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Author : Jens Verner Villumsen
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (223 download)
Download or read book SIMULATIONS OF GALAXY MERGERS written by Jens Verner Villumsen and published by . This book was released on 1982 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Rida A. M. T. Farouki
Publisher :
ISBN 13 :
Total Pages : 292 pages
Book Rating : 4.E/5 ( download)
Download or read book Simulations of Galaxy Mergers written by Rida A. M. T. Farouki and published by . This book was released on 1983 with total page 292 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Jens Verner Villumsen
Publisher :
ISBN 13 :
Total Pages : 132 pages
Book Rating : 4.:/5 (15 download)
Download or read book Simulation of Galaxy Mergers written by Jens Verner Villumsen and published by . This book was released on 1982 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Chi-hun Kim
Publisher : Stanford University
ISBN 13 :
Total Pages : 189 pages
Book Rating : 4.F/5 ( download)
Download or read book Galaxy Formation and Mergers with Stars and Massive Black Holes written by Chi-hun Kim and published by Stanford University. This book was released on 2011 with total page 189 pages. Available in PDF, EPUB and Kindle. Book excerpt: While mounting observational evidence suggests the coevolution of galaxies and their embedded massive black holes (MBHs), a comprehensive astrophysical understanding which incorporates both galaxies and MBHs has been missing. To tackle the nonlinear processes of galaxy formation, we develop a state-of-the-art numerical framework which self-consistently models the interplay between galactic components: dark matter, gas, stars, and MBHs. Utilizing this physically motivated tool, we present an investigation of a massive star-forming galaxy hosting a slowly growing MBH in a cosmological LCDM simulation. The MBH feedback heats the surrounding gas and locally suppresses star formation in the galactic inner core. In simulations of merging galaxies, the high-resolution adaptive mesh allows us to observe widespread starbursts via shock-induced star formation, and the interplay between the galaxies and their embedding medium. Fast growing MBHs in merging galaxies drive more frequent and powerful jets creating sizable bubbles at the galactic centers. We conclude that the interaction between the interstellar gas, stars and MBHs is critical in understanding the star formation history, black hole accretion history, and cosmological evolution of galaxies. Expanding upon our extensive experience in galactic simulations, we are well poised to apply this tool to other challenging, yet highly rewarding tasks in contemporary astrophysics, such as high-redshift quasar formation.
Author : Damien Chapon
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (8 download)
Download or read book Simulations of Binary Galaxy Mergers written by Damien Chapon and published by . This book was released on 2011 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Galaxy interactions and mergers are key events in the history of our Universe. Each one of them impacts the fragile equilibrium state of the galaxies, their morphology, their mass and star formation rate in a drastic way. Small scale physical processes play a major role during galaxy mergers: their complex interplay leads to high level of complexity and is far from being completely understood. In past numerical studies, the lack of resolution and of a consistent thermodynamical model for a multi-phase turbulent interstellar medium was one of the main caveat of galactic scale simulations. The aim of this thesis if to study the effect of galaxy collision and mergers on the small scale physical processes by using high-resolution numerical simulations. The AMR hydrodynamical code RAMSES used in this work is described in chapter 3, as well as the additional modules developed for the specific purpose of galaxy merger simulations. In chapter 4,1 will present a high-resolution Antennae galaxy (NGC4038/39) merger simulation. In this numerical study, the use of a "pseudo-cooling" thermodynamical model leaded to a merger-induced clustered starburst, in fair agreement with thé star formation properties in observed galaxies. Chapter 5 will focus on the formation of a super-massive black hole binary at the center of a nuclear disk resulting from an equal-mass galaxy merger simulation. The effect of dynamical friction by a gaseous medium on the SMBHs pairing process is properly resolved down to sub-parsec scales. Finally, a new data processing and visualization module called PyMSES co-developed specifically for the RAMSES data structure is introduced in chapter 6.
