Very high-energy gamma rays from the direction of Sagittarius A*

By H. C. Aharonian, et al. 2004

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We report the detection of a point-like source of very high energy (VHE) gamma-rays coincident within 1' of Sgr A*, obtained with the H.E.S.S. array of Cherenkov telescopes. The gamma-rays exhibit a power-law energy spectrum with a spectral index of -2.2 +/- 0.09 +/- 0.15 and a flux above the 165 GeV threshold of (1.82 +/- 0.22) \times 10^{-7} m^{-2} s^{-1}. The measured flux and spectrum differ substantially from recent results reported in particular by the CANGAROO collaboration.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/9f508dc565c22cbe62e8be7cc3a1991c905e495a

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Citations in the corpus

Parameterization of γ, epm, and Neutrino Spectra Produced by p-p Interaction in Astronomical Environments (2006, background): “In the past two years, several SNRs, including RX J1713-3946 and RX J0852-4622, have been imaged in the TeV band with an angular resolution around 0.1◦ by H.E.S.S. (Aharonian et al. 2004b,c; Aharonian 2005).”
The H.E.S.S. Survey of the Inner Galaxy in Very High Energy Gamma Rays (2005, methodology): “7 3946 by the CANGAROO (Enomoto et al. 2002) and the High Energy Stereoscopic System (H.E.S.S.) collaborations (Aharonian et al. 2004c).”
A comment on the emission from the Galactic Center as seen by the Fermi telescope (2010, background): “2, (Aharonian et al. 2004; van Eldik et al. 2008)) and continuing all the way down to ∼ 1 GeV.”
Measuring the kinetic power of active galactic nuclei in the radio mode (2007, background): “…center could play a significant role in the production of the TeVγ-rays recently observed by the HESS (High Energy Stereoscopic System) collaboration (Aharonian et al. 2004; Atoyan & Dermer 2004), as wellas in the heating of the hot (> 8 keV) diffused plasma detected by Chandra(Muno et al. 2004).”
RADIATIVE MODELS OF SGR A* FROM GRMHD SIMULATIONS (2009, background): “…2001; Hornstein et al. 2002; Genzel et al. 2003; Eckart et al. 2006; Schödel et al. 2007), X-rays (Baganoff et al. 2001, 2003; Goldwurm et al. 2003; Porquet et al. 2003; Bélanger et al. 2005, 2006; Porquet et al. 2008), and even γ -rays (Aharonian et al. 2004, but see Aharonian et al. 2008).”
The 511 keV emission from positron annihilation in the Galaxy (2010, background): “Such emission has been detected at Eγ >500 MeV with EGRET/CGRO (Mayer-Hasselwander et al., 1998) and at TeV energies with various instruments (Aharonian et al., 2004; Aharonian et al., 2006, and references therein).”
Galactic Searches for Dark Matter (2012, neutral): “(2012) HESS 5× 104 10− 10000 Namibia Aharonian et al. (2006b)”