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SUMMARY:Finding the one: identifying the host of compact binary mergers
DTSTART:20260511T083000Z
DTEND:20260511T093000Z
DTSTAMP:20260530T234900Z
UID:indico-event-19@events.gw.iucaa.in
DESCRIPTION:Speakers: Abhishek Sharma (Inter-University Centre for Astrono
 my and Astrophysics\, Pune)\n\nFinding the host galaxies of stellar-mass c
 ompact binary mergers will open a new window for study-ing their formation
  histories and measuring key cosmological parameters\, such as the Hubble 
 constant. To date\, only one merger\, GW170817\, has had its host galaxy c
 onfidently identified through electro-magnetic counterpart observations. T
 he large localization volumes from the LIGO–Virgo–KAGRA (LVK) network\
 , combined with the lack of electromagnetic emission for most events\, mak
 e host iden-tification challenging. However\, as the sensitivity of the gr
 avitational-wave (GW) detector network improves\, events are becoming incr
 easingly well localized. Furthermore\, galaxy luminosity traces mass or st
 ar formation rate\, and thus correlates with the probability of hosting a 
 merger. Focusing on the most luminous galaxies within the localization vol
 umes of the best-localized GW events\, we estimate the corresponding Hubbl
 e constant for each galaxy by combining its redshift with the luminosity d
 is-tance inferred from LVK observations. For the well-localized LVK events
  S250207bg\, GW190814\, and S250830bp\, we find only 1\, 1\, and 4 galaxie
 s\, respectively\, when restricting the analysis to the most luminous 1% o
 f galaxies above Lth ∼ 1011h−2L⊙ in each event’s localization volu
 me and adopting a broad H0 prior. The probability of these galaxies being 
 random\, and not associated with the GW events\, is 29–36% across the th
 ree events. We encourage further follow-up observations of these candi-dat
 e host galaxies. We expect this approach to become increasingly powerful i
 n future LVK observing runs\, enabling constraints on merger formation his
 tories and measurements of the Hubble constant.\n \narXiv link:  https:/
 /arxiv.org/pdf/2604.28132\n\nhttps://events.gw.iucaa.in/event/19/
LOCATION:Lecture Hall/Bhaskara-1 (IUCAA\, Pune\, India)
URL:https://events.gw.iucaa.in/event/19/
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