Abstract
view Abstract Citations (42) References (14) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Properties of M33 X-8, the Nuclear Source in the Nearby Spiral Galaxy Takano, M. ; Mitsuda, K. ; Fukazawa, Y. ; Nagase, F. Abstract The luminous nuclear source in the nearby spiral galaxy M33 was observed with ASCA. The energy spectrum of the source is found to be represented either by a power-law function multiplied by an exponential cutoff or by the multicolor disk model with an additional power-law tail (a prototype model for galactic black hole candidates). The e-folding energy of the cutoff in the former model is restricted to the range 2.0 +/- 0.3 keV. The spectrum is thus significantly softer than typical active galactic nucleus spectra. With the latter model, the luminosity and the energy spectrum can be consistently explained by assuming a close binary system containing a black hole of about 10 M_sun_. However, the probability that such a close binary would be located near the galactic nucleus is low. Publication: The Astrophysical Journal Pub Date: November 1994 DOI: 10.1086/187629 Bibcode: 1994ApJ...436L..47T Keywords: Astronomical Models; Black Holes (Astronomy); Energy Spectra; Spiral Galaxies; X Ray Binaries; X Ray Sources; Active Galactic Nuclei; Light Curve; Spectrum Analysis; Astrophysics; GALAXIES: INDIVIDUAL MESSIER NUMBER: M33; GALAXIES: NUCLEI; X-RAYS: STARS full text sources ADS | data products SIMBAD (2) NED (1) HEASARC (1)
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