The sub-galactic and nuclear main sequences for local star-forming galaxies

Abstract

We describe a sub-galactic main sequence (SGMS) relating star formation rate surface density (${\Sigma }_{\text{SFR}}$) and stellar mass density (${\Sigma }_{\star }$) for distinct regions within star forming galaxies, including their nuclei. We use a sample of 246 nearby star-forming galaxies from the "Star Formation Reference Survey" and demonstrate that the SGMS holds down to $\sim$1 kpc scales with a slope of $\alpha =0.91$ and a dispersion of 0.31 dex, similar to the well-known main sequence (MS) measured for globally integrated star formation rates (SFRs) and stellar masses. The SGMS slope depends on galaxy morphology, with late-type galaxies (Sc$-$Irr) having $\alpha =0.97$ and early-type spirals (Sa$-$Sbc) having $\alpha =0.81$. The SGMS constructed from sub-regions of individual galaxies has on average the same characteristics as the composite SGMS from all galaxies. The SGMS for galaxy nuclei shows a dispersion similar to that seen for other sub-regions. Sampling a limited range of SFR$-$M${}_{\star }$ space may produce either sub-linearity or super-linearity of the SGMS slope. For nearly all galaxies, both SFR and stellar mass peak in the nucleus, indicating that circumnuclear clusters are among the most actively star-forming regions in the galaxy and the most massive. The nuclear SFR also correlates with total galaxy mass, forming a distinct sequence from the standard MS of star-formation. The nuclear main sequence will be useful for studying bulge growth and for characterizing feedback processes connecting AGN and star formation.

Accepted for publication in MNRAS. 13 pages, 13 figures, 1 table

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