skip to main content

SciTech ConnectSciTech Connect

Title: Photometric decomposition of mergers in disk galaxies

Several observational studies and numerical simulations suggest that mergers must contribute to the evolution of galaxies; however, the role that they play is not yet fully understood. In this paper we study a sample of 52 double nucleus disk galaxies that are considered as candidates for a minor merger event. The luminosity of each of the nuclei and their relative separation are derived from a multi-component photometric fit of the galaxies in the Sloan Digital Sky Survey optical images. We find that the nuclei in most of the sources have projected separations ≤4 kpc. The ratio of nuclear luminosities indicates that most of the systems are likely in the coalescence stage of a major merger. This is supported by the existence of a single galaxy disk in 65% of the systems studied and the finding of a correlation between nuclear luminosity and host luminosity for the single-disk systems: those sources fitted with as single disk are in a more evolved stage of the merger and present an enhancement of the nuclear luminosity compared to the double-disk systems, as expected from simulations of galaxy mergers. Finally, we identify a sample of 19 double nucleus disk galaxies in which the two nucleimore » are physically separated by ≤1 kpc and constitute thus a sample of sub-kpc binary active galactic nucleus candidates.« less
Authors:
;  [1] ;  [2] ;  [3]
  1. Instituto de Astrofísica de Canarias (IAC), E-38200 La Laguna, Tenerife (Spain)
  2. Max Planck Institute for Radio Astronomy, Auf dem Hügel 69, D-53121 Bonn (Germany)
  3. Center for the Exploration of the Origin of the Universe, Seoul National University, Seoul 151-742 (Korea, Republic of)
Publication Date:
OSTI Identifier:
22351532
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 784; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; COALESCENCE; COMPARATIVE EVALUATIONS; COMPUTERIZED SIMULATION; CORRELATIONS; EVOLUTION; GALAXIES; GALAXY NUCLEI; IMAGES; LUMINOSITY; PHOTOMETRY