Author : L. Feretti
Publisher : Springer Science & Business Media
ISBN 13 : 0306480964
Total Pages : 329 pages
Book Rating : 4.3/5 (64 download)
Download or read book Merging Processes in Galaxy Clusters written by L. Feretti and published by Springer Science & Business Media. This book was released on 2006-04-18 with total page 329 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mergers are the mechanisms by which galaxy clusters are assembled through the hierarchical growth of smaller clusters and groups. Major cluster mergers are the most energetic events in the Universe since the Big Bang. Many of the observed properties of clusters depend on the physics of the merging process. These include substructure, shock, intra cluster plasma temperature and entropy structure, mixing of heavy elements within the intra cluster medium, acceleration of high-energy particles, formation of radio halos and the effects on the galaxy radio emission. This book reviews our current understanding of cluster merging from an observational and theoretical perspective, and is appropriate for both graduate students and researchers in the field.
Author : Maan H. Hani
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (129 download)
Download or read book Probing Galaxy Evolution Through Numerical Simulations written by Maan H. Hani and published by . This book was released on 2020 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Large observational surveys have compiled substantial galaxy samples with an array of different properties across cosmic time. While we have a broad understanding of how galaxies grow and build their observable properties, the details of galaxy growth and evolution pose a fundamental challenge to galaxy evolution theories. Nonetheless, galaxy evolution is ultimately regulated by the properties of the gas reservoir. In this thesis I use numerical simulations to answer key questions related to the galactic gas reservoir, and galaxy mergers: a major transformational process. In Chapter 2 I present an analysis of 28 simulated L* galaxies to understand the physical processes that shape the massive gas reservoir surrounding galaxies (i.e. the circum-galactic medium; CGM). I show that (1) the gas and metal content of the CGM is driven by galaxy growth and the strength/presence of feedback processes, and (2) the ionisation and internal structures of the CGM are shaped by galactic outflows, and active galactic nucleus luminosity. Albeit dependent on internal galactic properties and the physical processes that shape them, the CGM remains greatly diverse, thus posing a challenge for observational surveys. As a follow-up to my study of normal L* galaxy gas halos, in Chapter 3 I present a theoretical study of the effect of galaxy mergers on the CGM. I demonstrate that galaxy mergers can leave a strong imprint on the CGM's gas and metal content, metallicity, and size. The merger can increase (1) the CGM's metallicity by 0.2-0.3 dex within 0.5 Gyr post-merge, and (2) the metal covering fractions by factors of 2-3. In spite of the increase in the CGM's metal content, the hard ionising field during the merger can drive a decline in the covering fractions of commonly observed ions. In Chapter 4 I shift focus to star formation, particularly the effects of galaxy mergers on star formation. While the effects of galaxy mergers have been proven observationally, theoretical predictions are limited to small binary merger suites and cosmological zoom-in studies. I present a statistical study of 27,691 post-merger galaxies from IllustrisTNG to quantify the effect of galaxy mergers on galactic star formation. I report a dependence in the merger-induced star formation rate (SFR) on mass ratio, stellar mass, gas fraction, and galaxy SFR. I also track the evolution of the effects of galaxy mergers demonstrating their decay over ~500 Myr. In Chapter 6, I leverage galactic scaling relations to extend my work on the effects of galaxy mergers to resolved scales. However, before using the simulated resolved scaling relations, I first examine their existence and robustness. In Chapter 5, I demonstrate the emergence of the kpc-scale star forming main sequence (rSFMS) in the FIRE-2 simulations. Nonetheless, the slope of the rSFMS is dependent on the (1) star formation tracer's timescale, and (2) observed resolution, which I propose is caused by the clumpiness of star formation. I develop a toy model that quantitatively captures the effects of clumpy star formation. I then illustrate how the model can be used to characterise the mass of star-forming clumps. Having demonstrated the existence and robustness of known scaling relations in numerical simulations, I explore the effects of galaxy mergers on resolved scales in Chapter 6. I generate synthetic observations for 1,927 post-mergers in IllustrisTNG and examine the radially-dependent merger-driven SFR enhancement, and metallicity suppression in post-mergers. Galaxy mergers preferentially boost star formation in the centres and suppress metallicities globally. The effects of the merger depends on galaxy properties such as stellar mass, SFR, mass ratio, and gas fraction.
