Probing the Radio Loud/Quiet AGN dichotomy with quasar clustering

We investigate the clustering properties of 45441 radio-quiet quasars (RQQs) and 3493 radio-loud quasars (RLQs) drawn from a joint use of the Sloan Digital Sky Survey (SDSS) and Faint Images of the Radio Sky at 20 cm (FIRST) surveys in the range $0.3<z<2.3$. This large spectroscopic quasar sample allow us to investigate the clustering signal dependence on radio-loudness and black hole (BH) virial mass. We find that RLQs are clustered more strongly than RQQs in all the redshift bins considered. We find a real-space correlation length of $r_{0}=6.59_{-0.24}^{+0.33}\,h^{-1}\,\textrm{Mpc}$ and $r_{0}=10.95_{-1.58}^{+1.22}\,h^{-1}\,\textrm{Mpc}$ {\normalsize{}for} RQQs and RLQs, respectively, for the full redshift range. This implies that RLQs are found in more massive host haloes than RQQs in our samples, with mean host halo masses of $\sim4.9\times10^{13}\,h^{-1}\,M_{\odot}$ and $\sim1.9\times10^{12}\,h^{-1}\,M_{\odot}$, respectively. Comparison with clustering studies of different radio source samples indicates that this mass scale of $\gtrsim1\times10^{13}\,h^{-1}\,M_{\odot}$ is characteristic for the bright radio-population, which corresponds to the typical mass of galaxy groups and galaxy clusters. The similarity we find in correlation lengths and host halo masses for RLQs, radio galaxies and flat-spectrum radio quasars agrees with orientation-driven unification models. Additionally, the clustering signal shows a dependence on black hole (BH) mass, with the quasars powered by the most massive BHs clustering more strongly than quasars having less massive BHs. We suggest that the current virial BH mass estimates may be a valid BH proxies for studying quasar clustering. We compare our results to a previous theoretical model that assumes that quasar activityComment: 15 pages, 13 figures, A&A in pres

Presentación de proyecto

Fil: Retana, Camilo. Universidad Nacional de La Plata. Facultad de Humanidades y Ciencias de la Educación; Argentina

Marco Retana, Double Bass

Kol Nidrei / Max Bruch; Cello Suite No. 3, BWV 1009 / Johann Sebastian Bach; Concerto Op. 3 / Serge Koussevitzky; Intermezzo from Cavalleria rusticana / Pietro Mascagn

The Dangerous Discourse of Dianetics: Linguistic Manifestations of Violence Toward Queerness in the Canonical Religious Philosophy of Scientology

At present, there is a groundswell of public sensational interest in the subject of Scientology; and, in fact, in the time since I began this research paper, a nine-episode documentary series has premiered and reached finale on A&E titled “Scientology and the Aftermath”— a personal project hosted by sitcom celebrity, ex-Scientologist, and author of Troublemaker: Surviving Hollywood and Scientology, Leah Remini.[1] I could not begin to enumerate the myriad exposés/memoirs of ex-Scientologists that have been published in recent years nor could I emphasize enough the rampant conspiracy theories that are at the disposal of any curious mind on what many have termed “the cult” of Scientology. Be forewarned that a simple internet search of “Scientology” plus “Violence” will surely coax one down the rabbit hole of research. I anticipate, however, that a conjunction of the terms “Scientology” and “Homophobia” might prove exceedingly enlightening. [1] Leah Remini: Scientology and the Aftermath. “Disconnection.” Episode 1. Produced by Leah Remini, Eli Holzman, Aaron Saidman, Alex Weresow. A&E, Nov 29, 2016-Jan 17, 2017 ; Remini, Leah, and Paley, Rebecca. Troublemaker : Surviving Hollywood and Scientology. First ed. New York: Ballantine Books, 2015

Las artimañas de la moda : Hacia un análisis del disciplinamiento en el vestido

Fil: Retana, Camilo. Universidad Nacional de La Plata. Facultad de Humanidades y Ciencias de la Educación. Instituto de Investigaciones en Humanidades y Ciencias Sociales (UNLP-CONICET); Argentina

Salinity Transport in a Finite-Volume Sigma-Layer Three-Dimensional Model

The objective of this study was to develop a 3-D model for The Pontchartrain Estuary that was capable of long-term mass conservative simulation of salinities. This was accomplished in a multi-stage approach involving: a physical model of salinity exchange through a pass; a 3-D FVCOM model of the physical experiment; the development and testing of an FVCOM model for an idealized Pontchartrain Basin; and for the entire estuary. The data from the physical model tests were used to validate the performance of the FVCOM model with density-driven flows. These results showed that hydrostatic FVCOM captured the primary internal wave movement. The idealized basin simulations were used to evaluate several issues related to salinity transport, namely the relative importance of baroclinic forcing, tidal forcing and hydrology. The idealized domain also permitted the testing of sigma-gradients, spatial distribution of friction coefficients, wind stress and various boundary treatments. The results showed that the density-driven exchange of saltwater at the open boundary required a baroclinic boundary condition for salinity as well as a lateral filter at the boundary on each sigma layer. A new radiative baroclinic open boundary condition was developed for FVCOM. When tides and hydrology were included, the FVCOM model was shown to reproduce the seasonal salinity that has been observed for long-term periods. It was also found that the simulation of tides and salinity in FVCOM is very sensitive to the spatial distribution of the friction coefficient; relatively low friction was required in the open water regions and high friction was needed in the passes and waterways to reproduce the tides and salinity distribution. A variable friction coefficient option was coded on FVCOM. The findings from the idealized model were utilized to setup two models for the actual estuary. Both models extend from Lake Maurepas, one to the Chandeleurs Islands and the other to Mobile Bay. The baroclinic open boundary and variable friction were implemented in these models. They were calibrated for tides and salinity. The 2008 Bonnet Carré Spillway Opening was applied to the first model. A tidal pumping effect in Lake Pontchartrain was observed and captured by the model