A simultaneous search for high-z LAEs and LBGs in the SHARDS survey

Arrabal Haro, P.; Rodríguez Espinosa, J. M.; Muñoz-Tuñón, C.; Pérez-González, P. G.; Dannerbauer, H.; Bongiovanni, Á.; Barro, G.; Cava, A.; Lumbreras-Calle, A.; Hernán-Caballero, A. et al.
Bibliographical reference

Monthly Notices of the Royal Astronomical Society, Volume 478, Issue 3, p.3740-3755

Advertised on:
We have undertaken a comprehensive search for both Lyman alpha emitters (LAEs) and Lyman break galaxies (LBGs) in the Survey for High-z Absorption Red and Dead Sources (SHARDS) Survey of the Great Observatories Origins Deep Survey North field. SHARDS is a deep imaging survey, made with the 10.4 m Gran Telescopio Canarias, employing 25 medium band filters in the range from 500 to 941 nm. This is the first time that both LAEs and LBGs are surveyed simultaneously in a systematic way in a large field. We draw a sample of 1558 sources; 528 of them are LAEs. Most of the sources (1434) show rest-frame UV continua. A minority of them (124) are pure LAEs with virtually no continuum detected in SHARDS. We study these sources from z ˜ 3.35 up to z˜ 6.8, well into the epoch of reionization. Note that surveys done with just one or two narrow band filters lack the possibility to spot the rest-frame UV continuum present in most of our LAEs. We derive redshifts, star formation rates, Lyα equivalent widths, and luminosity functions (LFs). Grouping within our sample is also studied, finding 92 pairs or small groups of galaxies at the same redshift separated by less than 60 comoving kpc. In addition, we relate 87 and 55 UV-selected objects with two known overdensities at z = 4.05 and z = 5.198, respectively. Finally, we show that surveys made with broad-band filters are prone to introduce many unwanted sources (˜20 per cent interlopers), which means that previous studies may be overestimating the calculated LFs, specially at the faint end.
Related projects
Project Image
Starbursts in Galaxies GEFE

Starsbursts play a key role in the cosmic evolution of galaxies, and thus in the star formation (SF) history of the universe, the production of metals, and the feedback coupling galaxies with the cosmic web. Extreme SF conditions prevail early on during the formation of the first stars and galaxies, therefore, the starburst phenomenon constitutes a

Muñoz Tuñón
Project Image
Evolution of Galaxies

Galaxy evolution is a crucial topic in modern extragalactic astrophysics, linking cosmology to the Local Universe. Their study requires collecting statistically significant samples of galaxies of different luminosities at different distances. It implies the ability to observe faint objects using different techniques, and at different wavelengths

Cepa Nogue
Galaxy proto-cluster
Molecular Gas and Dust in Galaxies Across Cosmic Time

Two of the most fundamental questions in astrophysics are the conversion of molecular gas into stars and how this physical process is a function of environments on all scales, ranging from planetary systems, stellar clusters, galaxies to galaxy clusters. The main goal of this internal project is to get insight into the formation and evolution of