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Topic: Galactic Center

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In the News (Fri 24 Nov 17)

  Galactic Center - Wikipedia, the free encyclopedia
Work presented in 2002 by Antony Stark and Chris Martin mapping the gas density in a 400 light year region around the galactic center has revealed an accumulating ring with a mass several million times that of the Sun and near the critical density for star formation.
They predict that in approximately 200 million years there will be an episode of starburst in the galactic center, with many stars forming rapidly and undergoing supernovas at a hundred times the current rate.
The coordinates of Galactic Center in the Equatorial coordinate system are: RA 17h45m40.04s, Dec -29º 00' 28.1" (J2000 epoch).
en.wikipedia.org /wiki/Galactic_Center   (336 words)

 Galactic Center -- Facts, Info, and Encyclopedia article   (Site not responding. Last check: 2007-10-20)
It is located at a distance of about 8 kiloparsecs in the brightest part of the Milky Way, in the direction of the (A configuration of stars as seen from the earth) constellation (Type family of the Sagittariidae) Sagittarius.
The available information about the Galactic Center comes from observations at (Electromagnetic radiation emitted during radioactive decay and having an extremely short wavelength) gamma ray, hard X-ray, (The infrared part of the electromagnetic spectrum; electromagnetic wave frequencies below the visible range) infrared, sub-millimetre and (A communication system based on broadcasting electromagnetic waves) radio wavelengths.
They predict that in approximately 200 million years there will be an episode of (Click link for more info and facts about starburst) starburst in the galactic center, with many stars forming rapidly and undergoing supernovas at a hundred times the current rate.
www.absoluteastronomy.com /encyclopedia/g/ga/galactic_center.htm   (258 words)

 Distance to the Galactic Center   (Site not responding. Last check: 2007-10-20)
Galactic rotation studies and strong radio emissions from the same part of the sky also support the presence of the Galactic center in Sagittarius (Bok 1981).
By calculating the center of the distribution of the globular clusters surrounding the Milky Way, he determined the Galactic center was in Sagittarius, and the Solar System was 13 kiloparsecs from the Galactic center (Reid 1993; Gino 2003).
The observed brightness of these stars near the Galactic center can be corrected for interstellar extinction and then compared to their known intrinsic luminosities, thus permitting the distance to the Galactic center to be estimated.
www.grasslands.org /Essays2.htm   (1749 words)

 Science News: X-ray 'ridge' in galactic center
This time, an-ray survey of the center of the galaxy using the satellite Exosat has found a mysterious "ridge" of X-ray emissions stretching for 40[deg.' on each side of the galactic center, two ninths of the way around the sky.
(Galactic longitude is counted from the center of the galaxy, which is longitude 0[deg.].) One of the people involved with the HEAO-1 work, Diana Worrall of the Harvard-Smithsonian Center for Astrophysics in Cambridge, Mass., says therefore that she is not surprised that the Leicester group has found what they did.
She suggests that the ridgelike features at large galactic longitudes may be extensions of this central piece.
www.findarticles.com /p/articles/mi_m1200/is_v128/ai_3969461   (453 words)

 NRAO Glossary
Accretion Disk: A disk of gas that accumulates around a center of gravitational attraction, such as a white dwarf, a neutron star, or a fl hole.
Active Galactic Nuclei (AGN): A galaxy with an unusually bright central region thought to contain a supermassive fl hole actively pulling in tremendous amounts of matter from a swirling disk of gas, stars, and dust.
Galactic Center: The central region of a galaxy characterized by high densities of stars.
wwwmain.cv.nrao.edu /imagegallery/glossary.shtml   (4257 words)

 Encyclopedia: Galactic center   (Site not responding. Last check: 2007-10-20)
Artists conception of a binary star system with one fl hole and one main sequence star An accretion disc (or accretion disk) is a structure formed by material falling into a gravitational source.
The equatorial coordinate system is probably the most widely used celestial coordinate system, whose equatorial coordinates are: declination () right ascension () or hour angle () It is the most closely related to the geographic coordinate system, because they use the same fundamental plane, and the same poles.
Many galaxies, including the Milky Way in which our Sun and Earth are located, are disk-shaped: the majority of their visible mass (excluding possible dark matter) lies very close to a plane.
www.nationmaster.com /encyclopedia/Galactic-center   (905 words)

 Open Letter piece - The Maya and the Galactic Center   (Site not responding. Last check: 2007-10-20)
The cross symbol, according to accepted epigraphic and iconographic interpretation (e.g., on thrones), denotes the concept of “center” and usually contextually implies a “cosmic” or “celestial” center.
The concept of “cosmic center” and the principle of  world-centering was important to Mesoamerican astronomers, city planners, and Maya kings — kings who symbolically occupied and ruled from the “cosmic center.” Thus, the Maya, via the Sacred Tree/Cosmic Cross symbology, understood the region of the Galactic Center to be a center.
I speak of “region” in referring to the Galactic Center because the visible “nuclear bulge” of the Galactic Center is not an abstract, invisible point, is not limited to the high frequency radio spectrum, but rather covers a large area or “region” in the visible night sky.
www.alignment2012.com /openletter.htm   (926 words)

