We present an analysis of the environment of six QSO triplets at 1 . z . 1.5 by analyzing multiba... more We present an analysis of the environment of six QSO triplets at 1 . z . 1.5 by analyzing multiband (r, i, z, or g, r, i) images obtained with Megacam at the CFHT telescope, aiming to investigate whether they are associated or not with galaxy protoclusters. This was done by using photometric redshifts trained using the high accuracy photometric redshifts of the COSMOS2015 catalogue. To improve the quality of our photometric redshift estimation, we included in our analysis near-infrared photometry (3.6 and 4.5μm) from the unWISE survey available for our fields and the COSMOS survey. This approach allowed us to obtain good photometric redshifts with dispersion, as measured with the robust σNMAD statistics (which scales as (1+z)−1), of∼0.04 for our six fields. Our analysis setup was reproduced on lightcones constructed from the Millennium Simulation data and the latest version of the L-GALAXIES semi-analytic model to verify the protocluster detectability in such conditions. The density...
Monthly Notices of the Royal Astronomical Society, 2021
The progenitors of present-day galaxy clusters give important clues about the evolution of the la... more The progenitors of present-day galaxy clusters give important clues about the evolution of the large-scale structure, cosmic mass assembly, and galaxy evolution. Simulations are a major tool for these studies since they are used to interpret observations. In this work, we introduce a set of ‘protocluster-light-cones’, dubbed PCcones. They are mock galaxy catalogues generated from the Millennium Simulation with the L-GALAXIES semi-analytic model. These light-cones were constructed by placing a desired structure at the redshift of interest in the centre of the cone. This approach allows to adopt a set of observational constraints, such as magnitude limits and uncertainties in magnitudes and photometric redshifts (photo-zs) to produce realistic simulations of photometric surveys. We show that photo-zs obtained with PCcones are more accurate than those obtained directly with the Millennium Simulation, mostly due to the difference in how apparent magnitudes are computed. We apply PCcones...
Monthly Notices of the Royal Astronomical Society, 2020
We present the methods and results of the optical follow-up, conducted by the Transient Optical R... more We present the methods and results of the optical follow-up, conducted by the Transient Optical Robotic Observatory of the South Collaboration, of gravitational wave events detected during the Advanced LIGO–Virgo second observing run (2016 November–2017 August). Given the limited field of view (∼100 arcmin) of our observational instrumentation, we targeted galaxies within the area of high localization probability that were observable from our sites. We analysed the observations using difference imaging, followed by a random forest algorithm to discriminate between real and spurious transients. Our observations were conducted using telescopes at Estación Astrofísica de Bosque Alegre, Cerro Tololo Inter-American Observatory, the Dr. Cristina V. Torres Memorial Astronomical Observatory, and an observing station in Salta, Argentina.
Abstract. We have investigated some statistical properties of integrated spectra of galaxies with... more Abstract. We have investigated some statistical properties of integrated spectra of galaxies with principal component analysis. The projection of the spectra onto the plane defined by the first two principal compo-nents shows that normal galaxies are in a quasi-linear sequence ...
... I. OBSERVATIONS AND DATA CALIBRATION H. QUINTANA,1,2 L. INFANTE, P. FOUQUE,3 ER CARRASCO,4 H.... more ... I. OBSERVATIONS AND DATA CALIBRATION H. QUINTANA,1,2 L. INFANTE, P. FOUQUE,3 ER CARRASCO,4 H. CUEVAS,4,5 G ... 1964; Schombert 1987), occasionally with distortions (Johnstone, Taylor, & Fabian 1991), have multiple or complex nuclei (Rood & Leir 1979), may ...
We present an analysis of the environment of six QSO triplets at 1 . z . 1.5 by analyzing multiba... more We present an analysis of the environment of six QSO triplets at 1 . z . 1.5 by analyzing multiband (r, i, z, or g, r, i) images obtained with Megacam at the CFHT telescope, aiming to investigate whether they are associated or not with galaxy protoclusters. This was done by using photometric redshifts trained using the high accuracy photometric redshifts of the COSMOS2015 catalogue. To improve the quality of our photometric redshift estimation, we included in our analysis near-infrared photometry (3.6 and 4.5μm) from the unWISE survey available for our fields and the COSMOS survey. This approach allowed us to obtain good photometric redshifts with dispersion, as measured with the robust σNMAD statistics (which scales as (1+z)−1), of∼0.04 for our six fields. Our analysis setup was reproduced on lightcones constructed from the Millennium Simulation data and the latest version of the L-GALAXIES semi-analytic model to verify the protocluster detectability in such conditions. The density...
Monthly Notices of the Royal Astronomical Society, 2021
The progenitors of present-day galaxy clusters give important clues about the evolution of the la... more The progenitors of present-day galaxy clusters give important clues about the evolution of the large-scale structure, cosmic mass assembly, and galaxy evolution. Simulations are a major tool for these studies since they are used to interpret observations. In this work, we introduce a set of ‘protocluster-light-cones’, dubbed PCcones. They are mock galaxy catalogues generated from the Millennium Simulation with the L-GALAXIES semi-analytic model. These light-cones were constructed by placing a desired structure at the redshift of interest in the centre of the cone. This approach allows to adopt a set of observational constraints, such as magnitude limits and uncertainties in magnitudes and photometric redshifts (photo-zs) to produce realistic simulations of photometric surveys. We show that photo-zs obtained with PCcones are more accurate than those obtained directly with the Millennium Simulation, mostly due to the difference in how apparent magnitudes are computed. We apply PCcones...
Monthly Notices of the Royal Astronomical Society, 2020
We present the methods and results of the optical follow-up, conducted by the Transient Optical R... more We present the methods and results of the optical follow-up, conducted by the Transient Optical Robotic Observatory of the South Collaboration, of gravitational wave events detected during the Advanced LIGO–Virgo second observing run (2016 November–2017 August). Given the limited field of view (∼100 arcmin) of our observational instrumentation, we targeted galaxies within the area of high localization probability that were observable from our sites. We analysed the observations using difference imaging, followed by a random forest algorithm to discriminate between real and spurious transients. Our observations were conducted using telescopes at Estación Astrofísica de Bosque Alegre, Cerro Tololo Inter-American Observatory, the Dr. Cristina V. Torres Memorial Astronomical Observatory, and an observing station in Salta, Argentina.
Abstract. We have investigated some statistical properties of integrated spectra of galaxies with... more Abstract. We have investigated some statistical properties of integrated spectra of galaxies with principal component analysis. The projection of the spectra onto the plane defined by the first two principal compo-nents shows that normal galaxies are in a quasi-linear sequence ...
... I. OBSERVATIONS AND DATA CALIBRATION H. QUINTANA,1,2 L. INFANTE, P. FOUQUE,3 ER CARRASCO,4 H.... more ... I. OBSERVATIONS AND DATA CALIBRATION H. QUINTANA,1,2 L. INFANTE, P. FOUQUE,3 ER CARRASCO,4 H. CUEVAS,4,5 G ... 1964; Schombert 1987), occasionally with distortions (Johnstone, Taylor, & Fabian 1991), have multiple or complex nuclei (Rood & Leir 1979), may ...
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