Active galactic nuclei, gravitational redshifts, and cosmological tensions

Gravitational redshift is a classical effect of Einstein's General Relativity, already measured in stars, quasars and clusters of galaxies. We here identify the signature of gravitational redshift in the emission lines of active galaxies due to supermassive black holes and discuss their impact on cosmological inference from type Ia supernovae. Firstly, from the full width at half maximum of $H_{\beta}$ lines of 75 Seyfert type I galaxies of the AGN Black Hole Mass Database, we derive a gravitational redshift $z_g = (2.4 \pm 0.9) \times 10^{-4}$. Expanding this analysis to 86755 quasars from DR14 of SDSS we have a mean value $z_g \approx 2.7 \times 10^{-4}$. Then, by comparing the redshifts of 34 lines measured at the central and outer regions of LINER galaxies in the SAMI survey we obtain $z_g = (0.68 \pm 0.09) \times 10^{-4}$. These numbers are compatible with central black holes of $\approx 10^9$ solar masses and broad line regions of $\approx 1$~pc. For non-AGN galaxies the gravitational redshift is compatible with zero and, as they constitute most of SNe Ia host galaxies, the impact on the cosmological parameters is negligible.Comment: 5 pages, 5 figure

Fractionated Martian Atmosphere – the Case of the Nakhlites, Revisited with Experiments

We report on fractionated noble gases in the Martian meterorites - a literature survey and new data

Infinite-cluster geometry in central-force networks

We show that the infinite percolating cluster (with density P_inf) of central-force networks is composed of: a fractal stress-bearing backbone (Pb) and; rigid but unstressed ``dangling ends'' which occupy a finite volume-fraction of the lattice (Pd). Near the rigidity threshold pc, there is then a first-order transition in P_inf = Pd + Pb, while Pb is second-order with exponent Beta'. A new mean field theory shows Beta'(mf)=1/2, while simulations of triangular lattices give Beta'_tr = 0.255 +/- 0.03.Comment: 6 pages, 4 figures, uses epsfig. Accepted for publication in Physical Review Letter

Avaliação inicial do número de cromossomas de três morfotipos de crajiru.

O objetivo deste trabalho foi determinar o número de cromossomas dos três tipos de crajiru existentes na Coleção de Plantas Medicinais, Aromáticas e Condimentares da Embrapa Amazônia Ocidental, buscando contribuir para a caracterização dos acessos

Influência de nitrogênio, micronutrientes e matéria orgânica na produção de melão.

O trabalho constituiu-se de dois experimentos com a cultura do melão (Cucumis melo L.) conduzidos em um Latossolo Vermelho-Amarelo, de textura arenosa no Campo Experimental de Bebedouro, em Petrolina-PE e em um Vertissolo, no Campo Experimental de Mandacaru, em Juazeiro-BA, ambos pertencentes a Embrapa Semi-Árido

Normas de produção de mudas.

As presentes normas objetivam estabelecer condicoes que devem ser obedecidas para a producao de mudas com qualidade e tecnologias aplicadas pela Embrapa Agroindustria Tropical.bitstream/CNPAT-2010/5462/1/Dc-041.pd