ORBi: Gosset Eric - A search for quasars in a field around NGC 520

Reference : A search for quasars in a field around NGC 520


	Document type :	Scientific journals : Article
	Discipline(s) :	Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
	To cite this reference:	http://hdl.handle.net/2268/32952

Title :	A search for quasars in a field around NGC 520
Language :	English
Author, co-author :	Gosset, Eric [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Groupe d'astrophysique des hautes énergies (GAPHE) >]
	Clowes, R. G. [Royal Observatory, Edinburgh, Scotland]
	Surdej, Jean [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS) >]
	Swings, Jean-Pierre [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Département d'astrophys., géophysique et océanographie (AGO) >]
Publication date :	1-Jul-1990
Journal title :	Monthly Notices of the Royal Astronomical Society
Publisher :	Blackwell Publishing
Volume :	245
Pages :	71-81
Peer reviewed :	Yes (verified by ORBi)
Audience :	International
ISSN :	0035-8711
City :	Oxford
Country :	United Kingdom
Keywords :	[en] QUASARS ; SKY SURVEYS (ASTRONOMY) ; ASTRONOMICAL PHOTOGRAPHY ; COMPUTATIONAL ASTROPHYSICS ; COMPUTER PROGRAMS ; IMAGE ANALYSIS ; SPATIAL DISTRIBUTION
Abstract :	[en] An objective-prism search for quasars was performed in a field around the galaxy NGC 520. The automated quasar detection software has been applied, and a sample of 175 highly rated quasar candidates has been selected. The two- and three-dimensional distributions of the candidates have been analyzed. The distribution on the celestial sphere turns out to be nonrandom. The deviations from randomness are both a tendency to exhibit anticorrelation at the scale of a few arcmin and a significant excess of objects at separations of about 20 arcmin. Finally, in order to test the claims by Arp and Duhalde (1985) that an excess of quasars exists near NGC 520 and that there is a preferential NE-SW alignment of bright quasars across this amorphous galaxy, various statistical analyses of the distribution of the high-grade quasar candidates with respect to NGC 520 were performed. No sign of any possible relation is present in the data.
Target :	Researchers ; Professionals
Permalink :	http://hdl.handle.net/2268/32952
Other URL :	http://adsabs.harvard.edu/abs/1990MNRAS.245...71G
Mentions required by the publisher for OA :	The authors thank SAO/NASA ADS Astronomy Abstract Service for their deposit authorization and Blackwell Publishing for publication. The definitive version is available at www.blackwell-synergy.com

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