The OTELO survey. I. Description, data reduction, and multi-wavelength catalogue

DOI: 
10.1051/0004-6361/201833294
Publication date: 
01/11/2019
Main author: 
Bongiovanni, Ángel
IAA authors: 
Cerviño, Miguel;Alfaro, Emilio;Fernández-Lorenzo, Mirian;Pović, Mirjana
Authors: 
Bongiovanni, Ángel;Ramón-Pérez, Marina;Pérez García, Ana María;Cepa, Jordi;Cerviño, Miguel;Nadolny, Jakub;Pérez Martínez, Ricardo;Alfaro, Emilio;Castañeda, Héctor O.;de Diego, José A.;Ederoclite, Alessandro;Fernández-Lorenzo, Mirian;Gallego, Jesús;González, José Jesús;González-Serrano, José Ignacio;Lara-López, Maritza A.;Oteo Gómez, Iván;Padilla Torres, Carmen P.;Pintos-Castro, Irene;Pović, Mirjana;Sánchez-Portal, Miguel;Jones, Heath;Bland-Hawthorn, Joss;Cabrera-Lavers, Antonio
Journal: 
Astronomy and Astrophysics
Refereed: 
Yes
Publication type: 
Article
Volume: 
631
Pages: 
A9
Abstract: 
Context. The evolution of galaxies through cosmic time is studied observationally by means of extragalactic surveys. The usefulness of these surveys is greatly improved by increasing the cosmological volume, in either depth or area, and by observing the same targets in different wavelength ranges. A multi-wavelength approach using different observational techniques can compensate for observational biases. <BR /> Aims: The OTELO survey aims to provide the deepest narrow-band survey to date in terms of minimum detectable flux and emission line equivalent width in order to detect the faintest extragalactic emission line systems. In this way, OTELO data will complements other broad-band, narrow-band, and spectroscopic surveys. <BR /> Methods: The red tunable filter of the OSIRIS instrument on the 10.4 m Gran Telescopio Canarias (GTC) is used to scan a spectral window centred at 9175 Å, which is free from strong sky emission lines, with a sampling interval of 6 Å and a bandwidth of 12 Å in the most deeply explored EGS region. Careful data reduction using improved techniques for sky ring subtraction, accurate astrometry, photometric calibration, and source extraction enables us to compile the OTELO catalogue. This catalogue is complemented with ancillary data ranging from deep X-ray to far-infrared, including high resolution HST images, which allow us to segregate the different types of targets, derive precise photometric redshifts, and obtain the morphological classification of the extragalactic objects detected. <BR /> Results: The OTELO multi-wavelength catalogue contains 11 237 entries and is 50% complete at AB magnitude 26.38. Of these sources, 6600 have photometric redshifts with an uncertainty δ z<SUB>phot</SUB> better than 0.2 (1+z<SUB>phot</SUB>). A total of 4336 of these sources correspond to preliminary emission line candidates, which are complemented by 81 candidate stars and 483 sources that qualify as absorption line systems. The OTELO survey results will be released to the public on the second half of 2019.
Database: 
ADS
SCOPUS
URL: 
https://www.scopus.com/inward/record.uri?eid=2-s2.0-85082685989&doi=10.1051%2f0004-6361%2f201833294&partnerID=40&md5=54a7b2a6a4621050e69327336cede0c7
ADS Bibcode: 
2019A&A...631A...9B
Keywords: 
techniques: imaging spectroscopy;surveys;quasars: emission lines;galaxies: statistics