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Topic: Dwarf galaxy


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In the News (Tue 21 Nov 17)

  
  Dwarf galaxy has giant surprise
As part of a study of such galaxies, she had earlier made a visible-light image of it at Kitt Peak National Observatory in Arizona.
When she observed the galaxy later using the radio telescope, she found that it is embedded in a huge disk of atomic hydrogen gas.
A few other dwarf galaxies have large gas disks, but unlike these, UGC 5288's disk shows no signs that the gas was either blown out of the galaxy by furious star formation or pulled out by a close encounter with another galaxy.
newsinfo.iu.edu /news/page/normal/1801.html   (560 words)

  
  Galaxy - Wikipedia, the free encyclopedia
Most galaxies are several thousand to several hundred thousand light years in diameter and are usually separated from one another by distances on the order of millions of light years.
Dwarf galaxies may also be classified as elliptical, spiral or irregular.
The galaxy will continue to absorb infalling material from high velocity clouds and dwarf galaxies throughout its life; the cycle of stellar birth and death will increase the abundance of heavy elements, eventually allowing the formation of planets.
en.wikipedia.org /wiki/Galaxy   (2438 words)

  
 Dwarf elliptical galaxy - Wikipedia, the free encyclopedia   (Site not responding. Last check: 2007-10-22)
Dwarf elliptical galaxies are very small elliptical galaxies, classified as dE.
A subtype of dwarf ellipticals is called dwarf spheroidal galaxy.
Therefore, many astronomers have taken to using dwarf spheroidal galaxy to refer to this type.
en.wikipedia.org /wiki/Dwarf_elliptical_galaxy   (206 words)

  
 Canis Major Dwarf Galaxy - Wikipedia, the free encyclopedia
The Canis Major dwarf galaxy is classified as an irregular galaxy and is now thought to be the closest neighbouring galaxy to our location in the Milky Way, being located about 25,000 light-years away from our Solar System and 42,000 light-years from the Galactic Center.
Although closer to the Earth than the centre of the galaxy itself, the Canis Major Dwarf galaxy was difficult to detect as it is located behind the plane of the Milky Way, where concentrations of stars, gas and dust are densest.
It is thought that the open clusters may have formed due to the dwarf galaxy's gravity perturbing material in the galactic disk and stimulating star formation.
en.wikipedia.org /wiki/Canis_Major_(dwarf_galaxy)   (700 words)

  
 Sculptor Dwarf Galaxy: Facts and details from Encyclopedia Topic   (Site not responding. Last check: 2007-10-22)
The sculptor dwarf irregular galaxy (sdig) -also known as eso 349-g31 or pgc 621- is an irregular galaxy in the sculptor...
The sculptor dwarf galaxy (also called e351-g30, pgc 3589, a0058, sculptor dwarf spheroidal galaxy) is a dwarf spheroidal galaxy in the local...
Dwarf spheroidal galaxy (dsph) is a term in astronomy applied to the nine low luminosity dwarf elliptical galaxies that are companions to the milky...
www.absoluteastronomy.com /encyclopedia/s/sc/sculptor_dwarf_galaxy.htm   (480 words)

  
 Hubble Heritage
The interest in low-luminosity, dwarf galaxies derives from the fact that these galaxies are a dominant population of present-day universe and galaxy clusters.
Dwarf galaxies are thought to be the first objects to have formed, that later contributed (through merger events) to the assembling of larger systems.
Dwarf galaxies may hold the key for a deeper understanding of the formation and evolution of bigger, Milky Way-like galaxies.
heritage.stsci.edu /2004/31/supplemental.html   (965 words)

  
 dwarf elliptical galaxy
A dim, low-surface-brightness, gas-poor dwarf galaxy, large numbers of which are found in clusters of galaxies, especially in the vicinity of large galaxies.
Despite their name, dwarf ellipticals are not really fainter versions of true elliptical galaxies, but are structurally distinct.
Dwarf ellipticals are of special interest because it is possible that they are very similar to the fragments from which larger galaxies formed.
www.daviddarling.info /encyclopedia/D/dwarf_elliptical.html   (257 words)

