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CGCG 480-022: A distant lonesome merger?

AuthorsCarretero, C.; Vazdekis, A.; González-García, A. César ; Beckman, J. E.; Quilis, Vicente
Keywordsgalaxies: abundances
galaxies: individual (CGCG 480 022)
galaxies: interactions
galaxies: kinematics and dynamics
galaxies: structure
methods: n-body simulations
Instituto de Ciencias del Patrimonio
Institute of Heritage Sciences
Issue Date10-Sep-2006
PublisherInstitute of Physics Publishing
CitationThe Astrophysical Journal, 648 (2): L115-118. Bristol
Abstract[EN]We present a complete analysis, which includes morphology, kinematics, stellar populations, and N-body simulations, of CGCG 480-022, the most distant (cz = 14,317 km s-1) isolated galaxy studied so far in such detail. The results all support the hypothesis that this galaxy has suffered a major merger event with a companion of ~0.1 times its mass. Morphology reveals the presence of a circumnuclear ring and possibly further ring debris. The radial velocity curve looks symmetrical, while the velocity dispersion increases with radius, reaching values that do not correspond to a virialized system. Moreover, this galaxy deviates significantly from the fundamental plane and the Faber-Jackson relation. The stellar population analysis show that the ring is younger and more metal-rich, which suggest that it has undergone a fairly recent burst of star formation. Both morphological and dynamical results are in broad agreement with our N-body simulations.
Publisher version (URL)http://iopscience.iop.org/1538-4357/648/2/L115/fulltext/20903.text.html
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