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Topic: Barred spiral galaxy


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In the News (Tue 25 Jun 19)

  
  Sea and Sky's Cosmic Wonders: Galaxies
Galaxies are defined as large groupings of stars, dust, and gas held together by gravity.
Spiral galaxies are represented by the letter S and are divided into four subgroups.
Barred spiral galaxies are represented by the letters SB and are arranges into three subgroups according to the openness of the arms.
www.seasky.org /cosmic/sky7a07.html   (1136 words)

  
 barred spiral
A type of spiral galaxy with a rectangular or cigar-shaped nucleus, from the ends of which spiral arms extend.
Bars are believed to represent a temporary stage in the life of some spiral systems.
Barred galaxies are grouped by their appearance using three criteria: the central bulge and light distribution; the tightness with which the spiral arms are wound; and the degree to which the spiral arms are resolved into stars and nebulae.
www.daviddarling.info /encyclopedia/B/barred_spiral.html   (246 words)

  
 ScienceDaily: Barred spiral galaxy
A barred spiral galaxy is a spiral galaxy with a band of bright stars emerging from the center and running across the middle of the galaxy.
Barred spiral galaxy -- A barred spiral galaxy is a spiral galaxy with a band of bright stars emerging from the center and running across the middle of the...
Galaxy formation and evolution -- The formation of galaxies is still one of the most active research areas in astrophysics; and, to some extent, this is also true for galaxy evolution.
www.sciencedaily.com /encyclopedia/Barred_spiral_galaxy   (1415 words)

  
 Spiral (and other Disk) Galaxies
spiral galaxies often have an ellipsoidally formed "bulge" which may be very luminous (as in case of the Sombrero galaxy M104) or rather inconspicuous; some spirals seem to lack this component at all.
Spiral galaxies, "normal" and barred, with conspicuous bulges (especially near their center) are classified "Sa" or "SBa", those which have prominent bulges and pronounced arms are clssified "Sb" or "SBb", and those which are dominated by the arms are "Sc" or "SBc".
Some of the galaxies, mostly those who had no closer encounters for a longer period of time, and those who have lost most of their interstellar matter for some reason, do not show any conspicuous pattern within their disks; these are often called "S0" or "lenticular" galaxies.
www.seds.org /messier/spir.html   (727 words)

  
 Spiral galaxy - Wikipedia, the free encyclopedia
Spiral galaxies are also named due to the bright arms of star formation within the disk that extend—roughly logarithmically—from the bulge.
Spiral arms are regions of stars that extend from the center of spiral and barred spiral galaxies.
The bulk of the stars in a spiral galaxy are located either close to a single plane (the Galactic plane) in more or less conventional circular orbits around the center of the galaxy (the galactic centre), or in a spheroidal galactic bulge around the galactic core.
en.wikipedia.org /wiki/Spiral_galaxy   (1031 words)

  
 SPACE.com -- Milky Way’s Central Structure Seen with Fresh Clarity
The bar is embedded in the center of the galaxy's spiral arms and cuts across the heart of it all where a supermassive fl hole resides.
Churchwell's team also found that the bar is oriented at about a 45-degree angle relative to the main plane of the galaxy, in which the Sun and the other spiral-arm stars orbit.
Bars are fairly common in large spiral galaxies, but some do not have them.
www.space.com /scienceastronomy/050816_milky_way.html   (592 words)

  
 Spiral Galaxies   (Site not responding. Last check: 2007-10-08)
If you can clearly see the spiral shape, the galaxy is called a "face-on spiral." If you instead see the galaxy from the side, it is called an "edge-on spiral." You can recognize edge-on spiral galaxies because you can see their bright central bulges.
Spiral galaxies are further classified by how tightly their spiral arms are wound.
The arms of a spiral galaxy have lots of gas and dust, and they are often areas where new stars are constantly forming.
skyserver.sdss.org /dr1/en/proj/basic/galaxies/spirals.asp   (388 words)

  
 Galaxy Centaurus A / NGC 5128
Recent observations suggest that the galaxy is actually a giant elliptical that is in the process of devouring a smaller dusty, barred spiral galaxy, similar in size to prominent nearby spiral M33 (Mirabel et al, 1998).
Detection of the spiral's dust in a bi-symmetric structure provides strong evidence of its position deep inside the giant elliptical host while the vast amounts of radio, visual, and x-ray emissions are a result of the energy released by this continuing galactic merger (or "consumption" of a satellite galaxy).
The galaxy is also surrounded by faint shells of gas and dust with a blue arc of young hot stars and star clusters that suggest a collision with a gas-rich, dwarf irregular galaxy (such as POX 186) around 200 to 400 million years ago.
www.solstation.com /x-objects/cent-a.htm   (1484 words)

