134 citations · 562 across the 18 of their papers we have counts for
6 papers · 1 filter
Constraints on Dark Energy from the Observed Expansion of our Cosmic Horizon
Fulvio Melia
Within the context of standard cosmology, an accelerating universe requires the presence of a third `dark' component of energy, beyond matter and radiation. The available data, how…
UHECRs from the Radio Lobes of AGNs
F. Fraschetti, F. Melia
We report a stochastic mechanism of particle acceleration from first principles in an environment having properties like those of Radio Lobes in AGNs. We show that energies $\sim 1…
Ultra-High-Energy Cosmic Rays from the Radio Lobes of AGNs
F. Fraschetti, F. Melia
In the past year, the HiRes and Auger collaborations have reported the discovery of a high-energy cutoff in the ultra-high energy cosmic-ray (UHECR) spectrum, and an apparent clust…
X-ray hiccups from SgrA* observed by XMM-Newton. The second brightest flare and three moderate flares caught in half a day
D. Porquet, N. Grosso, P. Predehl +14
[truncated] In Spring 2007, we observed SgrA* with XMM with a total exposure of ~230ks. We have performed timing and spectral analysis of the new X-ray flares detected during this…
Diffuse TeV Emission at the Galactic Centre
Elizabeth Wommer, Fulvio Melia, Marco Fatuzzo
The High-Energy Stereoscopic System (HESS) has detected intense diffuse TeV emission correlated with the distribution of molecular gas along the galactic ridge at the centre of our…
Modulated X-ray Emissivity near the Stress Edge in Sgr A*
M. Falanga, F. Melia, M. Prescher +2
Sgr A* is thought to be the radiative manifestation of a ~3.6E6 Msun supermassive black hole at the Galactic center. Its mm/sub-mm spectrum and its flare emission at IR and X-ray w…