Galactic spheroid - Factbites

Galactic spheroid - Factbites
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Topic: Galactic spheroid

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	num_mod.html
		The stellar surface density is determined by the spatial contributions from the Galactic disk and spheroid populations.
		Recall that it is measured from the Galactic center in the plane of the disk, and that R is measured from the Sun to the source (or viewing direction).
		Their stellar surface density simulations include the disk and spheroid populations, as well as a third, "intermediate" population which contains metal-poor subdwarf stars with a z-distribution characteristic of a thick disk (Reid 1983).
	spider.ipac.caltech.edu /staff/jarrett/num_mod/num_mod.html (3961 words)

	Aerospace Science and Technology Dictionary G Page
		Alternatively, the datum may be considered as three rectangular coordinates fixing the origin of a coordinate system whose orientation is determined by the fixed stars, and the reference spheroid is an arbitrary coordinate surface of an orbiting ellipsoidal coordinate system.
		An astronomical coordinate system using latitude measured north and south from the galactic equator and longitude measured in the sense of increasing right ascension from 0 to 360 degrees.
		Either of two antipodal points marking the intersection of the earth's surface with the extended axis of a dipole assumed to be located at the center of the earth and approximating the source of the actual magnetic field of the earth.
	www.hq.nasa.gov /office/hqlibrary/aerospacedictionary/508/g.html (3961 words)

	USIGS Definitions and Descriptions - G
		It is everywhere 90° from the galactic poles.
		Angular distance north or south of the galactic equator; the arc of a great circle through the galactic poles, between the galactic equator and a point on the celestial sphere, measured northward or southward from the galactic equator through 90° and labeled "N" or "S" to indicate the direction of measurement.
		The quantities of latitude, longitude, and height (ellipsoid), which define the position of a point on the surface of the Earth with respect to the reference spheroid.
	www.fas.org /irp/agency/nima/nug/gloss_g.html (3961 words)

	The accreted component of the Galactic Halo: The Sagittarius Dwarf Spheroidal
		The main body of Sgr dSph orbits well within the Galactic spheroid (R
		We have demonstrated that the observed phase-space clustering is statistically significant, thus indicating that Sgr has left behind in the Galactic halo not only a stream of stars but also some globular clusters.
		Thus, the Sgr dSph is (and has been) one of the major contributors to the stellar content of the whole Galactic Halo.
	www.bo.astro.it /report03/node17.html (500 words)

	Spiral galaxy - Wikipedia, the free encyclopedia
		The disks of spiral galaxies tend to be surrounded by large spheroid halos of Population II stars, many of which are concentrated in globular clusters that orbit the galactic center.
		Since the speed of rotation of the galactic disk varies with distance from the centre of the galaxy, a radial arm (like a spoke) would quickly become curved as the galaxy rotates.
		The arm would, after a few galactic rotations, become increasingly curved and wind around the galaxy ever tighter.
	en.wikipedia.org /wiki/Spiral_galaxy (500 words)

	2001A Program Abstracts
		Recent observations of QSO host galaxies, together with the supposition that there is a good correlation between the mass of the galactic spheroid and the mass of the accreting black hole, support this idea.
		Consequently, black-hole and spheroid formation/growth are recognised as intimately-related processes, with the evolution of quasar host galaxies as a function of redshift now seen as a key measurement in observational cosmology.
		The infrared colors of the host galaxy may help to constrain the stellar population of the host galaxy and from the colors of the companions we will be able to detect evidence of recent star formation, obtaining mass and ages for the starbursts.
	www.us-gemini.noao.edu /sciops/schedules/2001Aabstracts/abstracts.html (500 words)

	Spiral galaxy - Wikipedia, the free encyclopedia
		The disks of spiral galaxies tend to be surrounded by large spheroid halos of Population II stars, many of which are concentrated in globular clusters that orbit the galactic center.
		Spiral galaxies are so named due to the bright arms of star formation within the disk that extend—roughly logarithmically—from the bulge.
		Our galaxy, the Milky Way, has long been thought to be a spiral, with a Hubble sequence classification of Sbc (possibly SBb); recent research, however, suggests that it may in fact be a barred spiral.
	en.wikipedia.org /wiki/Spiral_galaxy (479 words)

	Spiral galaxy - Wikipedia, the free encyclopedia
		The disks of spiral galaxies tend to be surrounded by large spheroid halos of Population II stars, many of which are concentrated in globular clusters that orbit the galactic center.
		Spiral galaxies are so named due to the bright arms of star formation within the disk that extend—roughly logarithmically—from the bulge.
		Our galaxy, the Milky Way, has long been thought to be a spiral, with a Hubble sequence classification of Sbc (possibly SBb); recent research, however, suggests that it may in fact be a barred spiral.
	en.wikipedia.org /wiki/Spiral_galaxy (483 words)

	Reference.com/Encyclopedia/Milky Way
		The galactic disk is surrounded by a spheroid halo of old stars and globular clusters.
		Outside of these is the Outer Ring or Monoceros Ring, a ring of stars around the Milky Way proposed by astronomers Brian Yanny and Heidi Jo Newberg.
		This ring consists of gas and stars torn from other galaxies as they merged with our own billions of years ago.
	www.reference.com /browse/wiki/Milky_Way (1435 words)

	Recent Preprints and Papers
		The Proper Motion of the Ursa Minor Dwarf Spheroidal Galaxy, Schweitzer, A. E., Cudworth, K. & Majewski, S. 1997, in ``Proper Motion Surveys and Galactic Astronomy", ed.
		Absolute Proper Motion and a Membership Survey of the Sculptor Dwarf Spheroidal Galaxy, Schweitzer, A. E., Cudworth, K. M., Majewski, S. & Suntzeff, N. The Intermediate Population II -- Extended, High Velocity, Metal-Weak, Thick Disk -- Inner, Flattened Spheroid -- Lower, Contracted Halo, Majewski, S. R., 1995, in "The Formation of the Milky Way", eds.
		A Possible Detection of the Sagittarius Dwarf Spheroidal Galaxy at b=-40 Degrees, Majewski.
	www.astro.virginia.edu /~srm4n/papers.html (1369 words)

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