IAR   05382
INSTITUTO ARGENTINO DE RADIOASTRONOMIA
Unidad Ejecutora - UE
artículos
Título:
Discovery of high and very high-energy emission from the BL Lacertae object SHBL J001355.9-185406
Autor/es:
H.E.S.S. COLLABORATION; M.C. MEDINA
Revista:
ASTRONOMY AND ASTROPHYSICS
Editorial:
EDP SCIENCES S A
Referencias:
Lugar: Paris; Año: 2013 vol. 554 p. 72 - 80
ISSN:
0004-6361
Resumen:
The detection of the high-frequency peaked BL Lac object (HBL) SHBL
J001355.9-185406 (z = 0.095) at high (HE; 100 MeV < E < 300 GeV)
and very high-energy (VHE; E > 100 GeV) with the Fermi Large Area
Telescope (LAT) and the High Energy Stereoscopic System (H.E.S.S.) is
reported. Dedicated observations were performed with the H.E.S.S.
telescopes, leading to a detection at the 5.5σ significance level.
The measured flux above 310 GeV is (8.3 ± 1.7stat
± 1.7sys) × 10-13 photons
cm-2 s-1 (about 0.6% of that of the Crab Nebula),
and the power-law spectrum has a photon index of Γ = 3.4 ±
0.5stat ± 0.2sys. Using 3.5 years of
publicly available Fermi-LAT data, a faint counterpart has been detected
in the LAT data at the 5.5σ significance level, with an integrated
flux above 300 MeV of (9.3 ± 3.4stat ±
0.8sys) × 10-10 photons cm-2
s-1 and a photon index of Γ = 1.96 ±
0.20stat ± 0.08sys. X-ray observations with
Swift-XRT allow the synchrotron peak energy in νFν
representation to be located at ~1.0 keV. The broadband spectral energy
distribution is modelled with a one-zone synchrotronself-Compton (SSC)
model and the optical data by a black-body emission describing the
thermal emission of the host galaxy. The derived parameters are typical
of HBLs detected at VHE, with a particle-dominated jet.