SIMBAD references

2001ApJ...547L.119K - Astrophys. J., 547, L119-L122 (2001/February-1)

Discovery of spectral transitions from two ultraluminous compact X-ray sources in IC 342.

KUBOTA A., MIZUNO T., MAKISHIMA K., FUKAZAWA Y., KOTOKU J., OHNISHI T. and TASHIRO M.

Abstract (from CDS):

Two ASCA observations were made of two ultraluminous compact X-ray sources (ULXs) in the spiral galaxy IC 342. In the 1993 observation, source 2 showed a 0.5-10 keV luminosity of 6x1039 ergs.s–1 (assuming a distance of 4.0 Mpc) and a hard power-law spectrum of photon index ∼1.4. As already reported, source 1 was ∼3 times brighter on that occasion and exhibited a soft spectrum represented by a multicolor disk model with an inner-disk temperature of ∼1.8 keV. The second observation, made in 2000 February, revealed that source 1 had made a transition into a hard spectral state, while source 2 made a transition into a soft spectral state. The ULXs are therefore inferred to exhibit two distinct spectral states, and they sometimes make transitions between them. These results significantly reinforce the scenario that describes ULXs as mass-accreting black holes.

Abstract Copyright:

Journal keyword(s): Black Hole Physics - Galaxies: Spiral - X-Rays: Galaxies

Simbad objects: 7

goto Full paper

goto View the reference in ADS

To bookmark this query, right click on this link: simbad:2001ApJ...547L.119K and select 'bookmark this link' or equivalent in the popup menu


2019.09.17-03:13:20

© Université de Strasbourg/CNRS

    • Contact