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SUMMARY:Gravitational wave and electromagnetic signatures of binary black 
 holes with circumbinary gas - Zoltan Haiman
DTSTART:20260205T160000Z
DTEND:20260205T170000Z
UID:TALK242605@talks.cam.ac.uk
CONTACT:Jan Scholtz
DESCRIPTION:Binary black holes (BHBs) embedded in dense gas hold the\nprom
 ise of so-called "multi-messenger astrophysics": when they are\ndetected b
 oth through gravitational waves (GWs) and electromagnetic\n(EM) observatio
 ns\, they will enable novel science.  This is true both\nfor massive BHBs\
 , whose GWs will be detectable by the future LISA\nsatellite and by on-goi
 ng pulsar timing arrays (PTAs)\, as well as for\nstellar-mass BHBs detecte
 d through ground-based GW detectors.  In both\ncases\, identifying the coa
 lescing binaries through their EM signatures\nwill help clarify their astr
 ophysical origin and yield novel probes of\ncosmology\, fundamental physic
 s\, and accretion physics.  In this talk\,\nI will describe how circumbina
 ry gas may produce characteristic EM\nsignatures for both massive and stel
 lar-mass BHBs\, based on analytic\nmodels as well as hydrodynamical simula
 tions.  I will also argue that\nin both cases\, some coalescing binaries m
 ay have already been detected\nin optical surveys\, providing clues about 
 their origin.\n
LOCATION:Hoyle Lecture Theatre\, Institute of Astronomy
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