Properties of 185 SNe Ia and their 180 hosts

To accomplish this, we present a simple visual classification approach based on the UV/H {alpha} images of the discs of host galaxies. We demonstrate that, from the perspective of the dynamical time-scale of the SFD, where the star formation is suppressed by the bar evolution, the {Delta}m_15_ of SN Ia and progenitor age can be related.

The SFD phenomenon gives an excellent possibility to separate a subpopulation of SN Ia progenitors with ages older than a few Gyr. We show, for the first time, that the SFDs contain mostly faster declining SNe Ia ({Delta}m_15_>1.25). For the galaxies without SFDs, the region within the bar radius, and outer disc contain mostly slower declining SNe Ia.