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(abridged) A fundamental subject in Extragalactic Astronomy concerns the formation and evolution of late-type galaxies (LTGs). The standard scenario comprises the early assembly of the bulge followed by disk accretion. However, recent observational evidence points to a joint formation and perpetual co-evolution of these structural components. Our current knowledge on the properties of bulge and disk is mostly founded on photometric decomposition studies, which sensitively depend on the adopted methodology and enclosed assumptions on the structure of LTGs. A critical assumption whose validity was never questioned is that galactic disks conserve their exponential nature up to the galactic center. This implies that bulge and disk co-exist without significant dynamical interaction and mass exchange over nearly the entire Hubble time. Our goal is to examine the validity of the standard assumption that galactic disks preserve their exponential intensity profile inside the bulge radius all the way to the galactic center. We developed a spectrophotometric bulge-disk decomposition technique that provides an estimation for the net spectrum of the bulge. A systematic application of our spectr

Author

Breda, Iris; Papaderos, Polychronis; Gomes, Jean Michel

Published

2020

Language

EN