The OTELO survey. Nature and mass-metallicity relation for Hα emitters at z ∼ 0.4

Autor: Mirjana Pović, Jesús Gallego, Emilio J. Alfaro, Jakub Nadolny, Ángel Bongiovanni, Maritza A. Lara-López, Jordi Cepa, Irene Pintos-Castro, J. Jesús González, José A. de Diego, Miguel Sánchez-Portal, J. Ignacio González-Serrano, Héctor O. Castañeda, Ana María Pérez García, Miguel Cerviño, Ricardo Pérez Martínez, Carmen P. Padilla Torres
Přispěvatelé: Ministerio de Economía y Competitividad (España), European Commission, Universidad Nacional Autónoma de México, Agencia Estatal de Investigación (España), Unidad de Excelencia Científica María de Maeztu Centro de Astrobiología del Instituto Nacional de Técnica Aeroespacial y CSIC, MDM-2017-0737, Ministerio de Economía y Competitividad (MINECO), Universidad Nacional Autónoma de México (UNAM), Agencia Estatal de Investigación (AEI), Pérez García, A. M. https://orcid.org/0000-0003-1634-3588, Pérez Martínez, R. https://orcid.org/0000-0002-9127-5522, European Commission (EC), Universidad de Cantabria
Rok vydání: 2020
Předmět:
Zdroj: Digital.CSIC. Repositorio Institucional del CSIC
instname
DIGITAL.INTA Repositorio Digital del Instituto Nacional de Técnica Aeroespacial
Instituto Nacional de Técnica Aeroespacial (INTA)
Astronomy & Astrophysics. 2020, 636, A84
UCrea Repositorio Abierto de la Universidad de Cantabria
Universidad de Cantabria (UC)
Popis: [Contex]: 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.
This work was supported by the project Evolution of Galaxies, of reference AYA2014-58861-C3-1-P, AYA2017-88007-C3-1-P and AYA2017-88007-C3-2-P, within the "Programa estatal de fomento de la investigacion cientifica y tecnica de excelencia del Plan Estatal de Investigacion Cientifica y Tecnica y de Innovacion (2013-2016)" of the "Agencia Estatal de Investigacion del Ministerio de Ciencia, Innovacion y Universidades", and co-financed by the FEDER "Fondo Europeo de Desarrollo Regional". APG and MC are also supported by the Spanish State Research Agency grant MDM-20170737 (Unidad de Excelencia Maria de Maeztu CAB). JAD is grateful for the support from the UNAM-DGAPA-PASPA 2019 program, and the kind hospitality of the IAC. Based on observations made with the Gran Telescopio Canarias (GTC), installed in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofisica de Canarias, on the island of La Palma. MALL is a DARK-Carlsberg Foundation Fellow (Semper Ardens project CF15-0384). This research uses data from the VIMOS VLT Deep Survey, obtained from the VVDS database operated by Cesam, Laboratoire d'Astrophysique de Marseille, France. Based on observations obtained with MegaPrime/MegaCam, a joint project of CFHT and CEA/IRFU, at the Canada-France-Hawaii Telescope (CFHT) which is operated by the National Research Council (NRC) of Canada, the Institut National des Science de l'Univers of the Centre National de la Recherche Scientifique (CNRS) of France, and the University of Hawaii. This work is based in part on data products produced at Terapix available at the Canadian Astronomy Data Centre as part of the Canada-France-Hawaii Telescope Legacy Survey, a collaborative project of NRC and CNRS. This work had made extensive use of TOPCAT and STILTS software (Taylor 2005).
Databáze: OpenAIRE
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