A panchromatic spatially-resolved analysis of nearby galaxies: sub-kpc scale Main Sequence in grand-design spirals. (arXiv:2001.04479v1 [astro-ph.GA])

A panchromatic spatially-resolved analysis of nearby galaxies: sub-kpc scale Main Sequence in grand-design spirals. (arXiv:2001.04479v1 [astro-ph.GA])
<a href="http://arxiv.org/find/astro-ph/1/au:+Enia_A/0/1/0/all/0/1">A. Enia</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Rodighiero_G/0/1/0/all/0/1">G. Rodighiero</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Morselli_L/0/1/0/all/0/1">L. Morselli</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Casasola_V/0/1/0/all/0/1">V. Casasola</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Bianchi_S/0/1/0/all/0/1">S. Bianchi</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Rodriguez_Munoz_L/0/1/0/all/0/1">L. Rodriguez-Munoz</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Mancini_C/0/1/0/all/0/1">C. Mancini</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Renzini_A/0/1/0/all/0/1">A. Renzini</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Popesso_P/0/1/0/all/0/1">P. Popesso</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Cassata_P/0/1/0/all/0/1">P. Cassata</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Negrello_M/0/1/0/all/0/1">M. Negrello</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Franceschini_A/0/1/0/all/0/1">A. Franceschini</a>

We analyse the spatially resolved relation between stellar mass (M$_{star}$)
and star formation rate (SFR) in disk galaxies (i.e. the Main Sequence, MS).
The studied sample includes eight nearby face-on grand-design spirals, e.g. the
descendant of high-redshift, rotationally-supported star-forming galaxies. We
exploit photometric information over 23 bands, from the UV to the far-IR, from
the publicly available DustPedia database to build spatially resolved maps of
stellar mass and star formation rates on sub-galactic scales of 0.5-1.5 kpc, by
performing a spectral energy distribution fitting procedure that accounts for
both the observed and the obscured star formation processes, over a wide range
of internal galaxy environments (bulges, spiral arms, outskirts). With more
than 30 thousands physical cells, we have derived a conservative definition of
the local spatially resolved MS per unit area for disks,
$log(Sigma_{SFR})$=0.82log$(Sigma_{*})$-8.69. This is consistent with the
bulk of recent results based on optical IFU, using the H$alpha$ line emission
as a SFR tracer. Our work extends the analysis at lower sensitivities in both
M$_{star}$ and SFR surface densities, up to a factor $sim$ 10. The self
consistency of the MS relation over different spatial scales, from sub-galactic
to galactic, as well as with a rescaled correlation obtained for high redshift
galaxies, clearly proves its universality.

We analyse the spatially resolved relation between stellar mass (M$_{star}$)
and star formation rate (SFR) in disk galaxies (i.e. the Main Sequence, MS).
The studied sample includes eight nearby face-on grand-design spirals, e.g. the
descendant of high-redshift, rotationally-supported star-forming galaxies. We
exploit photometric information over 23 bands, from the UV to the far-IR, from
the publicly available DustPedia database to build spatially resolved maps of
stellar mass and star formation rates on sub-galactic scales of 0.5-1.5 kpc, by
performing a spectral energy distribution fitting procedure that accounts for
both the observed and the obscured star formation processes, over a wide range
of internal galaxy environments (bulges, spiral arms, outskirts). With more
than 30 thousands physical cells, we have derived a conservative definition of
the local spatially resolved MS per unit area for disks,
$log(Sigma_{SFR})$=0.82log$(Sigma_{*})$-8.69. This is consistent with the
bulk of recent results based on optical IFU, using the H$alpha$ line emission
as a SFR tracer. Our work extends the analysis at lower sensitivities in both
M$_{star}$ and SFR surface densities, up to a factor $sim$ 10. The self
consistency of the MS relation over different spatial scales, from sub-galactic
to galactic, as well as with a rescaled correlation obtained for high redshift
galaxies, clearly proves its universality.

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