The OTELO survey. III. Demography, morphology, IR luminosity and environment of AGN hosts

Abstract

We take advantage of the capabilities of the OTELO survey to select and study the AGN population in the field. We performed an analysis of the properties of these objects, including their demography, morphology, and IR luminosity. Focusing on the population of H$\alpha$ emitters at $z\sim 0.4$, we also aim to study the environments of AGN and non-AGN galaxies at that redshift. We make use of the multiwavelength catalog of objects in the field compiled by the OTELO survey, unique in terms of minimum line flux and equivalent width. The OTELO pseudo-spectra allow the identification of emission lines and the spectral classification of the sources. We obtained a sample of 72 AGNs in the field of OTELO, selected with four different methods in the optical, X-rays, and mid-infrared bands. We find that using X-rays is the most efficient way to select AGNs. An analysis was performed on the AGN population of OTELO in order to characterize its members. At $z\sim 0.4$, we find that up to 26\% of our H$\alpha$ emitters are AGNs. At that redshift, AGNs are found in identical environments to non-AGNs, although they represent the most clustered group when compared to passive and star-forming galaxies. The majority of our AGNs at any redshift were classified as late-type galaxies, including a 16\% proportion of irregulars. Another 16\% of AGNs show signs of interactions or mergers. Regarding the infrared luminosity, we are able to recover all the luminous infrared galaxies (LIRGs) in the field of OTELO up to $z\sim 1.6$. We find that the proportion of LIRGs and ultra-luminous infrared galaxies (ULIRGs) is higher among the AGN population, and that ULIRGs show a higher fraction of AGNs than LIRGs.

31 pages, 32 figures. Published in Astronomy \& Astrophysics

References in corpus (8)

• The Host Galaxies and Classification of Active Galactic Nuclei
• GALAPAGOS: From Pixels to Parameters
• The Chandra COSMOS-Legacy survey: Source X-ray spectral properties
• OTELO Survey: Deep BVRI broadband photometry of the Groth strip. II Properties of X-ray Emitters
• The OTELO survey. I. Description, data reduction, and multi-wavelength catalogue
• [Ultra] Luminous Infrared Galaxies selected at 90 $\mu$m in the AKARI deep field: a study of AGN types contributing to their infrared emission
• GLACE survey: OSIRIS/GTC Tuneable Filter H$\alpha$ imaging of the rich galaxy cluster ZwCl 0024.0+1652 at z = 0.395. Part I -- Survey presentation, TF data reduction techniques and catalogue
• The OTELO survey. II. The faint-end of the H$\alpha$ luminosity function at z $\sim$ 0.40

Cited by in corpus (5)

• A 16 deg${}^2$ survey of emission-line galaxies at z<1.6 from HSC-SSP PDR2 and CHORUS
• The OTELO survey. II. The faint-end of the H$\alpha$ luminosity function at z $\sim$ 0.40
• The OTELO survey: Revealing a population of low-luminosity current/active star-forming galaxies at z$\sim 0.9$
• GLACE survey: galaxy activity in ZwCl0024+1652 cluster from strong optical emission lines
• Effect of AGN on the morphological properties of their host galaxies in the local Universe