Other
Scientific paper
Sep 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006head....9.0181m&link_type=abstract
American Astronomical Society, HEAD meeting #9, #1.81; Bulletin of the American Astronomical Society, Vol. 38, p.342
Other
Scientific paper
Relativistic jets appear to be common phenomena related to accretion on to black holes, both in X-ray binaries and AGN, yet the process of jet formation and its link to the underlying accretion flow and compact object are still not well understood. From an observational point of view, a promising tool is to compare different types of sources to isolate which physical properties are required for jet production. Most notably, by comparing accreting black hole and neutron star systems, we can learn whether properties like event-horizons or intrinsic magnetic fields can influence the birth of a relativistic jet. What we still lack, is unambiguous evidence that neutron stars accreting at a stable rate are capable of powering persistent, continuous, collimated outflows of relativistic particles - the compact jets - as has been seen for stellar-mass and supermassive black holes. This lack of evidence is also the reason why models and simulations for the production of compact jets usually rely on the presence of a fast-spinning black hole and an ergosphere. We observed the neutron star X-ray binary 4U0614+091 with Spitzer/IRAC. The observations reveal excess IR emission of non-thermal origin. The spectral shape of such excess rules out any possible emission mechanism other than optically thin synchrotron emission from the base of a continuously-replenished, relativistic outflow. These results indicate that the process of continuous jet formation works similarly in accreting black holes and (at least certain) neutron stars. Even though quantitative differences remain to be explained, such as the relative dimness of neutron star jets with respect to black hole jets, this indicates that the presence of an accretion disc coupled to an intense gravitational field are the necessary and sufficient ingredients for steady relativistic jets to be formed, regardless of the presence/absence of an event horizon.
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