 Galactic Center   (Site not responding. Last check: 2007-10-20)
Because of cool interstellar dust along the of sight the Galactic Center cannot be at visible ultraviolet or soft X-ray wavelengths.
The complex radio source Sagittarius A appears to be located almost exactly the Galactic Center and contains an intense radio source Sagittarius A* which many astronomers may be a fl hole at the center of our galaxy.
The Gravitational force perpendicular to the galactic plane: A meeting held at the Center for Galactic Astronomy, Western Connecticut State University...
www.freeglossary.com /Galactic_Center   (375 words)

 Galactic Center Disinformation
Stanley apparently did not reference LaViolette's scientific papers which describe evidence of Galactic cosmic ray superwaves being emitted from the Galactic center, each outwardly moving superwave shell producing a ring of electromagnetic radiation concentric with the Galactic center and lying along the galactic plane, accompanying the superwave as it travels outward.
There is evidence that the Sun orbits the Galactic center (Sagittarius A*) once in about 200 million years, the Galactic center being situated in a direction opposite from the Pleiades in the direction of the Sagittarius and Scorpio constellations.
In these parts she describes the photon band as originating from a region on the side of the Earth opposite to the Galactic center, hence approaching from a direction exactly opposite from the direction that superwaves would approach.
www.etheric.com /LaViolette/Disinformation.html   (1897 words)

 Galactic Core Explosions and their hazardous effects on the Earth
Galactic core outbursts are the most energetic phenomenon taking place in the universe.
Infrared image of the Galactic center radio-emitting source Sagittarius A* seen at a wavelength of 8.7 microns (red spot marked as GC).
But, with the arrival of this Galactic cosmic ray volley, the solar wind was overpowered and large quantities of this material were pushed inward.
www.etheric.com /GalacticCenter/Galactic.html   (634 words)

 The Milky Way Galaxy   (Site not responding. Last check: 2007-10-20)
X-ray and gamma-ray observations show that the Galactic Center region is a strong source of x-rays and also gamma-rays from the annihilation of antimatter.
Although there is no lack of fascinating questions about the Galactic Center, recent interest has been focused on the question of the possibility that a massive fl hole exists at the center of the central star cluster.
The presence of very high velocities in the stars and gas near the center of the galaxy has suggested to astronomers for a long time that a massive fl hole might be present, providing a strong enough gravitational pull to keep the stars and gas in orbit.
cassfos02.ucsd.edu /public/tutorial/MW.html   (990 words)

 APOD Search Results for "galactic center"   (Site not responding. Last check: 2007-10-20)
Explanation: Indicated on this infrared image of the galactic center region is the position of SGR 1900+14 - the strongest known magnet in the galaxy.
The center itself appears as a bright spot near the middle of the roughly 1x3 degree field of view, the plane of the Galaxy is vertical, and the north galactic pole is towards the right.
The Galactic plane is horizontal, passing through the Galactic center in the middle of the picture, as indicated by the superposed coordinate grid.
cassfos02.ucsd.edu /public/tutorial/html/apod_gc.html   (4897 words)

 Galactic Center   (Site not responding. Last check: 2007-10-20)
High-resolution image of the center of the Galaxy at a wavelength of 2 microns, made with the Keck Telescope.
The region outlined at the center immediately surrounds the location of the Galaxy's central, supermassive fl hole, and is displayed to an order of magnitude greater depth than the rest of the image.
Recent measurements, of the velocities of stars near the center of the Milky Way have provided the strongest evidence for the presence of a supermassive fl hole in a galaxy, but the observational uncertainties poorly constrain many of the properties of the fl hole.
www.astro.ucla.edu /%7Eghez/gc_nat.html   (392 words)

 Probing the Galactic Center (1Mar95)
The Galactic Center is, however, heavily obscured by the intervening dust lying in the plane of our galaxy, so that at visible wavelengths it is unobservable.
The presence of luminous M supergiants supports the idea that there is active star formation at the Galactic Center, and the detection of infrared He I and H I emission point sources without radio counterparts (which thus must be stellar or extremely compact) offers plausible candidates for young, hot stars.
Spectra were taken in the K (1.9-2.4 um) band for eight Galactic Center He I sources and a number of galactic and LMC comparison stars; spectra were also taken in the H (1.45-1.85 um) band for one of the Galactic Center sources (the so-called AF or AHH source) and for the comparison stars.
www.noao.edu /noao/noaonews/mar95/art3.html   (1008 words)

