Constraining X-Ray Variability of the Blazar 3C 273 Using XMM-Newton Observations over Two Decades

@article{77346,
   author = {Dinesh, Adithiya and Bhatta, Gopal and Adhikari, Tek P and Mohorian, Maksym and Dhital, Niraj and Chaudhary, Suvas C and Pánis, Radim and Gora, Dariusz},
   article_location = {GB - Spojené království Velké Británie a},
   article_number = {2},
   doi = {http://dx.doi.org/10.3847/1538-4357/acf316},
   keywords = {log parabolic spectra;bl-lac objects;particle-acceleration;intraday variability;optical variability;S5 0716+714;gamma-rays;emission;jet;model},
   language = {eng},
   issn = {0004-637X},
   journal = {Astrophysical Journal},
   title = {Constraining X-Ray Variability of the Blazar 3C 273 Using XMM-Newton Observations over Two Decades},
   url = {https://iopscience.iop.org/article/10.3847/1538-4357/acf316},
   volume = {955},
   year = {2023}
}

TY  - JOUR
ID  - 77346
AU  - Dinesh, Adithiya - Bhatta, Gopal - Adhikari, Tek P - Mohorian, Maksym - Dhital, Niraj - Chaudhary, Suvas C - Pánis, Radim - Gora, Dariusz
PY  - 2023
TI  - Constraining X-Ray Variability of the Blazar 3C 273 Using XMM-Newton Observations over Two Decades
JF  - Astrophysical Journal
VL  - 955
IS  - 2
SP  - "121-1"-"121-13"
EP  - "121-1"-"121-13"
SN  - 0004637X
KW  - log parabolic spectra;bl-lac objects;particle-acceleration;intraday variability;optical variability;S5 0716+714;gamma-rays;emission;jet;model
UR  - https://iopscience.iop.org/article/10.3847/1538-4357/acf316
N2  - Blazars exhibit relentless variability across diverse spatial and temporal frequencies. The study of long- and short-term variability properties observed in the X-ray band provides insights into the inner workings of the central engine. In this work, we present timing and spectral analyses of the blazar 3C 273 using the X-ray observations from the XMM-Newton telescope covering the period from 2000 to 2020. The methods of timing analyses include estimation of fractional variability, long- and short-term flux distribution, rms-flux relation, and power spectral density analysis. The spectral analysis include estimating a model-independent flux hardness ratio and fitting the observations with multiplicative and additive spectral models such as power law, log-parabola, broken power law, and blackbody. The blackbody represents the thermal emission from the accretion disk, while the other models represent the possible energy distributions of the particles emitting synchrotron radiation in the jet. During the past two decades, the source flux changed by a factor of three, with a considerable fractional variability of 27%. However, the intraday variation was found to be moderate. Flux distributions of the individual observations were consistent with a normal or log-normal distribution, while the overall flux distribution including all observations appears to be rather multimodal and of a complex shape. The spectral analyses indicate that a log-parabola added to a blackbody gives the best fit for most of the observations. The results indicate a complex scenario in which the variability can be attributed to the intricate interaction between the disk/corona system and the jet.
ER  - 

DINESH, Adithiya, Gopal BHATTA, Tek P ADHIKARI, Maksym MOHORIAN, Niraj DHITAL, Suvas C CHAUDHARY, Radim PÁNIS a Dariusz GORA. Constraining X-Ray Variability of the Blazar 3C 273 Using XMM-Newton Observations over Two Decades. \textit{Astrophysical Journal}. GB - Spojené království Velké Británie a, 2023, roč.~955, č.~2, s.~''121-1''-''121-13'', 13 s. ISSN~0004-637X. Dostupné z: https://dx.doi.org/10.3847/1538-4357/acf316.