Results 11 to 20 of about 109,816 (295)
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. +4 more
doaj +1 more source
Magnetic spiral arms and galactic outflows [PDF]
Monthly Notices of the Royal Astronomical Society: Letters, 2014 AbstractGalactic magnetic arms have been observed between the gaseous arms of some spiral galaxies; their origin remains unclear. We suggest that magnetic spiral arms can be naturally generated in the interarm regions because the galactic fountain flow or wind is likely to be weaker there than in the arms.
Chamandy L, Shukurov A, Subramanian K
openaire +3 more sources
Planet-driven Spiral Arms in Protoplanetary Disks. I. Formation Mechanism [PDF]
, 2017 Protoplanetary disk simulations show that a single planet can excite more than one spiral arm, possibly explaining the recent observations of multiple spiral arms in some systems. In this paper, we explain the mechanism by which a planet excites multiple
Bae, Jaehan, Zhu, Zhaohuan
core +3 more sources
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
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 +2 more
openaire +2 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 +6 more
doaj +1 more source
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 +2 more
openaire +3 more sources
The dynamics of long-lived spiral arms
EPJ Web of Conferences, 2012 It has been believed that spiral arms in pure stellar disks decay in several galactic rotations due to the heating by the spiral arms. However, it might be caused by a numerical heating.
Wada K. +5 more
doaj +1 more source
Spiral and bar driven peculiar velocities in Milky Way sized galaxy simulations [PDF]
, 2015 We investigate the kinematic signatures induced by spiral and bar structure in a set of simulations of Milky Way-sized spiral disc galaxies. The set includes test particle simulations that follow a quasi-stationary density wave-like scenario with rigidly
Bovy, Jo +7 more
core +3 more sources
CHARACTERIZING SPIRAL ARM AND INTERARM STAR FORMATION [PDF]
The Astrophysical Journal, 2016 ABSTRACT Interarm star formation contributes significantly to a galaxy’s star formation budget and provides an opportunity to study stellar birthplaces unperturbed by spiral arm dynamics. Using optical integral field spectroscopy of the nearby galaxy NGC 628 with VLT/MUSE, we construct Hα maps including detailed corrections for dust ...
Kreckel, K. +6 more
openaire +5 more sources