The PDS vs. Markarian starburst galaxies: comparing strong and weak IRAS emitter at 12$\mu$m and 25$\mu$m in the nearby universe

Abstract

(Abridged) The characteristics of the starburst galaxies from the Pico dos Dias survey (PDS) are compared with those of the nearby UV-bright Markarian starburst galaxies, having the same limit in redshift ($v_h<7500$ km s${}^{-1}$) and absolute $B$ magnitude ($M_B<-18$). An important difference is found: the Markarian galaxies are generally undetected at 12$\mu$m and 25$\mu$m in \textit{IRAS}. This is consistent with the UV excess shown by these galaxies and suggests that the youngest star forming regions dominating these galaxies are relatively free of dust. The FIR selection criteria for the PDS is shown to introduce a strong bias towards massive (luminous) and large size late-type spiral galaxies. This is contrary to the Markarian galaxies, which are found to be remarkably rich in smaller size early-type galaxies. These results suggest that only late-type spirals with a large and massive disk are strong emitter at 12$\mu$m and 25$\mu$m in \textit{IRAS} in the nearby universe.

Accepted for publication in MNRAS

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