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Title: TIME DELAY OF CASCADE RADIATION FOR TeV BLAZARS AND THE MEASUREMENT OF THE INTERGALACTIC MAGNETIC FIELD

Abstract

Recent claims that the strength B{sub IGMF} of the intergalactic magnetic field (IGMF) is {approx}> 10{sup -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 {approx}> 2(B{sub IGMF}/10{sup -18}G){sup 2}/(E/10 GeV){sup 2} yr for an IGMF coherence length {approx}1 Mpc, where E is the measured photon energy. Restricting TeV activity of 1ES 0229+200 to {approx}3-4 years during which the source has been observed leads to a more robust lower limit of B{sub IGMF} {approx}> 10{sup -18} G, which can be larger by an order of magnitude if the intrinsic source flux above {approx}5-10 TeV from 1ES 0229+200 is strong.

Authors:
; ;  [1];  [2];  [3];  [4]
  1. Space Science Division, U.S. Naval Research Laboratory, Washington, DC 20375 (United States)
  2. Dipartimento di Fisica e Matematica, Universita dell'Insubria, via Valleggio 11, 22100, Como (Italy)
  3. W. W. Hansen Experimental Physics Laboratory, Kavli Institute for Particle Astrophysics and Cosmology, Department of Physics and SLAC National Accelerator Laboratory, Stanford University, Stanford, CA 94305 (United States)
  4. CNRS/IN2P3, Centre d' Etudes Nucleaires Bordeaux Gradignan, UMR 5797, Gradignan, 33175 (France)
Publication Date:
OSTI Identifier:
21562652
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal Letters
Additional Journal Information:
Journal Volume: 733; Journal Issue: 2; Other Information: DOI: 10.1088/2041-8205/733/2/L21; Journal ID: ISSN 2041-8205
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; COHERENCE LENGTH; GALAXIES; GAMMA RADIATION; MAGNETIC FIELDS; TIME DELAY; DIMENSIONS; ELECTROMAGNETIC RADIATION; IONIZING RADIATIONS; LENGTH; RADIATIONS

Citation Formats

Dermer, Charles D, Razzaque, Soebur, Finke, Justin D, Cavadini, Massimo, 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, Razzaque, Soebur, Finke, Justin D, Cavadini, Massimo, 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, Razzaque, Soebur, Finke, Justin D, Cavadini, Massimo, Chiang, James, and Lott, Benoit. Wed . "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.
@article{osti_21562652,
title = {TIME DELAY OF CASCADE RADIATION FOR TeV BLAZARS AND THE MEASUREMENT OF THE INTERGALACTIC MAGNETIC FIELD},
author = {Dermer, Charles D and Razzaque, Soebur and Finke, Justin D and Cavadini, Massimo and Chiang, James and Lott, Benoit},
abstractNote = {Recent claims that the strength B{sub IGMF} of the intergalactic magnetic field (IGMF) is {approx}> 10{sup -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 {approx}> 2(B{sub IGMF}/10{sup -18}G){sup 2}/(E/10 GeV){sup 2} yr for an IGMF coherence length {approx}1 Mpc, where E is the measured photon energy. Restricting TeV activity of 1ES 0229+200 to {approx}3-4 years during which the source has been observed leads to a more robust lower limit of B{sub IGMF} {approx}> 10{sup -18} G, which can be larger by an order of magnitude if the intrinsic source flux above {approx}5-10 TeV from 1ES 0229+200 is strong.},
doi = {10.1088/2041-8205/733/2/L21},
journal = {Astrophysical Journal Letters},
issn = {2041-8205},
number = 2,
volume = 733,
place = {United States},
year = {2011},
month = {6}
}

Works referencing / citing this record:

1WHSP: An IR-based sample of ~1000 VHE γ -ray blazar candidates
journal, June 2015


Deep observation of the NGC 1275 region with MAGIC: search of diffuse γ -ray emission from cosmic rays in the Perseus cluster
journal, April 2016


2WHSP: A multi-frequency selected catalogue of high energy and very high energy γ -ray blazars and blazar candidates
journal, January 2017


VERITAS and multiwavelength observations of the BL Lacertae object 1ES 1741+196
journal, April 2016

  • Abeysekara, A. U.; Archambault, S.; Archer, A.
  • Monthly Notices of the Royal Astronomical Society, Vol. 459, Issue 3
  • DOI: 10.1093/mnras/stw664

On the magnetic fields in voids
journal, November 2012

  • Beck, A. M.; Hanasz, M.; Lesch, H.
  • Monthly Notices of the Royal Astronomical Society: Letters, Vol. 429, Issue 1
  • DOI: 10.1093/mnrasl/sls026

Evolution of inflation-generated magnetic field through phase transitions
journal, November 2012

  • Kahniashvili, Tina; Brandenburg, Axel; Campanelli, Leonardo
  • Physical Review D, Vol. 86, Issue 10
  • DOI: 10.1103/physrevd.86.103005

Gamma-ray halos as a measure of intergalactic magnetic fields: A classical moment problem
journal, September 2011


Limits on the extragalactic background light in the Fermi era
journal, June 2012


1WHSP: An IR-based sample of ~1000 VHE γ -ray blazar candidates
journal, June 2015


Deep observation of the NGC 1275 region with MAGIC: search of diffuse γ -ray emission from cosmic rays in the Perseus cluster
journal, April 2016


2WHSP: A multi-frequency selected catalogue of high energy and very high energy γ -ray blazars and blazar candidates
journal, January 2017


VERITAS and multiwavelength observations of the BL Lacertae object 1ES 1741+196
journal, April 2016

  • Abeysekara, A. U.; Archambault, S.; Archer, A.
  • Monthly Notices of the Royal Astronomical Society, Vol. 459, Issue 3
  • DOI: 10.1093/mnras/stw664

On the magnetic fields in voids
journal, November 2012

  • Beck, A. M.; Hanasz, M.; Lesch, H.
  • Monthly Notices of the Royal Astronomical Society: Letters, Vol. 429, Issue 1
  • DOI: 10.1093/mnrasl/sls026

Gamma-ray halos as a measure of intergalactic magnetic fields: A classical moment problem
journal, September 2011


Evolution of inflation-generated magnetic field through phase transitions
journal, November 2012

  • Kahniashvili, Tina; Brandenburg, Axel; Campanelli, Leonardo
  • Physical Review D, Vol. 86, Issue 10
  • DOI: 10.1103/physrevd.86.103005