Zobrazeno 1 - 10
of 876
pro vyhledávání: '"Vilhu, O."'
(Abridged) X1822-371 is the prototypical accretion disc corona X-ray source, a low-mass X-ray binary viewed at very high inclination, thereby allowing the disc structure and extended disc coronal regions to be visible. We study the structure of the a
Externí odkaz:
http://arxiv.org/abs/1201.3461
We address the problem where the X-ray emission lines are formed and investigate orbital dynamics using Chandra HETG observations, photoionizing calculations and numerical wind-particle simulations.The observed Si XIV (6.185 A) and S XVI (4.733 A) li
Externí odkaz:
http://arxiv.org/abs/0904.3967
We have fitted ~200 RXTE and INTEGRAL spectra of the neutron star LMXB GX 9+9 from 2002-2007 with a model consisting of a disc blackbody and another blackbody representing the spreading layer (SL), i.e. an extended accretion zone on the NS surface as
Externí odkaz:
http://arxiv.org/abs/0811.0493
Autor:
Rodriguez, J., Shaw, S. E., Hannikainen, D. C., Belloni, T., Corbel, S., Bel, M. Cadolle, Chenevez, J., Prat, L., Kretschmar, P., Lehto, H. J., Mirabel, I. F., Paizis, A., Pooley, G., Tagger, M., Varniere, P., Cabanac, C., Vilhu, O.
(abridged) This is the second paper presenting the results of two years of monitoring of GRS 1915+105 with \integral and \rxte and the Ryle Telescope. We present the X-ray spectral and temporal analysis of four observations which showed strong radio
Externí odkaz:
http://arxiv.org/abs/0712.0455
Autor:
Rodriguez, J., Hannikainen, D. C., Shaw, S. E., Pooley, G., Corbel, S., Tagger, M., Mirabel, I. F., Belloni, T., Cabanac, C., Bel, M. Cadolle, Chenevez, J., Kretschmar, P., Lehto, H. J., Paizis, A., Varniere, P., Vilhu, O.
(Abridged) We report the results of monitoring observations of the Galactic microquasar GRS 1915+105 performed simultaneously with INTEGRAL and RXTE Ryle . We present the results of the whole \integral campaign, report the sources that are detected a
Externí odkaz:
http://arxiv.org/abs/0712.0456
Autor:
Beckmann, V., Soldi, S., Belanger, G., Brandt, S., Caballero-Garcia, M. D., De Cesare, G., Gehrels, N., Grebenev, S., Vilhu, O., von Kienlin, A., Courvoisier, T. J. -L.
Aims: The nature of Cygnus X-3 is still not understood well. This binary system might host a black hole or a neutron star. Recent observations by INTEGRAL have shown that Cygnus X-3 was again in an extremely ultrasoft state. Here we present our analy
Externí odkaz:
http://arxiv.org/abs/0708.0473
Autor:
Hjalmarsdotter, L., Zdziarski, A. A., Larsson, S., Beckmann, V., McCollough, M., Hannikainen, D. C., Vilhu, O.
The X-ray binary Cygnus X-3 is a highly variable X-ray source that displays a wide range of observed spectral states. One of the main states is significantly harder than the others, peaking at ~ 20 keV, with only a weak low-energy component. Due to t
Externí odkaz:
http://arxiv.org/abs/0707.2032
The INTEGRAL observatory has been (re-)discovering new X-ray sources since the beginning of nominal operations in early 2003. These sources include X-ray binaries, Active Galactic Nuclei, cataclysmic variables, etc. Amongst the X-ray binaries, the tr
Externí odkaz:
http://arxiv.org/abs/0706.1129
Autor:
Paizis, A., Farinelli, R., Titarchuk, L., Courvoisier, T. J. -L., Bazzano, A., Beckmann, V., Frontera, F., Goldoni, P., Kuulkers, E., Mereghetti, S., Rodriguez, J., Vilhu, O.
We studied and compared the long-term average hard X-ray (>20keV) spectra of a sample of twelve bright low-mass X-ray binaries hosting a neutron star (NS). Our sample comprises the six well studied Galactic Z sources and six Atoll sources, four of wh
Externí odkaz:
http://arxiv.org/abs/astro-ph/0607592
Autor:
Zioutas, K., Dennerl, K., Grande, M., Hoffmann, D. H. H., Huovelin, J., Lakic, B., Orlando, S., Ortiz, A., Papaevangelou, Th., Semertzidis, Y., Tzamarias, Sp., Vilhu, O.
Publikováno v:
J.Phys.Conf.Ser. 39 (2006) 103-106
Magnetic field dependent transient solar observations are suggestive for axion-photon oscillations with light axion(-like) particle involvement. Novel dark-moon measurements with the SMART X-ray detectors can be conclusive for radiatively decaying ma
Externí odkaz:
http://arxiv.org/abs/astro-ph/0603507