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| The '''Hubble sequence''' is a [[galaxy morphological classification|morphological classification scheme]] for [[Galaxy|galaxies]] invented by [[Edwin Hubble]] in 1936.<ref name="hubble26a">{{cite journal |last=Hubble |first=E. P. |authorlink=Edwin Hubble |year=1926 |title=Extra-galactic nebulae |journal=Contributions from the Mount Wilson Observatory / Carnegie Institution of Washington |volume=324 |pages=1–49|bibcode = 1926CMWCI.324....1H }}</ref><ref name="hubble26">{{cite journal |last=Hubble |first=E. P. |authorlink=Edwin Hubble |year=1926 |title=Extra-galactic nebulae |journal=Astrophysical Journal |volume=64 |pages=321–369 |bibcode= 1926ApJ....64..321H|doi = 10.1086/143018 }}</ref><ref name="hubble27" /><ref name="hubble">{{cite book |last=Hubble |first=E. P. |authorlink=Edwin Hubble |title=The Realm of the Nebulae |year=1936 |publisher=Yale University Press |location=New Haven |isbn=36018182}}</ref> It is often known colloquially as the '''Hubble [[tuning-fork]] diagram''' because of the shape in which it is traditionally represented.
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| Hubble’s scheme divides regular galaxies into 3 broad classes - [[elliptical galaxy|ellipticals]], [[lenticular galaxy|lenticulars]] and [[spiral galaxy|spirals]] - based on their visual appearance (originally on [[photographic plate]]s). A fourth class contains galaxies with an [[irregular galaxy|irregular]] appearance. To this day, the Hubble sequence is the most commonly used system for classifying galaxies, both in professional astronomical research and in [[amateur astronomy]].
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| ==Classes of galaxies==
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| ===Ellipticals===
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| | | <ul> |
| [[Image:Abell S740, cropped to ESO 325-G004.jpg|thumb|The giant elliptical galaxy ESO 325-G004.]]
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| On the left (in the sense that the sequence is usually drawn) lie the [[elliptical galaxy|ellipticals]]. Elliptical galaxies have smooth, featureless light distributions and appear as ellipses in photographic images. They are denoted by the letter E, followed by an integer <math>n</math> representing their degree of ellipticity on the sky. By convention, <math>n</math> is ten times the ellipticity of the galaxy, rounded to the nearest integer, where the ellipticity is defined as <math>\begin{matrix} e = 1-\frac{b}{a}\end{matrix}</math> for an ellipse with semi-major and semi-minor axes of lengths <math>a</math> and <math>b</math> respectively.<ref name="binney_merrifield">{{cite book |last=Binney |first=J. |authorlink=James Binney |coauthors=Merrifield, M. |title=Galactic Astronomy |year=1998 |publisher=Princeton University Press |location=Princeton |isbn=978-0-691-02565-0}}</ref> The ellipticity increases from left to right on the Hubble diagram, with near-circular (E0) galaxies situated on the very left of the diagram. It is important to note that the ellipticity of a galaxy on the sky is only indirectly related to the true 3-dimensional shape (for example, a flattened, discus-shaped galaxy can appear almost round if viewed face-on or elliptical if viewed at an angle). Observationally, the most flattened elliptical galaxies have ellipticities e=0.7 (denoted E7). This is consistent with their being truly [[ellipsoid]]al structures rather than disks viewed at a range of angles.
| | <li>[http://www.think-group.cn/VK/blog/article.php?type=blog&cid=4&itemid=1713736 http://www.think-group.cn/VK/blog/article.php?type=blog&cid=4&itemid=1713736]</li> |
| | | |
| Examples of elliptical galaxies: [[Messier 49|M49]], [[Messier 59|M59]], [[Messier 60|M60]], [[Messier 87|M87]], [[NGC 4125]].
