A 1.4 deg2 blind survey for C II], C III] and C IV at z ∼ 0.7–1.5 – I. Nature, morphologies and equivalent widths

2017/03/31 by Andra Stroe, David Sobral, Jorryt Matthee +3 · 1 citation
Biochemistry, Genetics and Molecular Biology · Physics and Astronomy · #Advanced Fluorescence Microscopy Techniques #Astronomy #Astrophysics #Galaxies: Formation, Evolution, Phenomena #Physics #Stellar, planetary, and galactic studies #astro-ph.CO #astro-ph.GA

paper · pdf · doi:10.1093/mnras/stx1712

Accepted for publication to MNRAS. Comments welcome! 17 pages, 12 figures, 8 tables. Paper II can be found here: https://arxiv.org/abs/1704.01124

openalex publication_date 2017/07/09 · arxiv created 2017/07/12 · openalex created_date 2017/08/08 · arxiv updated 2017/08/16 · openalex updated_date 2026/08/05

Abstract

While traditionally associated with active galactic nuclei (AGN), the properties of the CII], CIII] and CIV emission lines are still uncertain as large, unbiased samples of sources are scarce. We present the first blind, statistical study of CII], CIII] and CIV emitters at z∼0.68,1.05,1.53, respectively, uniformly selected down to a flux limit of ∼4×10^-17 erg s^-1 cm^-1 through a narrow band survey covering an area of ∼1.4 deg² over COSMOS and UDS. We detect 16 CII], 35 CIII] and 17 CIV emitters, whose nature we investigate using optical colours as well as HST, X-ray, radio and far infra-red data. We find that z∼0.7 CII] emitters are consistent with a mixture of blue (UV slope β=-2.0±0.4) star forming galaxies with disky HST structure and AGN with Seyfert-like morphologies. Bright CII] emitters have individual X-ray detections as well as high average black hole accretion rates (BHAR) of ∼0.1 M_\odot yr^-1. CIII] emitters at z∼1.05 trace a general population of SF galaxies, with β=-0.8±1.1, a variety of optical morphologies, including isolated and interacting galaxies and low BHAR (

Citations

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• A \bf 1.4 deg\bf ² blind survey for CII], CIII] and CIV at \bf z∼0.7-1.5. II: luminosity functions and cosmic average line ratios