The discovery of a relationship between supermassive black hole (SMBH) mass and spiral arm pitch angle (P) is evidence that SMBHs are tied to the overall secular evolution of a galaxy. The discovery of SMBHs in late‐type galaxies with little or no bulge suggests that an underlying correlation between the dark matter halo concentration and SMBH mass (MBH) exists, rather than between the bulge mass and MBH. In this paper we measure P using a two‐dimensional fast Fourier transform and estimate the bar pattern speeds of 40 barred spiral galaxies from the Carnegie‐Irvine Galaxy Survey. The pattern speeds were derived by estimating the gravitational potentials of our galaxies from Ks‐band images and using them to produce dynamical simulation models. The pattern speeds allow us to identify those galaxies with low central dark halo densities, or fast rotating bars, while P provides an estimate of MBH. We find that a wide range of MBH exists in galaxies with low central dark matter halo densities, which appears to support other theoretical results. We also find that galaxies with low central dark halo densities appear to follow more predictable trends in P versus de Vaucouleurs morphological type (T) and bar strength versus T than barred galaxies in general. The empirical relationship between MBH and total gravitational mass of a galaxy (Mtot) allows us to predict the minimum Mtot that will be observationally measured of our fast bar galaxies. These predictions will be investigated in a subsequent paper.

Thin films of tin doped zinc oxide (ZnO: Sn) with thickness 300 ± 30 nm prepared by spray pyrolysis method at substrate temperatures of 400°C. The structure, surface morphological and optical properties were studied, for Two weight ratios of doping (2 and 4) wt %. The results of X-Ray measurements showed that all deposit samples have a polycrystalline pattern with hexagonal wurtzite type structure. The films crystallites were oriented along (002) plane. The morphology measurements obtained by scanning electron microscope (SEM) showed that there is a change in the surface texture by the increasing of tin weight ratios with the rate of porosity of the surface when treating with 4wt %. The measurement of Atomic force microscopy (AFM) revealed nano particles sized and the roughness of the surface decrease to increase deflection, while optical measurements showed a decrease The energy gap of the models that are expected in the undoped samples.

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Thin films of transparent and conductive CdO and B1,3)w% doped cadmium oxide (CdO: B) (1 and 3) wt %, have been deposited using chemical spray pyrolysis (CSP)) technique on glass substrate temperature of 300°C. Microstructural analysis indicates that X-ray diffraction study shows that the obtained films were polycrystalline. The preferred orientation was along the direction (200) and that the average crystallite size increases with the increasing B content. Morphological properties were studied, by scanning electron microscope (SEM) and atomic force microscopy (AFM) which reveals that the grains have a similar column shape. UV-visible transmission spectroscopy reveal that the prepared thin films are transparent in the visible range, The value of the optical band gap obtained shows a slight increase in its values from 2.43 eV to 2.45 eV as B concentration increasing.

Various thin films of cadmium sulfide doped with different weight ratios (wt %) of indium (CdS: In), were prepared on glass substrates by Spray pyrolysis technique (SPT), The Microstructural, topography and optical characteristics were studied. Pure films and doped with In 1%. The results obtained revealed that the growth toward single crystalline hexagonal- cubic phases. The dominant reflection is in the direction (101) plane with a crystalline size 47.55 nm, which is calculated utilizing Scherrer equation. The increase in In to 3% tends the structure to be the poly crystalline with the existence of the prevalent reflection in the direction of (101) plane with a the crystal size of 53.89 nm. The topography measurements showed that the surfaces of the nanostructured are in the form of rods with a height of 1.99 nm and a diameter of 50-60 nm. The rod height decreased with the increasing in doping weight ratios, while the diameter of the rod increased. The optical measurements showed lower transmittance with the increasing of doping from T% 95 to T% 64. A decrease in the optical energy gap value was noticed.