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First Bounds on the High-Energy Emission from Isolated Wolf-Rayet Binary Systems

Aliu, E ; Anderhub, H ; Antoranz, P ; Barrio, J. A ; Bartko, H ; Biland, A ; Bock, R. K ; Bonnoli, G ; Bosch-Ramon, V ; Britvitch, I ; Camara, M ; Carmona, E ; Chilingarian, A ; Commichau, S ; Contreras, J. L ; Costado, M. T ; Covino, S ; De Cea del Pozo, E ; De Lotto, B ; De Maria, M ; De Sabata, F ; Delgado Mendez, C ; Dominguez, A ; Dorner, D ; Doro, M ; Fagiolini, M ; Ferenc, D ; Fonseca, M. V ; Font, L ; López, R. J. García ; Garczarczyk, M ; Hayashida, M ; Herrero, A ; Hose, J ; Hsu, C. C ; Jogler, T ; Laille, A ; Leonardo, E ; Lindfors, E ; Lombardi, S ; Longo, F ; Lorenz, E ; Majumdar, P ; Maneva, G ; Mankuzhiyil, N ; Mannheim, K ; Maraschi, L ; Mariotti, M ; Martínez, M ; Mazin, D ; Meucci, M ; Miranda, J. M ; Mirzoyan, R ; Nilsson, K ; Ninkovic, J ; Oña-Wilhelmi, E ; Otte, N ; Paoletti, R ; Paredes, J. M ; Pasanen, M ; Pascoli, D ; Pauss, F ; Pegna, R. G ; Perez-Torres, M. A ; Peruzzo, L ; Piccioli, A ; Puchades, N ; Raymers, A ; Rhode, W ; Ribó, M ; Rissi, M ; Rügamer, S ; Saito, T. Y ; Salvati, M ; Sartori, P ; Scalzotto, V ; Schweizer, T ; Shayduk, M ; Shinozaki, K ; Sidro, N ; Sierpowska-Bartosik, A ; Sillanpää, A ; Spanier, F ; Stamerra, A ; Stark, L. S ; Takalo, L ; Tavecchio, F ; Temnikov, P ; Tescaro, D ; Teshima, M ; Torres, D. F ; Turini, N ; Vankov, H ; Venturini, A ; Vitale, V ; Wagner, R. M ; Wittek, W ; Zandanel, F ; Zanin, R ; Zapatero, J

Astrophysical journal. Letters, 2008-09, Vol.685 (1), p.L71-L74 [Periódico revisado por pares]

Chicago, IL: IOP Publishing

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Título:
First Bounds on the High-Energy Emission from Isolated Wolf-Rayet Binary Systems
Autor: Aliu, E ; Anderhub, H ; Antoranz, P ; Barrio, J. A ; Bartko, H ; Biland, A ; Bock, R. K ; Bonnoli, G ; Bosch-Ramon, V ; Britvitch, I ; Camara, M ; Carmona, E ; Chilingarian, A ; Commichau, S ; Contreras, J. L ; Costado, M. T ; Covino, S ; De Cea del Pozo, E ; De Lotto, B ; De Maria, M ; De Sabata, F ; Delgado Mendez, C ; Dominguez, A ; Dorner, D ; Doro, M ; Fagiolini, M ; Ferenc, D ; Fonseca, M. V ; Font, L ; López, R. J. García ; Garczarczyk, M ; Hayashida, M ; Herrero, A ; Hose, J ; Hsu, C. C ; Jogler, T ; Laille, A ; Leonardo, E ; Lindfors, E ; Lombardi, S ; Longo, F ; Lorenz, E ; Majumdar, P ; Maneva, G ; Mankuzhiyil, N ; Mannheim, K ; Maraschi, L ; Mariotti, M ; Martínez, M ; Mazin, D ; Meucci, M ; Miranda, J. M ; Mirzoyan, R ; Nilsson, K ; Ninkovic, J ; Oña-Wilhelmi, E ; Otte, N ; Paoletti, R ; Paredes, J. M ; Pasanen, M ; Pascoli, D ; Pauss, F ; Pegna, R. G ; Perez-Torres, M. A ; Peruzzo, L ; Piccioli, A ; Puchades, N ; Raymers, A ; Rhode, W ; Ribó, M ; Rissi, M ; Rügamer, S ; Saito, T. Y ; Salvati, M ; Sartori, P ; Scalzotto, V ; Schweizer, T ; Shayduk, M ; Shinozaki, K ; Sidro, N ; Sierpowska-Bartosik, A ; Sillanpää, A ; Spanier, F ; Stamerra, A ; Stark, L. S ; Takalo, L ; Tavecchio, F ; Temnikov, P ; Tescaro, D ; Teshima, M ; Torres, D. F ; Turini, N ; Vankov, H ; Venturini, A ; Vitale, V ; Wagner, R. M ; Wittek, W ; Zandanel, F ; Zanin, R ; Zapatero, J
Assuntos: Astronomical observations ; Astronomy ; Astrophysics ; Cosmology and Extra-Galactic Astrophysics ; Earth, ocean, space ; Exact sciences and technology ; Gamma rays ; Observacions astronòmiques ; Physics ; Raigs gamma ; Sciences of the Universe
É parte de: Astrophysical journal. Letters, 2008-09, Vol.685 (1), p.L71-L74
Notas: ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
Descrição: High-energy gamma-ray emission is theoretically expected to arise in tight binary star systems (with high mass loss and high-velocity winds), although the evidence of this relationship has proven to be elusive so far. Here we present the first bounds on this putative emission from isolated Wolf-Rayet (WR) star binaries, WR 147 and WR 146, obtained from observations with the MAGIC telescope. In the unification scheme of Seyfert galaxies, a dusty torus blocks the continuum source and broad-line region in Seyfert 2 galaxies. However it is not clear whether or not and to what extent the torus affects the narrow-line spectra. In this Letter, we show that Seyfert 1 and Seyfert 2 galaxies have different distributions on the [O iii]/H beta versus [N ii]/H alpha diagram (BPT diagram) for narrow lines. Seyfert 2 galaxies display a clear left boundary on the BPT diagram and only 7.3% of them lie on the left. By contrast, Seyfert 1 galaxies do not show such a cutoff and 33.0% of them stand on the left side of the boundary. Among Seyfert 1 galaxies, the distribution varies with the extinction to broad lines. As the extinction increases, the distribution on BPT diagram moves to larger [N ii]/H alpha values. We interpret this as evidence for the obscuration of an inner dense narrow-line region by the dusty torus. We also demonstrate that the [O iii] and broad-line luminosity correlation depends on the extinction of broad lines in the way that high-extinction objects have lower uncorrected [O iii] luminosities, suggesting that [O iii] is partially obscured in these objects. Therefore, using [O iii] as an indicator for the nuclear luminosity will systematically underestimate the nuclear luminosity of Seyfert 2 galaxies.
Editor: Chicago, IL: IOP Publishing
Idioma: Inglês

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First Bounds on the High-Energy Emission from Isolated Wolf-Rayet Binary Systems

Chicago, IL: IOP Publishing

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