We present the results of our search near the end of the Reionization Epoch for faint galaxies. This has been done using very deep OSIRIS images obtained at the...
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PublicationGran Telescopio Canarias observations of an overdense region of Lyman α emitters at z = 6.5
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PublicationGRB 050904 at redshift 6.3: observations of the oldest cosmic explosion after the Big Bang
We present optical and near-infrared observations of the afterglow of the gamma-ray burst GRB 050904. We derive a photometric redshift z = 6.3, estimated from...
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PublicationGRB 080913 at Redshift 6.7
We report on the detection by Swift of GRB 080913, and subsequent optical/near-infrared follow-up observations by GROND, which led to the discovery of its...
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PublicationHigh z Radio-Loud and Radio-Quiet QSO Environments
We propose a systematic study of the environments of a representative sample of Radio Loud Quasars (RLQ) and Radio Quiet Quasars (RQQ) in two different redshift...
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PublicationHigh-redshift lensed galaxies
We present the results obtained from our deep survey of lensing clusters aimed at constraining the abundance of star-forming galaxies at z˜6 11.
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PublicationIs the Bremer Deep Field reionized, at z ∼ 7?
We show herein that the population of star-forming galaxies in the Bremer Deep Field (BDF) has enough ionizing power to form two large ionized bubbles that...
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PublicationJWST Constraints on the UV Luminosity Density at Cosmic Dawn: Implications for 21 cm Cosmology
An unprecedented array of new observational capabilities are starting to yield key constraints on models of the epoch of first light in the Universe. In this...
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PublicationLarge Scale Absorbers in the Environment of High-z Radio-Galaxies
We discuss a number of interesting questions that arise from studies of extended absorbers observed in high redshift radio-galaxies. We propose to carry out 2-D...
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TalkLet there be light: galaxy formation for the novice
The origin of the galaxies represents an important focus of current cosmological research, both observational and theoretical. Its resolution involves a...