#TITLE_ALTERNATIVE#

• Main Author: HUSNINDRIANI (NIM: 10308016); Pembimbing : Dr. rer. nat. Hesti R. T. Wulandari, PRAHESTI
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/16829
• Institution: Institut Teknologi Bandung

Information about the existence of dark matter, in the beginning known as missing mass, was firstly proposed by Fritz Zwicky in 1933 through his research about mass estimation in Coma cluster. Since then, astronomers started to study distribution of dark matter in large scales, ranging from galaxies, galaxy clusters, and universe as a whole. <br /> <br /> <br /> <br /> <br /> <br /> <br /> One of interesting research about dark matter is its distribution in spiral galaxies. In this final project, I attempted to estimate distribution of dark matter in Sb and Sc type spiral galaxies by means of three mass decomposition methods, namely model of spiral galaxy rotation curve for each component, mass decomposition method based on disk kinematics out to optical radius <br /> <br /> <br /> <br /> <br /> <br /> <br /> (Ropt) (Persic and Salucci, 1990), and Universal Rotation Curve I (Persic, Salucci, and Stel, 1996). In addition, I examined Universal Rotation Curve(URC) out to 2Ropt and virial radius (Rvir) based on Universal Rotation Curve <br /> <br /> <br /> <br /> <br /> <br /> <br /> II (Salucci et al., 2007). <br /> <br /> <br /> <br /> <br /> <br /> <br /> Results show that for mass decomposition, the accuracy of scale-length (RD) and luminosity parameters are highly important. In mass decomposition with model of rotation curve, the value of RD will determine the pattern <br /> <br /> <br /> <br /> <br /> <br /> <br /> of rotation curve which can be fitted to the observed rotation curve. This will absolutely affect calculation of rotation curve slope in Ropt from mass decomposition method based on disk kinematics which has direct relation to dark matter distribution in that particular radius. <br /> <br /> <br /> <br /> <br /> <br /> <br /> In URC I and II, the values of luminosity and virial mass (Mvir) will determine the URCs of samples. Furthermore, the velocity in optical radius (Vopt will in <br /> <br /> <br /> <br /> <br /> <br /> <br /> uence the amplitude of URC I from samples as well.