| | <li>[http://audeladeleau.free.fr/spip.php?article11/ http://audeladeleau.free.fr/spip.php?article11/]</li> |
| | | |
| {{see also|Elliptical galaxy}}
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| | | |
| ===Spirals===
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| [[Image:M101 hires STScI-PRC2006-10a.jpg|thumb|The [[Pinwheel Galaxy]] (Messier 101/NGC 5457): a spiral galaxy classified as type Scd on the Hubble sequence]] | | |
| [[Image:Hubble2005-01-barred-spiral-galaxy-NGC1300.jpg|thumb|right|The barred spiral galaxy [[NGC 1300]]: a type SBbc]]
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| On the right of the Hubble sequence diagram are two parallel branches encompassing the [[spiral galaxy|spiral galaxies]]. A spiral galaxy consists of a flattened [[galaxy disk|disk]], with [[star]]s forming a (usually two-armed) [[spiral]] structure, and a central concentration of stars known as the [[bulge (astronomy)|bulge]]. Roughly half of all spirals are also observed to have a bar-like structure, extending from the central bulge, at the ends of which the spiral arms begin. In the tuning-fork diagram, the regular spirals occupy the upper branch and are denoted by the letter S, while the lower branch contains the barred spirals, given the symbol SB. Both type of spirals are further subdivided according to the detailed appearance of their spiral structures. Membership of one of these subdivisions is indicated by adding a lower-case letter to the morphological type, as follows:
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| | | </ul> |
| *Sa (SBa) - tightly-wound, smooth arms; large, bright central bulge
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| *Sb (SBb) - less tightly-wound spiral arms than Sa (SBa); somewhat fainter bulge
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| *Sc (SBc) - loosely wound spiral arms, clearly resolved into individual stellar clusters and nebulae; smaller, fainter bulge
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| Hubble originally described three classes of spiral galaxy. This was extended by [[Gerard de Vaucouleurs|de Vaucouleurs]]<ref name="devaucouleurs">{{cite journal |last=de Vaucouleurs |first=G. |authorlink=Gerard de Vaucouleurs |year=1959 |title=Classification and Morphology of External Galaxies |journal=Handbuch der Physik |volume=53 |pages=275 |bibcode=1959HDP....53..275D |last2=Oemler |first2=Augustus, Jr. |last3=Butcher |first3=Harvey R. |last4=Gunn |first4=James E.}}</ref> to include a fourth class:
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| *Sd (SBd) - very loosely-wound, fragmentary arms; most of the luminosity is in the arms and not the bulge
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| Although strictly part of the [[galaxy morphological classification|de Vaucouleurs system]] of classification, the Sd class is often included in the Hubble sequence. The basic spiral types can be extended to enable finer distinctions of appearance. For example, spiral galaxies whose appearance is intermediate between two of the above classes are often identified by appending 2 lower-case letters to the main galaxy type (for example56 Sbc for a galaxy that is intermediate between an Sb and an Sc).
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| Our own [[Milky Way Galaxy|Milky Way]] is generally classed as SBb, making it a barred spiral with well-defined arms. However, this classification is somewhat uncertain since we can only infer how our galaxy would appear to an outside observer.
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| Examples of regular spiral galaxies: [[Andromeda Galaxy|M31]] (Andromeda Galaxy), [[Messier 74|M74]], [[Messier 81|M81]], [[Sombrero Galaxy|M104]] (Sombrero Galaxy), [[Whirlpool Galaxy|M51a]] (Whirlpool Galaxy), [[NGC 300]], [[NGC 772]].
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| Examples of barred spiral galaxies: [[Messier 91|M91]], [[Messier 95|M95]], [[NGC 1097]], [[NGC 1300]], [[NGC1672]], [[NGC 2536]], [[NGC 2903]].
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| {{see also|Spiral galaxy}}
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| ===Lenticulars===
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| [[Image:Ngc5866 hst big rotated.jpg|thumb|The [[NGC 5866|Spindle Galaxy]] (NGC 5866), a lenticular galaxy with a prominent dust lane in the [[Draco (constellation)|constellation of Draco]].]]
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| At the centre of the Hubble tuning fork, where the two spiral arms meet the elliptical branch lies an intermediate class of galaxies known as [[lenticular galaxy|lenticulars]] and given the symbol S0. These galaxies consist of a bright central [[bulge (astronomy)|bulge]], similar in appearance to an [[elliptical galaxy]], surrounded by an extended, [[galaxy disk|disk]]-like structure. Unlike [[spiral galaxy|spiral galaxies]], the disks of lenticular galaxies have no visible spiral structure and are not actively forming stars in any significant quantity. The bulge component is often the dominant source of light in a lenticular galaxy.<ref>
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| {{cite journal |last=Graham |first=A. |coauthors=Worley, C. |date=August 2008 |title=Inclination- and dust-corrected galaxy parameters: bulge-to-disc ratios and size-luminosity relations |journal=Monthly Notices of the Royal Astronomical Society |volume=388 |issue=4 |pages=1708–1728 |bibcode=2008MNRAS.388.1708G |doi=10.1111/j.1365-2966.2008.13506.x|arxiv = 0805.3565 }}</ref>
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| Face-on lenticulars are difficult to distinguish from ellipticals of type E0, making the classification of many such galaxies uncertain. When viewed edge-on, prominent dust-lanes are sometimes visible in [[absorption (electromagnetic radiation)|absorption]] against the light of stars in the disk.
