Akademik Veri Yönetim Sistemi
Tezin Türü: Yüksek Lisans
Tezin Yürütüldüğü Kurum: Van Yüzüncü Yıl Üniversitesi, Fen Fakültesi, Fizik Bölümü, Türkiye
Tezin Onay Tarihi: 2022
Tezin Dili: Türkçe
Öğrenci: Gamze YANIK
Danışman: Selçuk Topal
Özet:
Given the ubiquitous amount of molecular gas they have and thus the high rate of star formation activity, the spiral galaxies are one of the only galaxy types studied to understand the evolution of stars and galaxies, and also the structure and kinematics of galaxies. In this thesis, the physics of the interstellar gas and dust were investigated through the whole disk of the spiral galaxy NGC 3938, and, additionally, in selected 20 positions over the disk. The literature data obtained within the scope of this thesis includes carbon monoxide (CO) transitions [12CO(1-0, 2-1, 3-2) and 13CO(1-0)], infrared (, ve ) and ultraviolet (FUV) data. Total CO flux, molecular gas mass, gas surface density, CO flux ratios [12CO(1-0)/13CO(1-0), 12CO(2-1)/12CO(1-0), and 12CO(3-2)/12CO(1-0)], infrared and FUV flux densities, the interstellar extinction values, and finally the ratio of HCN/12CO(1-0) at the center of the galaxy were calculated. Our results indicate that CO gas shows a regular distribution over the galaxy. The dense gas fraction in the center of the galaxy could be less than in other spiral galaxies. As one moves from the center of the galaxy to the outskirts of the disk, except for the unevenly distributed average temperature, the infrared and ultraviolet emissions decrease, along with the total CO flux, the extinction, and sparseness of the gas. Compared to other infrared and ultraviolet emissions, the 24-micron emission has a stronger negative correlation with distance from the galaxy center. In this study, the molecular gas complexes in the NGC 3938 were examined in greater detail than ever before using the data in mm, infrared, and ultraviolet wavelength regimes. This study also sheds light on high-resolution studies in the future.