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A Ks-band-selected catalogue of objects in the ALHAMBRA survey

AuthorsNieves-Seoane, L.; Fernández-Soto, Alberto CSIC ORCID CVN ; Arnalte-Mur, P. CSIC ORCID; Molino, Alberto CSIC ORCID; Stefanon, Mauro; Ferreras, I.; Ascaso, Begoña CSIC ORCID; Ballesteros, F. J.; Cristóbal-Hornillos, David CSIC; López-Sanjuan, C.; Hurtado-Gil, L.; Márquez, Isabel CSIC ORCID; Masegosa, Josefa CSIC ORCID ; Aguerri, J.A.L.; Alfaro, Emilio J. CSIC ORCID CVN ; Aparicio Villegas, Teresa CSIC; Benítez, Narciso CSIC ORCID; Broadhurst, T.; Cabrera-Caño, Jesús; Castander, Francisco J. CSIC ORCID; Cepa, Jordi; Cerviño, Miguel CSIC ORCID CVN ; González Delgado, Rosa M. CSIC ORCID ; Husillos, César CSIC ORCID; Infante, Leopoldo; Martínez, Vicente J.; Moles, Mariano CSIC; Olmo, Ascensión del CSIC ORCID; Perea, Jaime CSIC ORCID; Pović, Mirjana; Prada, Francisco CSIC ORCID ; Quintana, José María CSIC; Troncoso Iribarren, P.; Viironen, Kerttu
KeywordsCosmology: observations
Galaxies: evolution
Issue Date23-Sep-2016
PublisherOxford University Press
CitationMonthly Notices of the Royal Astronomical Society 464(4): 4331-4348 (2017)
AbstractThe original ALHAMBRA catalogue contained over 400 000 galaxies selected using a synthetic F814W image, to the magnitude limit AB(F814W) ≈ 24.5. Given the photometric redshift depth of the ALHAMBRA multiband data (〈 z〉 = 0.86) and the approximately I-band selection, there is a noticeable bias against red objects at moderate redshift.We avoid this bias by creating a new catalogue selected in the Ks band. This newly obtained catalogue is certainly shallower in terms of apparent magnitude, but deeper in terms of redshift, with a significant population of red objects at z > 1. We select objects using the Ks band images, which reach an approximate AB magnitude limit Ks ≈ 22. We generate masks and derive completeness functions to characterize the sample. We have tested the quality of the photometry and photometric redshifts using both internal and external checks. Our final catalogue includes ≈95 000 sources down to Ks ≈ 22, with a significant tail towards high redshift. We have checked that there is a large sample of objects with spectral energy distributions that correspond to that of massive, passively evolving galaxies at z > 1, reaching as far as z ≈ 2.5. We have tested the possibility of combining our data with deep infrared observations at longer wavelengths, particularly Spitzer IRAC data. © 2016 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society.
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