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| At the time of the initial publication of Hubble's galaxy classification scheme, the existence of lenticular galaxies was purely hypothetical. Hubble believed that they were necessary as an intermediate stage between the highly-flattened ellipticals and spirals. Later [[observational astronomy|observations]] (by Hubble himself, among others) showed Hubble's belief to be correct and the S0 class was included in the definitive exposition of the Hubble sequence by [[Allan Sandage]].<ref name="sandage">{{cite conference |first = A. |last = Sandage |authorlink = Allan Sandage |year = 1975 |title = Classification and Stellar Content of Galaxies Obtained from Direct Photography |booktitle = Galaxies and the Universe |editor = A. Sandage |others = M. Sandage and J. Kristian |url = http://nedwww.ipac.caltech.edu/level5/Sandage/frames.html |accessdate = 2007-11-20
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| }}</ref>
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| Lenticular and spiral galaxies, taken together, are often referred to as [[disk galaxy|disk galaxies]].
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| Examples of lenticular galaxies: [[Messier 85|M85]], [[Messier 86|M86]], [[NGC 1316]], [[NGC 2787]], [[NGC 5866]], [[Centaurus A]].
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| {{see also|Lenticular galaxy}}
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| ===Irregulars===
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| [[Image:large.mc.arp.750pix.jpg|thumb|The [[Large Magellanic Cloud]] (LMC) - a dwarf [[irregular galaxy]]]]
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| Galaxies that do not fit into the Hubble sequence, because they have no regular structure (either disk-like or ellipsoidal), are termed [[irregular galaxy|irregular galaxies]]. Hubble defined two classes of irregular galaxy:<ref name="longair">{{cite book |last=Longair |first=M. S. |authorlink=Malcolm Longair |title=Galaxy Formation |year=1998 |publisher=Springer |location=New York |isbn=3-540-63785-0}}</ref>
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| *Irr I galaxies have asymmetric profiles and lack a central bulge or obvious spiral structure; instead they contain many individual clusters of young stars
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| *Irr II galaxies have smoother, asymmetric appearances and are not clearly resolved into individual stars or stellar clusters
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| In his extension to the Hubble sequence, de Vaucouleurs called the Irr I galaxies 'Magellanic irregulars', after the [[Magellanic Clouds]] - two satellites of the Milky Way which Hubble classified as Irr I. The discovery of a faint spiral structure<ref>{{cite journal |last=de Vaucouleurs |first=G. |authorlink=Gérard de Vaucouleurs |year=1955 |title=Studies of Magellanic Clouds. I. Dimensions and structure of the Large Cloud |journal=The Astronomical Journal |volume=160 |pages=126–140 |bibcode=1955AJ.....60..126D |doi=10.1086/107173 |last2=Oemler |first2=Augustus, Jr. |last3=Butcher |first3=Harvey R. |last4=Gunn |first4=James E.}}</ref> in the [[Large Magellanic Cloud]] led de Vaucouleurs to further divide the irregular galaxies into those that, like the LMC, show some evidence for spiral structure (these are given the symbol Sm) and those that have no obvious structure, such as the [[Small Magellanic Cloud]] (denoted Im). In the extended Hubble sequence, the Magellanic irregulars are usually placed at the end of the spiral branch of the Hubble tuning fork.
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| Examples of irregular galaxies: [[Messier 82|M82]], [[NGC 1427A]], [[Large Magellanic Cloud]], [[Small Magellanic Cloud]].
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| {{see also|Irregular galaxy}}
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| ==Physical significance==
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| Elliptical and lenticular galaxies are commonly referred to together as “early-type” galaxies, while spirals and irregular galaxies are referred to as “late types”. This nomenclature is the source of the common,<ref>{{cite journal |last=Baldry |first=I. K. |year=2008 |title=Hubble's Galaxy Nomenclature |journal=Astronomy & Geophysics |volume=49 |issue=5 |pages=5.25 |doi=10.1111/j.1468-4004.2008.49525.x |bibcode=2008A&G....49e..25B|arxiv = 0809.0125 }}</ref> but erroneous, belief that the Hubble sequence was intended to reflect a supposed [[evolution (term)|evolutionary]] sequence, from [[elliptical galaxy|elliptical galaxies]] through [[lenticular galaxy|lenticulars]] to either [[barred spiral galaxy|barred]] or [[spiral galaxy|regular spirals]]. In fact, Hubble was clear from the beginning that no such interpretation was implied:
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| <blockquote>
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| The nomenclature, it is emphasized, refers to position in the sequence, and temporal connotations are made at one's peril. The entire classification is purely empirical and without prejudice to theories of evolution...<ref name="hubble27">{{cite journal |last=Hubble |first=E. P. |authorlink=Edwin Hubble |year=1927 |title=The Classification of Spiral Nebulae |journal=The Observatory |volume=50 |pages=276 |bibcode=1927Obs....50..276H}}</ref>
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| </blockquote> | |
| The evolutionary picture appears to be lent weight by the fact that the disks of spiral galaxies are observed to be home to many young [[star]]s and regions of active [[star formation]], while elliptical galaxies are composed of predominantly old stellar populations. In fact, current evidence suggests the opposite: the early [[Universe]] appears to be dominated by spiral and irregular galaxies. In the currently favored picture of [[galaxy formation]], present-day ellipticals formed as a result of mergers between these earlier building blocks. Lenticular galaxies may also be evolved spiral galaxies, whose gas has been stripped away leaving no fuel for continued star formation.
