Studies of Extragalactic Background Light with TeV BL Lac Objects
arXiv:2008.13107 · doi:10.1093/mnras/staa2634
Abstract
Very high energy (VHE; 100GeV) ray from cosmological distances are attenuated by the extragalactic background light (EBL) in the IR to UV band. By contrasting measured versus intrinsic emission, the EBL photon density can be derived. However, neither the intrinsic spectra nor the EBL is separately known~-~except their combined effect. Here we first present a flexible model-dependent optical depth method to study EBL by fitting the emission spectra of TeV BL Lacs objects via a one-zone leptonic synchrotron self-Compton model (SSC). We have little information about electron energy distributions (EEDs) in the jet, which is critically important to build spectral energy distributions (SEDs) in SSC scenario. Based on the current particle acceleration models, we use two types of EEDs, i,e., a power-law log-parabola (PLLP) EED and a broken power-law (BPL) EED to fit the observed spectra. We obtain that the upper limits of EBL density are around about 30 n W m sr, which are similar to the published measurement. Furthermore, we propose an unprecedented method to test radiation mechanisms involved in TeV objects by simply comparing the reduced EBL density with the limit obtained by galaxy counts, and demonstrate that for some BL Lacs, at least, the one-zone SSC model should be reconsidered.
arXiv commentAccepted by MNRAS
References in corpus (42)
- Cosmological parameters from CMB and other data: a Monte-Carlo approach
- Modeling the Extragalactic Background Light from Stars and Dust
- Deep Galaxy Counts, Extragalactic Background Light, and the Stellar Baryon Budget
- Intergalactic Photon Spectra from the Far IR to the UV Lyman Limit for and the Optical Depth of the Universe to High Energy Gamma-Rays
- Implications of Cosmological Gamma-Ray Absorption II. Modification of gamma-ray spectra
- Synchrotron Self-Compton Analysis of TeV X-ray Selected BL Lacertae Objects
- Number Counts At 3 < lambda < 10 um From the Spitzer Space Telescope
- The Imprint of The Extragalactic Background Light in the Gamma-Ray Spectra of Blazars
- Stochastic Acceleration and the Evolution of Spectral Distributions in SSC Sources: A Self Consistent Modeling of Blazars' Flares
- TeV BL Lac objects at the dawn of the Fermi era
- Klein-Nishina Effects in the Spectra of Non-Thermal Sources Immersed in External Radiation Fields
- Multiwavelength Observations of Markarian 421 in March 2001: an Unprecedented View on the X-ray/TeV Correlated Variability
- New limits on the density of the extragalactic background light in the optical to the far-infrared from the spectra of all known TeV blazars
- Gamma-Ray Studies of Blazars: Synchro-Compton Analysis of Flat Spectrum Radio Quasars
- GeV Gamma-Ray Attenuation and the High-Redshift UV Background
- Radiation Mechanisms and Physical Properties of GeV-TeV BL Lac Objects
- Extra-galactic background light measurements from the far-UV to the far-IR from deep ground and space-based galaxy counts
- Constraints on the Extragalactic Infrared Background from Gamma Ray Observations of Mrk 501
- Time-Dependent Stochastic Particle Acceleration in Astrophysical Plasmas: Exact Solutions Including Momentum-Dependent Escape
- Equipartition Gamma-Ray Blazars and the Location of the Gamma-Ray Emission Site in 3C 279
- Detection of the cosmic γ-ray horizon from multiwavelength observations of blazars
- Evidence for GeV Pair Halos around Low Redshift Blazars
- Discovery of very high energy gamma rays from PKS 1424+240 and multiwavelength constraints on its redshift
- Faraday Rotation Measure due to the Intergalactic Magnetic Field
- Compton rockets and the minimum power of relativistic jets
- The First Detections of the Extragalactic Background Light at 3000, 5500, and 8000A (III): Cosmological Implications
- Emitting electrons spectra and acceleration processes in the jet of Mrk 421: from low state to giant flare state
- Intergalactic Magnetic Fields and Gamma Ray Observations of Extreme TeV Blazars
- A GeV-TeV Measurement of the Extragalactic Background Light
- Constraints on the Extragalactic Background Light from Very High Energy Gamma-Ray Observations of Blazars
- Upper Limits on the Extragalactic Background Light from the Gamma-Ray Spectra of Blazars
- Baryon Loading Efficiency and Particle Acceleration Efficiency of Relativistic Jets: Cases For Low Luminosity BL Lacs
- Bethe-Heitler cascades as a plausible origin of hard spectra in distant TeV blazars
- Estimating the redshift of PKS 0447-439 through its GeV-TeV emission
- Testing one-zone synchrotron-self-Compton models with spectral energy distributions of Mrk 421
- Very high-energy constraints on the Infrared Extragalactic Background Light
- Emitting Electron Spectra and Acceleration Processes in the Jet of PKS 0447-439
- Estimation of the Extragalactic Background Light using TeV Observations of BL~Lacs
- Constraining Extragalactic Background Light From TeV Blazars
- Formation of the Electronic Spectrum in Relativistic Jets of Gamma-Ray Blazars
- Constraining the redshifts of TeV BL Lac objects
- Using the Markov Chain Monte Carlo method to study the physical properties GeV-TeV BL Lac objects