Cluster Mergers Induce Faint Galaxy Deficit In Luminosity Functions

Details Cluster Mergers Induce Faint Galaxy Deficit In Luminosity Functions Cluster Mergers Induce Faint Galaxy Deficit In Luminosity Functions

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21944111y&link_type=abstract

American Astronomical Society, AAS Meeting #219, #441.11

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Recent surveys revealed curious deficit of faint galaxies (Mv > -18) in the luminosity functions (LFs) of cluster galaxies, compared to the LFs of field counterparts. Based on cosmological N-body simulations and a new GPU-based halo-finding scheme, we here present an explanation for the discrepancy in LFs of galaxies belonging to dense and rarified environments. In particular, we show that dynamical interactions among clusters of galaxies have (a) accelerated preferentially less-massive galaxies and (b) thus forced the low-mass galaxies to escape from the host cluster's potential well, leaving the faint deficit in the LFs. Many of the escaped galaxies become part of field environments for as long as a few Gyrs. In light of the scenario, we discuss the cause of the observed similarities between cluster and field galaxies in terms of stellar populations (e.g., star formation rate) and dynamics (e.g., the disk warp phenomenon).

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