出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：Some of the Ultraluminous X-Ray (ULX) sources have associated weak radio counterparts, but
so far none of them has been detected on milliarcsecond scales. Observations with the very long
baseline interferometry (VLBI) technique would be crucial to unveil the real nature of ULXs,
however detecting sources so faint is very challenging. The ULX at the center of M33 is very
close to us and hence a good target to study. Here we give a progress report, so far including 2
sessions of our e-EVN monitoring programme of this source.
