e-MERLIN observations at 5 GHz of the GOODS-N region: pinpointing AGN cores in high redshift galaxies

Abstract

We present 5 GHz e-MERLIN observations of the GOODS-N region at sub-arcsec resolution (0.2--0.5 arcsec). These data form part of the early commissioning observations for the e-MERLIN interferometer and a pilot for the e-MERLIN legacy program eMERGE. A total of 17 sources were detected with S/N>3. These observations provide unique information on the radio source morphology at sub-arcsec scales. For twelve of these sources, deeper 1.4 GHz MERLIN+VLA observations at the same spatial resolution are available, allowing radio spectral indices to be derived for ten sources on sub-arcsec angular scales. Via analysis of the spectral indices and radio morphologies, these sources have been identified as AGN cores in moderate-to-high redshift (1<z<4) galaxies. These results have provided AGN (or AGN candidate) classification for six previously unclassified sources and confirmed the AGN nature of the rest of the sample. Ultimately the eMERGE project will image the GOODS-N region at 1.4 and 5 GHz with higher resolution (about 50 mas at 5 GHz) and down to sub-microJy sensitivities. The unique combination of sensitivity and spatial resolution will be exploited to study star formation and AGN activity in distant galaxies.

11 pages, 3 figures, accepted for publication in MNRAS

References in corpus (12)

• GOODS-Herschel: The far-infrared view of star formation in AGN host galaxies since z~3
• Radio imaging of the Subaru/XMM-Newton Deep Field - I. The 100-microJy catalogue, optical identifications, and the nature of the faint radio source population
• Weighing the Black Holes in z~2 Submillimeter-Emitting Galaxies Hosting Active Galactic Nuclei
• The Star Formation History of the Universe as Revealed by Deep Radio Observations
• A new method to separate star forming from AGN galaxies at intermediate redshift: The submillijansky radio population in the VLA-COSMOS survey
• High-resolution radio observations of submillimetre galaxies
• A catalogue of micro-Jy radio sources in northern legacy fields
• Deep, wide-field, global VLBI observations of the Hubble Deep Field North and Flanking Fields
• An evolution of the IR-Radio correlation at very low flux densities?
• The nuclear starburst in Arp 299-A: From the 5.0 GHz VLBI radio light-curves to its core-collapse supernova rate
• Using VO tools to investigate distant radio starbursts hosting obscured AGN in the HDF(N) region
• Rapid variability of the compact radio sources in Arp220. Evidence for a population of microblazars?

Cited by in corpus (8)

• Is There a Maximum Star Formation Rate in High-Redshift Galaxies?
• The distribution of polarized radio sources $>$15$\mu$Jy in GOODS-N
• The eMERGE Survey I: Very Large Array 5.5 GHz observations of the GOODS-North Field
• A Submillimeter Perspective on the GOODS Fields (SUPER GOODS) - II. The High Radio Power Population in the GOODS-N
• Optical and radio astrometry of the galaxy associated with FRB150418
• The optically-selected 1.4-GHz quasar luminosity function below 1 mJy
• The e-MERLIN Data Reduction Pipeline
• Constraints on the galaxy "main sequence" at z>5: the stellar mass of HDF850.1