Soft‐excess in ULX spectra: the chilled‐disk scenario | Zendy

Roberto Soria | Zendy; A. C. Gonçalves | Zendy; Zdenka Kuncic | Zendy

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Soft‐excess in ULX spectra: the chilled‐disk scenario

Author(s) -

Roberto Soria,

A. C. Gonçalves,

Zdenka Kuncic

Publication year - 2007

Publication title -

aip conference proceedings

Language(s) - English

Resource type - Conference proceedings

SCImago Journal Rank - 0.177

H-Index - 75

eISSN - 1551-7616

pISSN - 0094-243X

DOI - 10.1063/1.2774966

Subject(s) - spectral line , physics , outflow , thermal , astrophysics , ionization , power law , emission spectrum , atomic physics , computational physics , astronomy , ion , thermodynamics , meteorology , statistics , mathematics , quantum mechanics

Soft X-ray spectra of ULXs show small deviations from a power-law model, thatcan be attributed to reprocessing in a fast, ionized outflow, or to thermalemission from a cool disk. If it is thermal emission, the cool peak temperaturecan be explained by an inner disk that radiates only a small fraction of thegravitational power, transferring the rest to an upscattering medium which isthen responsible for the dominant power-law component. This scenario does notrequire intermediate-mass black holes: we use a phenomenological model to showthat the observed X-ray luminosities and spectra of ULXs are consistent withtypical masses ~ 50-100 Msun.Comment: To appear in the proceedings of "The Multicoloured Landscape of Compact Objects and their Explosive Progenitors: Theory vs Observations", Cefalu', Sicily, June 11-24, 2006 (AIP

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