2013/12/31 by Neng-Hui Liao, N. H. Liao, J. M. Bai +11
Physics and Astronomy · #Astronomy #Astrophysical Phenomena and Observations #Astrophysics #Astrophysics and Cosmic Phenomena #BL Lac object #Blazar #Gamma ray #Gamma-ray bursts and supernovae #Physics #astro-ph.HE
paper · pdf · doi:10.1088/1674-4527/15/3/002
Welcome any suggestions.Accepted for publication in RAA
arxiv created 2014/06/15 · openalex publication_date 2015/02/26 · arxiv updated 2016/03/23 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
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 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 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.