# The OTELO survey. II. The faint-end of the Hα luminosity function at z ̃ 0.40

DOI:
10.1051/0004-6361/201833295
Publication date:
01/11/2019
Main author:
Ramón-Pérez, Marina
IAA authors:
Alfaro, Emilio;Cerviño, Miguel;Fernández-Lorenzo, Mirian;Pović, Mirjana
Authors:
Ramón-Pérez, Marina;Bongiovanni, Ángel;Pérez García, Ana María;Cepa, Jordi;Lara-López, Maritza A.;de Diego, José A.;Alfaro, Emilio;Castañeda, Héctor O.;Cerviño, Miguel;Fernández-Lorenzo, Mirian;Gallego, Jesús;González, J. Jesús;González-Serrano, J. Ignacio;Nadolny, Jakub;Oteo Gómez, Iván;Pérez Martínez, Ricardo;Pintos-Castro, Irene;Pović, Mirjana;Sánchez-Portal, Miguel
Journal:
Astronomy and Astrophysics
Refereed:
Yes
Publication type:
Article
Volume:
631
Pages:
A10
Abstract:
<BR /> Aims: We take advantage of the capability of the OTELO survey to obtain the Hα luminosity function (LF) at z ̃ 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. <BR /> 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. <BR /> Results: The Hα luminosity function at z ̃ 0.40 is obtained, which extends the current faint end by almost 1 dex, reaching minimal luminosities of log<SUB>10</SUB>L<SUB>lim</SUB> = 38.5 erg s<SUP>-1</SUP> (or ̃0.002 M<SUB>☉</SUB> yr<SUP>-1</SUP>). The AGN contribution to the total Hα luminosity is estimated. We find that no AGN should be expected below a luminosity of log<SUB>10</SUB>L = 38.6 erg s<SUP>-1</SUP>. From the sample of non-AGN (presumably, pure SFG) at z ̃ 0.40 we estimated a star formation rate density of ρ<SUB>SFR</SUB> = 0.012 ± 0.005 M<SUB>☉</SUB> yr<SUP>-1</SUP> Mpc<SUP>-3</SUP>.
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