Sometimes γ-rays come in twos

Sometimes they come back--the return of influenza.

Diffuse γ-rays from galactic halos

The γ-ray sky as we know it today is a composite of the emission from point sources and diffuse emission (see Fig.1). The most prominent feature is the galactic plane, in which interactions between cosmic rays and the thermal gas lead to γ-ray emission by π-decay and bremsstrahlung. On top of this diffuse emission we see point sources all over the map, part of them being pulsars, another part d...

Cytogenetic and biochemical competency of chamomile essential oil against γ-rays induced mutagenic effects in mice

Background: Chamomile essential oil (CEO) hauls out from Matricaria chamomilla L., is a well-known anti-oxidant. Oxidative stress induces clastogenic and biochemical disorders after γ-irradiation of animals. Materials and Methods: Mice were divided into five groups. Control group received vehicle only.              &nbs...

Ultra - high energy cosmic rays may come from clustered sources

Clustering of cosmic-ray sources affects the flux observed beyond the cutoff imposed by the cosmic microwave background and may be important in interpreting the AGASA, Fly’s Eye, and HiRes data. The standard deviation, σ, in the predicted number, N , of events above 10 eV is σ/N = 0.9(r0/10Mpc) 0.9, where r0 is the unknown scale length of the correlation function (r0 ≃ 10 Mpc for field galaxies...

Ultraèhigh-energy Cosmic Rays May Come from Clustered Sources

Clustering of cosmic-ray sources a†ects the Ñux observed beyond the cuto† imposed by the cosmic microwave background and may be important in interpreting the AGASA, FlyÏs Eye, and HiRes data. The standard deviation, p, in the predicted number N of events above 1020 eV is p/N \ 0.9(r0/10 Mpc)0.9, where is the unknown scale length of the correlation function Mpc for Ðeld galaxies, r0 (r0^ 10 km s...