The Discovery of 63 Giant Radio Galaxies in FIRST using DRAGN-hunter
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A catalog of 63 giant radio galaxies (GRGs) identified in the FIRST survey using the DRAGN-hunter algorithm. Included here are the table of GRGs (in votable format; described below) and a tarball containing images for all 63 sources. These images consist of radio contours from FIRST overlaid on grz optical images from LS DR9, with the position of the identified host marked by a green circle. Table descriptionColumns [unit]: Name, Name of the host galaxy (1) RAJ2000 [deg], R.A. of the host galaxy DEJ2000 [deg], Decl. of the host galaxy rmag [mag], r-band magnitude of the host galaxy z, Redshift of the host galaxy zType, Photometric or spectroscopic redshift (2) SFIRST [mJy], Flux density in FIRST logLFIRST [W/Hz], log10 of 1.4GHz luminosity LAS [arcsec], Largest Angular Size LLS [Mpc], Largest Linear Size (3) Notes: uncertain hosts are chosen to yield the lower of several possible redshifts; SDSS J010931.12-023723.8 is the central of three potential host galaxies at similar redshifts and blended into WISEA J010930.98-023722.0 p = photometric redshift from 2022MNRAS.512.3662Ds = spectroscopic redshift from SDSS DR16 (2020ApJS..249....3A) based on H_0_=70 km/s/Mpc, Omega_m_=0.3, Omega_Lambda_=0.7
本数据集收录了通过DRAGN-hunter算法在FIRST巡天中识别出的63个巨型射电星系(giant radio galaxies, GRGs)目录。其中包含GRGs表(格式为votable,详见下文说明)以及包含全部63个源的tarball格式图像压缩包。这些图像为FIRST巡天的射电等高线叠加在LS DR9的grz光学图像之上,识别出的寄主星系位置以绿色圆圈标记。 ### 表字段说明(单位): Name:寄主星系名称 RAJ2000 [deg]:寄主星系的赤经(单位:度) DEJ2000 [deg]:寄主星系的赤纬(单位:度) rmag [mag]:寄主星系的r波段星等(单位:星等) z:寄主星系的红移值 zType:测光红移或光谱红移(注2) SFIRST [mJy]:FIRST巡天中的流量密度(单位:毫央斯基) logLFIRST [W/Hz]:1.4GHz光度的以10为底的对数值(单位:瓦/赫兹) LAS [arcsec]:最大角尺度(单位:角秒) LLS [Mpc]:最大线尺度(单位:百万秒差距) ### 注释: 1. 存在不确定性的寄主星系被选取为多个可能红移中数值较低的那个;SDSS J010931.12-023723.8是红移相近的三个潜在寄主星系的中心成员,且与WISEA J010930.98-023722.0存在源混叠。 2. 标记`p`代表来自2022MNRAS.512.3662的测光红移;标记`s`代表来自SDSS DR16(2020ApJS..249....3A)的光谱红移。 3. 光度计算基于哈勃常数H₀=70 km/s/Mpc、物质密度Ωₘ=0.3以及暗能量密度Ω_Λ=0.7。



