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The OTELO survey

Other TitlesII. The faint-end of the Hα luminosity function at z ∼ 0.40
AuthorsRamón-Pérez, Marina; Bongiovanni, Ángel; Pérez-García, Ana M.; Cepa, Jordi; Lara-López, Maritza A.; Diego, J. A. de; Alfaro, Emilio J. CSIC ORCID ; Castañeda, Héctor; Cerviño, Miguel CSIC ORCID CVN ; Fernández Lorenzo, M. CSIC; Gallego, Jesús; González, José Jesús; González-Serrano, José Ignacio CSIC ORCID ; Nadolny, Jakub; Oteo Gómez, Iván; Pérez-Martínez, Ricardo; Pintos-Castro, Irene; Pović, Mirjana; Sánchez-Portal, Miguel
KeywordsGalaxies: active
Galaxies: luminosity function, mass function
Galaxies: star formation
Issue Date2019
PublisherEDP Sciences
CitationAstronomy and Astrophysics 631: A10 (2019)
Abstract[Aims] We take advantage of the capability of the OTELO survey to obtain the H alpha luminosity function (LF) at z similar to 0.40. Because of the deepest coverage of OTELO, we are able to determine the faint end of the LF, and thus better constrain the star formation rate and the number of galaxies at low luminosities. The AGN contribution to this LF is estimated as well. [Methods] We make use of the multiwavelength catalogue of objects in the field compiled by the OTELO survey, which is unique in terms of minimum flux and equivalent width. We also take advantage of the pseudo-spectra built for each source, which allow the identification of emission lines and the discrimination of different types of objects. [Results] The H alpha luminosity function at z similar to 0.40 is obtained, which extends the current faint end by almost 1 dex, reaching minimal luminosities of log(10) L-lim = 38.5 erg s(-1) (or similar to 0.002 M-circle dot yr(-1)). The AGN contribution to the total H alpha luminosity is estimated. We find that no AGN should be expected below a luminosity of log(10) L = 38.6 erg s(-1). From the sample of non-AGN (presumably, pure SFG) at z similar to 0.40 we estimated a star formation rate density of rho(SFR) = 0.012 +/- 0.005 M-circle dot yr(-1) Mpc(-3).
Publisher version (URL)http://dx.doi.org/10.1051/0004-6361/201833295
Identifiersdoi: 10.1051/0004-6361/201833295
issn: 1432-0746
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