Universität zu Köln

Bondi, M., Zamorani, G., Ciliegi, P., Smolcic, V, Schinnerer, E., Delvecchio, I, Jimenez-Andrade, E. F., Liu, D., Lang, P., Magnelli, B., Murphy, E. J. and Vardoulaki, E. (2018). Linear radio size evolution of mu Jy populations. Astron. Astrophys., 618. LES ULIS CEDEX A: EDP SCIENCES S A. ISSN 1432-0746

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Abstract

We investigate the linear radio size properties of the mu Jy 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 mu Jy (median < S-T >= 37 mu Jy), 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 similar to 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 RX-AGN. The median radio size of SFGs is about 5 kpc up to z similar to 0.7, and it decreases beyond this redshift. Using luminosity-complete subsamples of objects, we separately investigate the effect of redshift and luminosity dependance. We compare the radio sizes of SFGs with those derived in the rest-frame far-infrared (FIR) and UV bands. We find that SFGs have comparable sizes (within 15%) in the radio and rest-frame FIR, while the sizes measured in the UV-band are systematically larger than the radio sizes.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Bondi, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Zamorani, G. UNSPECIFIED UNSPECIFIED UNSPECIFIED Ciliegi, P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Smolcic, V UNSPECIFIED UNSPECIFIED UNSPECIFIED Schinnerer, E. UNSPECIFIED UNSPECIFIED UNSPECIFIED Delvecchio, I UNSPECIFIED UNSPECIFIED UNSPECIFIED Jimenez-Andrade, E. F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Liu, D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Lang, P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Magnelli, B. UNSPECIFIED UNSPECIFIED UNSPECIFIED Murphy, E. J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Vardoulaki, E. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-169041
DOI:	10.1051/0004-6361/201834243
Journal or Publication Title:	Astron. Astrophys.
Volume:	618
Date:	2018
Publisher:	EDP SCIENCES S A
Place of Publication:	LES ULIS CEDEX A
ISSN:	1432-0746
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language EARLY-TYPE GALAXIES; ULTRA-DEEP FIELD; STAR-FORMATION; STATISTICAL-METHODS; ASTRONOMICAL DATA; UPPER LIMITS; MORPHOLOGIES; EMISSION; CATALOG; NUCLEI Multiple languages Astronomy & Astrophysics Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/16904