Author : Ji-hoon Kim
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (746 download)
Download or read book Galaxy Formation and Mergers with Stars and Massive Black Holes written by Ji-hoon Kim and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: While mounting observational evidence suggests the coevolution of galaxies and their embedded massive black holes (MBHs), a comprehensive astrophysical understanding which incorporates both galaxies and MBHs has been missing. To tackle the nonlinear processes of galaxy formation, we develop a state-of-the-art numerical framework which self-consistently models the interplay between galactic components: dark matter, gas, stars, and MBHs. Utilizing this physically motivated tool, we present an investigation of a massive star-forming galaxy hosting a slowly growing MBH in a cosmological LCDM simulation. The MBH feedback heats the surrounding gas and locally suppresses star formation in the galactic inner core. In simulations of merging galaxies, the high-resolution adaptive mesh allows us to observe widespread starbursts via shock-induced star formation, and the interplay between the galaxies and their embedding medium. Fast growing MBHs in merging galaxies drive more frequent and powerful jets creating sizable bubbles at the galactic centers. We conclude that the interaction between the interstellar gas, stars and MBHs is critical in understanding the star formation history, black hole accretion history, and cosmological evolution of galaxies. Expanding upon our extensive experience in galactic simulations, we are well poised to apply this tool to other challenging, yet highly rewarding tasks in contemporary astrophysics, such as high-redshift quasar formation.
Author : Gregory S. Novak
Publisher :
ISBN 13 :
Total Pages : 438 pages
Book Rating : 4.:/5 (79 download)
Download or read book Simulated Galaxy Remnants Produced by Binary and Multiple Mergers written by Gregory S. Novak and published by . This book was released on 2008 with total page 438 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Hydrodynamic Simulations of Cosmological Galaxy Merger Trees written by and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In this thesis we use cosmological merger trees and semi-analytic models of galaxy formation to provide the initial conditions for multi-merger hydrodynamic simulations. In this way we exploit the advantages of merger simulations (high resolution and detailed treatment of the gas physics) and semi-analytic models (cosmological background and low computational cost), and integrate them to create a novel tool. This approach allows us to study the evolution of various galaxy properties with an improved treatment of the gas components, including, for the first time, the hot gaseous halo from which gas cools and accretes onto the central disc. Using a suite of minor merger simulations we find that disc thickening is reduced relative to the collisionless case through the absorption of kinetic impact energy by the gas. In a following series of major merger simulations, we show that adding the hot gas component is a key ingredient in order to reproduce several observed properties of elliptical galaxies, like the abundance of fast rotators. Moreover, the presence of a gaseous halo reduces the starburst efficiency. We then focus on the effects of multiple concurrent mergers, which we found to be cosmologically more common than sequences of isolated binary mergers. For this, we investigate, whether accreted satellite stars can be distinguished kinematically from stars formed 'in situ' in the central galaxy, and find that this is only possible for a fraction of the disrupted satellites. Our simulations to date indicate that the combination of a detailed treatment of gas physics, high resolution, and a cosmological background, brings numerical simulations in better agreement with observations. Overall, the novel tool developed in this thesis will be very useful for pursuing a number of questions pertaining to the transformation of galaxy internal structure by mergers and accretion.
