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Investigation into the Spatial Distribution of AGN Companion Galaxies in Gravitationally Isolated Environments

Investigation into the Spatial Distribution of AGN Companion Galaxies in Gravitationally Isolated Environments

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Title: Investigation into the Spatial Distribution of AGN Companion Galaxies in Gravitationally Isolated Environments
Author: Sivasubramanium, Janakan
Abstract: Active galaxies are an important subclass of galaxies, distinguished by an energetic core driven by enhanced accretion onto a central supermassive black hole. However, this accretion mechanism inevitably opens up a problem: what source provides the gaseous fuel for black hole accretion? In this research project, we examine the possibility that these active galaxies have engaged in some form of galactic cannibalism of their neighbouring galaxies to acquire a fuel supply to power their cores. By using data from the Sloan Digital Sky Survey (SDSS), we conduct an environmental survey around active/non-active galaxies and map out the spatial distribution of their companions. Our results show that, in gravitationally isolated environments, the local environment (less than 0.5 Mpc) around active galaxies are seen to have a scarcity of neighbouring galaxies relative to the non-active control sample a possible indication of a history of mergers and consumptions.
Subject: Physics
Keywords: Active
Galaxies
Galaxy
AGN
AGNs
Spatial
Distribution
Companion
Companions
Neighbour
Neighbor
Environment
Supermassive
Black hole
Accretion
Fuel
Core
Merger
Consumption
Type: Electronic Thesis or Dissertation
Rights: Author owns copyright, except where explicitly noted. Please contact the author directly with licensing requests.
URI: http://hdl.handle.net/10315/35595
Supervisor: Robertis, Michael De
Degree: MSc - Master of Science
Program: Physics And Astronomy
Exam date: 2018-09-04
Publish on: 2018-11-21

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