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Short-timescale variability of the blazar Mrk 421 from AstroSat and simultaneous multi-wavelength observations. / Chatterjee, Ritaban; Das, Susmita; Khasnovis, Archishman; Ghosh, Ritesh; Kumari, Neeraj; Naik, Sachindra; Larionov, V. M.; Grishina, T. S.; Kopatskaya, E. N.; Larionova, E. G.; Nikiforova, A. A.; Morozov, D. A.; Savchenko, S. S.; Troitskaya, Yu V.; Troitsky, I. S.; Vasilyev, A. A.

In: Journal of Astrophysics and Astronomy, Vol. 42, No. 2, 80, 01.10.2021.

Research output: Contribution to journal › Article › peer-review

Harvard

Chatterjee, R, Das, S, Khasnovis, A, Ghosh, R, Kumari, N, Naik, S, Larionov, VM, Grishina, TS, Kopatskaya, EN, Larionova, EG, Nikiforova, AA, Morozov, DA, Savchenko, SS, Troitskaya, YV, Troitsky, IS & Vasilyev, AA 2021, 'Short-timescale variability of the blazar Mrk 421 from AstroSat and simultaneous multi-wavelength observations', Journal of Astrophysics and Astronomy, vol. 42, no. 2, 80. https://doi.org/10.1007/s12036-021-09709-3

APA

Chatterjee, R., Das, S., Khasnovis, A., Ghosh, R., Kumari, N., Naik, S., Larionov, V. M., Grishina, T. S., Kopatskaya, E. N., Larionova, E. G., Nikiforova, A. A., Morozov, D. A., Savchenko, S. S., Troitskaya, Y. V., Troitsky, I. S., & Vasilyev, A. A. (2021). Short-timescale variability of the blazar Mrk 421 from AstroSat and simultaneous multi-wavelength observations. Journal of Astrophysics and Astronomy, 42(2), [80]. https://doi.org/10.1007/s12036-021-09709-3

Vancouver

Chatterjee R, Das S, Khasnovis A, Ghosh R, Kumari N, Naik S et al. Short-timescale variability of the blazar Mrk 421 from AstroSat and simultaneous multi-wavelength observations. Journal of Astrophysics and Astronomy. 2021 Oct 1;42(2). 80. https://doi.org/10.1007/s12036-021-09709-3

Author

Chatterjee, Ritaban ; Das, Susmita ; Khasnovis, Archishman ; Ghosh, Ritesh ; Kumari, Neeraj ; Naik, Sachindra ; Larionov, V. M. ; Grishina, T. S. ; Kopatskaya, E. N. ; Larionova, E. G. ; Nikiforova, A. A. ; Morozov, D. A. ; Savchenko, S. S. ; Troitskaya, Yu V. ; Troitsky, I. S. ; Vasilyev, A. A. / Short-timescale variability of the blazar Mrk 421 from AstroSat and simultaneous multi-wavelength observations. In: Journal of Astrophysics and Astronomy. 2021 ; Vol. 42, No. 2.

BibTeX

@article{20931dd6a2fa41c1895316641686af11,
title = "Short-timescale variability of the blazar Mrk 421 from AstroSat and simultaneous multi-wavelength observations",
abstract = "We study the multi-wavelength variability of the blazar Mrk 421 at minutes to days timescales using simultaneous data at γ-rays from Fermi, 0.7–20 keV energies from AstroSat, and optical and near infrared (NIR) wavelengths from ground based observatories. We compute the shortest variability timescales at all of the above wave bands and find its value to be ∼ 1.1 ks at the hard X-ray energies and increasingly longer at soft X-rays, optical and NIR wavelengths as well as at the GeV energies. We estimate the value of the magnetic field to be 0.5 Gauss and the maximum Lorentz factor of the emitting electrons ∼ 1.6 × 10 5 assuming that synchrotron radiation cooling drives the shortest variability timescale. Blazars vary at a large range of timescales often from minutes to years. These results, as obtained here from the very short end of the range of variability timescales of blazars, are a confirmation of the leptonic scenario and in particular the synchrotron origin of the X-ray emission from Mrk 421 by relativistic electrons of Lorentz factor as high as 10 5. This particular mode of confirmation has been possible using minutes to days timescale variability data obtained from AstroSat and simultaneous multi-wavelength observations.",
keywords = "Active Galactic Nuclei (AGN), blazar, Mrk 421, multiwavelength, variability, 3C 279, SIGNATURES, RAY LIGHT CURVES, MODEL, RADIATION, GAMMA-RAY, SYNCHRO-COMPTON EMISSION, X-RAY, JETS, SPECTRAL ENERGY-DISTRIBUTION",
author = "Ritaban Chatterjee and Susmita Das and Archishman Khasnovis and Ritesh Ghosh and Neeraj Kumari and Sachindra Naik and Larionov, {V. M.} and Grishina, {T. S.} and Kopatskaya, {E. N.} and Larionova, {E. G.} and Nikiforova, {A. A.} and Morozov, {D. A.} and Savchenko, {S. S.} and Troitskaya, {Yu V.} and Troitsky, {I. S.} and Vasilyev, {A. A.}",
note = "Publisher Copyright: {\textcopyright} 2021, Indian Academy of Sciences.",
year = "2021",
month = oct,
day = "1",
doi = "10.1007/s12036-021-09709-3",
language = "English",
volume = "42",
journal = "Journal of Astrophysics and Astronomy",
issn = "0250-6335",
publisher = "Indian Academy of Sciences",
number = "2",

