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Radio continuum size evolution of star-forming galaxies over 0.35 < z < 2.25 (CROSBI ID 280081)

Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija

Jiménez-Andrade, E. F. ; Magnelli, B. ; Karim, A. ; Zamorani, G. ; Bondi, M. ; Schinnerer, E. ; Sargent, M. ; Romano-Díaz, E. ; Novak, Mladen ; Lang, P. et al. Radio continuum size evolution of star-forming galaxies over 0.35 < z < 2.25 // Astronomy & astrophysics, 625 (2019), A114, 20. doi: 10.1051/0004-6361/201935178

Podaci o odgovornosti

Jiménez-Andrade, E. F. ; Magnelli, B. ; Karim, A. ; Zamorani, G. ; Bondi, M. ; Schinnerer, E. ; Sargent, M. ; Romano-Díaz, E. ; Novak, Mladen ; Lang, P. ; Bertoldi, F. ; Vardoulaki, E. ; Toft, S. ; Smolčić, Vernesa ; Harrington, K. ; Leslie, S. ; Delhaize, J. ; Liu, D. ; Karoumpis, C. ; Kartaltepe, J. Koekemoer, A. M.

engleski

Radio continuum size evolution of star-forming galaxies over 0.35 < z < 2.25

To better constrain the physical mechanisms driving star formation, we present the first systematic study of the radio continuum size evolution of star-forming galaxies (SFGs) over the redshift range 0.35 < z < 2.25. We use the VLA COSMOS 3 GHz map (noise rms = 2.3 μJy beam- 1, θbeam = 0.75 arcsec) to construct a mass- complete sample of 3184 radio-selected SFGs that reside on and above the main sequence (MS) of SFGs. We constrain the overall extent of star formation activity in galaxies by applying a 2D Gaussian model to their radio continuum emission. Extensive Monte Carlo simulations are used to validate the robustness of our measurements and characterize the selection function. We find no clear dependence between the radio size and stellar mass, M⋆, of SFGs with 10.5 ≲ log(M⋆/M☉) ≲ 11.5. Our analysis suggests that MS galaxies are preferentially extended, while SFGs above the MS are always compact. The median effective radius of SFGs on (above) the MS of Reff = 1.5 ± 0.2 (1.0 ± 0.2) kpc remains nearly constant with cosmic time ; a parametrization of the form Reff ∝ (1 + z)α yields a shallow slope of only α = -0.26 ± 0.08 (0.12 ± 0.14) for SFGs on (above) the MS. The size of the stellar component of galaxies is larger than the extent of the radio continuum emission by a factor ∼2 (1.3) at z = 0.5 (2), indicating star formation is enhanced at small radii. The galactic-averaged star formation rate surface density (ΣSFR) scales with the distance to the MS, except for a fraction of MS galaxies (≲10%) that harbor starburst-like ΣSFR. These "hidden" starbursts might have experienced a compaction phase due to disk instability and/or a merger-driven burst of star formation, which may or may not significantly offset a galaxy from the MS. We thus propose to use ΣSFR and distance to the MS in conjunction to better identify the galaxy population undergoing a starbursting phase.

galaxies: evolution ; galaxies: high-redshift ; galaxies: structure ; galaxies: starburst ; radio continuum: galaxies

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Podaci o izdanju

625

2019.

A114

20

objavljeno

0004-6361

1432-0746

10.1051/0004-6361/201935178

Povezanost rada

Fizika

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