optical tracers
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2019 ◽  
Vol 4 (9) ◽  
pp. 1900300 ◽  
Author(s):  
Stephan Müssig ◽  
Florian Fidler ◽  
Daniel Haddad ◽  
Karl‐Heinz Hiller ◽  
Susanne Wintzheimer ◽  
...  

2019 ◽  
Vol 60 (3) ◽  
pp. 418-423 ◽  
Author(s):  
Matthijs D. Linssen ◽  
Eva J. ter Weele ◽  
Derk P. Allersma ◽  
Marjolijn N. Lub-de Hooge ◽  
Gooitzen M. van Dam ◽  
...  

Author(s):  
A. Marco ◽  
I. Negueruela ◽  
G. Bernabeu
Keyword(s):  

1998 ◽  
Vol 179 ◽  
pp. 332-334
Author(s):  
K.Y. Stavrev

This paper is part of a more extensive study of the large voids in spatial volumes both wide and deep. Three samples of optical tracers with spectroscopically measured redshifts in a volume with b≥30° and z≤0.14 have been extracted from the catalogue of Lebedev and Lebedeva (1986) and the NASA/IPAC Extragalactic Database (NED): (1)a homogeneous sample of 277 rich Abell clusters(2)an inhomogeneous sample of 969 objects: rich and poor Abell clusters, Zwicky clusters, other clusters, and groups(3)a sample of 18 623 NED galaxies.


1990 ◽  
Vol 355 ◽  
pp. 52 ◽  
Author(s):  
Bruce G. Elmegreen ◽  
Debra Meloy Elmegreen
Keyword(s):  

1989 ◽  
Vol 94 (A6) ◽  
pp. 7003-7010 ◽  
Author(s):  
Paul A. Bernhardt ◽  
L. M. Duncan ◽  
C. A. Tepley

1985 ◽  
Vol 106 ◽  
pp. 423-430
Author(s):  
Paul Hodge

A comparison of some of the basic properties of M31 and the Milky Way indicates that in almost every respect M31 is larger than the Galaxy. It is more luminous, redder, more massive, and of earlier Hubble type. A detailed comparison of the spiral structure, based on optical tracers, for comparable areas in the outer parts of each galaxy shows differences in the arm spacings, in density enhancement, and in pitch angle.


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