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A Radio Nebula Surrounding the Ultra-luminous X-ray Source in NGC 5408 | | Cornelia C. Lang
; Philip Kaaret
; Stephane Corbel
; Allison Mercer
; | | Date: |
14 May 2007 | | Subject: | Astrophysics (astro-ph) | | Abstract: | New radio observations of the counterpart of the ultraluminous X-ray source
in NGC 5408 show for the first time that the radio emission is resolved with an
angular size of 1.5 to 2.0 arcseconds. This corresponds to a physical size of
35-46 pc, and rules out interpretation of the radio emission as beamed emission
from a relativistic jet. In addition, the radio spectral index of the
counterpart is well determined from three frequencies and found to be
alpha=-0.8 pm 0.2. The radio emission is likely to be optically-thin
synchrotron emission from a nebula surrounding the X-ray source. The radio
luminosity of the counterpart is 3.8 x 10^34 erg/s and the minimum energy
required to power the nebula is ~1 x 10^49 erg. These values are two orders of
magnitude larger than in any Galactic nebula powered by an accreting compact
object. | | Source: | arXiv, arxiv.0705.1978 | | Services: | Forum | Review | PDF | Favorites | |
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