Infrared Magnitude-Redshift Relations for Luminous Radio Galaxies

Infrared magnitude-redshift relations for the 3CR and 6C samples of radio galaxies are presented for a wide range of plausible cosmological models, including those with non-zero cosmological constant OmegaLambda. Variations in the galaxy formation redshift, metallicity and star formation history are also considered. The results of the modelling are displayed in terms of magnitude differences between the models and no-evolution tracks, illustrating the amount of K-band evolution necessary to account for the observational data. Given a number of plausible assumptions, the results of these analyses suggest that: (i) cosmologies which predict T_0xH_0>1 (where T_0 denotes the current age of the universe) can be excluded; (ii) the star formation redshift should lie in the redshift interval 5<z<20, values towards the lower end of the range being preferred in cosmologies with larger values of T_0xH_0; (iii) the Einstein-de Sitter model provides a reasonable fit to the data; (iv) models with finite values of OmegaLambda can provide good agreement with the observations only if appropriate adjustments of other parameters such as the galaxy metallicities and star-formation histories are made. Without such modifications, even after accounting for stellar evolution, the high redshift radio galaxies are more luminous (ie. more massive) than those nearby in models with finite OmegaLambda, including the favoured model with Omega=0.3, OmegaLambda=0.7. For cosmological models with larger values of T_0xH_0, the conclusions are the same regardless of whether any adjustments are made or not. The implications of these results for cosmology and models of galaxy formation are discussed.Comment: 14 pages, LaTeX, 9 figures, accepted for publication in MNRAS. Replacement corrects some annoying typo

Desempenho e digestibilidade in vivo de cordeiros alimentados com dietas contendo canola em grão integral em diferentes formas Performance and digestibility in vivo of lambs fed diets with whole canola grain in different forms

O desempenho e a digestibilidade dos nutrientes de cordeiros alimentados com concentrados formulados com farelo de soja (FS), canola integral (CI) canola quebrada (CQ) ou canola peletizada (CP) e feno de aveia, fornecidos na relação 30/70 (volumoso/conconcentrado, %MS) foram avaliados. Vinte oito cordeiros machos com idade inicial entre 60 e 90 dias e 17 kg PV foram distribuídos em delineamento inteiramente casualizado. As ingestões (g/d) de MS, PB, FDA, FDN e EB (Mcal/dia), o ganho médio diário e a conversão alimentar, foram semelhantes. Não houve diferenças para digestibilidade aparente da MS, PB e EB, exceto para digestibilidade de FDN (46,84; 60,11; 50,10; e 38,88%) e FDA (45,84; 54,19; 46,57; e 29,59%) para FS, CI, CQ e CP, respectivamente. Houve menor retenção de nitrogênio para CP (3,0 g/d) em comparação às outras dietas (entre 5,0 e 7,3 g/d). Os tratamentos não diferiram na concentração de propionato, mas reduziram as concentrações de butirato (7,08; 4,87; 4,08; e 4,29 &#956;M/mL de líquido ruminal) e N-amoniacal (12,17; 8,69; 8,40; e 7,66 mg/100 mL de líquido de rúmen). O uso de canola, nas diferentes formas, não influenciou a ingestão e a digestão, proporcionando desempenho semelhante entre os tratamentos.<br>The performance and digestibility of nutrients of lambs fed concentrates formulated with soybean meal (SM) and whole canola grain (WC), cracked canola grain (CC) or pelleted canola (PC) and oat hay, fed in a 30:70 (forage to concentrate ratio, %DM) were evaluated. Twenty-eight male lambs with initial age from 60 to 90 days and 17 kg LW were allotted to a completely randomized design. The intakes (g/d) of DM, CP, ADF, NDF and GE (Mcal/d), the average daily gain and feed: gain ratio, were similar. There were no differences for apparent digestibilities of MS, PB and GE, except for the NDF digestibility (46.84, 60.11, 50.10, and 38.88%) and ADF (45.84, 54.19, 46.57, and 29.59%) for SM, WC, CC and PC, respectively. There was lower nitrogen retention for CP (3.0 g/d) comparing to the other diets (between 5.0 and 7.3 g/d). The treatments did not differ on the propionate concentration, but reduced the concentrations of butyrate (7.08, 4.87, 4.08, and 4.29 &#956;M/mL of ruminal fluid) and ammonia-N (12.17, 8.69, 8.40, and 7.66 mg/100 mL of ruminal fluid). The use of canola, in the different forms, did not affect the intake and digestion, providing similar performance among the treatments

The Spitzer Extragalactic Representative Volume Survey (SERVS): Survey Definition and Goals (PASP, 124, 714, [2012])

No description supplie

The Spitzer Extragalactic Representative Volume Survey (SERVS): Survey Definition and Goals

We present the Spitzer Extragalactic Representative Volume Survey (SERVS), an 18 square degrees medium-deep survey at 3.6 and 4.5 microns with the post-cryogenic Spitzer Space Telescope to ~2 microJy (AB=23.1) depth of five highly observed astronomical fields (ELAIS-N1, ELAIS-S1, Lockman Hole, Chandra Deep Field South and XMM-LSS). SERVS is designed to enable the study of galaxy evolution as a function of environment from z~5 to the present day, and is the first extragalactic survey both large enough and deep enough to put rare objects such as luminous quasars and galaxy clusters at z>1 into their cosmological context. SERVS is designed to overlap with several key surveys at optical, near- through far-infrared, submillimeter and radio wavelengths to provide an unprecedented view of the formation and evolution of massive galaxies. In this paper, we discuss the SERVS survey design, the data processing flow from image reduction and mosaicing to catalogs, as well as coverage of ancillary data from other surveys in the SERVS fields. We also highlight a variety of early science results from the survey.Comment: 21 pages, 23 figures, published in PASP. This version differs slightly from PASP, mainly due to formatting issues. Figure 2 was also corrected from the previous versio

The DarkSide program at LNGS

(The DarkSide Collaboration) The DarkSide program at Laboratori Nazionali del Gran Sasso aims to perform background-free WIMP searches using double phase liquid argon time projection chambers, with the ultimate goal of covering all parameters down to the so-called neutrino floor. One of the distinct features of the program is the use of underground argon with has a reduced content of the $radioactive^{39}$ Ar compared to atmospheric argon. The DarkSide Collaboration is currently operating the DarkSide-50 experiment, the first such WIMP detector using underground argon, resulting in the best WIMP limits obtained with argon. The results obtained with DarkSide-50 and the plans for the next steps of the DarkSide program, the 20 t fiducial mass DarkSide-20k detector and the 200 t fiducial Argo, are reviewed in this proceedings

New Physics Results from DarkSide-50

International audienceDarkSide-50 is dual-phase liquid argon time projection chamber designed for WIMP search and installed at Gran Sasso underground laboratory. We present new constraints on dark matter particles scattering off nuclei and electrons from a 532.4 live-days exposure