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| ==Shortcomings== | |
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| A common criticism of the Hubble scheme is that the criteria for assigning galaxies to classes are subjective, leading to different observers assigning galaxies to different classes (although experienced observers usually agree to within less than a single Hubble type).<ref name=dressler_et_al>{{cite journal |author=Dressler, A. |coauthors=Oemler, A., Jr.; Butcher, H. R.; Gunn, J.E. |date=July 1994 |title=The morphology of distant cluster galaxies. 1: HST observations of CL 0939+4713 |journal=The Astrophysical Journal |volume=430 |issue=1 |pages=107–120 |bibcode=1994ApJ...430..107D | doi = 10.1086/174386}}</ref> The different classification criteria can also be at odds with each other: for example, a more dominant bulge component does not always go hand-in-hand with more loosely-wound spiral arms. Another criticism of the Hubble classification scheme is that, being based on the appearance of a galaxy in a two-dimensional image, the classes are only indirectly related to the true physical properties of galaxies. In particular, problems arise because of [[orientation (geometry)|orientation]] effects (the same galaxy looks very different when viewed edge-on, as opposed to face-on), because visual classifications are less reliable for faint or distant galaxies, and because the appearance of galaxies changes depending on the [[wavelength]] of light in which they are observed. Nevertheless, the Hubble sequence is still commonly used in the field of [[extragalactic astronomy]] and Hubble types are known to [[correlate]] with many physically relevant properties of galaxies, such as luminosities, colours, masses (of stars and gas) and star formation rates.<ref name=roberts_haynes>{{cite journal |last=Roberts |first=M. S. |coauthors=Haynes, M. P. |year=1994 |title=Physical Parameters along the Hubble Sequence |journal=Annual Reviews of Astronomy & Astrophysics |volume=32 |issue=1 |pages=115–152 |bibcode=1994ARA&A..32..115R |doi=10.1146/annurev.aa.32.090194.000555}}</ref>
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| == See also ==
| |
| | |
| * [[Edwin Hubble]]
| |
| * [[Gérard de Vaucouleurs]]
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| * [[Galaxy color-magnitude diagram]]
| |
| * [[Galaxy morphological classification]]
| |
| | |
| == References ==
| |
| {{reflist}}
| |
| | |
| == External links ==
| |
| * [http://www.astr.ua.edu/keel/galaxies/classify.html Galaxies and the Universe] - an introduction to galaxy classification
| |
| * [http://www.ipac.caltech.edu/2mass/gallery/galmorph/ Near-Infrared Galaxy Morphology Atlas], T.H. Jarrett
| |
| * [http://sings.stsci.edu/Publications/sings_poster.html The Spitzer Infrared Nearby Galaxies Survey (SINGS) Hubble Tuning-Fork], [http://sings.stsci.edu/ SINGS] Spitzer Space Telescope Legacy Science Project
| |
| * [http://www.galaxyzoo.org/ Galaxy Zoo] - Galaxy classification participation project.
| |
| | |
| [[Category:Edwin Hubble]]
| |
| [[Category:Classification systems]]
| |
| [[Category:Extragalactic astronomy]]
| |
| [[Category:Galaxy morphological types|*]]
| |
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Each year, health care associated infections affect vast sums of patients worldwide, in both developed and developing countries. They can lead to serious illness, prolonged hospital stays, long term disabilities, added costs to patients as well as their families, additional financial burden around the health care system and, critically, sometimes, tragic demise.
Whatever it is that they were engaged in there, they made stupid mistakes and people were killed because of that and now it is public, or, well, areas of it anyways. So they were the ones who botched it to begin with, just focus and shoot surprised now that people want a few of the truth at least, and are not choosing their pathetic cover up story? If CIA or whatever entity/agency were so darn proficient at their illicit operations, or whatever it was that they were doing there, they should have never been caught unawares, so they might want to Nike Cortez Womens Sale downplay this facility now, however it too late, isn it, after an ambassador and three other Americans were killed. problem is nobody believes their official story now. And that i mean NOBODY.
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