Angular Momenta, Dynamical Masses, And Mergers Of Brightest Cluster Galaxies
Abstract
Using the VIMOS integral field unit (IFU) spectrograph on the Very Large Telescope, we have spatially mapped the kinematic properties of 10 nearby brightest cluster galaxies (BCGs) and 4 BCG companion galaxies located within a redshift of z = 0.1. In the hierarchical formation model, these massive galaxies (10(10.5) M-circle dot < M-dyn < 10(11.9) M-circle dot) are expected to undergo more mergers than lower mass galaxies, and simulations show that dry minor mergers can remove angular momentum. We test whether BCGs have low angular momenta by using the lambda(Re) parameter developed by the SAURON and ATLAS(3D) teams and combine our kinematics with Sloan Digital Sky Survey photometry to analyze the BCGs' merger status. We find that 30% (3/10) of the BCGs and 100% of the companion galaxies (4/4) are fast rotators as defined by the ATLAS(3D) criteria. Our fastest rotating BCG has a lambda(Re) = 0.35 +/- 0.05. We increase the number of BCGs analyzed from 1 in the combined SAURON and ATLAS(3D) surveys to 11 BCGs total and find that above M-dyn similar to 11.5 M-circle dot, virtually all galaxies, regardless of environment, are slow rotators. To search for signs of recent merging, we analyze the photometry of each system and use the G - M-20 selection criteria to identify mergers. We find that 40% +/- 20% of our BCGs are currently undergoing or have recently undergone a merger (within 0.2 Gyr). Surprisingly, we find no correlation between galaxies with high angular momentum and morphological signatures of merging.
Department
Subject
galaxies: clusters: general
galaxies: elliptical and lenticular, cd
galaxies: evolution
galaxies: kinematics and dynamics
galaxies:
photometry
galaxies: structure
digital sky survey
to-light ratio
elliptic galaxies
fundamental
plane
atlas(3d) project
structural-properties
scaling relations
sauron project
slow rotators
dark-matter
astronomy & astrophysics
galaxies: elliptical and lenticular, cd
galaxies: evolution
galaxies: kinematics and dynamics
galaxies:
photometry
galaxies: structure
digital sky survey
to-light ratio
elliptic galaxies
fundamental
plane
atlas(3d) project
structural-properties
scaling relations
sauron project
slow rotators
dark-matter
astronomy & astrophysics
xmlui.dri2xhtml.METS-1.0.item-citation
Tran, Kim-Vy, Sarah Brough, Karl Gebhardt, Anja von der Linden, Warrick J. Couch, and Rob Sharp. "Angular Momenta, Dynamical Masses, and Mergers of Brightest Cluster Galaxies." The Astrophysical Journal, Vol. 778, No. 2 (Dec., 2013): 171.Collections
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