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Topic: Irregular galaxy

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In the News (Thu 18 Apr 19)

  Leicester University Physics Department   (Site not responding. Last check: 2007-09-06)
In general, galaxies are widely scattered, and there exists so much space between one and the next, that only one collision would occur in around 100 times the age of the universe, so that we would not expect to see any of these objects.
This is another result of the collision of galaxies; in this case, a small galaxy (which may be one of the objects on the right of the ring) passed through the middle of the main galaxy (which is thought to have been a spiral), causing gas and dust to be compressed.
The smaller galaxy (appearing as a bright patch directly above the main object) is NGC 5195; this galaxy seems to be developing into a spiral structure, although the shape is very difficult to detect, and at present it is more properly classified as an irregular on the basis of its appearance.
www.star.le.ac.uk /edu/Irregular.shtml   (1469 words)

 Irregular galaxy - Wikipedia, the free encyclopedia
This type of galaxy is now thought to be important to understand the overall evolution of galaxies, as they tend to have a low level of metallicity and relatively high levels of gas, and are thought to be similar to the earliest galaxies that populated the Universe.
Some irregular galaxy are small spiral galaxies that are being distorted by the gravity of a larger neighbour.
The Magellanic Cloud galaxies were once classified as irregular galaxies, but have since been found to contain barred spiral structures, and have been since re-classified as "SBm", a fourth type of barred spiral galaxy.
en.wikipedia.org /wiki/Irregular_galaxy   (331 words)

 irregular galaxy
A galaxy, with a poorly-defined structure, that falls outside the categories of disk galaxy or elliptical galaxy.
Small irregular galaxies that appear to be completely non-uniform in shape are known as dwarf irregular galaxies.
A nearby example of an irregular galaxy is the Sagittarius Dwarf Irregular (SagDIG).
www.daviddarling.info /encyclopedia/I/irregular_galaxy.html   (194 words)

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

 Irregular Galaxies   (Site not responding. Last check: 2007-09-06)
This irregular galaxy is a member of the Local Group, at a distance of about 10 million light years (Ref).
Other examples of irregular galaxies are the Large Magellanic Cloud (a satellite galaxy of the Milky Way) and the Messier object M82.
Hubble's original classification just lumped all galaxies that are not spirals or elliptical into the irregular category, but it is more common today to make further distinction between more "normal" irregular galaxies and peculiar galaxies, which are galaxies that look unusual in some respect (M82, for instance).
csep10.phys.utk.edu /astr162/lect/galaxies/irregular.html   (246 words)

 Hubble Heritage
While imaging the Sagittarius dwarf irregular galaxy (SagDIG), astronomers were surprised to see the trail of a faint asteroid that had drifted across the field of view during the exposures.
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.
Indeed, dwarf irregular galaxies owe their "irregularity" to the way these star-forming complexes are distributed: all over the face of the galaxy and rarely showing ordered patterns as in giant spiral galaxies like our Milky Way.
heritage.stsci.edu /2004/31/supplemental.html   (965 words)

 Irregular Galaxies   (Site not responding. Last check: 2007-09-06)
Irregular galaxies are those which do not match the standard Hubble scheme of elliptical, spiral and lenticular galaxies.
There's only one irregular galaxy in Messier's catalog: M82, and this one is a distorted disk galaxy.
The only further irregular galaxies known to 1782 are the Large and the Small Magellanic Cloud; these are probably miniature disk galaxies in mutual gravitational interaction, and in interaction with our Milky Way.
www.seds.org /messier/irre.html   (168 words)

The dwarf irregulars may be the most common type of galaxy in the universe (or maybe the dwarf ellipticals are).
The estimates of the number of dwarf irregulars and dwarf ellipticals are based on the proportions of these types of galaxies in nearby groups.
The dwarf galaxies far away are too faint to be seen and are, therefore, overlooked in surveys of the sky.
www.astronomynotes.com /galaxy/s5.htm   (493 words)

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.
Occasionally, at irregular intervals given by chance, in any type of galaxies, a supernova occurs: This is a star suddenly brightning to a high luminosity which may well outshine the whole galaxy; the maximal absolute magnitude of a supernova may well reach -19 to -20 magnitudes.
www.seds.org /messier/galaxy.html   (1771 words)

