X-ray Emission Study of TeV Blazars
Abstract
In this work, we present a systematic X-ray study of 85 TeV-detected blazars based on archival \emph{Swift}-XRT and \emph{NuSTAR} observations available up to May 2024. We derive unabsorbed X-ray fluxes and photon indices through spectral fitting, and investigate their light curves, spectral energy distributions, flux distributions, power spectral densities, and flux-index correlations. Using the fractional variability method, we identify 78 sources as variable in the soft X-ray band and 14 sources as variable in the hard X-ray band. For well-sampled soft X-ray light curves, the flux distributions are generally better described by log-normal functions, while the PSD slopes span βPSD=0.1--$1.6$, with most values between 1.0 and 1.6, where the PSD is defined as P(f)∝ f−βPSD. We find positive correlations between TeV and X-ray luminosities, supporting a leptonic emission scenario. We also find a correlation between X-ray and disk luminosities, whereas no significant correlation is found between X-ray luminosity and black hole mass.
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BibTeX
@misc{ouyang2026xray,
title = {{X-ray Emission Study of TeV Blazars}},
author = {Zhihao Ouyang and Hubing Xiao and Shangchun Xie and Jingyu Wu and Xuhong Ye and Junhang Liu and Lili Yang and Marina Manganaro and Jianzhen Chen and Junhui Fan},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.37114},
eprint = {2610.37114},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.37114},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - X-ray Emission Study of TeV Blazars
AU - Zhihao Ouyang
AU - Hubing Xiao
AU - Shangchun Xie
AU - Jingyu Wu
AU - Xuhong Ye
AU - Junhang Liu
AU - Lili Yang
AU - Marina Manganaro
AU - Jianzhen Chen
AU - Junhui Fan
PY - 2026
DA - 2026/10/27
PB - arXiv
DO - 10.48550/arxiv.2610.37114
UR - https://arxiv.org/abs/2610.37114
AB - In this work, we present a systematic X-ray study of 85 TeV-detected blazars based on archival \emph{Swift}-XRT and \emph{NuSTAR} observations available up to May 2024. We derive unabsorbed X-ray fluxes and photon indices through spectral fitting, and investigate their light curves, spectral energy distributions, flux distributions, power spectral densities, and flux-index correlations. Using the fractional variability method, we identify 78 sources as variable in the soft X-ray band and 14 sources as variable in the hard X-ray band. For well-sampled soft X-ray light curves, the flux distributions are generally better described by log-normal functions, while the PSD slopes span β_PSD=0.1--$1.6$, with most values between 1.0 and 1.6, where the PSD is defined as P(f)∝ f^−β_PSD. We find positive correlations between TeV and X-ray luminosities, supporting a leptonic emission scenario. We also find a correlation between X-ray and disk luminosities, whereas no significant correlation is found between X-ray luminosity and black hole mass.
ER -