IMPLICATIONS OF THE DELAYED 2013 OUTBURST OF ESO 243-49 HLX-1
IMPLICATIONS OF THE DELAYED 2013 OUTBURST OF ESO 243-49 HLX-1
After showing four quasi-periodic outbursts spaced by ∼1 yr from 2009 to 2012, the hyper luminous X-ray source ESO 243-49 HLX-1, currently the best intermediate mass black hole (IMBH) candidate, showed an outburst in 2013 delayed by more than a month. In Lasota et al., we proposed that the X-ray …