Galaxy Morphology and Classification

Each individual galaxy may be thought of as representing a deviation from some underlying ideal type. 'Classical morphology is useful because it succeeds to some extent in distinguishing galaxies which are physically different' ...

Author: Sidney Bergh

Publisher: Cambridge University Press

ISBN: 9780521623353

Category: Science

Page: 125

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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.
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Toward a New Millennium in Galaxy Morphology

QUANTIFYING MORPHOLOGICAL EVOLUTION FROM LOW TO HIGH REDSHIFTS ROBERTO G. ABRAHAM Institute of Astronomy, ... I will outline the various techniques used to quantify high-redshift galaxy morphology, highlight the aspects of the Hubble ...

Author: David L. Block

Publisher: Springer Science & Business Media

ISBN: 9789401141147

Category: Science

Page: 821

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South Africa - a land of paradigm shifts. A land where we are willing to leave behind the old, to bravely accept the new. What do we need to exit the dark ages in the morphology of galaxies? How prevalent is the cherishing of old concepts? Traditional morphology has been `mask-oriented', focusing on masks of dust and gas which may constitute only 5 percent of the dynamical mass of a galaxy. Some of the world's foremost astronomers flew to South Africa to address morphologically related issues at an International Conference, the proceedings of which are contained in this volume. Examine predicted extinction curves for primordial dust at high redshift. Stars evolve; why not dust? Read about the breakdown of the Hubble sequence at a redshift of one. Explore the morphology of rings; the mysteries of metal-rich globular clusters; vigorous star-formation in the Large Magellanic Cloud; the world of secular evolution, where galaxies change their shapes within one Hubble time. And much more. Examine a new kinematical classification scheme of the unmasked, dust-penetrated near-infrared images of spiral galaxies. This volume contains over 80 refereed contributions (including 18 in-depth keynote review articles), 40 pages of questions and answers, a panel discussion transcribed from tape and 24 colour plates. The volume is unique in that contributions from both high and low redshift experts are represented at a level readily accessible to postdoctoral students entering the exciting world of morphology - whether it be of the local, or more distant, Universe.
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Secular Evolution of Galaxies

KK04 argued that the Universe is in a state of transition, where secular evolution is becoming the dominant process of morphological change. Galaxy morphology is a classical subject with a rich history in astronomy.

Author: Jesús Falcón-Barroso

Publisher: Cambridge University Press

ISBN: 9781107035270

Category: Science

Page: 657

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Graduate-level text on galaxy evolution, one of the most popular research topics in astrophysics, with chapters contributed by leading astronomers.
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Morphological and Physical Classification of Galaxies

Morphology has been useful in spite of the fact that classification has been largely a subjective visual exercise. ... The following five points help to place the problems of galaxy morphology into a general perspective: 1.

Author: G. Longo

Publisher: Springer Science & Business Media

ISBN: 9789401125222

Category: Science

Page: 472

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The morphological scheme devised by Hubble and followers to classify galaxies has proven over many decades to be quite effective in directing our quest for the fundamental pa rameters describing the extragalactic manifold. This statement is however far more true for spirals than for ellipticals. Echoing the concluding remarks in Scott Tremaine's sum mary talk at the Princeton meeting on Structure and Dynamics of Elliptical Galaxies, "the Hubble classification of spirals is useful because many properties of spirals (gas con tent, spiral arm morphology, bulge prominence, etc. ) all correlate with Hubble time. By contrast, almost nothing correlates with the elliptical Hubble sequence El to E7. " During the last few years much effort has been put into the search for a more meaningful classification of ellipticals than Hubble's. Concomitantly, forwarded by some provocative conjectures by R. Michard, the classical question of whether E galaxies form a physically homogeneous family has been brushed up once more. Results of these and other parallel studies look rather promising and point to suture part of the dichotomy between ellipticals and disk galaxies which had become popular in the early eighties, owing to dynamical arguments. At the same time it appears more and more clear that, besides the usual genetic varieties of galaxies, products of environmental evolution must also be contemplated in building our modern picture of the "reign of galaxies" . The above considerations prompted us to solicit Prof.
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Cosmic Pinwheels Spiral Galaxies And The Universe

... 353 exponential disks, 120 extinction, extragalactic, 20, 53, 64, 147, 148, 149, 417 extinction, Galactic, 169, ... 101 galaxy morphology, Lundmark classification, 112 galaxy morphology, Morgan classification, 113 galaxy morphology, ...

Author: Ronald J Buta

Publisher: World Scientific

ISBN: 9789811216701

Category: Science

Page: 488

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The main goal of the book is to introduce the reader to the world of spiral galaxies, how spirals were discovered, what they represent from a physical point of view, and what people have learned about the universe and the nature of galaxies in general from the study of spirals. Topics include early discoveries of nebulae, the island universe concept, the structure of spirals as seen both visually with telescopes and in images obtained with different filters, the role of spirals in the discovery of interstellar dust and dark matter, the different kinds of spiral galaxies and the importance of bars and rings, how different non-spiral galaxy types such as elliptical galaxies and S0 galaxies connect to spirals, and how spirals have contributed to our understanding of star formation and evolution, galaxy formation and evolution, the cosmological distance scale, and the universal expansion. The Milky Way as a spiral galaxy is also discussed.The book is profusely illustrated and not only a discourse on the spirals, but is also a personal reminiscence based on the author's studies of spiral galaxies over the past 45 years.
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Atlas of Galaxies

The previous sections covered practical issues of galaxy classification and morphology, all of which are essential to the construction of a meaningful, modern galaxy atlas. Nevertheless, the principal goal of morphological studies has ...

