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Title:
Radio Emission from an Ultraluminous X-ray Source
Authors:
Kaaret, Philip; Corbel, Stephane; Prestwich, Andrea H.; Zezas, Andreas
Affiliation:
AA(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA.), AB(Université Paris 7 and CEA Saclay (Federation APC), CE-Saclay, 91191 Gif-sur-Yvette Cedex, France.), AC(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA.), AD(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA.)
Publication:
Science, Volume 299, Issue 5605, pp. 365-368 (2003).
Publication Date:
01/2003
Category:
ASTRONOMY
Origin:
SCIENCE
DOI:
10.1126/science.1079610
Bibliographic Code:
2003Sci...299..365K

Abstract

The physical nature of ultraluminous x-ray sources is uncertain. Stellar-mass black holes with beamed radiation and intermediate black holes with isotropic radiation are two plausible explanations. We discovered radio emission from an ultraluminous x-ray source in the dwarf irregular galaxy NGC 5408. The x-ray, radio, and optical fluxes as well as the x-ray spectral shape are consistent with beamed relativistic jet emission from an accreting stellar black hole. If confirmed, this would suggest that the ultraluminous x-ray sources may be stellar-mass rather than intermediate-mass black holes. However, interpretation of the source as a jet-producing intermediate-mass black hole cannot be ruled out at this time.
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