Is BZB J1450＋5201 the most distant gamma-ray BL Lacertae object

BL Lacertae （BL Lac） objects at high redshifts （z ≥ 2） are rarely detected. Through careful analysis of its Sloan Digital Sky Survey spectrum, BZB J1450＋5201 is confirmed to be a high-z BL Lac object with z ≥ 2.471 by identifying the Lyα 1216 and CIV 1548/1550 absorption lines. This indicates that B...

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Published inResearch in astronomy and astrophysics Vol. 15; no. 3; pp. 313 - 326
Main Authors Liao, Neng-Hui, Bai, Jin-Ming, Wang, Jian-Guo, Liu, Hong-Tao, Zhang, Jiu-Jia, Jiang, Ning, Yuan, Zun-Li, Chen, Liang
Format Journal Article
LanguageEnglish
Published 01.03.2015
Subjects
Astronomy
BL Lacertae objects
Broadband
Confidence intervals
Confusion
Emission
Lac天体
Mathematical models
Red shift
Synchrotrons
伽马射线
射线能量
射线辐射
数字巡天
置信水平
虎
蝎
Online AccessGet full text
ISSN1674-4527
2397-6209
DOI10.1088/1674-4527/15/3/002

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Summary:BL Lacertae （BL Lac） objects at high redshifts （z ≥ 2） are rarely detected. Through careful analysis of its Sloan Digital Sky Survey spectrum, BZB J1450＋5201 is confirmed to be a high-z BL Lac object with z ≥ 2.471 by identifying the Lyα 1216 and CIV 1548/1550 absorption lines. This indicates that BZB J1450＋5201 is the most distant BL Lac object discovered to date. Careful analysis of the five-year Fermi-LAT data of 2FGL J1451.0＋5159 shows that its γ-ray emission is robust with a confidence level of 6.2σ at 1-3 GeV and 6.7σ at 3-10 GeV. This analysis with the five-year data overcomes confusion with its bright neighbor, which is a problem when analyzing the two-year data. In addition, 2FGL J 1451.0＋5159 is confirmed to be associated with BZB J1450＋5201 using the five-year data. The analysis of multiwavelength data, from radio to γ-ray energies, indicates that BZB J1450＋5201 is an intermediate synchrotron peaked （ISP） source. Its multiwavelength properties are consistent with distributions of other ISP sources at lower redshifts in the second Fermi-LAT AGN catalog. The pure synchrotron self-Compton （SSC） model seems to be disfavored, but the scattering of weak external emission plus the SSC process can provide a satisfactory description of the broadband emission.
Bibliography:galaxies; active -- BL Lacertae objects;individual （BZB J1450＋5201）-- gamma rays; galaxies -- radiation mechanisms; non-thermal
Neng-Hui Liao, Jin-Ming Bai, Jian-Guo Wang, Hong-Tao Liu, Jiu-Jia Zhang, Ning Jiang, Zun-Li Yuan and Liang Chen （1 Yunnan Observatories, Chinese Academy of Sciences, Kunming 650011, China; 2 Key Laboratory forthe Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming 650011, China; 3 University of Chinese Academy of Sciences, Beijing 100049, China;4 Key Laboratory for Research in Galaxies and Cosmology, University of Science and Technology of China, Chinese Academy of Sciences, Hefei 230026, China;5 Department of Astronomy,-University of Science and Technology of China, Hefei 230026, China;6 Key Laboratory for Research in Galaxies and Cosmology, Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai 200030, China）
BL Lacertae （BL Lac） objects at high redshifts （z ≥ 2） are rarely detected. Through careful analysis of its Sloan Digital Sky Survey spectrum, BZB J1450＋5201 is confirmed to be a high-z BL Lac object with z ≥ 2.471 by identifying the Lyα 1216 and CIV 1548/1550 absorption lines. This indicates that BZB J1450＋5201 is the most distant BL Lac object discovered to date. Careful analysis of the five-year Fermi-LAT data of 2FGL J1451.0＋5159 shows that its γ-ray emission is robust with a confidence level of 6.2σ at 1-3 GeV and 6.7σ at 3-10 GeV. This analysis with the five-year data overcomes confusion with its bright neighbor, which is a problem when analyzing the two-year data. In addition, 2FGL J 1451.0＋5159 is confirmed to be associated with BZB J1450＋5201 using the five-year data. The analysis of multiwavelength data, from radio to γ-ray energies, indicates that BZB J1450＋5201 is an intermediate synchrotron peaked （ISP） source. Its multiwavelength properties are consistent with distributions of other ISP sources at lower redshifts in the second Fermi-LAT AGN catalog. The pure synchrotron self-Compton （SSC） model seems to be disfavored, but the scattering of weak external emission plus the SSC process can provide a satisfactory description of the broadband emission.
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ISSN:1674-4527
2397-6209
DOI:10.1088/1674-4527/15/3/002