Results 21 to 30 of about 109,816 (295)

Measuring Spiral Arm Torques: Results for M100 [PDF]

The Astronomical Journal, 1995
Uuencoded compressed PostScript (300k) - 26 pages, figs. 3-9; submitted to AJ. Full PostScript version (with all figures) is available through anonymous ftp at ftp://astro.princeton.edu/ognedin/Torque/paper.ps or ftp://astro.princeton.edu/library/preprints/pop613.ps.Z or through WWW http://www.astro.princeton.edu/~library/prep ...
GNEDIN, OY, GOODMAN, J, FREI, Z
openaire   +3 more sources

Super Multi-Armed and Segmented Spiral Pattern in a Reaction-Diffusion Model

IEEE Access, 2019
The super multi-armed and segmented (SMAS) spiral pattern has been observed in nature, such as sunflower inflorescence, spiral aloe, pine cone, ball cactus and Roman broccoli, which is characterized by several segmented spiral arms sharing the same ...
Jian Gao, Changgui Gu
doaj   +1 more source

Simulations of the grand design galaxy M51: a case study for analysing tidally induced spiral structure [PDF]

, 2009
We present hydrodynamical models of the grand design spiral M51 (NGC 5194), and its interaction with its companion NGC 5195. Despite the simplicity of our models, our simulations capture the present day spiral structure of M51 remarkably well, and even ...
Agertz, Balbus, Bate, Bate, Bate, Bate, Benz, Bertin, Binney, Blitz, Bottema, Buta, Byrd, Byrd, C. L. Dobbs, C. Theis, Chakrabarti, Chamberlin, Corder, Cox, De Avillez, Dobbs, Dobbs, Dobbs, Dobbs, Dobbs, Dobbs, Donner, Egusa, Elmegreen, Elmegreen, Elmegreen, Elmegreen, Elmegreen, Feitzinger, Gittins, Goldreich, Goldreich, Hernquist, Hitschfeld, J. E. Pringle, Jog, Julian, Jáchym, Kendall, Kim, Koda, Kormendy, Kuijken, La Vigne, Li, Lin, Lin, M. R. Bate, Mark, Martínez-García, Meidt, Merrifield, Monaghan, Oh, Patrikeev, Patsis, Petit, Petsch, Pierce, Press, Price, Price, Price, Price, Price, Rand, Renaud, Roberts, Robertson, Romeo, Rots, Salo, Salo, Schinnerer, Sellwood, Shetty, Shetty, Shetty, Slyz, Sofue, Springel, Springel, Sundelius, Tamburro, Tasker, Tasker, Theis, Theis, Tilanus, Toomre, Toomre, Toomre, Toomre, Toomre, Tosaki, Tully, Vogel, Wada, Wada, Westpfahl, Yáñez, Zaritsky   +107 more
core   +3 more sources

Spiral-arm instability: giant clump formation via fragmentation of a galactic spiral arm [PDF]

Monthly Notices of the Royal Astronomical Society, 2017
Fragmentation of a spiral arm is thought to drive the formation of giant clumps in galaxies. Using linear perturbation analysis for self-gravitating spiral arms, we derive an instability parameter and define the conditions for clump formation. We extend our analysis to multi-component systems that consist of gas and stars in an external potential.
Inoue, Shigeki, Yoshida, Naoki
openaire   +2 more sources

Gas Dynamics in the Milky Way: Second Pattern Speed and Large-Scale Morphology [PDF]

, 2002
We present new gas flow models for the Milky Way inside the solar circle. To this end we use SPH simulations in gravitational potentials determined from the NIR luminosity distribution (including spiral arms) which are based on the COBE/DIRBE maps.
Bissantz, Nicolai, Englmaier, Peter, Gerhard, Ortwin   +2 more
core   +3 more sources

Spiral Arms in Space [PDF]

Nature, 1971
The Spiral Structure of Our Galaxy . Edited by W. Becker and G. Contopoulos. (International Astronomical Union Symposium No. 36, held in Basel, Switzerland, August 29–September 4, 1969.) Pp. xiii + 478. (Reidel: Dordrecht, 1970.) Hfl. 80.
openaire   +1 more source

Analysis of Archimedean Spiral Slot Antennas in Infinite Ground Planes Using the Theory of Characteristic Modes

IEEE Access, 2022
The analysis of Archimedean spiral slots using the theory of characteristic modes is presented in this article. Purely magnetic characteristic modes are used to study the behavior of a spiral slot etched in an infinite ground plane.
Pallavi Sharma, Jennifer T. Bernhard
doaj   +1 more source

Clues to the formation of spiral structure in M51 from the ages and locations of star clusters [PDF]

, 2017
We determine the spatial distributions of star clusters at different ages in the grand-design spiral galaxy M51 using a new catalog based on multi-band images taken with the Hubble Space Telescope (HST). These distributions, when compared with the spiral
Calzetti, Daniela, Chandar, Rupali, Chien, L-H, Dinino, Daiana, Dobbs, Clare, Kennicutt, Robert C, Querejeta, Miguel, Regan, Michael, Schinnerer, Eva, van der Wel, Sharon Meidt, Whitmore, Bradley C   +10 more
core   +1 more source

Theoretical Model of Spiral Rain Clusters and Analysis of Their Horizontal Structure Equation

Atmosphere, 2017
Rain clusters are mesoscale disaster weather systems, and some of rain clusters have spiral structures. In this paper, a theoretical model of spiral rain cluster is established under pseudo-adiabatic approximation, and its horizontal structure equation ...
Jie Yu, Jiquan Zhang, Ming Zhang
doaj   +1 more source

Spiral Density Waves in a Young Protoplanetary Disk [PDF]

, 2016
Gravitational forces are expected to excite spiral density waves in protoplanetary disks, disks of gas and dust orbiting young stars. However, previous observations that showed spiral structure were not able to probe disk midplanes, where most of the ...
Andrews, Sean M., Calvet, Nuria, Carpenter, John M., Chandler, Claire J., Corder, Stuartt A., Deller, Adam T., Dullemond, Cornelis P., Greaves, Jane S., Harris, Robert J., Henning, Thomas, Isella, Andrea, Kwon, Woojin, Lazio, Joseph, Linz, Hendrik, Menten, Karl M., Mundy, Lee G., Pérez, Laura M., Ricci, Luca, Sargent, Anneila I., Storm, Shaye, Tazzari, Marco, Testi, Leonardo, Wilner, David J.   +22 more
core   +3 more sources