TY - JOUR

T1 - The OTELO survey Nature and mass-metallicity relation for H alpha emitters at z similar to 0.4

AU - Nadolny, Jakub

AU - Lara-Lopez, Maritza A.

AU - Cervino, Miguel

AU - Bongiovanni, Angel

AU - Cepa, Jordi

AU - de Diego, Jose A.

AU - Perez Garcia, Ana Maria

AU - Perez Martinez, Ricardo

AU - Sanchez-Portal, Miguel

AU - Alfaro, Emilio

AU - Castaneda, Hector O.

AU - Gallego, Jesus

AU - Jesus Gonzalez, J.

AU - Ignacio Gonzalez-Serrano, J.

AU - Padilla Torres, Carmen P.

AU - Pintos-Castro, Irene

AU - Povic, Mirjana

PY - 2020/4/24

Y1 - 2020/4/24

N2 - Context. The OSIRIS Tunable Filter Emission Line Object (OTELO) survey is a very deep, blind exploration of a selected region of the Extended Groth Strip and is designed for finding emission-line sources (ELSs). The survey design, observations, data reduction, astrometry, and photometry, as well as the correlation with ancillary data used to obtain a final catalogue, including photo-z estimates and a preliminary selection of ELS, were described in a previous contribution.Aims. Here, we aim to determine the main properties and luminosity function (LF) of the [O III] ELS sample of OTELO as a scientific demonstration of its capabilities, advantages, and complementarity with respect to other surveys.Methods. The selection and analysis procedures of ELS candidates obtained using tunable filter pseudo-spectra are described. We performed simulations in the parameter space of the survey to obtain emission-line detection probabilities. Relevant characteristics of [O III] emitters and the LF ([O III]), including the main selection biases and uncertainties, are presented.Results. From 541 preliminary emission-line source candidates selected around z & x2004;=& x2004;0.8, a total of 184 sources were confirmed as [O III] emitters. Consistent with simulations, the minimum detectable line flux and equivalent width in this ELS sample are similar to 5 x 10(-19) erg s(-1) cm(2) and similar to 6 angstrom, respectively. We are able to constrain the faint-end slope (alpha & x2004;=& x2004;-1.03 +/- 0.08) of the observed LF ([O III]) at a mean redshift of z & x2004;=& x2004;0.83. This LF reaches values that are approximately ten times lower than those from other surveys. The vast majority (84%) of the morphologically classified [O III] ELSs are disc-like sources, and 87% of this sample is comprised of galaxies with stellar masses of M-& x22c6;& x2004;<& x2004;10(10) M-circle dot.

AB - Context. The OSIRIS Tunable Filter Emission Line Object (OTELO) survey is a very deep, blind exploration of a selected region of the Extended Groth Strip and is designed for finding emission-line sources (ELSs). The survey design, observations, data reduction, astrometry, and photometry, as well as the correlation with ancillary data used to obtain a final catalogue, including photo-z estimates and a preliminary selection of ELS, were described in a previous contribution.Aims. Here, we aim to determine the main properties and luminosity function (LF) of the [O III] ELS sample of OTELO as a scientific demonstration of its capabilities, advantages, and complementarity with respect to other surveys.Methods. The selection and analysis procedures of ELS candidates obtained using tunable filter pseudo-spectra are described. We performed simulations in the parameter space of the survey to obtain emission-line detection probabilities. Relevant characteristics of [O III] emitters and the LF ([O III]), including the main selection biases and uncertainties, are presented.Results. From 541 preliminary emission-line source candidates selected around z & x2004;=& x2004;0.8, a total of 184 sources were confirmed as [O III] emitters. Consistent with simulations, the minimum detectable line flux and equivalent width in this ELS sample are similar to 5 x 10(-19) erg s(-1) cm(2) and similar to 6 angstrom, respectively. We are able to constrain the faint-end slope (alpha & x2004;=& x2004;-1.03 +/- 0.08) of the observed LF ([O III]) at a mean redshift of z & x2004;=& x2004;0.83. This LF reaches values that are approximately ten times lower than those from other surveys. The vast majority (84%) of the morphologically classified [O III] ELSs are disc-like sources, and 87% of this sample is comprised of galaxies with stellar masses of M-& x22c6;& x2004;<& x2004;10(10) M-circle dot.

KW - techniques

KW - imaging spectroscopy

KW - surveys

KW - catalogs

KW - galaxies

KW - starburst

KW - active

KW - luminosity function

KW - mass function

KW - STAR-FORMING GALAXIES

KW - ASSEMBLY GAMA

KW - PHOTOMETRIC REDSHIFTS

KW - LINE GALAXIES

KW - DATA RELEASE

KW - DEEP-FIELD

KW - EVOLUTION

KW - EMISSION

KW - DECOMPOSITION

KW - POPULATION

U2 - 10.1051/0004-6361/201936205

DO - 10.1051/0004-6361/201936205

M3 - Journal article

VL - 636

JO - Astronomy & Astrophysics

JF - Astronomy & Astrophysics

SN - 0004-6361

M1 - A84

ER -