The Two-dimensional Photometric Decomposition Of Nearby Massive Disk Galaxies

The theory of galaxy formation and evolution thinks that the cessation of star formation activities in galaxies is accompanied by a morphological transformation from disk galaxies into ellipticals.The presence of massive red disk galaxies challenges this scenario.It was found that red disk galaxies possess prominent bulges,which was considered to be a probe for morphological quenching.However,the analysis was based on data from a simple bulge+disk decomposition.In this thesis,the multi-band and multi-component two-dimensional image decomposition will be used to study the physical properties of massive red disk galaxies,in comparison with massive blue disk galaxies..The galaxy sample consists of 22 red,10 high ?1 blue and 40 low ?1 blue disk galaxyes in the redshift range of 0.0210.5.Upon the bulge+disk model,we take into account the contributions from bars,lenses,rings and spiral arms in the two-dimensional image decomposition.The g,r and i band images from the Sloan Digital Sky Survey Data Release 7 were fitted simultaneously.It is found that the combinations of any two of the g,r and i bands produce consistent stellar mass estimates.The massive red disk galaxies are similar to the high ?l blue disk galaxies in all the visited properties,i.e.,the bulge-tototal stellar mass ratio,the stellar mass-size relations and stellar mass-color diagrams followed by bulges and disks.This reinforces the possible evolutionary connection between these two types of galaxies.Compared with the results based solely on the simple bulge+disk model,the bulge-to-total stellar mass ratios(B/T)obtained in this thesis are smaller.This rules out the possibility that morphological quenching is responsible for the quenching of red disk galaxies.This also confirms the importance of considering more detailed models in the two-dimensional image decomposition.