The OTELO survey: the star formation rate evolution of low-mass galaxies

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Bernabé, Cedrés
Pérez García, Ana María
Pérez Martínez, Ricardo
Cerviño, Miguel
Bongiovanni, Ángel
Cepa, Jordi
Navarro Martínez, Rocío
Nadolny, Jakub
Lara López, Maritza A.
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We present the analysis of a sample of Hα, H β, and [O II]emission line galaxies from the OTELO survey, with masses typically below log(M*/Mꙩ) ∼ 9.4 and redshifts between z ∼ 0.4 and 1.43. We study the star formation rate, star formation rate density, and their number density and evolution with redshift. We obtain a robust estimate of the specific star formation rate—stellar mass relation based on the lowest-mass sample published so far. We also determine a flat trend of the star formation rate density (SFRD)and number density with redshift. Our results suggest a scenario of no evolution of the number density of galaxies, regardless of their masses, up to redshift z ∼1.4. This implies a gradual change of the relative importance of the star-forming processes, from high-mass galaxies to low- mass galaxies, with decreasing redshift. We also find little or no variation of the SFRD in the redshift range of 0.4 < z < 1.43.
© 2021. The American Astronomical Society. The authors thank the anonymous referee for their feedback and constructive suggestions, which have contributed to significantly improve the manuscript. This work was supported by the Spanish Ministry of Economy and Competitiveness (MINECO)under the grants AYA2014 - 58861 - C3 - 1 - P, AYA2014 - 58861 - C3 - 2 - P, AYA2014 - 58861 - C3 - 3 - P, AYA2013 - 46724 - P, AYA2017 - 88007 - C3 - 1 - P, AYA2017 - 88007 - C3 - 2, MDM - 2017 - 0737 (Unidad de Excelencia María de Maeztu, CAB). A.P.G. acknowledge support from ESA through the Faculty of the European Space Astronomy Centre (ESAC)—Funding reference ESAC_549/ 2019. B.C. wishes to thank Carlota Leal Álvarez by her support during the development of this paper. E.J.A. acknowledges funding from the State Agency for Research of the Spanish MCIU through the “Center of Excellence Severo Ochoa” award to the Instituto de Astrofísica de Andalucía (SEV-2017-0709)and from grant PGC2018-095049-B-C21. Based on observations made with the Gran Telescopio Canarias (GTC), installed in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofísica de Canarias, in the island of La Palma. This study makes use of data from AEGIS, a multiwavelength sky survey conducted with the Chandra, GALEX, Hubble, Keck, CFHT, MMT, Subaru, Palomar, Spitzer, VLA, and other telescopes and supported in part by the NSF, NASA, and the STFC. Based on observations obtained with MegaPrime/Mega-Cam, 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. Based on observations obtained with WIRCam, a joint project of CFHT, Taiwan, Korea, Canada, France, at the Canada–France–Hawaii Telescope (CFHT), which is operated by the National Research Council (NRC)of Canada, the Institute National des Sciences de l’Univers of the Centre National de la Recherche Scientifique of France, and the University of Hawaii. This work is based in part on data products produced at TERAPIX, the WIRDS (WIRcam Deep Survey)consortium, and the Canadian Astronomy Data Centre. This research was supported by a grant from the Agence Nationale de la Recherche ANR-07-BLAN-0228.
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