Predicting the Properties of the Remnants of Dissipative Galaxy Mergers

Abstract

We construct a physically motivated model for predicting the properties of the remnants of gaseous galaxy mergers, given the properties of the progenitors and the orbit. The model is calibrated using a large suite of SPH merger simulations. It implements generalized energy conservation while accounting for dissipative energy losses and star formation. The dissipative effects are evaluated from the initial gas fractions and from the orbital parameters via an "impulse" parameter, which characterizes the strength of the encounter. Given the progenitor properties, the model predicts the remnant stellar mass, half-mass radius, and velocity dispersion to an accuracy of 25%. The model is valid for both major and minor mergers. We provide an explicit recipe for semi-analytic models of galaxy formation.

arXiv comment14 pages, 9 figures. MNRAS accepted

References in corpus (23)

• The Global Schmidt Law in Star Forming Galaxies
• The Formation of Galactic Disks
• Hierarchical Galaxy Formation
• GADGET: A code for collisionless and gasdynamical cosmological simulations
• The size distribution of galaxies in the Sloan Digital Sky Survey
• A universal angular momentum profile for galactic halos
• Cosmological SPH simulations: The entropy equation
• The Nature of High-Redshift Galaxies
• The effect of galaxy mass ratio on merger--driven starbursts
• Formation of gas disks in merging galaxies
• Feedback in simulations of disc-galaxy major mergers
• The Fundamental Scaling Relations of Elliptical Galaxies
• Properties of Early-Type, Dry Galaxy Mergers and the Origin of Massive Elliptical Galaxies
• GALICS I: A hybrid N-body semi-analytic model of hierarchical galaxy formation
• Sunrise: Polychromatic Dust Radiative Transfer in Arbitrary Geometries
• A Revised Model for the Formation of Disk Galaxies: Low Spin and Dark-Halo Expansion
• The influence of gas on the structure of merger remnants
• Orbital Parameters of Merging Dark Matter Halos
• Red Mergers and the Assembly of Massive Elliptical Galaxies: the Fundamental Plane and its Projections
• The Importance of Dry and Mixed Mergers for Early-Type Galaxy Formation
• The importance of dry and wet merging on the formation and evolution of elliptical galaxies
• Simulations of Dust in Interacting Galaxies I: Dust Attenuation
• The Dissipative Merger Progenitors of Elliptical Galaxies

Cited by in corpus (35)

• Physical Models of Galaxy Formation in a Cosmological Framework
• From dwarf spheroidals to cDs: Simulating the galaxy population in a LCDM cosmology
• Formation of Massive Galaxies at High Redshift: Cold Streams, Clumpy Disks and Compact Spheroids
• How Do Disks Survive Mergers?
• How Do Massive Black Holes Get Their Gas?
• Galaxy Formation Theory
• Dissipation and Extra Light in Galactic Nuclei: IV. Evolution in the Scaling Relations of Spheroids
• Dissipation and Extra Light in Galactic Nuclei: II. 'Cusp' Ellipticals
• Forming a Large Disc Galaxy from a z<1 Major Merger
• Discriminating Between the Physical Processes that Drive Spheroid Size Evolution
• Size Evolution of Spheroids in a Hierarchical Universe
• Dissipation and Extra Light in Galactic Nuclei: III. 'Core' Ellipticals and 'Missing' Light
• The Relationship between Galaxy and Dark Matter Halo Size from z~3 to the present
• Dissipation and the Fundamental Plane: Observational Tests
• Understanding the Structural Scaling Relations of Early-Type Galaxies
• Galaxy Formation Spanning Cosmic History
• Wet Compaction to a Blue Nugget: a Critical Phase in Galaxy Evolution
• A First Look at Galaxy Flyby Interactions: I. Characterizing the Frequency of Flybys in a Cosmological Context
• Observational constraints on the co-evolution of supermassive black holes and galaxies
• The new semianalytic code GalICS 2.0 - Reproducing the galaxy stellar mass function and the Tully-Fisher relation simultaneously
• Evolution of the Stellar Mass Tully-Fisher Relation in Disk Galaxy Merger Simulations
• The central dark matter content of early-type galaxies: scaling relations and connections with star formation histories
• The Environmental Dependence of the Luminosity-Size Relation for Galaxies
• Numerical Simulations of Hot Halo Gas in Galaxy Mergers
• The Role of Dissipation in the Scaling Relations of Cosmological Merger Remnants
• A New Empirical Method to Infer the Starburst History of the Universe from Local Galaxy Properties
• Modeling the Ages and Metallicities of Early-Type Galaxies in Fundamental Plane Space
• Morphological evolution and galactic sizes in the L-Galaxies SA model
• The $z\lesssim 1$ drop of cosmic dust abundance in a semi-analytic framework
• Composite star formation histories of early-type galaxies from minor mergers: prospects for WFC3
• The Physical Origin of the Mass-Size Relation and Its Scatter of Disk Galaxies
• The weak dependence of velocity dispersion on disk fractions, mass-to-light ratio and redshift: Implications for galaxy and black hole evolution
• The Size Evolution of Elliptical Galaxies
• The relationship between galaxy and halo sizes in the Illustris and IllustrisTNG simulations
• Size-Mass Relation Shows Its Colours: Contrasting Physical Imprints of Galaxy Evolution in Rest-Frame UV and Optical