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Topic: Sagittarius (dwarf galaxy)

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www.brainyencyclopedia.com /topics/dwarf.html   (622 words)

 Sagittarius Dwarf Elliptical Galaxy - Wikipedia, the free encyclopedia
Although it is one of the closest companion galaxies to the Milky Way, it is on the opposite side of the galactic core from Earth, and consequently is very faint, although it covers a large area of the sky.
Sag DEG appears to be an older galaxy, with little interstellar dust and composed largely of Population II stars, older and metal-poor compared to the Milky Way.
From its discovery until 2003, it was considered to be the closest outside galaxy to Earth, but since then has been overtaken by the newly discovered Canis Major Dwarf Galaxy.
en.wikipedia.org /wiki/Sagittarius_Dwarf_Elliptical_Galaxy   (547 words)

 Kids.net.au - Encyclopedia Galaxy formation and evolution -
Though the formation, and to some extent the evolution of galaxies still is one of the most active research areas in astrophysics, some ideas are now widely accepted.
Also, spiral galaxies cannot be built up by mergers, since events as violent as a merger would completely mix up the fragile structure of the disk.
In the current universe, it is thought that large spiral galaxies such as M31 and our Milky Way are formed from numerous smaller galaxies being eaten by the larger galaxy.
www.kids.net.au /encyclopedia-wiki/ga/Galaxy_formation_and_evolution   (741 words)

 WIMPS In Passing   (Site not responding. Last check: 2007-10-15)
The invading galaxy, which is a fraction the size of our own, was discovered by a team of UK astrologers in 1994 while they were analyzing stars in a concentrated, elliptical bulge at the center of the Milky Way.
Instead, they were found to be part of a dwarf galaxy located along the line of sight to the center of our galaxy, but on the opposite side.
Sagittarius was thus hidden from clear view even though it was on a collision course.
perdurabo10.tripod.com /id709.html   (509 words)

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www.brainyencyclopedia.com /topics/galaxy.html   (1006 words)

 Learn more about Galaxy formation and evolution in the online encyclopedia.   (Site not responding. Last check: 2007-10-15)
The formation of galaxies is still is one of the most active research areas in astrophysics; and, to some extent, this is also true for their evolution.
High Velocity Clouds, clouds of neutral hydrogen are "raining" down on the Galaxy, and presumably have been from the beginning (these would be the necessary source of a gas disk from which the disk stars formed).
If either galaxy were a spiral before the merger, the violence of event would disrupt the delicate structure of the disk.
www.onlineencyclopedia.org /g/ga/galaxy_formation_and_evolution.html   (1434 words)

 Energy Citations Database (ECD) - Energy and Energy-Related Bibliographic Citations
The extinction to Wray 16-423 (E{sub B{minus}V}=0.14) is consistent with the line-of-sight extinction to the Sagittarius Dwarf.
The Sagittarius PN progenitor stars are representative of the higher metallicity tail of the Sagittarius population.
The oxygen abundance of the Sagittarius galaxy deduced from its PN shows similarities with that of dwarf ellipticals around M31, advancing the notion that this galaxy was a dwarf elliptical before its interaction with the Milky Way.
www.osti.gov /energycitations/product.biblio.jsp?osti_id=564877   (408 words)

 The Sagittarius Dwarf Elliptical Galaxy, SagDEG
This galaxy was immediately recognized as being the nearest known neighbor to our Milky Way, significantly closer than the Large Magellanic Cloud which was considered to be our closest companion until than.
This dwarf galaxy is called SagDEG (for Sagittarius Dwarf Elliptical Galaxy), or sometimes Sagittarius Dwarf Spheroidal Galaxy; don't confuse it with another member, SagDIG (Sagittarius Dwarf Irregular Galaxy).
These are two minor galaxies in the same constellation Sagittarius, which are of different type: The difference between these types is that dwarf irregulars still have interstellar matter and/or young stars while the dwarf elliptical have only an old yellowish stellar population.
www.seds.org /messier/more/sagdeg.html   (560 words)

 The Johns Hopkins Gazette: March 2, 1998
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 several nearby dwarf galaxies that are considered to be companions to the Milky Way, said Wyse, a professor in the Department of Physics and Astronomy.
www.jhu.edu /~gazette/janmar98/mar0298/02galaxy.html   (1146 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.
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.
Up-to-date technical summaries on the Sagittarius dwarf galaxy may be available at: NASA's ADS Abstract Service for the Astrophysics Data System; the SIMBAD Astronomical Database mirrored from CDS, which may require an account to access; and the NSF-funded, arXiv.org Physics e-Print archive's search interface.
www.solstation.com /x-objects/sag-deg.htm   (2260 words)

