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Transport of Internetwork Magnetic Flux Elements in the Solar Photosphere
Rempel, Matthias; Bellot Rubio, Luis R.; Gošić, Milan +2 more
The motions of small-scale magnetic flux elements in the solar photosphere can provide some measure of the Lagrangian properties of the convective flow. Measurements of these motions have been critical in estimating the turbulent diffusion coefficient in flux-transport dynamo models and in determining the Alfvén wave excitation spectrum for corona…
Chlorine Isotope Ratios in M Giants
Pilachowski, C. A.; Maas, Z. G.
We have measured the chlorine isotope ratio in six M giant stars using HCl 1-0 P8 features at 3.7 microns with R ∼ 50000 spectra from Phoenix on Gemini South. The average Cl isotope ratio for our sample of stars is 2.66 ± 0.58 and the range of measured Cl isotope ratios is 1.76 < 35Cl/37Cl < 3.42. The solar system meteo…
Motions in Prominence Barbs Observed on the Solar Limb
Tarbell, T. D.; Kucera, T. A.; Ofman, L.
We analyze and discuss an example of prominence barbs observed on the limb on 2016 January 7 by the Hinode/Solar Optical Telescope in Ca II and Hα, the Interface Region Imaging Spectrograph, with slit jaw images and Mg II spectral data, and the Solar Dynamics Observatory’s Atmospheric Imaging Assembly. In the recent literature there has been a deb…
MUSE observations of the counter-rotating nuclear ring in NGC 7742
Coccato, Lodovico; Sarzi, Marc; Elmegreen, Bruce G. +4 more
Aims: We present results from MUSE observations of the nearly face-on disk galaxy NGC 7742. This galaxy hosts a spectacular nuclear ring of enhanced star formation, which is unusual in that it is hosted by a non-barred galaxy, and because this star formation is most likely fuelled by externally accreted gas that counter-rotates with respect t…
Unveiling the inner morphology and gas kinematics of NGC 5135 with ALMA
Cimatti, A.; Pozzi, F.; Massardi, M. +5 more
The local Seyfert 2 galaxy NGC 5135, thanks to its almost face-on appearance, a bulge overdensity of stars, the presence of a large-scale bar, an active galactic nucleus (AGN) and a supernova remnant, is an excellent target to investigate the dynamics of inflows, outflows, star formation, and AGN feedback. Here, we present a reconstruction of the …
A photometric analysis of Abell 1689: two-dimensional multistructure decomposition, morphological classification and the Fundamental Plane
Dalla Bontà, E.; Davies, R. L.; D'Eugenio, F. +2 more
We present a photometric analysis of 65 galaxies in the rich cluster Abell 1689 at z = 0.183, using the Hubble Space Telescope Advanced Camera for Surveys archive images in the rest-frame V band. We perform two-dimensional multicomponent photometric decomposition of each galaxy adopting different models of the surface-brightness distribution. We p…
LCO observations of a super-critical distorted pulsation in the roAp star J0855 (TYC 2488-1241-1)
Bowman, Dominic M.; Sefako, Ramotholo R.; Holdsworth, Daniel L. +1 more
We report the results of a 60-h photometric campaign of a rapidly oscillating Ap star, J0855 (TYC 2488-1241-1). We have utilized the multi-site Las Cumbres Observatory's (LCO) 0.4-m telescopes to obtain short cadence B-band observations of an roAp star previously lacking detailed study. Our observations confirm the rotation period presented in the…
A Deep X-Ray View of the Synchrotron-dominated Supernova Remnant G330.2+1.0
Temim, Tea; Petre, Robert; Williams, Brian J. +1 more
We present moderately deep (125 ks) XMM-Newton observations of supernova remnant G330.2+1.0. This remnant is one of only a few known that fall into the “synchrotron-dominated” category, with the emission almost entirely dominated by a nonthermal continuum. Previous X-ray observations could only characterize the spectra of a few regions. Here, we e…
SMART-1 technology, scientific results and heritage for future space missions
Grande, M.; Koschny, D.; Grieger, B. +8 more
ESA's SMART-1 mission to the Moon achieved record firsts such as: 1) first Small Mission for Advanced Research and Technology; with spacecraft built and integrated in 2.5 years and launched 3.5 years after mission approval; 2) first mission leaving the Earth orbit using solar power alone; 3) most fuel effective mission (60 L of Xenon) and longest …
Electron-impact excitation of diatomic hydride cations II: OH+ and SH+
Tennyson, Jonathan; Faure, Alexandre; Hamilton, James R.
R-matrix calculations combined with the adiabatic-nuclei-rotation and Coulomb-Born approximations are used to compute electron-impact rotational rate coefficients for two open-shell diatomic cations of astrophysical interest: the hydoxyl and sulphanyl ions, OH+ and SH+. Hyperfine resolved rate coefficients are deduced using t…