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Non-Nuclear Hyper/Ultraluminous X-Ray Sources in the Starbursting Cartwheel Ring Galaxy | Yu Gao
; Q. Daniel Wang
; P. N. Appleton
; Ray A. Lucas
; | Date: |
8 Sep 2003 | Journal: | Astrophys.J. 596 (2003) L171-L174 | Subject: | astro-ph | Affiliation: | 1. University of Massachusetts, 2. SIRTF Science Center/Caltech, 3. Space Telescope Science Institute | Abstract: | We report the Chandra/ACIS-S detection of more than 20 ultraluminous X-ray sources (ULXs, L_{0.5-10 keV} >~ 3 x 10^{39} ergs/sec) in the Cartwheel collisional ring galaxy system, of which over a dozen are located in the outer active star-forming ring. A remarkable hyperluminous X-ray source (HLX, L_{0.5-10 keV} >~ 10^{41} ergs/sec assuming isotropic radiation), which dominates the X-ray emission from the Cartwheel ring, is located in the same segment of the ring as most ULXs. These powerful H/ULXs appear to be coincident with giant HII region complexes, young star clusters, and radio and mid-infrared hot-spots: all strong indicators of recent massive star formation. The X-ray spectra show that H/ULXs have similar properties as those of the {it most luminous} ULXs found in the nearest starbursts and galaxy mergers such as the Antennae galaxies and M82. The close association between the X-ray sources and the starbursting ring strongly suggests that the H/ULXs are intimately associated with the production and rapid evolution of short-lived massive stars. The observations represent the most extreme X-ray luminosities discovered to date associated with star-forming regions--rivaling the X-ray luminosities usually associated with active galactic nuclei. | Source: | arXiv, astro-ph/0309253 | Services: | Forum | Review | PDF | Favorites |
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