2 papers
astro-ph2005
Runaway core collapse and cluster survival: where are the parent clusters of ULXs?
Roberto Soria
Accreting intermediate-mass black holes (IMBHs) have been proposed as an explanation for ultraluminous X-ray sources (ULXs). Runaway core collapse inside a massive cluster is a pos…
astro-ph2003
A ULX in NGC 4559: a "mini-cartwheel" scenario?
Roberto Soria, Mark Cropper, Manfred Pakull
We have studied an ultraluminous X-ray source (ULX) in NGC 4559 with XMM-Newton, and its peculiar star-forming environment with HST/WFPC2. The X-ray source is one of the brightest…