The evolution of black hole states(10)

We discuss the evolution of black hole transients on the basis of a few systems that were intensively observed with the Rossi X-ray Timing Explorer. We focus on the global evolution and the observed state transitions. Rather than giving a numerical recipe

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Figure5.TheHIDofthe2002/2003outburstofGX339-4.Cleartransitionsaremarkedbygraysegments.Thebranchescorrespondingtothefourbasicstatesintheq-trackarelabeled(Bellonietal.,2004).

propertiesthatoncewerethoughttobecharacteristicofthehardandhardintermediatestatesarestillpresentinthesoftstate,althoughinamuchweakerform.

4.4.Discussion

Althoughthepicturepresentedhereissomewhatsimpli ed,asaddi-tionalcomplicationshavebeenobserved,wecansketchthestatesbyusingoncemoreGX339-4asatemplate(seeFig.5andFenderetal.,2004).Asshownabove,thehardintermediateandsoftintermediatestatesarekeptseparate,asbothspectralandtimingevolutionshowmarkeddi erences.

Thehardstateandthehardintermediatestateshavemuchincom-mon.Spectrally,theyaredominatedbyahardcomponentforwhichahigh-energycuto isobserved(Groveetal.,1998).Inthetimingdomain,thecomponentsobservedinthepowerdensityspectruminthesetwostatesareclearlyrelated,ascanbeseenfromtheevolutionoftheircharacteristicfrequencies(Bellonietal.,2004).Nevertheless,somethinghappenstotheaccretion owasthesourcemovesfromthelow/hardstatetotheintermediatestate,ascanbeseenfrommulti-wavelengthstudies(Homanetal.,2004a).Thisislikelytoberelatedto

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