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Topic: Gigaparsec

	Light year - Wikipedia, the free encyclopedia
		The figures differ because distant objects have continued to recede from us due to cosmological expansion (see Hubble's law).
		One gigaparsec is equal to approximately 3.26 billion light years.
		This audio file was created from an article revision dated 2005-06-27, and does not reflect subsequent edits to the article.
	en.wikipedia.org /wiki/Light_year (516 words)

	DISCUSSION (Site not responding. Last check: 2007-09-19)
		The observed distribution is automatically satisfied if we adopt cosmological distance scale: all objects detectable at cosmological distances are distributed isotropically in the sky, and the number density of all of them appears to decrease at sufficiently large distances as a consequence of the redshift.
		Gigaparsec is any higher than was the quality of the disk models: none is nearly good enough to be really trusted.
		The author(s) always have some specific model in mind when a claim is made that the model could not possibly give rise to a burst at a distance of a few Gigaparsecs.
	antwrp.gsfc.nasa.gov /diamond_jubilee/papers/pac/node5.html (2655 words)

	From Megaparsecs to Gigaparsecs: The Clustering of Photometric Luminous Red Galaxies and its Cosmological Implications ... (Site not responding. Last check: 2007-09-19)
		From Megaparsecs to Gigaparsecs: The Clustering of Photometric Luminous Red Galaxies and its Cosmological Implications / Events and Calendar / CITA
		From Megaparsecs to Gigaparsecs: The Clustering of Photometric Luminous Red Galaxies and its Cosmological Implications
		We find evidence for power on gigaparsec scales, as well as evidence for baryonic oscillations in the power spectrum.
	www.cita.utoronto.ca /index.php/events_calendar/from_megaparsecs_to_gigaparsecs_the_clustering_of_photometric_luminous_red_galaxies_and_its_cosmological_implications (153 words)

	The Astrophysics Spectator: Distances beyond our Galaxy
		These distances are measured by observing the brightness of objects of known luminosity.
		This scale is around 5,000 Mpc, or 5 gigaparsecs (Gpc).
		The scale of the observable universe is therefore 300 thousand times the scale of our Galaxy, which is comparable to the ratio of the distance to the nearest stars to the semi-major axis of Earth's orbit.
	www.astrophysicsspectator.com /topics/overview/DistanceExtragalacticScale.html (546 words)

	Catholic Apologetics International - Robert Sungenis
		If the galaxy were a gigaparsec from us (which is 1000 megaparsecs), it must recede with a velocity of 100,000 kilometers per second.
		Lo and behold, as more powerful telescopes were built, one of them, ironically, being the Hubble Space telescope, the universe Hubble saw in 1929 was dwarfed by what men were discovering in the 1970s through 1990s (at least with the formulas they currently use to measure astral distances).
		The very Einsteinian theory that gave them the expanding universe was now faced with a universe that was, as it were, too big for its britches, and which ends up contradicting Einstein's most cherished fact of life - that nothing can go faster than the speed of light.
	www.catholicintl.com /epologetics/articles/science/earth-young-old4.htm (2367 words)

	CERN Courier - Gamma-ray bursts made by sup - IOP Publishing - article
		The temporal and directional coincidence of the two objects suggested that they may be physically associated.
		The distance to SN1998bw is a mere 39 megaparsecs (redshift z = 0.0085), a trifle compared with the gigaparsec distances to other GRBs located at much larger redshifts.
		Yet the gamma-ray flux from GRB980425 was comparable to that of others and not orders of magnitude larger, as would be expected from a spherical emission from the nearby location of SN1998bw.
	www.cerncourier.com /main/article/43/5/1 (831 words)

	iqexpand.com (Site not responding. Last check: 2007-09-19)
		Assuming all of mass M of the lensing galaxy is concentrated in the center it can be expressed (shown below) in terms of the distance NaodW29-math704a23a66542a5e500000001 to the lens L, the distance NaodW29-math704a23a66542a5e500000002 to the source S and the distance between the source and the lens NaodW29-math704a23a66542a5e500000003 as
		In the latter form the mass is expressed in solar masses NaodW29-math704a23a66542a5e500000006 and the distances in Gigaparsec (Gpc).
		For a dense cluster with mass NaodW29-math704a23a66542a5e500000007 at a distance of 1 Gigaparsec (1 Gpc) this radius could be as large as 100 arcsec (called macrolensing).
	einstein_ring.iqexpand.com /index.php?title=Einstein_ring&action=history (1327 words)

