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Carnegie supernova project-II: The near-infrared spectroscopy program
(Institute of Physics Publishing, 2019)
Shifting the focus of Type Ia supernova (SN Ia) cosmology to the near infrared (NIR) is a promising way to significantly reduce the systematic errors, as the strategy minimizes our reliance on the empirical width-luminosity ...
New observational constraints on interacting dark energy using galaxy clusters virial equilibrium states
(2019-12-01)
The nature of the dark sector components of the Universe still remains one of the largest unknown. Among many possibilities, it has been speculated that dark matter and dark energy may be more tightly coupled than usually ...
OBSERVANDO O INVISÍVEL: A RELAÇÃO TRANSFERENCIAL A PARTIR DOS DISCURSOS ENTRE CRIANÇAS E PROFESSORAS MONITORAS EM UM OBSERVATÓRIO ASTRONÔMICO
(Faculdade de Educação da Universidade Federal de Minas Gerais, 2021-06-11)
The main purpose of this research is to interpret the discourses of the transferencial relations between children and monitors teachers in an astronomical observatory. In this regard, the concepts of transference and ...
Monte Carlo studies for the optimisation of the Cherenkov Telescope Array layout
(2019-09-01)
The Cherenkov Telescope Array (CTA) is the major next-generation observatory for ground-based very-high-energy gamma-ray astronomy. It will improve the sensitivity of current ground-based instruments by a factor of five ...
The Gemini NICI planet-finding campaign: the frequency of giant planets around young B and A stars
(Chicago, 2013)
We have carried out high contrast imaging of 70 young, nearby B and A stars to search for brown dwarf and planetary companions as part of the Gemini NICI Planet-Finding Campaign. Our survey represents the largest, deepest ...
Supra-galactic colour patterns in globular cluster systems
(Wiley Blackwell Publishing, Inc, 2017-07)
An analysis of globular cluster systems associated with galaxies included in the Virgo and Fornax Hubble Space Telescope-Advanced Camera Surveys reveals distinct (g − z) colour modulation patterns. These features appear ...
A New Method to Estimate Cloud Cover Fraction over El Leoncito Observatory from an All- Sky Imager Designed for Upper Atmosphere Studies
(IOP Publishing, 2013-01)
A method for determining cloud cover fraction over El Leoncito Observatory (31.8°S, 69.3°W) is presented. Data from an all-sky imaging system, designed to measure nightglow originating from the mesosphere and thermosphere, ...
Production of gamma rays and neutrinos in the dark jets of the microquasar SS433
(Oxford University Press, 2008-12)
We study the spectral energy distribution of gamma rays and neutrinos in the precessing microquasar SS433 as a result of pp interactions within its dark jets. Gamma-ray absorption due to interactions with matter of the ...
Simultaneous K and L-band spectroscopy of Be stars: circumstellar envelope properties from hydrogen emission lines
(Iop Publishing, 2010-04)
We present medium-resolution K- and L-band spectra of a sample of eight Be stars, obtained with Gemini/ NIRI. The IR K and L bands contain many lines of different hydrogen series that are used as a diagnosis to the physical ...
Search for gamma-ray emission from star-forming galaxies with Fermi LAT
(2016-08)
Recent studies have found a positive correlation between the star-formation rate of galaxies and their gamma-ray luminosity. Galaxies with a high star-formation rate are expected to produce a large amount of high-energy ...