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 in | Research in astronomy and astrophysics Vol. 15; no. 3; pp. 313 - 326 |
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| Main Authors | , , , , , , , |
| Format | Journal Article |
| Language | English |
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01.03.2015
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| Online Access | Get full text |
| ISSN | 1674-4527 2397-6209 |
| DOI | 10.1088/1674-4527/15/3/002 |
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| Abstract | 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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| AbstractList | 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. BL Lacertae (BL Lac) objects at high redshifts ([scriptz] > or = 2) are rarely detected. Through careful analysis of its Sloan Digital Sky Survey spectrum, BZB J1450+5201 is confirmed to be a high-[scriptz] BL Lac object with [scriptz] > or = 2.471 by identifying the Ly alpha 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 gamma -ray emission is robust with a confidence level of 6.2[sigma] at 1-3 GeV and 6.7[sigma] 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 J1451.0+5159 is confirmed to be associated with BZB J1450+5201 using the five-year data. The analysis of multiwavelength data, from radio to gamma -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. |
| Author | Neng-Hui Liao Jin-Ming Bai Jian-Guo Wang Hong-Tao Liu Jiu-Jia Zhang Ning Jiang Zun-Li Yuan Liang Chen |
| AuthorAffiliation | Yunnan Observatories, Chinese Academy of Sciences, Kunming 650011, China Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy ofSciences, Kunming 650011, China University of Chinese Academy of Sciences, Beijing 100049, China Key Laboratory for Research in Galaxies and Cosmology, University of Science and Technologyof China, Chinese Academy of Sciences, Hefei 230026, China Department of Astronomy,University of Science and Technology of China, Hefei 230026, China Key Laboratory for Research in Galaxies and Cosmology, Shanghai Astronomical Observatory,Chinese Academy of Sciences, Shanghai 200030, China |
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| Notes | 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. 11-5721/P ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
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| Snippet | 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... BL Lacertae (BL Lac) objects at high redshifts ([scriptz] > or = 2) are rarely detected. Through careful analysis of its Sloan Digital Sky Survey spectrum, BZB... |
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| StartPage | 313 |
| SubjectTerms | 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 |
| Title | Is BZB J1450＋5201 the most distant gamma-ray BL Lacertae object |
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