 S186-007T   (Site not responding. Last check: 2007-10-15)
The Sagittarius dwarf galaxy, located at a distance of $\sim 15$ kpc behind the Galactic bulge, is in the process of being tidally disrupted and assimilated into the Milky Way.
Numerical simulations are presented, constrained by the lastest kinematic and structural data, which show that the luminous component of this dwarf galaxy must reside within a substantial dark matter halo for the dwarf to have survived the Galactic tides long enough to be seen at the present time.
However, the timescale for the complete disruption of the Sagittarius dwarf is model-dependent and remains presently unknown.
www.ifa.hawaii.edu /iau-s186/abstracts/html/007T.html   (209 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 Sagittarius Dwarf galaxy is also very dimly visible in this picture extending downwards from the left side of the bulge.
www.ldps.ws /Mirror/Universe/galaxy.html   (530 words)

 [No title]
Thousands of stars stripped from the nearby Sagittarius dwarf galaxy are streaming through our vicinity of the Milky Way galaxy, according to a new view of the local universe constructed by a team of astronomers from the University of Virginia and the University of Massachusetts.
Even the existence of Sagittarius was unknown until the heart of this nearest satellite galaxy of the Milky Way was discovered by a British team of astronomers in 1994.
Sagittarius debris can be seen extending from the dense 'core' of the Sagittarius dwarf, wrapping around the galaxy, and descending through the Sun's position.
www.astro.virginia.edu /~mfs4n/sgr   (1310 words)

 APOD: March 29, 1997 - The Closest Galaxy: The Sagittarius Dwarf   (Site not responding. Last check: 2007-10-15)
Deemed the "Sagittarius Dwarf", this small galaxy went unnoticed until its discovery in 1994 by R.
The reason the Sagittarius Dwarf hadn't been discovered earlier is because it is so dim, it is so spread out over the sky, and there are so many Milky Way stars in front of it.
The distance to the Sagittarius Dwarf was recently measured to be about one third of the distance to the LMC.
antwrp.gsfc.nasa.gov /apod/ap970329.html   (175 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   (185 words)

 Press Release
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)

 Astronomy Picture of the Day 9-30-03
This unfortunate neighbor, the Sagittarius Dwarf galaxy, is now seen to be part of a larger Sagittarius Tidal Stream, a loose filament of stars, gas, and possibly dark matter that entangles the Milky Way.
An important resulting realization is that galaxies contain a jumble of clumps and filaments of both dim and dark matter.
The Sagittarius dwarf galaxy is currently being shredded by the Milky Way's gravity, and tossing its stars across the Galaxy.
www.freerepublic.com /focus/f-chat/991976/posts   (978 words)

 Sagittarius (dwarf galaxy) - Wikipedia, the free encyclopedia
Wikimedia needs your help in the final days of its fund drive.
There is more than one dwarf galaxy in the constellation of Sagittarius
This is a disambiguation page — a list of pages that otherwise might share the same title.
en.wikipedia.org /wiki/Sagittarius_(dwarf_galaxy)   (110 words)

 dwarf elliptical galaxy   (Site not responding. Last check: 2007-10-15)
Dwarf elliptical are very small elliptical galaxies, classified as dE.
They are are quite common, and usually are companions to other galaxies.
There are Two Dwarf ellipticals in orbit around the Andromeda galaxy
www.yourencyclopedia.net /Dwarf_elliptical_galaxy   (170 words)

 Stellar Populations of the Sagittarius Dwarf Irregular Galaxy (ResearchIndex)   (Site not responding. Last check: 2007-10-15)
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   (226 words)

 EXN.ca | Discovery
Recent observations have identified long streamers of stars trailing away from the Sagittarius dwarf, leaving little doubt that the Milky Way's strong gravitational influence is ripping apart this tiny neighbor.
The constellation Sagittarius is easily identified as a group of stars in the shape of a Teapot.
If the Sagittarius dwarf were at least fifty times more massive than it appears, it could have resisted the destructive effects of the Milky Way and survived to the present.
www.exn.ca /Stories/1998/09/25/55.asp   (1016 words)

 Dwarf Tales: Alphabetical Abstracts List
Almoznino, E., Brosch, N. Late-Type Dwarf Galaxies in the Virgo Cluster: I. The Samples 1998, MNRAS 298, 920 noah@stsci.edu DT2 (May 98) Almoznino, E., Brosch, N. Late-Type Dwarf Galaxies in the Virgo Cluster: II.
B and R Photometry of Dwarf Galaxies in the M81 Group 1998, A&AS 129, 313 bremnes@astro.unibas.ch DT3 (Jul 98) Bremnes, T., Binggeli, B., Prugniel, P. Structure and Stellar Content of Dwarf Galaxies.
Series, in press (1999) gdc@mso.anu.edu.au http://xxx.lanl.gov/abs/astro-ph/9901258 DT6 (Feb 99) Davies, J., Morshidi-Esslinger, Z., Smith, S. The Distribution of LSB Dwarf Galaxies in the Local Universe To be published in: Proceedings of the XVIIIth Moriond Astrophysics Meeting ``Dwarf Galaxies and Cosmology'', Les Arcs, March 1998, eds.
www.astro.uni-bonn.de /~dwarfs/DTlist.html   (2468 words)

