Results 31 to 40 of about 12,458 (247)

Measurement of Galactic Logarithmic Spiral Arm Pitch Angle Using Two-Dimensional Fast Fourier Transform Decomposition

, 2012
A logarithmic spiral is a prominent feature appearing in a majority of observed galaxies. This feature has long been associated with the traditional Hubble classification scheme, but historical quotes of pitch angle of spiral galaxies have been almost ...
Barden, Barger, Benjamin L. Davis, Claud H. S. Lacy, Considere, Daniel Kennefick, Davis, de Vaucouleurs, Douglas W. Shields, Eskridge, Ferrarese, Gebhardt, Gebhardt, Graham, Grosbol, Herschel, Ho, Häring, Ivânio Puerari, Jedrzejewski, Joel C. Berrier, Julia Kennefick, Kormendy, Ma, Magorrian, Marc S. Seigar, Marconi, Martínez-García, Press, Puerari, Puerari, Saraiva Schroeder, Seiden, Seigar, Seigar, Sérsic, Thornley, Tody, Vestergaard   +38 more
core   +1 more source

Tracing the spiral arms in IP Pegasi [PDF]

, 2005
We report the analysis of time-resolved spectroscopy of IP Pegasi in outburst with eclipse mapping techniques to investigate the location and geometry of the observed spiral structures.
Baptista, R., Harlaftis, E. T., Marsh, T. R., Morales-Rueda, L., Steeghs, D.   +4 more
core   +4 more sources

The Disk Substructures at High Angular Resolution Project (DSHARP). III. Spiral Structures in the Millimeter Continuum of the Elias 27, IM Lup, and WaOph 6 Disks

, 2018
We present an analysis of Atacama Large Millimeter/submillimeter Array 1.25 mm continuum observations of spiral structures in three protoplanetary disks from the Disk Substructures at High Angular Resolution Project.
Andrews, Sean M., Bai, Xue-Ning, Benisty, Myriam, Birnstiel, Tilman, Carpenter, John M., Dullemond, Cornelis P., Guzmán, Viviana V., Huang, Jane, Hughes, A. Meredith, Isella, Andrea, Pérez, Laura M., Ricci, Luca, Wilner, David J., Zhang, Shangjia, Zhu, Zhaohuan, Öberg, Karin I.   +15 more
core   +4 more sources

Late-type galaxies observed with SAURON. Two-dimensional stellar and emission-line kinematics of 18 spirals [PDF]

, 2005
We present the stellar and gas kinematics of a sample of 18 nearby late-type spiral galaxies (Hubble types ranging from Sb to Sd), observed with the integral-field spectrograph SAURON at the 4.2-m William Herschel Telescope.
Andersen, DR, Cappellari, M, Carollo, CM, de Zeeuw, PT, Emsellem, E, Falcon-Barroso, J, Ganda, K, McDermid, RM, Peletier, RF, Swaters, RA   +9 more
core   +2 more sources

Correlation Statistics of Irregular and Spiral Galaxies Mapped in HI

, 1996
Several measures of galaxy size and mass obtained from the neutral hydrogen mapping of 70 dwarf irregular galaxies presented in Paper I (Hoffman et al. 1996) are compared statistically to those for the set of all available HI-mapped dwarfs and HI-mapped ...
Hoffman, G. L., Salpeter, E. E.
core   +1 more source

The vertical structure and kinematics of grand design spirals [PDF]

, 2014
We use an N-body simulation to study the 3D density distribution of spirals and the resulting stellar vertical velocities. Relative to the disc's rotation, the phase of the spiral's peak density away from the mid-plane trails that at the mid-plane.
Bochanski, Carlin, D'Onghia, Debattista, Faure, Goldreich, Gómez, Ivezic, Julian, Lin, Meidt, Perryman, Prendergast, Rix, Roškar, Schönrich, Schönrich, Sellwood, Sellwood, Sellwood, Sellwood, Sellwood, Sellwood, Sellwood, Sellwood, Siebert, Toomre, Victor P. Debattista, Widrow, Williams, Yanny   +30 more
core   +2 more sources

EBSD Study of Creep‐Induced Lattice Misorientation in MgO‐Particle‐Reinforced Austenitic Steel Composites

Advanced Engineering Materials, EarlyView.
Creep experiments at 900°C on coarse‐grained steel‐ceramic composites containing recycled magnesia reveal that higher ceramic volume fractions significantly enhance the creep resistance. Detailed EBSD investigations identify subgrain formation in the steel matrix as the dominant deformation mechanism.
Moritz Müller, Amaya Compart, Mahnaz Mehdizadehlima, Serhii Yaroshevskyi, Christos G. Aneziris, Horst Biermann, Anja Weidner   +6 more
wiley   +1 more source

Points of bounded height on oscillatory sets

, 2017
We show that transcendental curves in $\mathbb R^n$ (not necessarily compact) have few rational points of bounded height provided that the curves are well behaved with respect to algebraic sets in a certain sense and can be parametrized by functions ...
Comte, Georges, Miller, Chris
core   +2 more sources

4D‐Printed Magneto‐Plasmonic Microrobots for Programmable Spatiotemporal De‐Icing

Advanced Functional Materials, EarlyView.
A 4D‐printing strategy is introduced to achieve programmable de‐icing devices. By aligning gold–magnetite nanofillers within a photosensitive resin, the printed structures exhibit dual magnetic and plasmonic functionalities, enabling precise spatio‐temporal ice removal through thermoplasmonic effects.
Amélie Pérot, Andrea Cosola, Eléonore Aïdonidis, Jérôme Fresnais, Clément Sanchez, Philippe Belleville, Giancarlo Rizza, Marco Faustini   +7 more
wiley   +1 more source

Surface Brightness Profiles of Dwarf Galaxies: I. Profiles and Statistics

, 2013
Radial surface brightness profiles of spiral galaxies are classified into three types: (I) single exponential, or the light falls off with one exponential to a break before falling off (II) more steeply, or (III) less steeply.
Elmegreen, Bruce G., Herrmann, Kimberly A., Hunter, Deidre A.   +2 more
core   +1 more source