Testing accretion disk structure with Suzaku data of LMC X-3

Aya Kubota, Chris Done, Shane W. Davis, Tadayasu Dotani, Tsunefumi Mizuno, Yoshihiro Ueda

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

The Suzaku observation of LMC X-3 gives the best data to date on the shape of the accretion disk spectrum. This is due to the combination of very low absorbing column density along this line of sight, which allows the shape of the disk emission to be constrained at low energies by the CCDs while the tail can be simultaneously determined up to 30keV by the high-energy detectors. These data clearly demonstrate that the observed disk spectrum is broader than a simple "sum of blackbodies," and relativistic smearing of the emission is strongly required. However, the intrinsic emission should be more complex than a (color-corrected) sum of blackbodies as it should also contain photoelectric absorption edges from the partially ionized disk photosphere. These are broadened by the relativistic smearing, but the models predict 3%-5% deviations for 1/3-1 solar abundance around the edge energies, significantly stronger than observed. This indicates that the models need to include more physical processes such as self-irradiation, bound-bound (line) absorption, and/or emission from recombination continua and/or lines. Alternatively, if none of these match the data, it may instead require that the accretion disk density and/or emissivity profile with height is different to that assumed. Thus, these data demonstrate the feasibility of observational tests of our fundamental understanding of the vertical structure of accretion disks.

Original languageEnglish
Pages (from-to)860-867
Number of pages8
JournalAstrophysical Journal
Volume714
Issue number1
DOIs
Publication statusPublished - 2010

Fingerprint

accretion disks
accretion
energy
photosphere
emissivity
line of sight
recombination
charge coupled devices
irradiation
continuums
deviation
color
detectors
profiles

Keywords

  • Accretion, accretion disks
  • Black hole physics
  • Stars: individual (LMC X-3)
  • X-rays: stars

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Kubota, A., Done, C., Davis, S. W., Dotani, T., Mizuno, T., & Ueda, Y. (2010). Testing accretion disk structure with Suzaku data of LMC X-3. Astrophysical Journal, 714(1), 860-867. https://doi.org/10.1088/0004-637X/714/1/860

Testing accretion disk structure with Suzaku data of LMC X-3. / Kubota, Aya; Done, Chris; Davis, Shane W.; Dotani, Tadayasu; Mizuno, Tsunefumi; Ueda, Yoshihiro.

In: Astrophysical Journal, Vol. 714, No. 1, 2010, p. 860-867.

Research output: Contribution to journalArticle

Kubota, A, Done, C, Davis, SW, Dotani, T, Mizuno, T & Ueda, Y 2010, 'Testing accretion disk structure with Suzaku data of LMC X-3', Astrophysical Journal, vol. 714, no. 1, pp. 860-867. https://doi.org/10.1088/0004-637X/714/1/860
Kubota, Aya ; Done, Chris ; Davis, Shane W. ; Dotani, Tadayasu ; Mizuno, Tsunefumi ; Ueda, Yoshihiro. / Testing accretion disk structure with Suzaku data of LMC X-3. In: Astrophysical Journal. 2010 ; Vol. 714, No. 1. pp. 860-867.
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