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

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Ramón-Pérez, Marina and Bongiovanni, Ángel and Pérez García, Ana María and Cepa, Jordi and Nadolny, Jakup and Pintos-Castro, Irene and Lara-López, Maritza A. and Alfaro, Emilio J. and Castañeda, Héctor O. and Cerviño, Miguel and Diego, José A. and Fernández-Lorenzo, Mirian and Gallego Maestro, Jesús and González, J. Jesús and González-Serrano, J. Ignacio and Oteo Gómez, Iván and Pérez Martínez, Ricardo and Povic, Mirjana and Sánchez-Portal, Miguel (2019) The OTELO survey II. The faint-end of the Hα luminosity function at z ∼ 0.40. Astronomy & Astrophysics, 631 . ISSN 0004-6361

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Official URL: http://dx.doi.org/10.1051/0004-6361/201833295




Abstract

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.
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 Hα luminosity function at z ∼ 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 ∼0.002 Mꙩ yr^(−1) ). The AGN contribution to the total Hα luminosity is estimated. We find that no AGN should be expected below a luminosity of log10 L = 38.6 erg s^(−1) . From the sample of non-AGN (presumably, pure SFG) at z ∼ 0.40 we estimated a star formation rate density of ρ_(SFR) = 0.012 ± 0.005 Mꙩ yr^(−1) Mpc^(−3).


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© ESO 2019. This work was supported by the Spanish Ministry of Economy and Competitiveness (MINECO) under the grants AYA2013 - 46724 - P, AYA2014 - 58861 - C3 - 1 - P, AYA2014 - 58861 - C3 - 2 - P, AYA2014 - 58861 - C3 - 3 - P, AYA2016 - 75808 - R, AYA2016 - 75931 - C2 - 2 - P, AYA2017 - 88007 - C3 - 1 - P, and AYA2017 - 88007 - C3 - 2 - P. Based on observations made with the Gran Telescopio Canarias installed in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofísica de Canarias, in the island of La Palma. The authors thanks the anonymous referee for her/his feedback and suggestions.

Uncontrolled Keywords:Star-formation rate; Cosmic vaiance; Line galaxies; Stellar-mass; Evolution; Hizels; Emitters; AGN; Redshifts; Z=2.23
Subjects:Sciences > Physics > Astrophysics
Sciences > Physics > Astronomy
ID Code:63915
Deposited On:16 Feb 2021 10:30
Last Modified:16 Feb 2021 11:09

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