Abstract:
We present an extensive study on the X-ray intraday variability of 10 teraelectronvolt-emitting high synchrotron
peaked blazars (HBLs): 1ES 0229+200, 1ES 0414+009, PKS 0548-322, 1ES 1101-232, 1H 1219+301, H 1426+428,
Mrk 501, 1ES 1959+650, PKS 2005-489, and 1ES 2344+514 made with 25 XMM-Newton pointed observations
during its operational period. Intraday variability has been estimated in three energy bands: soft (0.3–2 keV), hard
(2–10 keV), and total (0.3–10 keV). Although seven out of 10 teraelectronvolt HBLs exhibited some intraday
variability at 3σ levels, no major variations exceeding 6% were detected. We explored the spectral properties of the
sample by extracting the hardness ratio from the soft and hard bands; no significant variations in the hardness ratio
were observed in any source. We performed power spectral density analyses on the variable light curves by fitting
power laws, yielding slopes lying in the range of 1.11–2.93 for different HBLs. We briefly discuss possible emission
mechanisms and carry out rough estimates for magnetic fields, electron Lorentz factors, and emission region sizes
for seven of these HBLs.