 Local Group: Encyclopedia topic   (Site not responding. Last check: 2007-09-06)
Andromeda Galaxy (Andromeda Galaxy: A spiral galaxy in the constellation of Andromeda that is visible to the naked eye) (M31 (M31: the andromeda galaxy (also known as messier object 31, m31, or ngc 224) is a giant spiral...
Irregular galaxies (Irregular galaxies: an irregular galaxy is a galaxy that does not fall into the hubble classification for...
Leo A (Leo A: leo a or leo iii is an irregular galaxy in the constellation leo....
www.absoluteastronomy.com /reference/local_group   (2323 words)

 Subaru Telescope, NAOJ
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.
Note 2: Dwarf irregular galaxies are small galaxies with an irregular distribution of stars and gas.
www.naoj.org /Pressrelease/2004/08/05   (946 words)

 StarChild: Galaxies
A galaxy is a cluster of stars, dust, and gas which is held together by gravity.
A galaxy may be alone or it may be in a large group of galaxies called a "supercluster".
An irregular galaxy has an undefined shape and is full of young stars, dust, and gas.
starchild.gsfc.nasa.gov /docs/StarChild/universe_level2/galaxies.html   (335 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)

 irregular galaxy concept from the Astronomy knowledge base   (Site not responding. Last check: 2007-09-06)
both are members of the local group of galaxies, and in fact seem to be associated, though detached, parts of the milky way system., The Large and Small Magellanic Clouds, the two nearest and largest of the galaxies that orbit the milky way.
The Magellanic Clouds lie in the southern sky and cannot be seen from the United States., Two galaxies that lie close to the milky way galaxy.
They are visible in the southern skies of Earth., Two small irregular (or possibly barred spiral) galaxies (satellites of the Milky Way galaxy) about 50-60 kpc (LMC, in Dorado) and 60-70 kpc (SMC, in Toucana) distant, visible to the naked eye from the southern hemisphere.
www.site.uottawa.ca:4321 /astronomy/irregulargalaxy.html   (284 words)

 Irregular Galaxies - Zoom Astronomy
One way irregular galaxies are formed is when galaxies collide or come close to one another, and their gravitational forces interact.
Another source of irregular galaxies may be very young galaxies that have not yet reached a symmetrical state.
A peculiar galaxy is an irregular galaxy that has an abnormal shape (neither elliptical, spiral, nor lenticular) and/or has another unusual characteristic, like jets of gas spewing from the nucleus, unusual amounts of dust, low surface brightness, etc. They are probably formed as galaxies collide or have companion galaxies that influence them.
www.enchantedlearning.com /subjects/astronomy/stars/galaxy/irregular.shtml   (406 words)

 Irregular Galaxy IC 10 - Wikipedia, the free encyclopedia
Irregular Galaxy IC 10 (or simply IC 10) is an irregular galaxy, a dwarf galaxy, and a starburst galaxy in the Cassiopeia constellation.
IC 10 is located approximately 4.2 million light years away from the Milky Way.
It is also the closest known starburst galaxy and a member of the Local Group.
en.wikipedia.org /wiki/Irregular_Galaxy_IC_10   (114 words)

 Dwarf galaxy has giant surprise
The galaxy van Zee studied, called UGC 5288, had been regarded as just one ordinary example of a numerous type called dwarf irregular galaxies.
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)

 NGC 3077, Irregular Galaxy   (Site not responding. Last check: 2007-09-06)
While this galaxy at first appears to be a typical elliptical galaxy, a closer examination of the image reveals several dark lanes extending from the non-uniform nucleus.
The galaxy is one of the members of the M-81 group, and it is more akin to disturbed galaxy M-82 than it is to an elliptical.
This is probably another group member disrupted by the gravitational force of giant spiral galaxy M-81, and as a result, it is a site of intense star formation.
www.kopernik.org /images/archive/n3077.htm   (174 words)

 SPACE.com -- Hubble Sees Galactic Evolution in Odd Stellar Collection
The galaxy is known as a dwarf irregular because it lacks structure common to larger galaxies.
Astronomers suspect dwarf galaxies were the first type to form in the universe, so understanding how dwarf irregular galaxies evolve should provide clues about galaxy formation and evolution in general.
Galaxies like NGC 1705 are thought to represent the building blocks from which more massive spiral and elliptical galaxies formed, often through mergers.
www.space.com /scienceastronomy/hubble_stars_030207.html   (575 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   (211 words)