  
 dwarf galaxy
Dwarf irregular galaxies tend to contain a lot of gas and usually show strong signs of ongoing star formation, whereas dwarf elliptical galaxies (of which dwarf spheroidal galaxies are a subcategory) tend to be gas-poor, lower in mass and luminosity, and quiescent.
Dwarf galaxies are the commonest variety in the Local Group and, almost certainly, in the Universe as a whole.
It has been speculated that heavy elements escaping from dwarf galaxies in the early universe may have played a dominant role in enriching the intergalactic gas from which other galaxies form.
www.daviddarling.info /encyclopedia/D/dwarfgal.html   (298 words)

  
 Dwarf Galaxy Gives Giant Surprise
The galaxy van Zee studied, called UGC 5288, had been regarded as just one ordinary example of a very numerous type of galaxy called dwarf irregular galaxies.
When she observed it later using the VLA, she found that the small galaxy is embedded in a huge disk of atomic hydrogen gas.
A few other dwarf galaxies have large gas disks, but unlike these, UGC 5288's disk shows no signs that the gas was either blown out of the galaxy by furious star formation or pulled out by a close encounter with another galaxy.
www.nrao.edu /pr/2005/dwarfgas   (510 words)

  
 Subaru Telescope, NAOJ   (Site not responding. Last check: 2007-10-22)
The discovery challenges current scenarios of galaxy formation by showing that instead of being the preservers of pristine building blocks that combined to form larger galaxies, dwarf irregular galaxies have their own history of build-up.
The most numerous type of galaxies in the universe -- dwarf irregular galaxies (Note 2) -- are supposed to preserve their properties unchanged over billions of years and represent pristine primeval building blocks.
Note 1: The standard cosmological model postulates that galaxy formation is governed by the gravity of the so-called cold dark matter that fills the universe, even though galaxies currently observed consist mainly of normal matter.
www.naoj.org /Pressrelease/2004/08/05   (946 words)

  
 Dwarf galaxy - Wikipedia, the free encyclopedia
A dwarf galaxy is a small galaxy composed of up to several billion stars, a small number compared to our own Milky Way's 200-400 billion stars.
There are many dwarf galaxies in the Local Group: these small galaxies frequently orbit around larger galaxies, such as the Milky Way, the Andromeda Galaxy and the Triangulum Galaxy.
Elliptical galaxy: dwarf elliptical galaxy (dE) and its subtype dwarf spheroidal galaxy (dSph)
en.wikipedia.org /wiki/Dwarf_galaxy   (152 words)

  
 Dwarf galaxy torn apart
Because the dwarf galaxy is so faint, this type of analysis could only be achieved with a large telescope like the Keck, Brodie said.
The two interacting galaxies are among thousands of faint galaxies seen in the background of one of the first images obtained with the new Advanced Camera for Surveys installed on the Hubble Space Telescope last year.
Most dwarf galaxies have highly elongated orbits that take them far away from their host galaxies most of the time.
currents.ucsc.edu /03-04/08-18/galaxy.html   (822 words)

  
 SPACE.com -- Dwarf Galaxies Give Universe a Breath of Fresh Oxygen
The Chandra image of NGC 1569, a dwarf galaxy 7 million light years from Earth, shows large hot bubbles, or lobes extending above and below a disk of gas along the equator of the galaxy.
A team led by Crystal Martin of the University of California, Santa Barbara, observed the dwarf galaxy NGC 1569 using Chandra.
Scientists have speculated that heavy elements escaping from dwarf galaxies in the early universe could play a dominant role in enriching the intergalactic gas from which other galaxies form.
www.space.com /scienceastronomy/astronomy/dwarf_galaxies_020723.html   (672 words)

