The Spreading Layer of GX 9+9 (2007)
Vilhu, Osmi, Paizis, Ada, Hannikainen, Diana, Schultz, Juho, Beckmann, Volker
The spreading layer (SL) on neutron star surface of GX 9+9 during the upper banana state was studied using INTEGRAL and RXTE observations. The SL-area becomes larger with increasing accretion rate...
Modeling of orbital modulation of Cygnus X-3 by particle simulations (2007)
Vilhu, Osmi, Hakala, Pasi, Hjalmarsdotter, Linnea, Hannikainen, Diana, Paizis, Ada, McCollough, Michael
The formation of the circumbinary envelope of Cygnus X-3 was studied by particle simulations of the WR (Wolf Rayet) companion wind. Light curves resulting from electron scattering absorption in this...
An INTEGRAL monitoring of GRS 1915+105 using simultaneous space and ground based instruments (2006)
Rodriguez, Jerome, Pooley, Guy, Hannikainen, Diana, Lehto, Harry J., Belloni, Tomaso, Cadolle-Bel, Marion, ...
We report the results of 3 observations of GRS 1915+105 during which the source is found to show the X-ray dips/spike sequences (cycles). These observations were performed simultaneously with...
A ULX microquasar in NGC 5408? (2006)
Soria, Roberto, Fender, Rob, Hannikainen, Diana, Read, Andrew, Stevens, Ian
We studied the radio source associated with the ultraluminous X-ray source in NGC 5408 (L_X ~ 10^{40} erg/s). The radio spectrum is steep (index ~ -1), consistent with optically-thin synchrotron...
Low and High Angular Momentum Accretion Flows in BHCs: Case Study of XTE J1550-564 (2001)
Soria, Roberto, Wu, Kinwah, Hannikainen, Diana, McCollough, Mike, Hunstead, Richard
The 1998 outburst of XTE J1550-564 started with a hard X-ray spike, rising in less than a day and declining after 3-4 days; at the same time, the soft X-ray flux was rising with a longer timescale (~...