Results 31 to 40 of about 559,591 (386)

Mass extinction and the structure of the milky way [PDF]

Serbian Astronomical Journal, 2013
We use the most up-to-date Milky Way model and solar orbit data in order to test the hypothesis that the Sun's galactic spiral arm crossings cause mass extinction events on Earth. To do this, we created a new model of the Milky Way's spiral arms
Filipović M.D., Horner J., Crawford E.J., Tothill N.F.H., White G.L.   +4 more
doaj   +1 more source

Spiral-arm instability – II. Magnetic destabilization [PDF]

Monthly Notices of the Royal Astronomical Society, 2019
Fragmentation of spiral arms can drive the formation of giant clumps and induce intense star formation in disc galaxies. Based on the spiral-arm instability analysis of our Paper I, we present linear perturbation theory of dynamical instability of self-gravitating spiral arms of magnetised gas, focusing on the effect of toroidal magnetic fields. Spiral
Inoue, Shigeki, Yoshida, Naoki
openaire   +2 more sources

Do spiral arms enhance star formation efficiency? [PDF]

Astronomy & Astrophysics
Spiral arms, as those of our own Milky Way, are some of the most spectacular features in disc galaxies. It has been argued that star formation should proceed more efficiently in spiral arms as a result of gas compression.
M. Querejeta, A. Leroy, S. Meidt, E. Schinnerer, F. Belfiore, É. Emsellem, R. Klessen, Jiayi Sun, M. Sormani, Ivana Bevslic, Yixian Cao, M. Chevance, D. Colombo, Daniel A. Dale, S. Garc'ia-Burillo, S. Glover, K. Grasha, B. Groves, E. Koch, Lukas Neumann, H. Pan, I. Pessa, J. Pety, F. Pinna, L. Ramambason, A. Razza, Andrea Romanelli, E. Rosolowsky, Marina Ruiz-Garc'ia, P. S'anchez-Bl'azquez, Rowan J. Smith, S. Stuber, L. Úbeda, A. Usero, T. Williams   +34 more
semanticscholar   +1 more source

Triggered star formation in spiral arms [PDF]

Proceedings of the International Astronomical Union, 2006
AbstractWe present preliminary results for six spiral galaxies from a sample of 25, where we have used the method developed by González & Graham (1996) to search for and analyze azimuthal color gradients across spiral arms. The six galaxies analyzed here are NGC 1703 (SBrb), NGC 3001 (SABrsbc), NGC 3059 (SBrsbc), NGC 3513 (SBrsc), NGC 4593 (RSBrsb),
E. E. Martínez-García, R. A. González-Lópezlira, G. Bruzual   +2 more
openaire   +2 more sources

Detection of the Milky Way spiral arms in dust from 3D mapping [PDF]

Astronomy & Astrophysics, 2018
Large stellar surveys are sensitive to interstellar dust through the effects of reddening. Using extinctions measured from photometry and spectroscopy, together with three-dimensional (3D) positions of individual stars, it is possible to construct a ...
Sara Rezaei Kh., Coryn A. L. Bailer-Jones, David W. Hogg, Mathias Schultheis   +3 more
openalex   +3 more sources

Kinematics of the Local Spiral Structure Revealed by Young Stars in Gaia DR3

The Astrophysical Journal Supplement Series, 2023
Using young open clusters and O–B2-type stars in Gaia Data Release 3, we investigate the kinematics of the local spiral structure. In general, the young sources in the outer spiral arms may present larger peculiar motions than those in the inner spiral ...
Dejian Liu, Ye Xu, Chaojie Hao, Shuaibo Bian, Zehao Lin, Yingjie Li, Jingjing Li   +6 more
doaj   +1 more source

Spiral arms in the protoplanetary disc HD100453 detected with ALMA: evidence for binary–disc interaction and a vertical temperature gradient [PDF]

Monthly notices of the Royal Astronomical Society, 2019
Scattered light high-resolution imaging of the protoplanetary disc orbiting HD100453 shows two symmetric spiral arms, possibly launched by an external stellar companion.
G. Rosotti, M. Benisty, A. Juhász, R. Teague, C. Clarke, C. Dominik, C. Dullemond, P. Klaassen, L. Matrá, T. Stolker   +9 more
semanticscholar   +1 more source

Spiral‐Arm Seismic Arrays

Bulletin of the Seismological Society of America, 2015
Seismic arrays have many uses for signal enhancement, from surface-wave characterization of the near surface to teleseismic detection in the context of monitoring nuclear tests. Many variants of the geometrical configuration of stations have been used with the objective of maximizing potential resolution of the incoming wavefronts di- rection of ...
Kennett, Brian, Stipcevic, Josip, Gorbatov, Alexei   +2 more
openaire   +3 more sources

Binary-induced spiral arms inside the disc cavity of AB Aurigae [PDF]

, 2020
In this work we demonstrate that the inner spiral structure observed in AB Aurigae can be created by a binary star orbiting inside the dust cavity. We find that a companion with a mass-ratio of 0.25, semimajor axis of 40 au, eccentricity of 0.5, and ...
P. Poblete, J. Calcino, N. Cuello, Enrique Mac'ias, 'Alvaro Ribas, Daniel J. Price, J. Cuadra, C. Pinte   +7 more
semanticscholar   +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