The Main Sequence at z ∼ 1.3 Contains a Sizable Fraction of Galaxies with 
Compact Star Formation Sizes: A New Population of Early Post-starbursts?

Puglisi, A.; Daddi, E.; Liu, D.; Bournaud, F.; Silverman, J. D.; Circosta, C.; Calabrò, A.; Aravena, M.; Cibinel, A.; Dannerbauer, H.; Delvecchio, I.; Elbaz, D.; Gao, Y.; Gobat, R.; Jin, S.; Le Floc'h, E.; Magdis, G. E.; Mancini, C.; Riechers, D. A.; Rodighiero, G.; Sargent, M.; Valentino, F.; Zanisi, L.

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Journal Article

The Main Sequence at z ∼ 1.3 Contains a Sizable Fraction of Galaxies with Compact Star Formation Sizes: A New Population of Early Post-starbursts?

MPS-Authors

Puglisi, A.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Daddi, E.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Liu, D.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Bournaud, F.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Silverman, J. D.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Circosta, C.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Calabrò, A.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Aravena, M.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Cibinel, A.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Dannerbauer, H.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Delvecchio, I.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Elbaz, D.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Gao, Y.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Gobat, R.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Jin, S.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Le Floc'h, E.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Magdis, G. E.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Mancini, C.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Riechers, D. A.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Rodighiero, G.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Sargent, M.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Valentino, F.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Zanisi, L.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

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https://ui.adsabs.harvard.edu/abs/2019ApJ...877L..23P
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Citation

Puglisi, A., Daddi, E., Liu, D., Bournaud, F., Silverman, J. D., Circosta, C., et al. (2019). The Main Sequence at z ∼ 1.3 Contains a Sizable Fraction of Galaxies with Compact Star Formation Sizes: A New Population of Early Post-starbursts? The Astrophysical Journal, 877.

Cite as: https://hdl.handle.net/21.11116/0000-0005-CFF8-B

Abstract

Atacama Large Millimeter/submillimeter Array (ALMA) measurements for 93 Herschel-selected galaxies at 1.1 ≤ z ≤ 1.7 in COSMOS reveal a sizable (>29%) population with compact star formation (SF) sizes, lying on average >×3.6 below the optical stellar mass (M _⋆)─size relation of disks. This sample widely spans the star-forming main sequence (MS), having 10⁸ ≤ M _⋆ ≤ 10^11.5 M _☉ and 20 ≤ star formation rate (SFR) ≤ 680 M _☉ yr⁻¹. The 32 size measurements and 61 upper limits are measured on ALMA images that combine observations of CO(5─4), CO(4─3), CO(2─1), and λ _obs ∼ 1.1─1.3 mm continuum, all tracing the star-forming molecular gas. These compact galaxies have instead normally extended K _band sizes, suggesting strong specific SFR gradients. Compact galaxies comprise the 50 ± 18% of MS galaxies at M _⋆ > 10¹¹ M _☉. This is not expected in standard bimodal scenarios, where MS galaxies are mostly steadily growing extended disks. We suggest that compact MS objects are early post-starburst galaxies in which the merger-driven boost of SF has subsided. They retain their compact SF size until either further gas accretion restores premerger galaxy-wide SF, or until becoming quenched. The fraction of merger-affected SF inside the MS seems thus larger than anticipated and might reach ∼50% at the highest M _⋆. The presence of large galaxies above the MS demonstrates an overall poor correlation between galaxy SF size and specific SFR.