRQ组成，其中174个是通过NRAO超大阵列巡天和斯隆数字巡天第14次数据发布类星体目录（DR14Q）交叉匹配发现的新天体，并使用20时的射电天空微弱图像确认-厘米（第一）无线电地图。在我们的分析中，我们将 GRQ 与使用我们的搜索方法发现的 367 个较小的、以瓣为主的射电类星体以及来自 SDSS DR14Q 的类星体进行比较，研究表征它们射电发射的参数（即总和核心射电光度、射电核心突出）、光学特性（黑洞质量、吸积率、特征向量 1 平面中的分布）和红外颜色。III ] 1.4 GHz 的光度和射电光度，表明射电发射与窄线区域的条件之间有很强的联系。我们发现 GRQ 和较小的射电类星体之间没有显着差异，但是我们表明，大多数扩展的射电类星体属于具有大黑洞质量和低吸积率的演化活动星系核的类星体群体。我们还表明，与具有 FIRST 检测的 SDSS 类星体相比，GRQ 具有更蓝的 W2-W3 颜色，表明尘埃环的结构存在差异。