RT Journal Article T1 First bounds on the high-energy emission from isolated Wolf-Rayet binary systems A1 Antoranz Canales, Pedro A1 Barrio Uña, Juan Abel A1 Contreras González, José Luis A1 Fonseca González, Mª Victoria A1 Miranda Pantoja, José Miguel A1 Nieto, Daniel AB 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. PB IOP Publishing SN 2041-8205 YR 2008 FD 2008-09-20 LK https://hdl.handle.net/20.500.14352/50823 UL https://hdl.handle.net/20.500.14352/50823 LA eng NO Aharonian, F., et al. 2002, A&A, 393, L37———. 2005a, A&A, 431, 197———. 2005b, A&A, 442, 1———. 2006, A&A, 460, 743———. 2007, A&A, 467, 1075.Albert, J., et al. 2006, Science, 312, 1771———. 2007, preprint (astro-ph/0702475)———. 2008a, ApJ, 675, L25———. 2008b, Nucl. Instrum. Methods Phys. Res., A588, 424———. 2008c, ApJ, 674, 1037.Albert, J., et al. 2008d, ApJ, 684, 1351———. 2008e, ApJ, submitted (arXiv:0806.1865).Bednarek, W. 2005, MNRAS, 363, L46.Benaglia, P., Romero, G. E. 2003, A&A, 399, 1121.Benaglia, P., Romero, G. E., Stevens, I., Torres, D. F. 2001, A&A, 366, 605.Bonanos, A. Z., et al. 2004, ApJ, 611, L33.Butt, Y., et al. 2003, ApJ, 597, 494———. 2006, ApJ, 643, 238.Churchwell, E., et al. 1992, ApJ, 393, 329.Domingo-Santamaría, E., Torres, D. F. 2006, A&A, 448, 613.Dougherty, S. M., Williams, P. M., Pollaco, D. L. 2000, MNRAS, 316, 143.Dougherty, S. M., et al. 1996, MNRAS, 280, 963.Eichler, D., Usov, H. 1993, ApJ, 402, 271.Fomin, V. P., Stepanian, A. A., Lamb, R. C., Lewis, D. A., Punch, M., Weekes, T. C. 1994, Astropart. Phys., 2, 137.Li, T.-P., Ma, Y.-Q. 1983, ApJ, 272, 317.O’Connor, E., Dougherty, S., Pittard, J., Williams, P. 2005, JRASC, 99, 142.Parizot, E., et al. 2004, A&A, 424, 727.Pittard, J. M., Dougherty, S. M. 2006, MNRAS, 372, 801.Pittard, J. M., et al. 2002, A&A, 388, 335.Rauw, G., et al. 2004, A&A, 420, L9———. 2005, A&A, 432, 985.Reimer, A., Pohl, M., Reimer, O. 2006, ApJ, 644, 1118.Rolke, W. A., Lo´pez, A. M., & Conrad, J. 2005, Nucl. Instrum. Methods Phys. Res., A551, 493.Setia Gunawan, D. Y. A., de Bruyn, A. G., van der Hucht, K. A., Williams, P. M. 2001, A&A, 368, 484.Tescaro, D., et al. 2007, preprint (arXiv:0709.1410).Torres, D. F., Domingo-Santamaría, E., Romero, G. E. 2004, ApJ, 601, L75.Williams, P. M., et al. 1997, MNRAS, 289, 10. NO © The American Astronomical Society. We acknowledge A. Reimer for providing us the theoretical curves depicted in Figure 1. We also would like to thank the Instituto de Astrofisica de Canarias for the excellent working conditions at the Observatorio del Roque de los Muchachos in La Palma. The support of the German BMBF and MPG, Italian INFN, and Spanish CICYT is gratefully acknowledged. This work was also supported by ETH research grant TH 34/043, by the Polish MNiSzW grant N N203 390834, and by the YIP of the Helmholtz Gemeinschaft. NO German BMBF NO German MPG NO Italian INFN NO Spanish CICYT NO ETH NO Polish MNiSzW NO YIP of the Helmholtz Gemeinschaft DS Docta Complutense RD 7 may 2024