The Equivalent Thickness of 20 Spiral Galaxies
This paper investigates the equivalent thicknesses of 20 non-edge-on spiral galaxies,and some other parameters,such as forbidden radius,pitch angle and arm's inclination.Basced on the logarithm spiral,we obtained those parameters.We compared the new method with the old method,and also analyzed the result.We hoped those parameters were helpful for the future galaxy study.
Abstract In this paper we have investigated Kaluza-Klein type 5–dimensional model of universe with a flat geometry filled with viscous fluid in the presence of variable cosmological term Λ. A non-singular solution leading to a variable deceleration parameter is obtained which reduces to the solution of Murphy (1973) in the absence of Λ and also reduces to the solutions of Vishwakarma (2002) in the absence of viscosity.