Details

Autor(en) / Beteiligte

• Antoranz, P
• Barrio, J. A
• Bastieri, D
• Becerra González, J
• Bednarek, W
• Berdyugin, A
• Blanch, O
• Bock, R. K
• Boller, A
• Bonnoli, G
• Bordas, P
• Borla Tridon, D
• Bretz, T
• Cañellas, A
• Colin, P
• Contreras, J. L
• Covino, S
• De Lotto, B
• Delgado Mendez, C
• Diago Ortega, A
• Domínguez, A
• Dominis Prester, D
• Dorner, D
• Doro, M
• Fonseca, M. V
• Font, L
• García López, R. J
• Garczarczyk, M
• Giavitto, G
• Godinović, N
• Hadasch, D
• Häfner, D
• Höhne-Mönch, D
• Huber, B
• Jogler, T
• Klepser, S
• Krähenbühl, T
• Krause, J
• La Barbera, A
• Leonardo, E
• López, M
• Lorenz, E
• Maneva, G
• Mankuzhiyil, N
• Mannheim, K
• Mariotti, M
• Martínez, M
• Meucci, M
• Miranda, J. M
• Mirzoyan, R
• Miyamoto, H
• Moldón, J
• Moralejo, A
• Munar-Adrover, P
• Nieto, D
• Orito, R
• Oya, I
• Paneque, D
• Paoletti, R
• Paredes, J. M
• Pasanen, M
• Pauss, F
• Peruzzo, L
• Pilia, M
• Pochon, J
• Prada, F
• Prandini, E
• Puljak, I
• Reichardt, I
• Rhode, W
• Ribó, M
• Rügamer, S
• Saggion, A
• Salvati, M
• Satalecka, K
• Scalzotto, V
• Schweizer, T
• Shayduk, M
• Sitarek, J
• Spanier, F
• Spiro, S
• Storz, J
• Surić, T
• Takalo, L
• Takami, H
• Tavecchio, F
• Temnikov, P
• Terzić, T
• Tescaro, D
• Teshima, M
• Thom, M
• Tibolla, O
• Treves, A
• Vankov, H
• Vogler, P
• Wagner, R. M
• Weitzel, Q
• Zabalza, V
• Zandanel, F
• Zanin, R

Titel

A Search for Very High Energy Gamma-Ray Emission from Scorpius X-1 with the Magic Telescopes

Ist Teil von

• Astrophysical journal. Letters, 2011-07, Vol.735 (1), p.L5-jQuery1323916932395='48'

Ort / Verlag

United States: IOP Publishing

Erscheinungsjahr

2011

Quelle

EZB-FREE-00999 freely available EZB journals

Beschreibungen/Notizen

• The acceleration of particles up to GeV or higher energies in microquasars has been the subject of considerable theoretical and observational efforts in the past few years. Sco X-1 is a microquasar from which evidence of highly energetic particles in the jet has been found when it is in the so-called Horizontal Branch (HB), a state when the radio and hard X-ray fluxes are higher and a powerful relativistic jet is present. Here we present the first very high energy gamma-ray observations of Sco X-1, obtained with the MAGIC telescopes. An analysis of the whole data set does not yield a significant signal, with 95% CL flux upper limits above 300 GeV at the level of 2.4 X 10--12 cm--2 s--1. Simultaneous RXTE observations were conducted to provide the X-ray state of the source. A selection of the gamma-ray data obtained during the HB based on the X-ray colors did not yield a signal either, with an upper limit of 3.4 X 10--12 cm--2 s--1. These upper limits place a constraint on the maximum TeV luminosity to non-thermal X-ray luminosity of L VHE/L ntX 0.02 that can be related to a maximum TeV luminosity to jet power ratio of L VHE/L j 10--3. Our upper limits indicate that the underlying high-energy emission physics in Sco X-1 must be inherently different from that of the hitherto detected gamma-ray binaries.