Fermi Gamma-Ray Space Telescope Observations Of Gamma-Ray Outbursts From 3C 454.3 In 2009 December And 2010 April
Abstract
The flat spectrum radio quasar 3C 454.3 underwent an extraordinary outburst in December 2009 when it became the brightest -ray source in the sky for over one week. Its daily flux measured with the Fermi Large Area Telescope at photon energies E > 100 MeV reached F100 = 22 ± 1 × 10-6 ph cm-2 s-1, representing the highest daily flux of any blazar ever recorded in high-energy -rays. It again became the brightest source in the sky in 2010 April, triggering a pointed-mode observation by Fermi. The correlated -ray temporal and spectral properties during these exceptional events are presented and discussed. The main results show flux variability over time scales less than 3 h and very mild spectral variability with an indication of gradual hardening preceding major flares. No consistent loop pattern emerged in the -ray spectral index vs flux plane. A minimum Doppler factor of ≈15 is derived, and the maximum energy of a photon from 3C 454.3 is ≈ 20 GeV. The spectral break at a few GeV is inconsistent with Klein-Nishina softening from power-law electrons scattering Lyα line radiation, and a break in the underlying electron spectrum in blazar leptonic models is implied.
- Authors:
-
- SLAC National Accelerator Lab., Menlo Park, CA (United States); et al.
- Publication Date:
- Research Org.:
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Sponsoring Org.:
- USDOE
- Contributing Org.:
- Fermmi LAT Collaboration
- OSTI Identifier:
- 1357526
- Grant/Contract Number:
- AC02-76SF00515
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Astrophysical Journal
- Additional Journal Information:
- Journal Volume: 721; Journal Issue: 2; Journal ID: ISSN 0004-637X
- Publisher:
- Institute of Physics (IOP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 79 ASTRONOMY AND ASTROPHYSICS
Citation Formats
Ackermann, M. Fermi Gamma-Ray Space Telescope Observations Of Gamma-Ray Outbursts From 3C 454.3 In 2009 December And 2010 April. United States: N. p., 2010.
Web. doi:10.1088/0004-637X/721/2/1383.
Ackermann, M. Fermi Gamma-Ray Space Telescope Observations Of Gamma-Ray Outbursts From 3C 454.3 In 2009 December And 2010 April. United States. doi:10.1088/0004-637X/721/2/1383.
Ackermann, M. Thu .
"Fermi Gamma-Ray Space Telescope Observations Of Gamma-Ray Outbursts From 3C 454.3 In 2009 December And 2010 April". United States. doi:10.1088/0004-637X/721/2/1383. https://www.osti.gov/servlets/purl/1357526.
@article{osti_1357526,
title = {Fermi Gamma-Ray Space Telescope Observations Of Gamma-Ray Outbursts From 3C 454.3 In 2009 December And 2010 April},
author = {Ackermann, M.},
abstractNote = {The flat spectrum radio quasar 3C 454.3 underwent an extraordinary outburst in December 2009 when it became the brightest -ray source in the sky for over one week. Its daily flux measured with the Fermi Large Area Telescope at photon energies E > 100 MeV reached F100 = 22 ± 1 × 10-6 ph cm-2 s-1, representing the highest daily flux of any blazar ever recorded in high-energy -rays. It again became the brightest source in the sky in 2010 April, triggering a pointed-mode observation by Fermi. The correlated -ray temporal and spectral properties during these exceptional events are presented and discussed. The main results show flux variability over time scales less than 3 h and very mild spectral variability with an indication of gradual hardening preceding major flares. No consistent loop pattern emerged in the -ray spectral index vs flux plane. A minimum Doppler factor of ≈15 is derived, and the maximum energy of a photon from 3C 454.3 is ≈ 20 GeV. The spectral break at a few GeV is inconsistent with Klein-Nishina softening from power-law electrons scattering Lyα line radiation, and a break in the underlying electron spectrum in blazar leptonic models is implied.},
doi = {10.1088/0004-637X/721/2/1383},
journal = {Astrophysical Journal},
number = 2,
volume = 721,
place = {United States},
year = {2010},
month = {9}
}
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