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Uma abordagem estatística sobre a estimação de redshifts de quasares usando dados do S-PLUS
(Universidade Federal de São CarlosUFSCarCâmpus São CarlosEstatística - Es, 2022-09-08)
Redshift is a cosmic index used to measure distances to astronomical objects. The study of this quantity is important for the understanding of the expansion of the Universe and the current objective of the stars, according ...
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 ...
A project to constrain emission from giant gaseous shells around high redshift radio galaxies
(Asociación Argentina de Astronomía, 2015)
Around half of the radio galaxies (radio-loud, type 2 quasars) at 2 are known to show strong Ly absorption features in their spectra, with a spatial extent at least as large as the background Ly nebulae closely associated ...
CAN OLD GALAXIES AT HIGH REDSHIFTS AND BARYON ACOUSTIC OSCILLATIONS CONSTRAIN H(0)?
(IOP PUBLISHING LTD, 2009)
A new age-redshift test is proposed in order to constrain H(0) on the basis of the existence of old high-redshift galaxies (OHRGs). In the flat Lambda cold dark matter model, the value of H(0) is heavily dependent on the ...
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 ...
The Hα luminosity function of galaxies AT z ~ 4.5
(Universidad de Chile, 2022)
The Luminosity Function (LF) is one of the most fundamental observables to study galaxies; moreover, choosing a luminosity tracer that strongly correlates with the Star Formation Rate (SFR) allows us to study the evolution ...
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 ...