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SUMMARY:Initial Investigations of the Outskirts of XLSSC 122
DTSTART;VALUE=DATE-TIME:20261028T182000Z
DTEND;VALUE=DATE-TIME:20261028T182100Z
DTSTAMP;VALUE=DATE-TIME:20261028T125621Z
UID:indico-contribution-3677@nyx.physics.mcgill.ca
DESCRIPTION:Speakers: Eleanore Todd (University of Victoria)\nWe investiga
 te the redshift 1.98 galaxy cluster XLSSC 122 using the Hubble Space Teles
 cope (HST) from the core of the cluster out to 3 Mpc\, a scale equivalent 
 to 10 times the R500 = 295 kpc radius. We present an expanded photometric 
 and spectroscopic catalogue of the cluster\, bringing the total number of 
 spectroscopically classified member galaxies to 74\, with 35 new member ga
 laxies added in the outer regions of the cluster. We compute the radial ga
 laxy number density profile in the cluster\, and observe no clear evidence
  of infalling groups or cosmic filaments. We observe a clear bimodal colou
 r relation in member galaxies\, with red fraction increasing towards the c
 luster centre. This rapid increase of red fraction upon infall is indicati
 ve of a fast quenching mechanism\, such as ram pressure stripping\, as gal
 axies enter the cluster centre. We fit a luminosity function to the cluste
 r members\, finding a similar low mass slope but fainter scale magnitude t
 han z = 1 clusters of similar temperature\, implying a similar galaxy evol
 ution rate to clusters at lower redshift. These findings indicate that XLS
 SC 122 is experiencing an evolutionary process not typically observed in h
 igh redshift clusters\, and is more similar to z = 0 clusters.\n\nhttps://
 nyx.physics.mcgill.ca/event/587/contributions/3677/
LOCATION:Online 
URL:https://nyx.physics.mcgill.ca/event/587/contributions/3677/
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