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

Dermer, Charles D.; Cavadini, Massimo; Razzaque, Soebur; Finke, Justin D.; Chiang, James; Lott, Benoit

doi:10.1088/2041-8205/733/2/L21

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

Journal Article · Fri May 06 00:00:00 EDT 2011 · The Astrophysical Journal. Letters

DOI:https://doi.org/10.1088/2041-8205/733/2/L21· OSTI ID:1357237

Dermer, Charles D. ^[1]; Cavadini, Massimo ^[2]; Razzaque, Soebur ^[1]; Finke, Justin D. ^[1]; Chiang, James ^[3]; Lott, Benoit ^[4]

U.S. Naval Research Lab., Washington, D.C. (United States)
Univ. dell'Insubria, Como (Italy)
Stanford Univ., Stanford, CA (United States)
Centre d'Etudes Nucleaires Bordeaux Gradignan, Gradignan (France)

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.

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Research Organization:: SLAC National Accelerator Lab., Menlo Park, CA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-76SF00515

OSTI ID:: 1357237

Journal Information:: The Astrophysical Journal. Letters, Vol. 733, Issue 2; ISSN 2041-8205

Publisher:: Institute of Physics (IOP)Copyright Statement

Country of Publication:: United States

Language:: English

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