A Machine Learning Made Catalog of FR-Ⅱ Radio Galaxies from the FIRST Survey  

作　　者：Bao-Qiang Lao Xiao-Long Yang Sumit Jaiswal Prashanth Mohan Xiao-Hui Sun Sheng-Li Qin Ru-Shuang Zhao 

机构地区：[1]School of Physics and Astronomy,Yunnan University,Kunming 650091.China [2]Shanghai Astronomical Observatory,Chinese Academy of Sciences,Shanghai 200030.China [3]School of Physics and Electronic Science,Guizhou Normal University,Guiyang 550001,China

出　　处：《Research in Astronomy and Astrophysics》2024年第3期266-282,共17页天文和天体物理学研究（英文版）

基　　金：supported by the National SKA Program of China(2022SKA0120101,2022SKA0130100,2022SKA 0130104);the National Natural Science Foundation of China(NSFC,grant No.12103013);the Foundation of Science and Technology of Guizhou Province(Nos.(2021)023);the Foundation of Guizhou Provincial Education Department(Nos.KY(2021)303,KY(2020)003,KY(2023)059);supported by the National Natural Science Foundation of China(NSFC,grant Nos.12103076 and 12233005);the National Key R&D Program of China(2020YFE0202100);the Shanghai Sailing Program(21YF1455300);the China Postdoctoral Science Foundation(2021M693267)。

摘　　要：We present an independent catalog(FRIIRGcat)of 45,241 Fanaroff–Riley TypeⅡ(FR-Ⅱ)radio galaxies compiled from the Very Large Array Faint Images of the Radio Sky at Twenty-centimeters(FIRST)survey and employed the deep learning method.Among them,optical and/or infrared counterparts are identified for 41,425 FR-Ⅱs.This catalog spans luminosities 2.63×10^(22)≤L_(rad)≤6.76×10^(29)W Hz^(-1)and redshifts up to z=5.01.The spectroscopic classification indicates that there are 1431 low-excitation radio galaxies and 260 high-excitation radio galaxies.Among the spectroscopically identified sources,black hole masses are estimated for 4837 FR-Is,which are in 10^(7.5)■M_(BH)■10^(9.5)M_(⊙).Interestingly,this catalog reveals a couple of giant radio galaxies(GRGs),which are already in the existing GRG catalog,confirming the efficiency of this FR-I catalog.Furthermore,284new GRGs are unveiled in this new FR-I sample;they have the largest projected sizes ranging from 701 to1209 kpc and are located at redshifts 0.31<z<2.42.Finally,we explore the distribution of the jet position angle and it shows that the faint Images of the FIRST images are significantly affected by the systematic effect(the observing beams).The method presented in this work is expected to be applicable to the radio sky surveys that are currently being conducted because they have finely refined telescope arrays.On the other hand,we are expecting that further new methods will be dedicated to solving this problem.

关 键 词：radio continuum galaxies-galaxies active-galaxies jets-galaxies STATISTICS 

分 类 号：TP181[自动化与计算机技术—控制理论与控制工程] P16[自动化与计算机技术—控制科学与工程]