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• 1703.10169v1

Rights statement: This is a pre-copy-editing, author-produced PDF of an article accepted for publication in Monthly Notices of the Royal Astronomical Society following peer review. The definitive publisher-authenticated version Andra Stroe, David Sobral, Jorryt Matthee, João Calhau, Ivan Oteo; 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, Monthly Notices of the Royal Astronomical Society, Volume 471, Issue 3, 1 November 2017, Pages 2558–2574, https://doi.org/10.1093/mnras/stx1712 is available online at: https://academic.oup.com/mnras/article/471/3/2558/3950255/A-14-deg2-blind-survey-for-C-II-C-III-and-C-IV-at

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## A 1.4 deg^2 blind survey for CII], CIII] and CIV at z~0.7-1.5. I: Nature, morphologies and equivalent widths

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Journal publication date 1/11/2017 Monthly Notices of the Royal Astronomical Society 3 471 17 2558-2574 Published 10/07/17 English

### 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 $z\sim0.68,1.05,1.53$, respectively, uniformly selected down to a flux limit of $\sim4\times10^{-17}$ erg s$^{-1}$ cm$^{-1}$ through a narrow band survey covering an area of $\sim1.4$ deg$^2$ 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 $z\sim0.7$ CII] emitters are consistent with a mixture of blue (UV slope $\beta=-2.0\pm0.4$) 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 $\sim0.1$ $M_{\odot}$ yr$^{-1}$. CIII] emitters at $z\sim1.05$ trace a general population of SF galaxies, with $\beta=-0.8\pm1.1$, a variety of optical morphologies, including isolated and interacting galaxies and low BHAR (\$

### Bibliographic note

This is a pre-copy-editing, author-produced PDF of an article accepted for publication in Monthly Notices of the Royal Astronomical Society following peer review. The definitive publisher-authenticated version Andra Stroe, David Sobral, Jorryt Matthee, João Calhau, Ivan Oteo; 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, Monthly Notices of the Royal Astronomical Society, Volume 471, Issue 3, 1 November 2017, Pages 2558–2574, https://doi.org/10.1093/mnras/stx1712 is available online at: https://academic.oup.com/mnras/article/471/3/2558/3950255/A-14-deg2-blind-survey-for-C-II-C-III-and-C-IV-at