H.E.S.S and Fermi-LAT discovery of gamma rays from the blazar 1ES 1312-423

Abstract

A deep observation campaign carried out by the High Energy Stereoscopic System (H.E.S.S.) on Centaurus A enabled the discovery of gamma rays from the blazar 1ES 1312-423, two degrees away from the radio galaxy. With a differential flux at 1 TeV of (1.9 +/-0.6(stat) +/-0.4(sys)) x 10^{-13} /cm^2 /s /TeV corresponding to 0.5% of the Crab nebula differential flux and a spectral index of 2.9 +/- 0.5 (stat) +/- 0.2 (sys), 1ES 1312-423 is one of the faintest sources ever detected in the very high energy (E>100 GeV) extragalactic sky. A careful analysis using three and a half years of Fermi-LAT data allows the discovery at high energies (E>100 MeV) of a hard spectrum (index of 1.4 +/- 0.4 (stat) +/- 0.2 (sys)) source coincident with 1ES 1312-423. Radio, optical, UV and X-ray observations complete the spectral energy distribution of this blazar, now covering 16 decades in energy. The emission is successfully fitted with a synchrotron self Compton model for the non-thermal component, combined with a black-body spectrum for the optical emission from the host galaxy.

12 pages, 10 figures, accepted in MNRAS

References in corpus (10)

• Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Data Processing, Sky Maps, and Basic Results
• Observations of the Crab Nebula with H.E.S.S
• Fermi Large Area Telescope Bright Gamma-ray Source List
• Background Modelling in Very-High-Energy gamma-ray Astronomy
• Fermi Gamma-ray Imaging of a Radio Galaxy
• Simultaneous observations of PKS 2155-304 with H.E.S.S., Fermi, RXTE and ATOM: spectral energy distributions and variability in a low state
• X-ray spectral evolution of TeV BL Lac objects: eleven years of observations with BeppoSAX, XMM-Newton and SWIFT satellites
• A new analysis strategy for detection of faint gamma-ray sources with Imaging Atmospheric Cherenkov Telescopes
• Unveiling the X-ray/TeV engine in Mkn 421
• Modelling the spectral response of the Swift-XRT CCD camera: Experience learnt from in-flight calibration

Cited by in corpus (33)

• The extragalactic background light, the Hubble constant, and anomalies: conclusions from 20 years of TeV gamma-ray observations
• Search for Spatial Extension in High-Latitude Sources Detected by the Fermi Large Area Telescope
• Are both BL Lacs and pulsar wind nebulae the astrophysical counterparts of IceCube neutrino events?
• Flux upper limits for 47 AGN observed with H.E.S.S. in 2004-2011
• First-Epoch VLBA Imaging of Twenty New TeV Blazars
• The Impact of Plasma Instabilities on the Spectra of TeV Blazars
• Very High Energy outburst of Markarian 501 in May 2009
• Anisotropy test of the axion-like particle Universe opacity effect: a case for the Cherenkov Telescope Array
• The TeV emission of Ap Librae: a hadronic interpretation and prospects for CTA
• X-ray spectral studies of TeV gamma-ray emitting blazars
• Multi-TeV flaring from high energy blazars: An evidence of the photohadronic process
• The Intrinsic Properties of Multiwavelength Energy Spectra for Fermi Teraelectronvolt Blazars
• A simplified view of blazars: the very high energy gamma-ray vision
• Spectral Energy Distributions for TeV Blazars
• Estimation of the Extragalactic Background Light using TeV Observations of BL~Lacs
• The host galaxy and Fermi-LAT counterpart of HESS J1943+213
• Galactic and Extragalactic Sources of Very High Energy Gamma-rays
• Lower Bound on the Cosmic TeV Gamma-ray Background Radiation
• Model-independent Redshift Estimation of BL Lac Objects through VHE Observations
• Exploring TeV candidates of Fermi blazars through machine learning
• The `blazar sequence' in TeV band
• TANAMI: Tracking Active Galactic Nuclei with Austral Milliarcsecond Interferometry. III. First-epoch S band images
• Propagation of very-high-energy $\gamma$-rays from distant blazars
• Search for anomalous features in gamma-ray blazar spectra corrected for the absorption on the extragalactic background light
• GeV-TeV $\gamma$-ray energy spectral break of BL Lac objects
• VHE $\gamma$-ray discovery and multi-wavelength study of the blazar 1ES 2322-409
• Infrared emission from dust and the spectral features of extragalactic gamma-ray sources
• Prospects of additional contribution at Optical-NIR band of EBL in the light of VHE spectra
• The H.E.S.S. extragalactic sky survey with the first decade of observations
• Properties and Possible Physical Origins of $\gamma$-ray Emission in Extreme Synchrotron Blazars
• Revisiting the evidences for spectral anomalies in distant blazars: new data on the photon-ALP mixing
• Simultaneously unveiling the EBL and intrinsic spectral parameters of gamma-ray sources with Hamiltonian Monte Carlo
• The H.E.S.S. Extragalactic Sky