Secular Evolution In Late Type Spiral Galaxies
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Author |
: Man-Hong Wong |
Publisher |
: |
Total Pages |
: 32 |
Release |
: 2010 |
ISBN-10 |
: OCLC:667706646 |
ISBN-13 |
: |
Rating |
: 4/5 (46 Downloads) |
Synopsis Secular Evolution in Late-type Spiral Galaxies by : Man-Hong Wong
Abstract: Galaxy evolution through internal rather than external processes is known as secular evolution. Evidence for secular evolution comes in various forms, most notably the development of a pseudobulge. Pseudobulges differ from merger-built bulges because they exhibit disk-like features. While the bulges of most spirals are best-fit by a Sersic surface brightness profile with index n = 4 (also known as a de Vaucouleurs r1/4 profile), pseudobulges typically have n = 1 - 3, where an n = 1 Sersic profile corresponds to a second exponential profile (in addition to the disk itself). We used the exponential surface brightness profile of pseudobulges to identify these components in our sample of 20 late-type spiral galaxies. Late-type disks are well-suited to study signs of secular evolution because any past interactions and mergers would have developed at least a small bulge and changed their classification. There is evidence that more massive disk galaxies may be more likely to drive mass inwards and produce a pseudobulge. We perform decompositions of the galaxies to find these features. We also study the the concentrations of polycyclic aromatic hydrocarbons (PAHs) as a function of mass because they have been shown to trace molecular gas, which is the fuel needed to form the stars that make up a pseudobulge. NGC2805, a lower-mass galaxy, was the only galaxy in our sample that has a pseudobulge. We also found no correlation between the central concentration of PAH emission and the mass. This implies that more massive galaxies are not more efficient at driving gas inwards.
Author |
: Xiaolei Zhang |
Publisher |
: Walter de Gruyter GmbH & Co KG |
Total Pages |
: 338 |
Release |
: 2017-12-04 |
ISBN-10 |
: 9783110527421 |
ISBN-13 |
: 3110527421 |
Rating |
: 4/5 (21 Downloads) |
Synopsis Dynamical Evolution of Galaxies by : Xiaolei Zhang
This research monograph presents a new dynamical framework for the study of secular morphological evolution of galaxies along the Hubble sequence. Classical approaches based on Boltzmann’s kinetic equation, as well as on its moment-equation descendants the Euler and Navier-Stokes fluid equations, are inadequate for treating the maintenance and long-term evolution of systems containing self-organized structures such as galactic density-wave modes. A global and synthetic approach, incorporating correlated fluctuations of the constituent particles during a nonequilibrium phase transition, is adopted to supplement the continuum treatment. The cutting-edge research combining analytical, N-body simulational, and observational aspects, as well as the fundamental-physics connections it provides, make this work a valuable reference for researchers and graduate students in astronomy, astrophysics, cosmology, many-body physics, complexity theory, and other related fields. Contents Dynamical Drivers of Galaxy Evolution N-Body Simulations of Galaxy Evolution Astrophysical Implications of the Dynamical Theory Putting It All Together Concluding Remarks Appendix: Relation to Kinetics and Fluid Mechanics
Author |
: R. S. de Jong |
Publisher |
: Springer Science & Business Media |
Total Pages |
: 605 |
Release |
: 2007-05-24 |
ISBN-10 |
: 9781402055737 |
ISBN-13 |
: 1402055730 |
Rating |
: 4/5 (37 Downloads) |
Synopsis Island Universes by : R. S. de Jong
This book contains an up-to-date review of the structure and evolution of disk galaxies from both the observational and theoretical point of view. It is the proceedings of the "Island Universes" conference held at the island of Terschelling in July 2005. It brings together a broad range of aspects of disk galaxies: structure and dynamics, the latest multi-wavelength surveys, low- and high redshift observations, theory and observations.
Author |
: |
Publisher |
: |
Total Pages |
: 18 |
Release |
: 2003 |
ISBN-10 |
: OCLC:227943771 |
ISBN-13 |
: |
Rating |
: 4/5 (71 Downloads) |
Synopsis Secular Evolution of Spiral Galaxies by :
It is now a well established fact that galaxies undergo significant morphological transformation during their lifetimes, manifesting as an evolution along the Hubble sequence from the late to the early Hubble types. The physical processes commonly believed to be responsible for this observed evolution trend, i.e. the major and minor mergers, as well as gas accretion under a barred potential, though demonstrated applicability to selected types of galaxies, on the whole have failed to reproduce the most important statical and internal properties of galaxies. The secular evolution mechanism reviewed in this paper has the potential to overcome most of the known difficulties of the existing theories to provide a natural and coherent explanation of the properties of present day as well as high-redshift galaxies.
