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Title: CONSTRAINTS ON THE INTERGALACTIC MAGNETIC FIELD WITH GAMMA-RAY OBSERVATIONS OF BLAZARS

Abstract

Distant BL Lacertae objects emit γ rays which interact with the extragalactic background light (EBL), creating electron-positron pairs, and reducing the flux measured by ground-based imaging atmospheric Cherenkov telescopes (IACTs) at very-high energies (VHE). These pairs can Comptonscatter the cosmic microwave background, creating a γ-ray signature at slightly lower energies observable by the Fermi Large Area Telescope (LAT). This signal is strongly dependent on the intergalactic magnetic field (IGMF) strength (B) and its coherence length (LB). We use IACT spectra taken from the literature for 5 VHE-detected BL Lac objects, and combine it with LAT spectra for these sources to constrain these IGMF parameters. Low B values can be ruled out by the constraint that the cascade flux cannot exceed that observed by the LAT. High values of B can be ruled out from the constraint that the EBL-deabsorbed IACT spectrum cannot be greater than the LAT spectrum extrapolated into the VHE band, unless the cascade spectrum contributes a sizable fraction of the LAT flux. We rule out low B values (B . 10-19 G for LB ≥ 1 Mpc) at > 5σ in all trials with different EBL models and data selection, except when

Authors:
 [1];  [2];  [3];  [2]; ORCiD logo [4];  [5];  [3]
  1. Naval Research Lab. (NRL), Washington, DC (United States)
  2. California Polytechnic State Univ. (CalPoly), San Luis Obispo, CA (United States)
  3. Univ. of Maryland Baltimore County (UMBC), Baltimore, MD (United States)
  4. Clemson Univ., SC (United States)
  5. Ecole Polytechnique, Palaiseau (France)
Publication Date:
Research Org.:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1354847
Grant/Contract Number:  
AC02-76SF00515
Resource Type:
Accepted Manuscript
Journal Name:
The Astrophysical Journal (Online)
Additional Journal Information:
Journal Name: The Astrophysical Journal (Online); Journal Volume: 814; Journal Issue: 1; Journal ID: ISSN 1538-4357
Publisher:
Institute of Physics (IOP)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS

Citation Formats

Finke, Justin D., Reyes, Luis C., Georganopoulos, Markos, Reynolds, Kaeleigh, Ajello, Marco, Fegan, Stephen J., and McCann, Kevin. CONSTRAINTS ON THE INTERGALACTIC MAGNETIC FIELD WITH GAMMA-RAY OBSERVATIONS OF BLAZARS. United States: N. p., 2015. Web. doi:10.1088/0004-637X/814/1/20.
Finke, Justin D., Reyes, Luis C., Georganopoulos, Markos, Reynolds, Kaeleigh, Ajello, Marco, Fegan, Stephen J., & McCann, Kevin. CONSTRAINTS ON THE INTERGALACTIC MAGNETIC FIELD WITH GAMMA-RAY OBSERVATIONS OF BLAZARS. United States. https://doi.org/10.1088/0004-637X/814/1/20
Finke, Justin D., Reyes, Luis C., Georganopoulos, Markos, Reynolds, Kaeleigh, Ajello, Marco, Fegan, Stephen J., and McCann, Kevin. Thu . "CONSTRAINTS ON THE INTERGALACTIC MAGNETIC FIELD WITH GAMMA-RAY OBSERVATIONS OF BLAZARS". United States. https://doi.org/10.1088/0004-637X/814/1/20. https://www.osti.gov/servlets/purl/1354847.
@article{osti_1354847,
title = {CONSTRAINTS ON THE INTERGALACTIC MAGNETIC FIELD WITH GAMMA-RAY OBSERVATIONS OF BLAZARS},
author = {Finke, Justin D. and Reyes, Luis C. and Georganopoulos, Markos and Reynolds, Kaeleigh and Ajello, Marco and Fegan, Stephen J. and McCann, Kevin},
abstractNote = {Distant BL Lacertae objects emit γ rays which interact with the extragalactic background light (EBL), creating electron-positron pairs, and reducing the flux measured by ground-based imaging atmospheric Cherenkov telescopes (IACTs) at very-high energies (VHE). These pairs can Comptonscatter the cosmic microwave background, creating a γ-ray signature at slightly lower energies observable by the Fermi Large Area Telescope (LAT). This signal is strongly dependent on the intergalactic magnetic field (IGMF) strength (B) and its coherence length (LB). We use IACT spectra taken from the literature for 5 VHE-detected BL Lac objects, and combine it with LAT spectra for these sources to constrain these IGMF parameters. Low B values can be ruled out by the constraint that the cascade flux cannot exceed that observed by the LAT. High values of B can be ruled out from the constraint that the EBL-deabsorbed IACT spectrum cannot be greater than the LAT spectrum extrapolated into the VHE band, unless the cascade spectrum contributes a sizable fraction of the LAT flux. We rule out low B values (B . 10-19 G for LB ≥ 1 Mpc) at > 5σ in all trials with different EBL models and data selection, except when},
doi = {10.1088/0004-637X/814/1/20},
journal = {The Astrophysical Journal (Online)},
number = 1,
volume = 814,
place = {United States},
year = {Thu Nov 12 00:00:00 EST 2015},
month = {Thu Nov 12 00:00:00 EST 2015}
}

