Context. Extragalactic surveys are a key tool in better understanding the evolution of galaxies. Both deep and wide surveys are improving the emerging picture of physical processes that take place in and around galaxies and identifying which of these processes are the most important in shaping the properties of galaxies. Aims. The Lockman-SpReSO survey aims to provide one of the most complete optical spectroscopic follow-ups of far-infrared (FIR) sources detected by the Herschel Space Observatory in the Lockman Hole field. Such a large optical spectroscopic sample of FIRselected galaxies will supply valuable information about the relation between fundamental FIR and optical parameters (including extinction, star formation rate and gas metallicity). In this article, we introduce and provide an in-depth description of the Lockman-SpReSO survey and of its early results. Methods. We have selected FIR sources from the observations of the Herschel telescope over the central 24 arcmin × 24 arcmin of the Lockman Hole field with an optical counterpart up to 24.5 R C (AB). The sample comprises 956 Herschel FIR sources plus 188 interesting additional objects in the field. The faint component of the catalogue (R C (AB)≥20) was observed using the OSIRIS instrument on the 10.4 m Gran Telescopio Canarias (GTC) in MOS mode. The bright component was observed using two multifibre spectrographs: the AF2-WYFFOS at the William Herschel Telescope (WHT) and the Hydra instrument at the WYIN telescope. Results. From an input catalogue of 1144 sources, we have measured a secure spectroscopic redshift (up to z ∼ 5) for 357 sources with at least two spectral lines identified. In addition, for 99 sources that show only one emission or absorption line, a spectroscopic redshift was postulated based on the line and object properties and photometric redshift. At the same time, fluxes, equivalent widths and signalto-noise ratios were measured. SED fits were performed using the CIGALE software for the 456 objects for which spectroscopic redshifts were determined. To characterise the sample of objects in more depth, both the stellar mass and the infrared luminosity of the objects were derived from the fits.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.