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How to Determine The Precession of the Inner Accretion Disk in Cygnus X-1
We show that changes in the orientation of the inner accretion disk of Cygnus X-1 affect the shape of the broad Fe K{alpha} emission line emitted from this object, in such a way that eV-level spectral resolution observations (such as those that will be carried out by the ASTRO-E2 satellite) can be used to analyze the dynamics of the disk. We here present a new diagnosis tool, supported by numerical simulations, by which short observations of Cygnus X-1, separated in time, can determine whether its accretion disk actually processes, and if so, determine its period and precession angle. Knowing the precession parameters of Cygnus X-1 would result in a clarification of the origin of such precession, distinguishing between tidal and spin-spin coupling. This approach could also be used for similar studies in other microquasar systems.
Date:
January 5, 2005
Creator:
Torres, D F; Romero, G E; Barcons, X & Lu, Y
System:
The UNT Digital Library
Were domestic camelids present on the prehispanic South American agricultural frontier? An ancient DNA study
Article testing the hypothesis that domesticated camelids occurred in prehispanic, southern Mendoza through analysis of ancient DNA.
Date:
November 5, 2020
Creator:
Johnson, Jeff A.; Kim, Tracy; Wolverton, Steven J.; Gil, Adolfo Fabian; Abbona, Cinthia Carolina & Adolfo, Gustavo Neme
System:
The UNT Digital Library