Accretion disk spectra of the brightest ultraluminous X-ray source in M82

Feng Yuan*, Ronald E. Taam, R. Misra, Xue Bing Wu, Yongquan Xue

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

22 Scopus citations


Emission spectra of hot accretion disks characteristic of advection-dominated accretion flow (ADAF) models are investigated for comparison with the brightest ultraluminous source, X-1, in the galaxy M82. If the spectral state of the source is similar to the low-luminosity hard state of stellar mass black holes in our Galaxy, a fit to the Chandra X-ray spectrum and constraints from the radio and infrared upper limits requires a black hole mass in the range of 9 × 104-5 × 105 M . Lower black hole masses (104 M) are possible if M82 X-l corresponds to the high-luminosity hard state of Galactic black hole X-ray binary sources. Both of these spectrally degenerate hot accretion disk solutions lead to an intermediate-mass black hole interpretation for M82 X-1. Since these solutions have different spectral variability with X-ray luminosity and predict different radio/infrared emission, they could be distinguished by future off-axis Chandra observations or simultaneous sensitive radio/infrared detections.

Original languageEnglish (US)
Pages (from-to)282-287
Number of pages6
JournalAstrophysical Journal
Issue number1 I
StatePublished - Mar 20 2007


  • Black hole physics
  • Galaxies: individual (M82)
  • X-rays: galaxies

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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