 Star Formation and Gas Densities in the Dwarf Irregular Galaxy Sextans A   (Site not responding. Last check: 2007-09-06)
Irregular galaxies provide star-forming systems that are unperturbed by spiral density waves.
The current star formation is in clumps in the outer parts of the galaxy and is not evenly distributed.
The current star formation is located in the region of the galaxy with higher radially averaged observed gas densities relative to the critical density.
www.aas.org /publications/baas/v27n4/aas187/S011005.html   (342 words)

 [No title]   (Site not responding. Last check: 2007-09-06)
Regular galaxy clusters are spherically shaped, and usually rich, which means they have thousands of galaxy members.
Irregular clusters have no specific shape and are generally poor, having only about a hundred members or less.
These superclusters, or a cluster of clusters of galaxies, span huge regions of the universe and have large voids of space in between them.
astrosun.tn.cornell.edu /academics/courses/astro201/galaxies/clus.htm   (237 words)

 Stellar Populations of the Sagittarius Dwarf Irregular Galaxy (ResearchIndex)   (Site not responding. Last check: 2007-09-06)
Stellar Populations of the Sagittarius Dwarf Irregular Galaxy (ResearchIndex)
Stellar Populations of the Sagittarius Dwarf Irregular Galaxy
From this the distance to this galaxy is estimated to be d = 1:18 \Sigma 0:10 Mpc....
citeseer.ist.psu.edu /475272.html   (251 words)

 Spaceflight Now | Breaking News | Dwarf irregular galaxies are not so pristine after all
In the scenarios of standard cosmology, galaxies are built up via hierarchical merging: small primordial density fluctuations in the smooth distribution of matter in the early Universe grow and combine to form larger structures like the Milky Way.
The most numerous type of galaxies in the universe -- dwarf irregular galaxies -- are supposed to preserve their properties unchanged over billions of years and represent pristine primeval building blocks.
However, this study clearly reveals that the dwarf irregular galaxy Leo A already has disk and halo components, and suggests complex build-up histories for even very low mass galaxies like Leo A, which are supposed to form directly from the primordial density fluctuations in the early universe, and challenges contemporary understanding of galaxy evolution.
www.spaceflightnow.com /news/n0408/08smallgalaxy   (919 words)

 Galaxy Types   (Site not responding. Last check: 2007-09-06)
Or perhaps some of the elliptical galaxies are made from merging of other types of galaxies.
Observations of distant galaxies indicates that spiral galaxies were more common in the past than they are today.
One problem is that if most of the mass in galaxies is unaccounted for, we have a hard time understanding the dynamics of galaxy formation.
zebu.uoregon.edu /~soper/Galaxies/types.html   (291 words)

 Sagittarius Dwarf Irregular Galaxy - Wikipedia, the free encyclopedia
This template may be found on the article's talk page, where there may be further information.
The Sagittarius Dwarf Irregular Galaxy or SagDIG is a dwarf galaxy in the constellation of Sagittarius.
SagDIG should not be confused with the Sagittarius Dwarf Elliptical Galaxy or SagDEG, a satellite galaxy of the Milky Way.
en.wikipedia.org /wiki/Sagittarius_Dwarf_Irregular_Galaxy   (149 words)

 Kayser, Susan Elizabeth (1965-12-13) Photometry of the nearby irregular galaxy, NGC 6822. ...
Kayser, Susan Elizabeth (1965-12-13) Photometry of the nearby irregular galaxy, NGC 6822.
Photometry of the nearby irregular galaxy, NGC 6822
Thirty-two variable stars are discussed, of which thirteen are Cepheids, two are red semi-regulars, one may be eclipsing, and the others are irregular.
etd.caltech.edu /etd/available/etd-09232002-112325   (254 words)

 Irregular Galaxies
Any galaxy which does not look like an elliptical or spiral is called an irregular galaxy.
Irr I galaxies are similar to spirals because they have lots of gas and young stars, but they don't have spiral arms.
Their appearance leads some astronomers to think that Irr II galaxies may have collided with another galaxy at some time during their lives.
www.windows.ucar.edu /tour/link=/the_universe/Irregulars.html&edu=elem   (198 words)

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