  
 MDO - Dwarf galaxies provide clues on star formation - 11/18/1996   (Site not responding. Last check: 2007-10-22)
A dwarf galaxy is a galaxy with less than 5 percent of the stars found in an average galaxy, such as the Milky Way, where our solar system is located.
Because galaxies with high red shifts are so distant, the light Earth receives from them was actually emitted billions of years ago.
The pattern of star formation in smaller galaxies tends to be less complex than in larger galaxies, a fact that has given rise to much of the attention dwarf galaxies are now receiving.
www.mndaily.com /daily/1996/11/18/news/dwarf   (449 words)

  
 Dwarf Spheroidal Galaxy in the Virgo Cluster
A team of astronomers has discovered a new dwarf galaxy and up to four possible star clusters in a region of the Virgo cluster of galaxies previously thought to be empty.
Dwarf galaxies are the most numerous type of galaxy in the universe.
Large galaxy clusters such as Virgo are expected to contain thousands of such dwarf galaxies.
cc.ysu.edu /~prdurrel/VICS/PR.html   (1114 words)

  
 Spotlight: The dwarf stream
The international team from France, Italy, the UK, and Australia first observed the previously unknown galaxy, named the Canis Major dwarf galaxy, after analysing a survey of the sky in infrared light of the region of space demarked on star maps by the Big Dog constellation.
Although close in astronomical terms, the dwarf is still thankfully about 25,000 light years away from the Solar system and some 42,000 light years from the centre of the Milky Way.
The presence of the dwarf galaxy was betrayed by its M-giant stars -­ cool, red stars that shine especially brightly in infrared light.
www.psigate.ac.uk /spotlight/issue14/dwarf.html   (495 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)

  
 Press Release   (Site not responding. Last check: 2007-10-22)
Called the Canis Major dwarf galaxy after the constellation in which it lies, it is about 25000 light years away from the solar system and 42000 light years from the centre of the Milky Way.
The discovery of the Canis Major dwarf was made possible by a recent survey of the sky in infrared light (the Two-Micron All Sky Survey or "2MASS"), which has allowed astronomers to look beyond the clouds of dust in the disk of the Milky Way.
The new dwarf galaxy was detected by its M-giant stars -- cool, red stars that shine especially brightly in infrared light.
astro.u-strasbg.fr /images_ri/canm-e.html   (690 words)

  
 The Universe within 50000 Light Years - The Milky Way Galaxy
Large galaxies are surrounded by a halo of tight spherical clusters of stars known as globular clusters.
It is orbiting our galaxy in a period of about 1 billion years but it cannot be expected to last much longer, in a few hundred million years it will be ripped apart by our own galaxy.
The Sloan Digital Sky Survey for instance report that outside of the Galaxy there are huge clumps of stars that appear to be the remains of smaller galaxies that were ripped apart by the Milky Way more than a billion years ago.
www.anzwers.org /free/universe/galaxy.html   (543 words)

  
 NOAO Release 99-01
Small galaxies of the type found by Jacoby and collaborators are the most common type of galaxy in the universe, yet the region around the Milky Way Galaxy's big brother, the spiral galaxy in Andromeda, had been thought to be highly deficient of these "dwarf" galaxies before the team began their search.
The dark regions in the center of the righthand panels are the signatures of the dwarf galaxy candidate.
Dwarf galaxies like And VI are thought by many to be the building blocks of bigger galaxies through a mechanism referred to as "cannibalism".
www.noao.edu /outreach/press/9901.html   (917 words)

