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Title: A search for Very High Energy gamma-ray emission from Sco X-1 with the MAGIC telescopes
Author: Bordas Coma, Pol
Bosch i Ramon, Valentí
Cañellas, A.
Moldón Vara, Francisco Javier
Munar i Adrover, Pere
Paredes i Poy, Josep Maria
Ribó Gomis, Marc
Zabalza de Torres, Víctor
Keywords: Acceleradors de partícules
Estels binaris de raigs X
Raigs X
Particle accelerators
X-ray binaries
Issue Date: 1-Jul-2011
Publisher: Institute of Physics (IOP)
Abstract: 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 dataset does not yield a significant signal, with 95% CL flux upper limits above 300 GeV at the level of 2.4x10^{-12} ph/cm^2/s. Simultaneous RXTE observations were conducted to search for TeV emission during particular X-ray states 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 3.4x10^{-12} ph/cm^2/s. 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.
Note: Reproducció del document publicat a:
It is part of: Astrophysical Journal Letters, 2011, vol. 735, num. L5
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ISSN: 2041-8205
Appears in Collections:Articles publicats en revistes (Institut de Ciències del Cosmos (ICCUB))
Articles publicats en revistes (Física Quàntica i Astrofísica)

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