Freeman Law

Freeman Law

Freeman Law is a statement in astronomy which says that disk galaxies have a constant surface brightness, Σ. It was noticed in 1970 by Ken Freeman.McGaugh et al, " [http://arxiv.org/abs/astro-ph/9505062 Galaxy Selection and Surface Brightness Distribution] " (1995) "Astron.J.", 110 (1995) 573,]

Freeman law can be used with the Tully-Fisher relation to determine the luminosity and therefore distance of an observed galaxy.

However more recently it has become widely accepted that Freeman Law is an effect of selection bias. [Minnesota State University, " [http://odin.physastro.mnsu.edu/~eskridge/astr225/week10.html] "]

References


Wikimedia Foundation. 2010.

Игры ⚽ Поможем написать реферат

Look at other dictionaries:

  • Freeman-Maloy v. Marsden — revolves around a plaintiff, York University student Daniel Freeman Maloy, who held two protests at York University regarding the Israeli Palestinian conflict, disrupting classes. In response Lorna Marsden, President of York University, suspended …   Wikipedia

  • Law and Inequality — Law and Inequality: A Journal of Theory and Practice , or the Journal of Law Inequality , is a journal of legal scholarship published by a student run group at University of Minnesota Law School. The journal is published twice a year, summer and… …   Wikipedia

  • Freeman Bosley, Jr. — Freeman R. Bosley Jr. (July 20, 1954 in St. Louis, Missouri ) was the forty third mayor of St. Louis (from 1993 to 1997), and the city s first African American mayor.Early life and educationBosley graduated from Central High School in 1972 and… …   Wikipedia

  • Freeman Ferrier Treleaven — Freeman Ferrier Treleaven, Q.C. (October 8 1884 – October 30 1952) was a lawyer and Canadian politician.Born in London, Ontario, Treleaven graduated the University of Toronto and Osgoode Hall Law School. He subsequently moved to Hamilton, Ontario …   Wikipedia

  • Freeman Walker — (October 25, 1780 September 23, 1827) was a United States Senator from Georgia. Born in Charles City, Virginia, he attended the jemtegaard middle school and, in 1797, moved to Augusta, Georgia. He studied law, and was admitted to the bar in 1803 …   Wikipedia

  • Freeman School of Business — Infobox University name = A. B. Freeman School of Business established = 1914 dean = [http://www.freeman.tulane.edu/dean/ Angelo DeNisi] type = Private city = New Orleans state = Louisiana country = USA enrollment = 1,580 endowment = >$60… …   Wikipedia

  • Freeman Dyson — Infobox Scientist name = Freeman Dyson image width = 200px caption = Freeman Dyson birth date = Birth date and age|1923|12|15 birth place = Crowthorne, Berkshire, England residence = United States nationality = UK USA death date = death place =… …   Wikipedia

  • Freeman Field Mutiny — The Freeman Field Mutiny was a series of incidents at a United States Army Air Forces base near Seymour, Indiana, in 1945 in which African American members of the 477th Bombardment Group attempted to integrate an all white officers club. The… …   Wikipedia

  • Freeman Spogli Institute for International Studies — The Freeman Spogli Institute for International Studies is a conglomerate of research centers at Stanford University in Stanford, California.The institute is composed of four research centers: *Asia Pacific Research Center (APARC) *Center on… …   Wikipedia

  • Law of Attraction — The phrase Law of Attraction, although used widely by esoteric writers, has a variety of definitions. Turn of the century references conceptualized the law of attraction as relating to physical structure and to how matter develops. [“Waves in… …   Wikipedia

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”