  
 [116.10] A Census of the Dwarf Galaxies in Stephan's Quintet Including New Tidal Dwarf Galaxy Candidates   (Site not responding. Last check: 2007-10-22)
Many (21) of these candidate dwarf galaxies are blue star forming regions in the tidal debris surrounding NGC 7318A/B that are known to be bright H-\alpha sources from ground-based imaging.
Among the remaining candidate dwarf galaxies, there are also 12 objects found within the bright isophotes of the NGC 7319 tidal tail that we consider tidal dwarf candidates.
Since optical surveys of interacting galaxies are likely to misclassify tidal dwarf galaxies that are similar to those in the H\textsc{I} tail of the Quintet, we suggest that the importance of the tidal dwarf phenomenon may be underestimated.
www.aas.org /publications/baas/v34n4/aas201/690.htm   (390 words)

  
 dwarf irregular galaxy
A dwarf galaxy that lacks any apparent structure or uniformity of shape.
Dwarf irregulars (dI) are becoming increasingly important in understanding the evolution of galaxies in general, because, with many examples nearby, they enable detailed study of important issues such as the occurrence of galactic winds, the chemical enrichment of the interstellar and intergalactic media, and the photometric evolution of galaxies.
In addition, their low level of evolution, as implied by their low metallicity and high gas content, makes these systems the most similar to primeval galaxies and, therefore, the most useful to infer the primordial galaxy conditions.
www.daviddarling.info /encyclopedia/D/dwarf_irregular.html   (201 words)

  
 Headlines@Hopkins: Johns Hopkins University News Releases
They were found to be in a dwarf galaxy located along the line of sight to the center of our galaxy, but on the far side of the Milky Way.
Known as the Sagittarius dwarf spheroidal galaxy -- since it is observed in the direction of the constellation Sagittarius -- it is roughly one-tenth the diameter of the Milky Way but weighs less than one-thousandth as much as the Milky Way.
The galaxy is one of nine known nearby, or companion, dwarf spheroidal galaxies to the Milky Way.
www.jhu.edu /news_info/news/home98/feb98/invader.html   (927 words)

  
 CNN.com - Dwarf galaxy breathes oxygen into cosmos - July 23, 2002
Known as NGC 1569, the small galaxy has two giant bubbles extending in opposite directions that transport into the intergalactic medium an estimated 3 million times the oxygen found in the sun.
Previous dwarf galaxies could have spit out similar nutrient-rich clouds, influencing the evolution of galaxies in the early universe, the research team said.
Besides playing a major part in the formation of galaxies, they are instrumental in the formation of planets.
www.cnn.com /2002/TECH/space/07/23/dwarf.galaxy/index.html   (392 words)

  
 Sagittarius Dwarf Elliptical Galaxy / SagDEG
This hypothesis appears to be supported by direct and indirect observations of the destruction of dwarf galaxies in distant (and therefore ancient) reaches of the universe.
Aside from older and more metal-poor, RR Lyrae variable stars, the bulk of the galaxy's stars were recently found to be relatively metal-rich and determined to be around 10 to 14 billion years old (Fahlman et al, 1996).
Although SagDEG and the LMC could have been part of a larger galaxy which broke up into several pieces after colliding with the Milky Way, it's unclear how such a collision could leave the two galaxies in their present configuration, where the orbital plane of one is perpendicular to that of the other.
www.solstation.com /x-objects/sag-deg.htm   (2260 words)

  
 Canis Major Dwarf Galaxy
The Canis Major dwarf galaxy is classified as an irregular galaxy and is now thought to be the closest neighbouring galaxy to the Milky Way, being located only 42,000 light-years from the Galactic Center and approximately 25,000 light-years away from our Solar System.
It has a roughly elliptical shape and is thought to contain as many stars as the Sagittarius Dwarf Elliptical Galaxy, the previous contender for closest galaxy to the Milky Way.
The galaxy was first discovered in November 2003 by an international team of French, Italian, British and New Zealand astronomers.
en.mcfly.org /Canis_Major_Dwarf_Galaxy   (651 words)

  
 Canis major dwarf galaxy - Wikipedia, the free encyclopedia   (Site not responding. Last check: 2007-10-22)
Start the Canis major dwarf galaxy article or add a request for it.
Look for Canis major dwarf galaxy in Wiktionary, our sister dictionary project.
Look for Canis major dwarf galaxy in the Commons, our repository for free images, music, sound, and video.
www.sciencedaily.com /encyclopedia/canis_major__dwarf_galaxy_   (161 words)

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