Author |
: International Astronomical Union. Symposium |
Publisher |
: Cambridge University Press |
Total Pages |
: 510 |
Release |
: 2008-09-04 |
ISBN-10 |
: 052187467X |
ISBN-13 |
: 9780521874670 |
Rating |
: 4/5 (7X Downloads) |
Synopsis Formation and Evolution of Galaxy Bulges (IAU S245) by : International Astronomical Union. Symposium
Bulges lie at the heart of most galaxies, the building blocks of our universe. With a selection of reviews and topical presentations, IAU Symposium 245 provides an up-to-date overview of our knowledge on galaxy bulges, and a concise introduction to all current research on the subject. The structure, dynamics, and stellar populations of galaxy bulges, both near and far, are analysed through state-of-the-art observations. The leading models for the formation and evolution of galaxy bulges are described in detail, and the constraints observations put on these are dissected. Particular emphasis is placed on exploring evidence for both hierarchical merging and secular processes. Special attention is also devoted to disentangling the complex web relating galaxy bulges and central supermassive black holes, and on the lessons learned from our exquisite knowledge of the bulge of our own Milky Way. This volume is the best one-stop reference on galaxy bulges currently available.
Author |
: Kelly Foyle |
Publisher |
: |
Total Pages |
: 0 |
Release |
: 2010 |
ISBN-10 |
: OCLC:724420029 |
ISBN-13 |
: |
Rating |
: 4/5 (29 Downloads) |
Synopsis Spiral Arms and Their Effects on Secular Evolution and Star Formation in Disk Galaxies by : Kelly Foyle
Author |
: Jesús Falcón-Barroso |
Publisher |
: Cambridge University Press |
Total Pages |
: 657 |
Release |
: 2012 |
ISBN-10 |
: 9781107035270 |
ISBN-13 |
: 1107035279 |
Rating |
: 4/5 (70 Downloads) |
Synopsis Secular Evolution of Galaxies by : Jesús Falcón-Barroso
The formation and evolution of galaxies is one of the most important topics in modern astrophysics. Secular evolution refers to the relatively slow dynamical evolution due to internal processes induced by a galaxy's spiral arms, bars, galactic winds, black holes and dark matter haloes. It plays an important role in the evolution of spiral galaxies with major consequences for galactic bulges, the transfer of angular momentum, and the distribution of a galaxy's constituent stars, gas and dust. This internal evolution is in turn the key to understanding and testing cosmological models of galaxy formation and evolution. Based on the twenty-third Winter School of the Canary Islands Institute of Astrophysics, this volume presents reviews from nine world-renowned experts on the observational and theoretical research into secular processes, and what these processes can tell us about the structure and formation of galaxies. The volume provides a firm grounding for graduate students and early career researchers working on galactic dynamics and galaxy evolution.
Author |
: David L. Block |
Publisher |
: Springer Science & Business Media |
Total Pages |
: 890 |
Release |
: 2013-04-17 |
ISBN-10 |
: 9781402028625 |
ISBN-13 |
: 1402028628 |
Rating |
: 4/5 (25 Downloads) |
Synopsis Penetrating Bars through Masks of Cosmic Dust by : David L. Block
THE EDITORS: DAVID L. BLOCK AND KENNETH C. FREEMAN (SOC CO-CHAIRS), IVANIO PUERARI, ROBERT GROESS AND LIZ K. BLOCK 1. Harvard College Observatory, 1958 The past century has truly brought about an explosive period of growth and discovery for the physical sciences as a whole, and for astronomy in particular. Galaxy morphology has reached a renaissance . . The year: 1958. The date: October 1. The venue: Harvard College Observatory. The lecturer: Walter Baade. With amazing foresight, Baade penned these words: "Young stars, supergiants and so on, make a terrific splash - lots of light. The total mass of these can be very small compared to the total mass of the system". Dr Layzer then asked the key question: " . . . the discussion raises the point of what this classification would look like if you were to ignore completely all the Population I, and just focus attention on the Population II . . . " We stand on the shoulders of giants. The great observer E. E. Barnard, in his pioneering efforts to photograph the Milky Way, devoted the major part of his life to identifying and numbering dusty "holes" and dust lanes in our Milky Way. No one could have dreamt that the pervasiveness of these cosmic dust masks (not only in our Galaxy but also in galaxies at high redshift) is so great, that their "penetration" is truly one of the pioneering challenges from both space-borne telescopes and from the ground.
Author |
: Sidney Van den Bergh |
Publisher |
: Cambridge University Press |
Total Pages |
: 125 |
Release |
: 1998-04-16 |
ISBN-10 |
: 9780521623353 |
ISBN-13 |
: 0521623359 |
Rating |
: 4/5 (53 Downloads) |
Synopsis Galaxy Morphology and Classification by : Sidney Van den Bergh
A concise and up-to-date guide to the shape of galaxies and how they can be classified, by one of the pioneers of the field.
Author |
: Ioannis Andredakis |
Publisher |
: |
Total Pages |
: 138 |
Release |
: 1997 |
ISBN-10 |
: UOM:39015040075692 |
ISBN-13 |
: |
Rating |
: 4/5 (92 Downloads) |
Synopsis Spheroidal Components of Spiral Galaxies by : Ioannis Andredakis