L. S. Aramyan, A. A. Hakobyan, A. R. Petrosian, L. V. Barkhudaryan, A. G. Karapetyan, V. Zh. Adibekyan, M. Turatto

Abstract
We present the results of the analysis of the impact of bars and spiral density waves on the relative frequencies of supernovae (SNe). We find that for early -type Grand-Design (GD) and non-Grand-Design (NGD) galaxies, the NIa/NCC ratios, i.e., one of the tracers of specific star formation rate (sSFR), are not significantly different between barred and unbarred hosts. At the same time, for both barred and unbarred early-type galaxies, the NIa /NCC ratio in NGD hosts is significantly higher than that in GD, and for late-type galaxies no any significant difference exists between the N Ia/NCC ratios. Thus, in contrast to bars, the spiral density waves significantly enhance the relative frequencies of SNe in early-type GD galaxies, while not in late-type hosts. This result is actual also for galaxies when barred and unbarred categories are separated. Hence, the sSFR might be enhanced by density waves in early-type galaxies only.

Non-Stable Universe: Energetic Resources, Activity Phenomena, and Evolutionary Processes
Haik A. Harutyunian Areg M. Mickaelian

Astronomical Society of the Pacific
Volume 511, Page 200
2017 July

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