  
 Hubble Heritage
NGC 1300 is considered to be prototypical of barred spiral galaxies.
Barred spirals differ from normal spiral galaxies in that the arms of the galaxy do not spiral all the way into the center, but are connected to the two ends of a straight bar of stars containing the nucleus at its center.
Due to the galaxy's large size, two adjacent pointings of the telescope were necessary to cover the extent of the spiral arms.
heritage.stsci.edu /2005/01/caption.html   (344 words)

  
 Barred Spiral Galaxies!
Barred Spiral Galaxies are unique in that they have a "bar" that forms out of the nucleus, composed of heavier concentrations of gas, dust, and the stars born thereof.
I had envisioned a galaxy as being something more like the pattern water makes as it "circles the drain", and the swirling arms (which take millions and millions of years to swirl!) were moving concentrations of stars and their associated matter.
The BAR of a Barred Spiral Galaxy, that spins with the nucleus and is composed of much the same material as stars, dust, and gasses, is moving at an incredible velocity.
home.earthlink.net /~humungus/bsg.htm   (1478 words)

  
 Origins: Library
Astronomers have long suspected that the bar systems that dominate the appearance of some spiral galaxies provide an efficient mechanism for fuelling star births at their centres.
The wonderful barred spiral galaxy NGC 2903 in the constellation of Leo is a well-known spring observing target for amateur astronomers.
Barred spirals are excellent laboratories to study the processes that trigger star formation, and bars may be responsible for providing the gaseous fuel being gobbled up by massive central fl holes in so-called active galaxies.
origins.jpl.nasa.gov /library/story/022701-a.html   (655 words)

  
 Galaxies
Spiral galaxies have flattened disks with a spiral pattern in the disk.
The spiral arms can go all of the way into the bulge or be attached to the ends of a long bar of gas and dust that bisects the bulge.
Spiral galaxies are sub-classified into ``a'', ``b'', ``c'', and ``d'' groups according to how loose their spiral arms are and how big the nucleus is. The ``a'' group spirals have large bulges and very tightly wound spiral arms and the ``d'' group spirals have almost no bulge and very loose arms.
www.astronomynotes.com /galaxy/s4.htm   (324 words)

  
 Galaxies (via CobWeb/3.1 planetlab2.tamu.edu)   (Site not responding. Last check: 2007-10-08)
Galaxies are large systems of stars and interstellar matter, typically containing several million to some trillion stars, of masses between several million and several trillion times that of our Sun, of an extension of a few thousands to several 100,000s light years, typically separated by millions of light years distance.
The most massive galaxies are giants which are a million times more massive than the lightest: Their mass range is from at most some million times that of our Sun in case of the smallest dwarfs, to several trillion solar masses in case of giants like M87 or M77.
Our Milky Way Galaxy, a spiral galaxy, is among the massive and big galaxies with at least 250 billion solar masses (there are hints that the total mass may even be as large as 750 billion to 1 trillion times that of the Sun) and a disk diameter of 100,000 light years.
www.seds.org.cob-web.org:8888 /messier/galaxy.html   (1771 words)

  
 Barred spiral galaxy - Wikipedia, the free encyclopedia
Spiral arms appear to emerge from the ends of the "bar" in these galaxies, whereas they appear to emerge directly from the core in ordinary spiral galaxies.
The creation of the bar is generally thought to be the result of a density wave radiating from the center of the galaxy whose effects reshape the orbits of the inner stars.
Bars are thought to be a temporary phenomenon in the life of spiral galaxies, the bar structure decaying over time, transforming the galaxy from a barred spiral to a "regular" spiral pattern.
en.wikipedia.org /wiki/Barred_spiral_galaxy   (730 words)

  
 NGC 1326 Press Release
Galaxies come in a variety of shapes, from elliptical to spiral to irregular, but no shape has intrigued Buta more than the ring patterns seen in some galaxies.
As the pattern rotates, the orbits of stars and gas clouds in the galaxy's disk are perturbed by the bar's gravitational pull, and may become distorted from near-circular shapes.
In some regions of a galaxy's disk, stars and gas clouds will feel the grip of the bar more strongly than in other regions because they are moving in step with the bar pattern.
bama.ua.edu /~rbuta/press-release.html   (1024 words)

  
 2MASS Atlas Image Gallery
Imaging this galaxy in the near-IR allows us to look deeper through the extinction caused by the dust and also better map the light and mass distribution of the galaxy, since the light from spiral galaxies in the near-IR is dominated by lower-mass stars, which comprise most of a galaxy's visible mass.
It is this galaxy for which water megamasers detected in the radio orbiting very near the galaxy's center indicate the presence of a supermassive fl hole and allow an accurate kinematical measurement of the fl hole's mass.
This galaxy has been host to six historical supernovae, four of which are thought to arise from young, massive stellar progenitors, both near the nucleus and in the spiral arms, further evidence for the vigorous galactic star formation.
www.ipac.caltech.edu /2mass/gallery/images_galaxies.html   (5729 words)

