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The build-up of the outskirts of distant star-forming galaxies at z ~ 2

  • Sandro Tacchella (a1), C. Marcella Carollo (a1), Avishai Dekel (a2), Natascha Förster Schreiber (a3), Alvio Renzini (a4) and zC-SINF Team...

Abstract

In order to constrain – and understand – the growth of galaxies, we present a sample of ~ 30 galaxies at z ~ 2 with resolved distribution of stellar mass, star-formation rate, and dust attenuation on scales of ~ 1 kpc. We find that low- and intermediate-mass galaxies grow self-similarly, doubling their stellar mass in the centers and outskirts with the same pace. More massive galaxies (~ 1011 M) have a reduced star-formation activity in their center: they grow mostly in the outskirts (inside-out quenching / formation). Similar trends are find in cosmological zoom-in simulations, highlighting that high stellar mass densities are formed in a gas-rich compaction phase. This nuclear ‘starburst’ phase is followed by a suppressed star-formation activity in the center, resulting in growth of the outskirts. All in all, we put forward that we witness at z ~ 2 the dissipative formation of z = 0 M* early-type galaxies.

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References

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The build-up of the outskirts of distant star-forming galaxies at z ~ 2

  • Sandro Tacchella (a1), C. Marcella Carollo (a1), Avishai Dekel (a2), Natascha Förster Schreiber (a3), Alvio Renzini (a4) and zC-SINF Team...

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