Real galaxy mergers from galaxy pair catalogs

Abstract

Mergers of galaxies are extremely violent events shaping their evolution. Such events are thought to trigger starbursts and, possibly, black hole accretion. Nonetheless, it is still not clear how to know the fate of a galaxy pair from the data available at a given time, limiting our ability to constrain the exact role of mergers. In this paper we use the lightcone of the Horizon-AGN simulation, for which we know the fate of each pair, to test three selection processes aiming at identifying true merging pairs. We find that the simplest one (selecting objects within two thresholds on projected distance $d$ and redshift difference $\Delta z$) gives similar results than the most complex one (based on a neural network analyzing $d$, $\Delta z$, redshift of the primary, masses/star formation rates/aspect ratio of both galaxies). Our best thresholds are $d_{\mathrm{th}}\sim 100\mathrm{kpc}$ and $\Delta z_{\mathrm{th}}\sim 10^{-3}$, in agreement with recent results.

submitted to MNRAS

References in corpus (55)

• Adam: A Method for Stochastic Optimization
• Seven-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
• Energy input from quasars regulates the growth and activity of black holes and their host galaxies
• Introducing the Illustris Project: Simulating the coevolution of dark and visible matter in the Universe
• Cosmological Hydrodynamics with Adaptive Mesh Refinement: a new high resolution code called RAMSES
• Gasdynamics and Starbursts in Major Mergers
• Radiative Transfer in a Clumpy Universe: II. The Utraviolet Extragalactic Background
• Dancing in the dark: galactic properties trace spin swings along the cosmic web
• Cosmological simulations of the growth of supermassive black holes and feedback from active galactic nuclei: method and tests
• The Merger Rates and Mass Assembly Histories of Dark Matter Haloes in the Two Millennium Simulations
• A Direct Measurement of Major Galaxy Mergers at z < 3
• The Asymmetry of Galaxies: Physical Morphology for Nearby and High Redshift Galaxies
• The effect of galaxy mass ratio on merger--driven starbursts
• The Horizon-AGN simulation: morphological diversity of galaxies promoted by AGN feedback
• The Evolution of Galaxy Mergers and Morphology at z<1.2 in the Extended Groth Strip
• Self-regulated growth of supermassive black holes by a dual jet/heating AGN feedback mechanism: methods, tests and implications for cosmological simulations
• The origin and implications of dark matter anisotropic cosmic infall on ~L* haloes
• Hubble Space Telescope imaging of the CFRS and LDSS redshift surveys - IV. Influence of mergers in the evolution of faint field galaxies from z~1
• The Romulus Cosmological Simulations: A Physical Approach to the Formation, Dynamics and Accretion Models of SMBHs
• AGN-driven quenching of star formation: morphological and dynamical implications for early-type galaxies
• The cosmic evolution of massive black holes in the Horizon-AGN simulation
• The History of the Baryon Budget: Cosmic Logistics in a Hierarchical Universe
• Building Merger Trees from Cosmological N-body Simulations
• Dissipation and Extra Light in Galactic Nuclei: II. 'Cusp' Ellipticals
• Understanding Dual AGN Activation in the Nearby Universe
• European Pulsar Timing Array Limits on Continuous Gravitational Waves from Individual Supermassive Black Hole Binaries
• The Horizon-AGN simulation: evolution of galaxy properties over cosmic time
• On the Life and Death of Satellite Haloes
• Growth and activity of black holes in galaxy mergers with varying mass ratios
• Hydrodynamical simulations of cluster formation with central AGN heating
• Galaxy Interactions Trigger Rapid Black Hole Growth: an unprecedented view from the Hyper Suprime-Cam Survey
• Photometric redshifts from SDSS images using a Convolutional Neural Network
• Observational constraints on the merger history of galaxies since $z\approx 6$: Probabilistic galaxy pair counts in the CANDELS fields
• COSMOS2015 photometric redshifts probe the impact of filaments on galaxy properties
• Off the Beaten Path: A New Approach to Realistically Model The Orbital Decay of Supermassive Black Holes in Galaxy Formation Simulations
• Massive black hole binaries: dynamical evolution and observational signatures
• Dissipation and Extra Light in Galactic Nuclei: III. 'Core' Ellipticals and 'Missing' Light
• Multimessenger Signatures of Massive Black Holes in Dwarf Galaxies
• The erratic dynamical life of black hole seeds in high-redshift galaxies
• High-redshift major mergers weakly enhance star formation
• The COSMOS2015 galaxy stellar mass function: 13 billion years of stellar mass assembly in 10 snapshots
• Massive Close Pairs Measure Rapid Galaxy Assembly in Mergers at High Redshift
• The SAMI Galaxy Survey: First detection of a transition in spin orientation with respect to cosmic filaments in the stellar kinematics of galaxies
• Mergers drive spin swings along the cosmic web
• A Fossil Record of Galaxy Encounters
• Wandering Supermassive Black Holes in Milky Way Mass Halos
• Automated Distant Galaxy Merger Classifications from Space Telescope Images using the Illustris Simulation
• Major mergers are not significant drivers of star formation or morphological transformation around the epoch of peak cosmic star formation
• New criteria for the selection of galaxy close pairs from cosmological simulations: evolution of the major and minor merger fraction in MUSE deep fields
• The birth of a supermassive black hole binary
• A Physical Approach to the Identification of High-z Mergers: Morphological Classification in the Stellar Mass Domain
• Merger induced clump formation in distant infrared luminous starburst galaxies
• An artificial neural network to discover Hypervelocity stars: Candidates in Gaia DR1/TGAS
• Weak lensing in the Horizon-AGN simulation lightcone. Small scale baryonic effects
• ASKI: full-sky lensing map making algorithms

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• Galaxy pairs in the Sloan Digital Sky Survey -- XIV. Galaxy mergers do not lie on the Fundamental Metallicity Relation
• Halo Growth and Merger Rates as a Cosmological Test
• EMERGE: Constraining merging probabilities and timescales of close galaxy pairs
• Astrophysics with the Laser Interferometer Space Antenna
• Environmental processing of galaxies in HI-rich groups