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Title: Time delay of cascade radiation for TeV blazars and the measurement of the intergalactic magnetic field

Abstract

Here, recent claims that the strength B IGMF of the intergalactic magnetic field (IGMF) is ≳10 –15 G are based on upper limits to the expected cascade flux in the GeV band produced by blazar TeV photons absorbed by the extragalactic background light. This limit depends on an assumption that the mean blazar TeV flux remains constant on timescales ≳2(B IGMF/10 –18G) 2/(E/10 GeV) 2 yr for an IGMF coherence length ≈1 Mpc, where E is the measured photon energy. Restricting TeV activity of 1ES 0229+200 to ≈3-4 years during which the source has been observed leads to a more robust lower limit of B IGMF ≳10 –18 G, which can be larger by an order of magnitude if the intrinsic source flux above ≈5-10 TeV from 1ES 0229+200 is strong.

Authors:
 [1];  [2];  [1];  [1];  [3];  [4]
  1. U.S. Naval Research Lab., Washington, D.C. (United States)
  2. Univ. dell'Insubria, Como (Italy)
  3. Stanford Univ., Stanford, CA (United States)
  4. Centre d'Etudes Nucleaires Bordeaux Gradignan, Gradignan (France)
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1357237
Grant/Contract Number:  
AC02-76SF00515
Resource Type:
Accepted Manuscript
Journal Name:
Astrophysical Journal Letters
Additional Journal Information:
Journal Volume: 733; Journal Issue: 2; Journal ID: ISSN 2041-8205
Publisher:
Institute of Physics (IOP)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; galaxies: jets; gamma rays: galaxies; radiation mechanisms: non-thermal

Citation Formats

Dermer, Charles D., Cavadini, Massimo, Razzaque, Soebur, Finke, Justin D., Chiang, James, and Lott, Benoit. Time delay of cascade radiation for TeV blazars and the measurement of the intergalactic magnetic field. United States: N. p., 2011. Web. doi:10.1088/2041-8205/733/2/L21.
Dermer, Charles D., Cavadini, Massimo, Razzaque, Soebur, Finke, Justin D., Chiang, James, & Lott, Benoit. Time delay of cascade radiation for TeV blazars and the measurement of the intergalactic magnetic field. United States. doi:10.1088/2041-8205/733/2/L21.
Dermer, Charles D., Cavadini, Massimo, Razzaque, Soebur, Finke, Justin D., Chiang, James, and Lott, Benoit. Fri . "Time delay of cascade radiation for TeV blazars and the measurement of the intergalactic magnetic field". United States. doi:10.1088/2041-8205/733/2/L21. https://www.osti.gov/servlets/purl/1357237.
@article{osti_1357237,
title = {Time delay of cascade radiation for TeV blazars and the measurement of the intergalactic magnetic field},
author = {Dermer, Charles D. and Cavadini, Massimo and Razzaque, Soebur and Finke, Justin D. and Chiang, James and Lott, Benoit},
abstractNote = {Here, recent claims that the strength BIGMF of the intergalactic magnetic field (IGMF) is ≳10–15 G are based on upper limits to the expected cascade flux in the GeV band produced by blazar TeV photons absorbed by the extragalactic background light. This limit depends on an assumption that the mean blazar TeV flux remains constant on timescales ≳2(B IGMF/10–18G)2/(E/10 GeV)2 yr for an IGMF coherence length ≈1 Mpc, where E is the measured photon energy. Restricting TeV activity of 1ES 0229+200 to ≈3-4 years during which the source has been observed leads to a more robust lower limit of B IGMF ≳10–18 G, which can be larger by an order of magnitude if the intrinsic source flux above ≈5-10 TeV from 1ES 0229+200 is strong.},
doi = {10.1088/2041-8205/733/2/L21},
journal = {Astrophysical Journal Letters},
number = 2,
volume = 733,
place = {United States},
year = {2011},
month = {5}
}

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