}

RIS

TY - JOUR

T1 - Short-timescale variability of the blazar Mrk 421 from AstroSat and simultaneous multi-wavelength observations

AU - Chatterjee, Ritaban

AU - Das, Susmita

AU - Khasnovis, Archishman

AU - Ghosh, Ritesh

AU - Kumari, Neeraj

AU - Naik, Sachindra

AU - Larionov, V. M.

AU - Grishina, T. S.

AU - Kopatskaya, E. N.

AU - Larionova, E. G.

AU - Nikiforova, A. A.

AU - Morozov, D. A.

AU - Savchenko, S. S.

AU - Troitskaya, Yu V.

AU - Troitsky, I. S.

AU - Vasilyev, A. A.

N1 - Publisher Copyright: © 2021, Indian Academy of Sciences.

PY - 2021/10/1

Y1 - 2021/10/1

N2 - We study the multi-wavelength variability of the blazar Mrk 421 at minutes to days timescales using simultaneous data at γ-rays from Fermi, 0.7–20 keV energies from AstroSat, and optical and near infrared (NIR) wavelengths from ground based observatories. We compute the shortest variability timescales at all of the above wave bands and find its value to be ∼ 1.1 ks at the hard X-ray energies and increasingly longer at soft X-rays, optical and NIR wavelengths as well as at the GeV energies. We estimate the value of the magnetic field to be 0.5 Gauss and the maximum Lorentz factor of the emitting electrons ∼ 1.6 × 10 5 assuming that synchrotron radiation cooling drives the shortest variability timescale. Blazars vary at a large range of timescales often from minutes to years. These results, as obtained here from the very short end of the range of variability timescales of blazars, are a confirmation of the leptonic scenario and in particular the synchrotron origin of the X-ray emission from Mrk 421 by relativistic electrons of Lorentz factor as high as 10 5. This particular mode of confirmation has been possible using minutes to days timescale variability data obtained from AstroSat and simultaneous multi-wavelength observations.

AB - We study the multi-wavelength variability of the blazar Mrk 421 at minutes to days timescales using simultaneous data at γ-rays from Fermi, 0.7–20 keV energies from AstroSat, and optical and near infrared (NIR) wavelengths from ground based observatories. We compute the shortest variability timescales at all of the above wave bands and find its value to be ∼ 1.1 ks at the hard X-ray energies and increasingly longer at soft X-rays, optical and NIR wavelengths as well as at the GeV energies. We estimate the value of the magnetic field to be 0.5 Gauss and the maximum Lorentz factor of the emitting electrons ∼ 1.6 × 10 5 assuming that synchrotron radiation cooling drives the shortest variability timescale. Blazars vary at a large range of timescales often from minutes to years. These results, as obtained here from the very short end of the range of variability timescales of blazars, are a confirmation of the leptonic scenario and in particular the synchrotron origin of the X-ray emission from Mrk 421 by relativistic electrons of Lorentz factor as high as 10 5. This particular mode of confirmation has been possible using minutes to days timescale variability data obtained from AstroSat and simultaneous multi-wavelength observations.

KW - Active Galactic Nuclei (AGN)

KW - blazar

KW - Mrk 421

KW - multiwavelength

KW - variability

KW - 3C 279

KW - SIGNATURES

KW - RAY LIGHT CURVES

KW - MODEL

KW - RADIATION

KW - GAMMA-RAY

KW - SYNCHRO-COMPTON EMISSION

KW - X-RAY

KW - JETS

KW - SPECTRAL ENERGY-DISTRIBUTION

UR - http://www.scopus.com/inward/record.url?scp=85110534201&partnerID=8YFLogxK

UR - https://www.mendeley.com/catalogue/7a62230a-70a3-3cf7-a041-2ded4879df9f/

U2 - 10.1007/s12036-021-09709-3

DO - 10.1007/s12036-021-09709-3

M3 - Article

AN - SCOPUS:85110534201

VL - 42

JO - Journal of Astrophysics and Astronomy

JF - Journal of Astrophysics and Astronomy

SN - 0250-6335

IS - 2

M1 - 80

ER -

ID: 84327751