We present Wisconsin Hα Mapper observations of ionized gas in the Smith Cloud, a high velocity cloud which Lockman et al. have recently suggested is interacting with the Galactic disk. Our Hα map shows the brightest Hα emission, 0.43± 0.04 R, coincident with the brightest H I, while slightly fainter Hα emission (0.25 ± 0.02 R) is observed in a region with H I intensities < 0.1 times as bright a...

A 13×13 image of Balmer Hα emission at galactic latitude -65 is presented. Sensitivity is limited in part by confusion: the peak-to-valley anisotropy of the Hα surface brightness is ∼0.2 Rayleighs on angular scales of 0.1 to 1.0. The morphology of the Hα emission is similar to that of the 100 μm emission previously observed by the Infrared Astronomical Satellite (IRAS). A point-by-point compari...

Consider a linear Cantor set K, which is the attractor of a linear iterated function system (i.f.s.) Sjx = ρjx + bj , j = 1, . . . , m, on the line satisfying the open set condition (where the open set is an interval). It is known that K has Hausdorff dimension α given by the equation ∑m j=1 ρ α j = 1, and that Hα(K) is finite and positive, where Hα denotes Hausdorff measure of dimension α. We ...

Lewy bodies (LBs) are intraneuronal inclusions consisting primarily of fibrillized human α-synuclein (hα-Syn) protein, which represent the major pathological hallmark of Parkinson's disease (PD). Although doubling hα-Syn expression provokes LB pathology in humans, hα-Syn overexpression does not trigger the formation of fibrillar LB-like inclusions in mice. We hypothesized that interactions betw...

Deep long-slit spectra of the diffuse ionized gas halos of the edge-on spiral galaxies NGC 4302 and UGC 10288 are presented. Emission lines are detected up to about z = 2 kpc in NGC 4302, and to nearly z = 3 kpc on the north side of UGC 10288. For both galaxies, the line ratios [N II]/Hα and [S II]/Hα increase with z in accordance with dilute photo-ionization models. Runs of [S II]/[N II], and ...

Your thesaurus codes are: missing; you have not inserted them ASTRONOMY AND ASTROPHYSICS The relationship between star formation rates and mid-infrared emission in galactic disks Abstract. The Hα and mid-infrared mean disk surface brightnesses are compared in a sample of nearby spirals observed by ISOCAM. This shows that, in spiral disks, dust emission at 7 and 15 µm provides a reasonable star ...

Optical emission lines have now been detected from about 20 high velocity clouds. These emission lines – primarily Hα, secondarily [N ii] and [S ii] – are very faint and diffuse, spread over the surfaces of the clouds. We compile emission line measurements and present a model in which the Hα is recombination caused by photoionizing radiation escaping the Milky Way. In such a model, we infer HVC...

We present values for angular diameter, flux and extinction for 70 Galactic planetary nebulae observed using narrow band filters. Angular diameters are derived using constant emissivity shell and photoionization line emission models. The mean of the results from these two models are presented as our best estimate. Contour plots of 36 fully resolved objects are included and the low intensity con...

We have obtained Hα high spatial and time resolution observations of the upper solar chromosphere and supplemented these with multi-wavelength observations from the Solar Dynamics Observatory (SDO) and the Hinode Extreme-ultraviolet Imaging Spectrometer. The Hα observations were conducted on 2012 February 11 with the Hydrogen-Alpha Rapid Dynamics Camera instrument at the National Solar Observat...

The Hα-line intensity, linear and circular impact polarisation were calculated during the impulsive phase of flares using the density matrix approach. Depolarising effects of diffusive radiation and collisions with thermal electrons are considered for a 3 levels Hydrogen model atom with Zeeman splitting in weak and intermediate magnetic fields. Electron beam energy and angular distributions in ...