Author: Ronald J. Buta

Publisher: Cambridge University Press

ISBN: 9780521820486

Category: Science

Page: 357

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New illustrated atlas on modern galaxy classification for astronomy researchers, students, and amateurs.
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The World of Galaxies

Proceedings of the Conference “Le Monde des Galaxies” Held 12–14 April 1988 at the Institut d'Astrophysique de Paris ... Galaxy. Morphology. and. Classification. Ronald Buta Department of Astronomy, University of Texas, Austin, Texas, ...

Author: Harold G. Corwin

Publisher: Springer Science & Business Media

ISBN: 9781461393566

Category: Science

Page: 570

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From 12 April to 14 April 1988, 120 of Gerard and Antoinette de Vaucouleurs's friends and colleagues gathered at the Institut d' Astrophysique in Paris to cel ebrate Gerard's 70th birthday and his remarkable career in Astronomy. The gathering also honored the memory of Antoinette (who died 29 August 1987 after a long illness) and her own no less remarkable career. This volume collects the 24 invited review papers and the 60 contributed poster papers presented at the meeting. Gerard de Vaucouleurs Gerard de Vaucouleurs was born on 25 April 1918 in Paris, where he spent his boyhood. He became an active amateur astronomer in the early 1930's, making extensive observations of Mars, Jupiter, and variable stars (including the bright supernova of 1937 in IC 4182). He also began life-long interests in astronomical photography and galaxy cataloguing during this period. In 1939, he met the director of the Paris transport system and an equally avid amateur astronomer, Julien Peridier. De Vaucouleurs worked at Peridier's private observatory at Le Houga in southwestern France on and off throughout the next decade. His undergraduate work was in mathematics, astronomy, and experimental physics; this, combined with his interest in observational astronomy, formed his life-long empirical approach to science. After spending 18 months in the French army early in 1939 - 41, Gerard returned to the Peridier observatory and then, in 1943, to his studies at the Sorbonne, where he met Antoinette.
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Image Analysis and Processing ICIAP 2022

The minijpas survey: star-galaxy classification using machine learning. Astron. Astrophys. 645, A87 (2021). https://doi.org/10.1051/0004-6361/ 202038986 3. Barchi, P., et al.: Machine and deep learning applied to galaxy morphology - a ...

Author: Stan Sclaroff

Publisher: Springer Nature

ISBN: 9783031064272

Category: Computers

Page: 816

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The proceedings set LNCS 13231, 13232, and 13233 constitutes the refereed proceedings of the 21st International Conference on Image Analysis and Processing, ICIAP 2022, which was held during May 23-27, 2022, in Lecce, Italy, The 168 papers included in the proceedings were carefully reviewed and selected from 307 submissions. They deal with video analysis and understanding; pattern recognition and machine learning; deep learning; multi-view geometry and 3D computer vision; image analysis, detection and recognition; multimedia; biomedical and assistive technology; digital forensics and biometrics; image processing for cultural heritage; robot vision; etc.
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Encyclopedia of Astronomy Astrophysics

Dressler's galaxy morphology–local density relation. Plotted are the fractions of E, S0 and Sp + Irr galaxies as a function of the logarithm of the local projected galaxy density (see text for details). The upper histogram shows the ...

Author: P Murdin

Publisher: CRC Press

ISBN: 9781000523034

Category: Science

Page: 328

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In a unique collaboration, Nature Publishing Group and Institute of Physics Publishing have published the most extensive and comprehensive reference work in astronomy and astrophysics. This unique resource covers the entire field of astronomy and astrophysics and this online version includes the full text of over 2,750 articles, plus sophisticated search and retrieval functionality and links to the primary literature. The Encyclopaedia's authority is assured by editorial and advisory boards drawn from the world's foremost astronomers and astrophysicists. This first class resource is an essential source of information for undergraduates, graduate students, researchers and seasoned professionals, as well as for committed amateurs, librarians and lay people wishing to consult the definitive astronomy and astrophysics reference work.
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Unveiling Galaxies

Paraphrasing de Vaucouleurs' perspective on galaxy shapes, the authors stated that one should avoid seeing sharp boundaries between the morphological classes of the galaxies. This is the same idea of “continuity” emphasized by Sandage ...

Author: Jean-René Roy

Publisher: Cambridge University Press

ISBN: 9781108417013

Category: Nature

Page: 311

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A thought provoking study of the powerful impact of images in guiding astronomers' understanding of galaxies through time.
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