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(abridged) A fundamental subject in Extragalactic Astronomy concerns theformation and evolution of late-type galaxies (LTGs). The standard scenariocomprises the early assembly of the bulge followed by disk accretion. However,recent observational evidence points to a joint formation and perpetualco-evolution of these structural components. Our current knowledge on theproperties of bulge and disk is mostly founded on photometric decompositionstudies, which sensitively depend on the adopted methodology and enclosedassumptions on the structure of LTGs. A critical assumption whose validity wasnever questioned is that galactic disks conserve their exponential nature up tothe galactic center. This implies that bulge and disk co-exist withoutsignificant dynamical interaction and mass exchange over nearly the entireHubble time. Our goal is to examine the validity of the standard assumptionthat galactic disks preserve their exponential intensity profile inside thebulge radius all the way to the galactic center. We developed aspectrophotometric bulge-disk decomposition technique that provides anestimation for the net spectrum of the bulge. A systematic application of ourspectrophotometric bulge-disk decomposition tool to a representative sample of135 local LTGs from the CALIFA Survey yields a significant fraction (up to~30%) of unphysical net-bulge spectra when a purely exponential intensityprofile is assumed for the disk. The obtained results suggest that, for asignificant fraction of LTGs, the disk component shows a down-bending beneaththe bulge. If proven to be true, such result will call for a substantialrevision of structural decomposition studies for LTGs and have far-reachingimplications in our understanding of the photometric properties of theirbulges.

Indications of the invalidity of the exponentiality of the disk within bulges of spiral galaxies