  
 The Galaxy Group at UF
Gottesman was Laine's mentor in his study of the dynamics and star formation in the barred spiral galaxy NGC 7479.
As part of that collaboration, the dissertation project of Dr. Boonyasait was concerned with the barred spiral galaxy NGC 3359.
Ratay's research was concerned with the properties of barred galaxies that have flocculent spiral structure.
www.astro.ufl.edu /~gott/group   (419 words)

  
 Galaxies
The arms of NGC 1410, an active, gas-rich spiral galaxy classified as a Seyfert, are awash in blue, the signature color of star-forming regions.
The galaxy pair NGC 3314 is a chance alignment of a face-on spiral galaxy in front of another larger spiral.
In the galaxy at left, the bright blue patch is resolved into a vigorous cascade of clusters and associations of young, hot blue stars, whose formation has been triggered by the tidal forces of the gravitational interaction.
faculty.rmwc.edu /tmichalik/galaxies.htm   (1872 words)

  
 SPACE.com -- 'Barred' Spiral Galaxy Pic Highlights Stellar Birth
Astronomers have long suspected that the bar systems that dominate the appearance of some spiral galaxies provide an efficient mechanism for fueling star births at their centers.
Circumnuclear rings are also seen in other galaxies and are often interpreted as being due to interstellar gas falling in toward their centers.
"Bars seem to be extremely efficient in triggering the formation of stars and they act as funnels for the flow of material from the outer parts of galaxy disks towards their centers."
www.space.com /scienceastronomy/astronomy/hubble_bar_010302.html   (704 words)

  
 Spaceflight Now | Breaking News | Hubble zooms in on beautiful spring spiral galaxy
Astronomers have long suspected that the bar systems that dominate the appearance of some spiral galaxies provide an efficient mechanism for fuelling star births at their centers.
The galaxy bears a close resemblance to our Milky Way, which is also believed to be a barred spiral galaxy.
Barred spirals are excellent laboratories in which to study the processes that trigger star formation, and bars may be responsible for providing the gaseous fuel being gobbled up by massive central fl holes in so-called active galaxies.
www.spaceflightnow.com /news/n0102/28hubble   (837 words)

  
 RedOrbit - Space - Hubble Captures Beautiful Barred Spiral Galaxy   (Site not responding. Last check: 2007-10-08)
The Hubble telescope captured a display of starlight, glowing gas, and silhouetted dark clouds of interstellar dust in this 4-foot-by-8-foot image of the barred spiral galaxy NGC 1300.
Blue and red supergiant stars, star clusters, and star-forming regions are well resolved across the spiral arms, and dust lanes trace out fine structures in the disk and bar.
In the core of the larger spiral structure of NGC 1300, the nucleus shows its own extraordinary and distinct "grand-design" spiral structure that is about 3,300 light-years (1 kiloparsec) long.
www.redorbit.com /news/display?id=117994   (419 words)

  
 index
New Portraits of Spiral Galaxies NGC 613, NGC 1792 and NGC 3627
PR Photo 33a/03 of the barred spiral galaxy NGC 613 was obtained with the FORS1 and FORS2 multi-mode instruments (at VLT MELIPAL and YEPUN, respectively) on December 16-18, 2001.
Each galaxy was observed in three different wavebands for up to 300 seconds per waveband, and the image obtained in each waveband was associated to a colour: B (blue), V (green) and R (red).
www.eso.org /outreach/press-rel/pr-2003/phot-33-03.html   (884 words)

  
 Birth of a barred spiral galaxy - 19 November 1994 - New Scientist
SOME spiral galaxies have an elongated "bar" of stars in their centre.
Bars are composed of dense clusters of dust and stars.
Bars are created in a similar way to spiral arms in galaxies, such as our Milky Way.
www.newscientist.com /article/mg14419522.900.html   (278 words)

  
 NGC 1365 in the Fornax cluster   (Site not responding. Last check: 2007-10-08)
Galaxies occur in a variety of shapes, but among the most eye-catching are the spirals, especially barred spirals.
The obvious 'bar' has the nucleus of the galaxy at its hub and is surrounded by masses of cooler stars that appear yellow on colour photographs.
The bar itself is also yellowish, and has distinct dust lanes but it terminates abruptly in slender, curved arms that are lit by blue stars and the pink star-forming regions from which they spring.
www.aao.gov.au /images/captions/aat055.html   (241 words)

  
 Barred Spiral Galaxies   (Site not responding. Last check: 2007-10-08)
In about a third of spiral galaxies, the arms spiral out, not from the center, but from a straight bar of stars, gas, and dust that extends from both sides of the bright nucleus.
Here are examples of these three sub-groups of barred spiral galaxies.
A new image from the Hubble telescope first posted on "Astronomy Picture of the Day" reveals a barred spiral galaxy with a starburst ring near its center, where new stars are being formed.
www.smv.org /hastings/bsmain.htm   (100 words)

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