AST-299 Characterization of BreakBRD-type galaxies sample

Abstract

BreakBRD (break bulge in red disk) galaxies are a new sample of spiral galaxies presented in Tuttle and Tonnesen (2020), these galaxies have a red disk, but concentrated star formation, measured by Dn4000. In this thesis work we search for galaxies with morphological characteristics such as breakBRD through a visual classification of high resolution RGB images obtained from the observations of the Hyper Suprime Cam Telescope, from its Public Data Release 3. The galaxies are within groups/clusters with masses M⊙ ≥ 1013 and a cut in the redshift z ≤ 0.2, the observed host corresponds to the RXGCC survey. We found 154 breakBRD galaxy candidates (approximately 5.55%), corrected their photometry to study their Color magnitude diagram, calculated their stellar masses, compared our sample with the Chang 2015 catalog and found that a large part of our sample is in the star-forming region with a percentage transitioning to the green valley. We used the X-ray survey measurements to study that the mass of the group/cluster does not affect the number of candidates, suggesting that not only environmental effects produce this state. The stellar masses are distributed in a range 109 ≤ M⊙ ≤ 1011, which indicates that the mass-driven mechanisms do not apply to the whole sample.