Spectral energy distributions for TeV blazars

• 来源期刊: 天文和天体物理学研究
• 年，卷（期）: 2018,（10）
• 页码范围: 19-32
• 页数: 14页
• 语种: 英文
• DOI: 10.1088/1674-4527/18/10/120

摘要

In this work,we collected a sample of 69 TeV blazars from TeVCat,obtained their multiwavelength observations,and fitted their spectral energy distributions by using a second degree polynomial function.The structure parameters of synchrotron bumps for 68 blazars and those of inverseCompton bumps for 56 blazars were derived.Then,we conducted statistical analysis on the parameters (curvature,peak frequency,peak luminosity,bolometric luminosity and X/γ-ray spectral indexes).From our analysis and discussions,we can conclude the following:(1) There is a clear positive correlation between the synchrotron peak frequency,log vsp,and the inverse-Compton peak frequency,log vICp,and between the synchrotron peak luminosity,log vspLsvp,and the inverse-Compton peak luminosity,log vICpLICvp.(2) The correlation between the peak frequency and the curvature of synchrotron bump is clearly different from that of the inverse-Compton bump,which further indicates that there are different emission mechanisms between them.(3) There is a correlation between log vipC and γ-ray spectral index,αγ,for the TeV blazars:log vpIC =-(4.59 ± 0.30)αγ + (32.67 ± 0.59),which is consistent with previous work.(4) An "L-shape" relation is found between log vsp and αx for both TeV blazars and Fermi blazars.A significant correlation between log vsp and X-ray photon index (αx) is found for the TeV blazars with high synchrotron peak frequency:log vsp =-(3.20 ± 0.34)αx + (24.33 ± 0.79),while the correlation is positive for low synchrotron peaked TeV sources.(5) In the αx-αγ diagram,there is also an "L-shape." The anti-correlation is consistent with results available in the literature,and we also find a positive correlation between them.(6) Inverse-Compton dominant sources have luminous bolometric luminosities.