Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Faculty Publications Article Faculty Publications -Articles Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Creator An entity primarily responsible for making the resource Devanand, P.U.; Gupta, Alok C.; Jithesh, V.; Wiita, Paul J.; Gupta, Archana Title A name given to the resource X-Ray Spectral Variability of 13 TeV High-energy-peaked Blazars with XMM-Newton Date A point or period of time associated with an event in the lifecycle of the resource 01-01-2025 Source A related resource from which the described resource is derived Astrophysical Journal, Supplement Series;Volume;278;Issue;1;Article No.;20; Identifier An unambiguous reference to the resource within a given context <a href="https://doi.org/10.3847/1538-4365/adc10d" target="_blank" rel="noreferrer noopener">https://doi.org/10.3847/1538-4365/adc10d</a> <br /><br /><a href="https://www.scopus.com/pages/publications/105004218456?origin=resultslist" target="_blank" rel="noreferrer noopener">https://www.scopus.com/pages/publications/105004218456?origin=resultslist</a> Coverage The spatial or temporal topic of the resource, the spatial applicability of the resource, or the jurisdiction under which the resource is relevant Devanand P.U., Aryabhatta Research Institute of Observational Sciences (ARIES), Manora Peak, Nainital, 263001, India, Department of Applied Physics/Physics, Mahatma Jyotiba Phule Rohilkhand University, Bareilly, 243006, India; Gupta A.C., Aryabhatta Research Institute of Observational Sciences (ARIES), Manora Peak, Nainital, 263001, India; Jithesh V., Department of Physics and Electronics, Christ University, Hosur Main Road, Bengaluru, 560029, India; Wiita P.J., Department of Physics, The College of New Jersey, 2000 Pennington Road, Ewing, 08628-0718, NJ, United States; Gupta A., Department of Applied Physics/Physics, Mahatma Jyotiba Phule Rohilkhand University, Bareilly, 243006, India Description An account of the resource We present a comprehensive study of the X-ray spectral variability observed in 13 TeV photon-emitting high-energy-peaked BL Lacertae objects (HBLs). These data come from 54 XMM-Newton EPIC-pn pointed observations made during its operational period from 2001 June through 2023 July. We performed spectral studies in the energy range of 0.6-10 keV by fitting X-ray spectra of the pointed observations with power-law and log-parabolic (PL and LP) models. We found at a 99% confidence level that 31 of these X-ray spectra were best fitted with a range of LP models with local photon indices (at 1.0 keV), ? ? 1.75-2.66, and convex curvature parameter ? ? 0.02-0.25. PL models with photon index ? ? 1.78-2.68 best described the spectra of 14-pointed observations. Nine PN spectra resulted in negative curvature parameters in fitting an LP model, and eight among them were significant (? ? 2?err). We fitted broken power-law models to these eight X-ray spectra and found spectral hardening in the range of ?? ? 0.06?0.54 for these observations. EPIC-MOS spectra were also studied for those eight observations to search for similar trends, and we were able to find them in only two, one observation each of PKS 0548-322 and Mrk 501. This indicates the possibility of the coexistence of an inverse Compton component along with the dominant synchrotron component for these two observations. We also performed correlation studies between various LP spectral parameters and briefly discuss their possible implications. 2025. The Author(s). Published by the American Astronomical Society. Publisher An entity responsible for making the resource available American Astronomical Society Relation A related resource ISSN: 670049; Language A language of the resource English Type The nature or genre of the resource Article Rights Information about rights held in and over the resource All Open Access; Gold Open Access; Green Open Access Format The file format, physical medium, or dimensions of the resource online