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Blazar Gamma-Rays, Shock Acceleration, and the Extragalactic Background Light
text, January 2007


A Lower-Limit Flux for the Extragalactic Background Light
text, January 2010


The Crab Nebula as a standard candle in very high-energy astrophysics
text, January 2010


Lower limits on ultrahigh-energy cosmic ray and jet powers of TeV blazars
text, January 2011


Dark matter powered stars: Constraints from the extragalactic background light
text, January 2012


Universal upper limit on inflation energy scale from cosmic magnetic field
text, January 2012


Relaxation of Blazar Induced Pair Beams in Cosmic Voids
text, January 2012


A Joint Analysis of BICEP2/Keck Array and Planck Data
text, January 2015


An infrared background--TeV gamma-ray crisis?
text, January 2000


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Testing models of extragalactic γ-ray propagation using observations of extreme blazars in GeV and TeV energy ranges
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New GTC spectroscopic data and a statistical study to better constrain the redshift of the BL Lac RGB J2243 + 203
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Fast radio bursts
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Baryon Loading Efficiency and Particle Acceleration Efficiency of Relativistic Jets: Cases for low Luminosity bl lacs
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Impact of Plasma Instability on Constraint of the Intergalactic Magnetic Field
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Extreme HBL behavior of Markarian 501 during 2012
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The evolution of primordial magnetic fields since their generation
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New synthesis models of consistent extragalactic background light over cosmic time
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Role of matter in gravitation: Going beyond the Einstein-Maxwell theory
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Falsifying cosmological models based on a non-linear electrodynamics
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Fast radio bursts
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Baryon asymmetry and gravitational waves from pseudoscalar inflation
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Cosmological magnetic braking and the formation of high-redshift, super-massive black holes
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The extreme HBL behaviour of Markarian 501 during 2012
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Fast radio bursts [Быстрые радиовсплески]
journal, March 2018


The evolution of primordial magnetic field since its generation
text, January 2015


Baryon Asymmetry and Gravitational Waves from Pseudoscalar Inflation
text, January 2017


Falsifying cosmological models based on a non-linear electrodynamics
text, January 2017


The NuSTAR view on Hard-TeV BL Lacs
text, January 2017


New synthesis models of consistent extragalactic background light over cosmic time
text, January 2018


IMAGINE: A comprehensive view of the interstellar medium, Galactic magnetic fields and cosmic rays
text, January 2018


Fast Radio Bursts
text, January 2019