X-RAY VARIATIONS AT THE ORBITAL PERIOD FROM CYGNUS X-1 IN THE HIGH/SOFT STATE
| Autor: | Saeqa Dil Vrtilek, Bram Boroson |
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| Rok vydání: | 2010 |
| Předmět: |
High Energy Astrophysical Phenomena (astro-ph.HE)
Physics Astrophysics::High Energy Astrophysical Phenomena X-ray binary FOS: Physical sciences Flux Astronomy and Astrophysics Astrophysics Light curve Orbital period Upper and lower bounds Cosmology Luminosity Soft state Space and Planetary Science Astrophysics - High Energy Astrophysical Phenomena |
| Zdroj: | The Astrophysical Journal. 710:197-206 |
| ISSN: | 1538-4357 0004-637X |
| DOI: | 10.1088/0004-637x/710/1/197 |
| Popis: | Orbital variability has been found in the X-ray hardness of the black hole candidate Cygnus X-1 during the soft/high X-ray state using light curves provided by the Rossi X-ray Timing Explorer's All Sky Monitor. We are able to set broad limits on how the mass-loss rate and X-ray luminosity vary between the hard and soft states. The folded light curve shows diminished flux in the soft X-ray band at phase 0 (defined as the time of of the superior conjunction of the X-ray source). Models of the orbital variability provide slightly superior fits when the absorbing gas is concentrated in neutral clumps and better explain the strong variability in hardness. In combination with the previously established hard/low state dips, our observations give a lower limit to the mass loss rate in the soft state (Mdot Accepted for publication in The Astrophysical Journal |
| Databáze: | OpenAIRE |
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