Linear radio size evolution of μJy populations

Bondi, M.; Zamorani, G.; Ciliegi, P.; Smolčić, V.; Schinnerer, E.; Delvecchio, I.; Jiménez-Andrade, E. F.; Liu, D.; Lang, P.; Magnelli, B.; Murphy, E. J.; Vardoulaki, E.

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Journal Article

Linear radio size evolution of μJy populations

MPS-Authors

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

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

Ciliegi, P.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Smolčić, V.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

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

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

Jiménez-Andrade, E. F.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

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

Lang, P.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Magnelli, B.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

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

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

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https://ui.adsabs.harvard.edu/abs/2018A&A...618L...8B
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Citation

Bondi, M., Zamorani, G., Ciliegi, P., Smolčić, V., Schinnerer, E., Delvecchio, I., et al. (2018). Linear radio size evolution of μJy populations. Astronomy and Astrophysics, 618.

Cite as: https://hdl.handle.net/21.11116/0000-0005-CEC6-4

Abstract

We investigate the linear radio size properties of the μJy populations of radio-selected active galactic nuclei (AGN) and star-forming galaxies (SFGs) using a multi-resolution catalog based on the original VLA-COSMOS 3 GHz 0.″75 resolution mosaic and its convolved images (up to a resolution of 2.″2). The final catalog contains 6399 radio sources above a 3 GHz total flux density of S_T > 20 μJy (median ⟨S_T⟩=37 μJy), with redshift information (median ⟨z⟩=1.0), and multi-wavelength classification as SFGs, radio-excess AGN (RX-AGN), or non-radio-excess AGN (NRX-AGN). RX-AGN are those whose radio emission exceeds the star formation rate derived by fitting the global spectral energy distribution. We derive the evolution with redshift and luminosity of the median linear sizes of each class of objects. We find that RX-AGN are compact, with median sizes of ̃1-2 kpc and increasing with redshift, corresponding to an almost constant angular size of 0.″25. NRX-AGN typically have radio sizes a factor of 2 larger than the