 Galactic Center (Page 4)   (Site not responding. Last check: 2007-10-20)
Galactic Center activity occurs frequently between major superwave events.
History of minor Galactic Center explosion activity during the past 6000 years; approximate dates when radiation pulses arrived from the Galactic Center.
The Starburst Foundation is a scientific research institute dedicated to discovering how Galactic superwaves have affected our planet in the past, to implementing an international early-warning system for future events, and to investigating ways of lessening the adverse effects of superwaves on our planet.
home.earthlink.net /~gravitics/GalacticCenter/Galactic4.html   (1001 words)

 The Galactic Center (26 Sagittarius)
Their inner dynamic is centered around feeling as if they have come to this planet from some other place.
Planets in aspect to the Galactic Center are certainly energized, and can be among the strongest planets in the chart.
Perhaps with this new cycle, it is time for most astrologers to begin adding the Galactic Center to their clients' charts.
www.horary.com /hhcrl/galact.html   (974 words)

 The Distance to the Galactic Center
More importantly, he determined the Galactic Center to be located in the constellation of Sagittarius, by mapping out the three dimensional distribution of the clusters.
Directly observing the Galactic Center has been difficult for optical astronomers, as it is shrouded in gas and dust that is impenetrable by visible light.
In the case of the stars in the Galactic Center, however, they are clearly in orbit around a point mass, a fl hole.
www.astrophys-assist.com /educate/distance/distance_gc.htm   (1074 words)

 The Galactic Center
The "mini-cavity" in the center is a bubble that has apparently been evacuated of dust and gas.
The Galactic Center is completely invisible due to the large amounts of dust lying along our line of sight.
At these wavelengths, stars at the distance of the Center are bright enough to be visible (unlike at mid-infrared wavelengths), but the dust is too cold to be detected.
irastro.jpl.nasa.gov /GalCen/galcen.html   (977 words)

 APOD: 2002 August 3 - The Galactic Center A Radio Mystery   (Site not responding. Last check: 2007-10-20)
The galactic center itself is at the edge of the extremely bright object labeled Sagittarius (Sgr) A, suspected of harboring a million solar mass fl hole.
Along the galactic plane which runs diagonally through the image are tortured clouds of gas energized by hot stars and bubble-shaped supernova remnants (SNRs) - hallmarks of a violent and energetic cosmic environment.
Their uncertain origins challenge present theories of the dynamics of the galactic center.
antwrp.gsfc.nasa.gov /apod/ap020803.html   (174 words)

 Galactic Alignment
Likewise, my work has sought to break the bubble again so that we might recognize an even higher center, the Galactic Center, and integrate it into conventional thought as a fundamental player in the affairs of Earth.
Galactic Alignment: The Transformation of Consciousness According to Mayan, Egyptian, and Vedic Traditions is more ambitious than I intended it to be.
In that book, I identified the rare alignment of the December solstice sun with the Galactic Center as the reason why the Maya chose to end their 13-baktun calendar on December 21, 2012.
www.portalmarket.com /alignment2012.html   (524 words)

Galactic Center Workshop 2002 took place during November 3-8, 2002 on the Big Island of Hawai'i.
The conference was co-sponsored by Gemini Observatory, the Institute for Astronomy of the University of Hawai'i, the Subaru Telescope, The Joint Astronomy Centre, the W. Keck Observatory, and the Sub-Millimeter Array.
We organized this conference to review recent research on the galactic center, including the latest state-of-the-art observations and important theoretical developments.
www.gemini.edu /science/gc_conf   (237 words)

 SPACE.com -- Death Stars: Sterilizing the Galactic Center
The galactic center is so dense with bright, hot stars that several can be seen through the cloudy twilight.
The star formation peaks at the galactic center are caused by an inflow of gas from a ring of material about 500 light-years from the middle.
The ring forms due to the gravitational forces in a galactic bar, which is a rotating oval of stars 6,000 light years long, also in the center of the Milky Way.
www.space.com /scienceastronomy/starburst_sterilization_041007.html   (771 words)

 Distance to the Galactic Center   (Site not responding. Last check: 2007-10-20)
By locating the center of distribution of globulars, Shapley was able to conclude—in 1918—that the galactic center was located not in our own region, but in the direction of the constellation Sagittarius, at a distance of about 50,000 light-years (a value of R
The galactic center has been found to be obscured by dense clouds of dust that dim visible light in the order of at least 28 magnitudes (equivalent to a factor of 1:10
The galactic nucleus itself seems to be occupied by a compact, extremely massive object—very probably a fl hole—which emits strongly in the radio frequencies, and is known as Sagittarius A* (read: "Sagittarius A-star").
www.armandocaussade.com /astronomy/galactic_center.html   (1645 words)

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