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Intracluster light is already abundant at redshift beyond unity
Hyungjin Joo1, M James Jee2,3
1Department of Astronomy, Yonsei University, Seoul, Republic of Korea.
Nature
|January 4, 2023
Summary
Intracluster light (ICL) is abundant in galaxy clusters at high redshift (z≳1), contrary to theoretical predictions. This study reveals a mean ICL fraction of 17% at these early cosmic times.
Area of Science:
- Cosmic evolution of galaxy clusters
- Extragalactic astronomy
- Stellar populations in the intracluster medium
Background:
- Intracluster light (ICL) is diffuse stellar light within galaxy cluster halos.
- Theoretical models predict a rapid decrease in ICL fraction with increasing redshift (z > 1).
- Previous observations at z > 1 yielded conflicting results due to limited sample sizes.
Purpose of the Study:
- To investigate the abundance and properties of ICL in galaxy clusters at higher redshifts (1 ≲ z ≲ 2).
- To test theoretical predictions regarding the evolution of the ICL fraction.
- To explore the relationship between ICL fraction, cluster mass, and ICL color.
Main Methods:
- Analysis of deep infrared imaging data from ten galaxy clusters.
- Measurement of the ICL fraction (ratio of ICL to total cluster light).
- Examination of ICL color as a function of cluster-centric radius.
Main Results:
- ICL is abundant at z ≳ 1, with a mean fraction of approximately 17%.
- No significant correlation was found between cluster mass and ICL fraction.
- No significant correlation was observed between ICL color and cluster-centric radius.
Conclusions:
- The findings contradict theories predicting a rapid decline in ICL fraction at high redshifts.
- Gradual stellar stripping is unlikely to be the primary mechanism for ICL formation.
- ICL production may be linked to the growth of brightest cluster galaxies or accretion of stray stars.
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