Author : Michael Robert Boylan-Kolchin
Publisher :
ISBN 13 :
Total Pages : 424 pages
Book Rating : 4.:/5 (35 download)
Download or read book Mergers of Elliptical Galaxies and Dark Matter Halos written by Michael Robert Boylan-Kolchin and published by . This book was released on 2006 with total page 424 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Eija Laurikainen
Publisher : Springer
ISBN 13 : 3319193783
Total Pages : 480 pages
Book Rating : 4.3/5 (191 download)
Download or read book Galactic Bulges written by Eija Laurikainen and published by Springer. This book was released on 2015-09-29 with total page 480 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book consists of invited reviews on Galactic Bulges written by experts in the field. A central point of the book is that, while in the standard picture of galaxy formation a significant amount of the baryonic mass is expected to reside in classical bulges, the question what is the fraction of galaxies with no classical bulges in the local Universe has remained open. The most spectacular example of a galaxy with no significant classical bulge is the Milky Way. The reviews of this book attempt to clarify the role of the various types of bulges during the mass build-up of galaxies, based on morphology, kinematics and stellar populations and connecting their properties at low and high redshifts. The observed properties are compared with the predictions of the theoretical models, accounting for the many physical processes leading to the central mass concentration and their destruction in galaxies. This book serves as an entry point for PhD students and non-specialists and as a reference work for researchers in the field.
Author :
Publisher :
ISBN 13 :
Total Pages : 4 pages
Book Rating : 4.:/5 (873 download)
Download or read book Galaxy Mergers with Adaptive Mesh Refinement written by and published by . This book was released on 2011 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: In hierarchical structure formation, merging of galaxies is frequent and known to dramatically affect their properties. To comprehend these interactions high-resolution simulations are indispensable because of the nonlinear coupling between pc and Mpc scales. To this end, we present the first adaptive mesh refinement (AMR) simulation of two merging, low mass, initially gas-rich galaxies (1.8 x 101° M{sub {circle_dot}} each), including star formation and feedback. With galaxies resolved by ≈ 2 x 107 total computational elements, we achieve unprecedented resolution of the multiphase interstellar medium, finding a widespread starburst in the merging galaxies via shock-induced star formation. The high dynamic range of AMR also allows us to follow the interplay between the galaxies and their embedding medium depicting how galactic outflows and a hot metal-rich halo form. These results demonstrate that AMR provides a powerful tool in understanding interacting galaxies.
Author : John A. Zuhone
Publisher :
ISBN 13 :
Total Pages : 298 pages
Book Rating : 4.:/5 (316 download)
Download or read book Simulations of Binary Galaxy Cluster Mergers written by John A. Zuhone and published by . This book was released on 2009 with total page 298 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Thomas J. Cox
Publisher :
ISBN 13 :
Total Pages : 364 pages
Book Rating : 4.:/5 (71 download)
Download or read book Star Formation and Feedback in Simulations of Interacting Galaxies written by Thomas J. Cox and published by . This book was released on 2004 with total page 364 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : John Negroponte
Publisher :
ISBN 13 :
Total Pages : 150 pages
Book Rating : 4.:/5 (397 download)
Download or read book Simulations of Merging Galaxies written by John Negroponte and published by . This book was released on 1982 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Claudia Del P. Lagos
Publisher : Springer Science & Business Media
ISBN 13 : 3319015265
Total Pages : 252 pages
Book Rating : 4.3/5 (19 download)
Download or read book The Physics of Galaxy Formation written by Claudia Del P. Lagos and published by Springer Science & Business Media. This book was released on 2013-10-15 with total page 252 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis addresses two of the central processes which underpin the formation of galaxies: the formation of stars and the injection of energy into the interstellar medium from supernovae, called feedback. In her work Claudia Lagos has completely overhauled the treatment of these processes in simulations of galaxy formation. Her thesis makes two major breakthroughs, and represents the first major steps forward in these areas in more than a decade. Her work has enabled, for the first time, predictions to be made which can be compared against new observations which probe the neutral gas content of galaxies, opening up a completely novel way to constrain the models. The treatment of feedback from supernovae, and how this removes material from the interstellar medium, is also likely to have a lasting impact on the field. Claudia Lagos Ph.D. thesis was nominated by the Institute for Computational Cosmology at Durham University as an outstanding Ph.D. thesis 2012.