 AAS Report 1999
In most galaxies small-scale variations in the magnitude and even the direction of the vertical gradient are observed: at larger galactocentric distances they generally display redder colors with increasing z height, whereas the opposite is often observed in and near the galactic centers.
For a significant fraction of the sample galaxies another mechanism in addition to the effects of stellar population gradients is required to explain the magnitude of the observed gradients.
A first result is the discovery of an interacting pair of galaxies which appear to have spawned about 10 dwarf galaxies in the tidal tails, raising a possible creation mechanism for the large number of dwarf galaxies found both in clusters and the field.
www.astro.virginia.edu /research/aas99   (8461 words)

 SPACE.com -- Nearest Galaxy Ripped from Another, Study Suggests
The Sagittarius dwarf galaxy, our closest neighbor at just 75,000 light-years away, was only found in 1994.
Since the discovery of the Sagittarius dwarf galaxy, researchers have noticed that some of its younger stars are strikingly similar to stars in the Large Magellanic Cloud, another satellite galaxy that sits just a bit further out in space.
Cseresnjes thinks the evidence may point to a common ancestor, a larger galaxy that was ripped apart to form both the Large Magellanic Cloud and the nearer Sagittarius dwarf galaxy, or Sgr as astronomers call it.
www.space.com /scienceastronomy/astronomy/sgr_galaxy_020227.html   (666 words)

 SPACE.com -- Closest Known Galaxy Just Discovered
A small galaxy has just been detected as it is being ripped apart and swallowed by the much larger Milky Way.
The Canis Major dwarf galaxy, as it is now called, is closer to the center of our galaxy than any previously known.
Canis Major dwarf is, on average, about 25,000 light-years from our solar system and some 42,000 light-years from the center of the Milky Way.
www.space.com /scienceastronomy/closest_galaxy_031104.html   (491 words)

 Sagittarius dwarf galaxy
Is the Sagittarius dwarf galaxy a debris of the Large Magellanic Cloud?
Figure 3 compares the period distribution of RR Lyrae stars in Sgr with those of all other dwarf galaxies with a known RR Lyrae population.
Numerical simulations show that a dwarf spheroidal galaxy can not survive more than a couple of Gigayears on such a low orbit, unless the progenitor is given an uncomfortable high concentration, inconsistent with observations.
www.obspm.fr /actual/nouvelle/feb02/cseresnjes.en.shtml   (1088 words)

 HubbleSite - Hubble Images Sagittarius Dwarf Galaxy - Image - 11/11/2004   (Site not responding. Last check: 2007-10-15)
As their name implies, dwarf irregular galaxies are unlike their spiral and elliptical cousins, because of their much smaller physical size and lack of definite structure.
Using Hubble, astronomers are able to resolve dwarf irregular galaxies that are at very large distances from Earth, into individual stars.
By examining properties of the galaxy, such as distance, age and chemical composition, the star formation history of the whole galaxy is better understood, and reveals how, where, and when active star formation took place.
hubblesite.org /newscenter/newsdesk/archive/releases/2004/31/image/b   (476 words)

 Sagittarius Dwarf Elliptical Galaxy (SagDEG, Sag dSph)
A satellite galaxy of the Milky Way and the closest external galaxy; it is populated, as usual for a dwarf elliptical galaxy, by old yellowish stars.
It has four known globular clusters— M54, Arp 2, Terzan 7, and Terzan 8—of which M54 is easily the brightest and was the first extragalactic globular ever found, by Charles Messier in 1778.
SagDEG should not be confused with another member of the Local Group, also in the constellation Sagittarius—the Sagittarius Dwarf Irregular Galaxy (SagDIG).
www.daviddarling.info /encyclopedia/S/SagDEG.html   (269 words)

 eSky: Sagittarius Dwarf Galaxy   (Site not responding. Last check: 2007-10-15)
One of a number of small galaxies known to be associated with the Milky Way spiral.
The Sagittarius Dwarf Galaxy is roughly spheroid in shape, approximately 10,000 light years in diameter.
This event is taking place at the base of the Outer Arm, on the other side of the Galaxy from our Sun.
www.glyphweb.com /esky/galaxies/sagittariusdwarfgalaxy.html   (70 words)

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