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Spectroscopy of High-Redshift Supernovae from the Essence Project: The First Four Years
(2009)
We present the results of spectroscopic observations from the ESSENCE high-redshift supernova (SN) survey during its first four years of operation. This sample includes spectra of all SNe Ia whose light curves were presented ...
Constraining Cosmic Evolution of Type Ia Supernovae
(2008)
We present a large-scale effort of creating composite spectra of high-redshift SNe Ia and comparing them to low-redshift counterparts in an attempt to understand possible cosmic evolution of SNe Ia, which has major ...
Time Dilation in Type Ia Supernova Spectra at High Redshift
(2008)
We present multiepoch spectra of 13 high-redshift Type Ia supernovae (SNe Ia) drawn from the literature, the ESSENCE and SNLS projects, and our own separate dedicated program on the ESO Very Large Telescope. We use the ...
On the evolution of environmental and mass properties of strong lens galaxies in COSMOS
(2011)
Context. Nearly 100 new strong-lens candidates have been discovered in the COSMOS field. Among these, 20 lens candidates with 0.34 ≲ zlens ≲ 1.13 feature multiple images of background sources. Aims. Using the multi-wavelength ...
Time Dilation in Type Ia Supernova Spectra at High Redshift
(2008)
We present multiepoch spectra of 13 high-redshift Type Ia supernovae (SNe Ia) drawn from the literature, the ESSENCE and SNLS projects, and our own separate dedicated program on the ESO Very Large Telescope. We use the ...
Exploring the galaxy cluster-group transition regime at high redshifts. Physical properties of two newly detected z > 1 systems
(2011)
Context: Multi-wavelength surveys for clusters of galaxies are opening a window on the elusive high-redshift (z>1) cluster population. Well controlled statistical samples of distant clusters will enable us to answer questions ...
Constraining the Redshift Evolution of First Radio Sources in RCS1 Galaxy Clusters
(2011)
We conduct a statistical analysis of the radio source population in galaxy clusters as a function of redshift by matching radio sources from the Faint Images of the Radio Sky at Twenty-Centimeters catalog with 618 optically ...