	Determining Distances to Astronomical Objects
		This method was used to determine the distance to the quasar 3C 279 (Homan 2000)"; it turned out to be between 1.5 and 2.3 Gigaparsec away.
		A gigaparsec is a billion parsecs so that distance corresponds to approximately 6 billion light years.
		The problem with this method is that one needs to know additional parameters, for example the angle of the movement to the line of sight, in order to get a meaningful answer.
	www.talkorigins.org /faqs/astronomy/distance.html (6828 words)

	EGRET (Site not responding. Last check: 2007-09-19)
		Believed to be supermassive fl holes accreting nearby matter.
		GRBs are brief, intense gamma-ray emissions from an unknown source at a cosmological (gigaparsec) distance.
		Pulsars are a type of magnetized star with an emission beam that sweeps around as it rotates.
	www.astro.columbia.edu /~muk/students/dana/page2.html (205 words)

	Measuring Distances Using Parallax
		Depending on your professor, you might hear the words Parsec, kiloparsec, Megaparsec and even Gigaparsec in your lecture classes.
		A Megaparsec is one million parsecs, and a Gigaparsec is one billion parsecs.
		To convert to light years, you simply have to multiply by 3.26.
	ganymede.nmsu.edu /astro/a110labs/labmanual/node8.html (3129 words)

	Ask Us A Question (Site not responding. Last check: 2007-09-19)
		The nearest large galaxy cluster, the Virgo Cluster, is about 18 megaparsecs away.
		The particle horizon (observable part) of the universe has a radius of about 14 gigaparsecs.
		How to calculate the value of a parsec
	www.avoo.com /wiki/Parsec (730 words)

	Measurements, Units of Measurement, Weights and Measures - Numericana
		Big ones: gigaparsec (Gpc; over 3 thousand million light-years), hubble (a thousand million light-years), megaparsec (Mpc), kiloparsec (kpc), parsec (pc = 3.261563378 light-years), light-year.
		Only the parsec (pc) and its multiples are official SI units (the light-year is not): By definition, the parsec is the radius of a circle for which an arc of one second has a length of one astronomical unit (AU).
		The radius of the observable Universe itself is about 4 Gpc, so there is no need for units larger than the gigaparsec.
	home.att.net /~numericana/answer/units.htm (10387 words)

	A Nuclear Renaissance? (Site not responding. Last check: 2007-09-19)
		Releasing effluents to Canada is really off the scale on the Ridiculous Meter.
		Even a crude model for dispersion would show that you're down into the attocurie per cubic gigaparsec concentration range for the TMI source term, within a few tens of miles of the release point.
		I doubt that the thought of Canada as a measurable dose zone ever crossed the minds of any accident analysts or emergency planners.
	www.freerepublic.com /focus/f-news/1107908/posts (2211 words)

	Space Eater — Zerps - Halloween Style - Advanced Physics Forums (Site not responding. Last check: 2007-09-19)
		I think you're thinking of the large-scale structure of the universe, superclusters and voids and filaments and walls and such.
		Dark matter distribution on the scale of a single galaxy is smooth and roughly spherical, but on the gigaparsec scale, it's all wisps and strands and filaments.
		See, for example, this page with pretty renderings of the galaxy redshift survey SDSS.
	www.advancedphysics.org /forum/showthread.php?t=2721 (882 words)

	SIGGRAPH 2000 Media: Computer Animation Festival Fact Sheet
		It begins with the real-time-rendered Milky Way, then pulls out to reveal its neighboring pre-rendered galaxies as outlying members of the Virgo Supercluster, the densest group in the filament that dominates this view drawn from Brent Tully's 3D catalog of 30,000 nearby galaxies.
		For still larger scales, views based on Ostriker and Bode's gigaparsec dark-matter simulation, show the universe as a form of condensed filaments and knots surrounded by vast voids.
		Muybridge recorded motion of human and animals in multiple photographs.
	www.siggraph.org /s2000/media/facts/at.html (4345 words)

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