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SUMMARY:Halo Occupation Distribution estimation for the upcoming LSST data
DTSTART;VALUE=DATE-TIME:20261019T084500Z
DTEND;VALUE=DATE-TIME:20261019T090000Z
DTSTAMP;VALUE=DATE-TIME:20261112T103445Z
UID:indico-contribution-2250@events.ncbj.gov.pl
DESCRIPTION:Speakers: Maria Antonela  Taverna (NCBJ)\nThe next generation 
 of surveys\, in particular the Rubin Observatory Legacy Survey of Space an
 d Time (LSST)\, will enable high signal-to-noise measurements of galaxy cl
 ustering across a broad range of environments and cosmic scales. The halo 
 occupation distribution (HOD) framework provides a powerful statistical li
 nk between galaxies and the dark matter structures and is key to testing g
 alaxy formation models and constraining cosmology. Robust methods to estim
 ate the HOD are therefore essential.\nIn this work\, we evaluate the perfo
 rmance of an HOD estimation algorithm tailored for deep photometric survey
 s. We extend a halo-based group finder\, originally designed to combine sp
 ectroscopic and photometric data\, to operate using imaging data and photo
 metric redshifts alone. Using a realistic mock galaxy survey from the cosm
 oDC2 catalogue\, we implement a background subtraction technique to mitiga
 te projection effects and apply an iterative centroiding method to improve
  group center identification.\n\nWe assess the method’s ability to recov
 er halo populations using completeness and purity metrics. Our results pro
 vide a quantitative benchmark for HOD reconstruction in LSST-like data\, d
 emonstrating the potential of photometric surveys to map halo population. 
 This approach contributes to ongoing efforts to connect galaxy populations
  to their evolving large-scale environments in the era of multiwavelength 
 survey synergy.\n\nhttps://events.ncbj.gov.pl/event/502/contributions/2250
 /
LOCATION:
URL:https://events.ncbj.gov.pl/event/502/contributions/2250/
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