23 research outputs found
Gamma-Ray Emission Concurrent with the Nova in the Symbiotic Binary V407 Cygni
Full text linkNovae are thermonuclear explosions on a white dwarf surface fueled by mass
accreted from a companion star. Current physical models posit that shocked
expanding gas from the nova shell can produce X-ray emission but emission at
higher energies has not been widely expected. Here, we report the Fermi Large
Area Telescope detection of variable gamma-ray (0.1-10 GeV) emission from the
recently-detected optical nova of the symbiotic star V407 Cygni. We propose
that the material of the nova shell interacts with the dense ambient medium of
the red giant primary, and that particles can be accelerated effectively to
produce pi0 decay gamma-rays from proton-proton interactions. Emission
involving inverse Compton scattering of the red giant radiation is also
considered and is not ruled out.Comment: 38 pages, includes Supplementary Online Material; corresponding
authors: C.C. Cheung, A.B. Hill, P. Jean, S. Razzaque, K.S. Woo
Antibody response to crustacean ectoparasites in rainbow trout, Oncorhynchus mykiss (Walbaum), immunized with Argulus foliaceus L. antigen extract
No full textSome Observations on Host Selectivity and the Preferred Location of Argulus foliaceus L. on Four Fish Species
No full textThe costs and benefits of processing emotional stimuli during rapid serial visual presentation
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Anatomical and functional effects ofPharodes banyulensis infections (Copepoda, Poecilostomatoida, Pharodidae) onBlennius pavo (Pisces, Teleostei, Blenniidae) in a french mediterranean pond (Bassin de Thau)
No full textIntegumental damage caused by Dolops ranarum (Stuhlmann, 1891) (Crustacea: Branchiura) to Clarias gariepinus (Burchell), with reference to normal histology and wound-inflicting structures
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Epidermal lesions and fungal infection on the perch, Perca fluviatilis L., in Windermere
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