Results 121 to 130 of about 470,379 (288)
A Comprehensive Analysis on the Nature of the Spiral Arms in NGC 3686, NGC 4321, and NGC 2403
GalaxiesIn theoretical investigations, various mechanisms have been put forward to explain the emergence of spiral patterns in galaxies. One of the few ways to find out the nature of spirals in a particular galaxy is to consider the so-called corotation radius ...
Valeria Kostiuk +3 more
doaj +1 more source
The Open Journal of Astrophysics, 2021 Countless low-surface brightness objects - including spiral galaxies, dwarf galaxies, and noise patterns - have been detected in recent large surveys.
Oliver Müller, Eva Schnider
doaj +1 more source
Photometry and kinematics of extragalactic star-forming complexes
Open Astronomy, 2022 We investigate spectral and photometric properties of extragalactic star-forming complexes (SFCs). The SFCs were selected in 17 nearby galaxies of a spiral or irregular type, having inclinations less than 45° and distances less than 15 Mpc.
Kuzin Aleksey, Lisitsin Danil
doaj +1 more source
Gravitational orbits in the expanding Universe revisited
Frontiers in Astronomy and Space Sciences, 2023 Modified Newtonian equations for gravitational orbits in the expanding Universe indicate that local gravitationally bounded systems like galaxies and planetary systems are unaffected by the expansion of the Universe.
Václav Vavryčuk
doaj +1 more source
Short-term dynamical evolution of grand-design spirals in barred galaxies
, 2015 We investigate the short-term dynamical evolution of stellar grand-design spiral arms in barred spiral galaxies using a three-dimensional (3D) $N$-body/hydrodynamic simulation.
Baba, Junichi
core +1 more source
The SWELLS survey - V. A Salpeter stellar initial mass function in the bulges of massive spiral galaxies [PDF]
, 2012 Recent work has suggested that the stellar initial mass function (IMF) is not universal, but rather is correlated with galaxy stellar mass, stellar velocity dispersion or morphological type.
A. Dutton +11 more
semanticscholar +1 more source
A Role for the Plastidial GPT2 Translocator in the Modulation of Lignin Biosynthesis
Plant, Cell &Environment, EarlyView.ABSTRACT Engineering plants with reduced lignin content can result in pleiotropic growth defects. In stems of Arabidopsis plants with reduced expression of hydroxycinnamoyl CoA: shikimate hydroxycinnamoyl transferase (HCT), the plastidial glucose 6‐phosphate: phosphate co‐transporter GPT2 is highly overexpressed, and this coincides with reduced lignin ...
Aditi Subramani Raju +4 more
wiley +1 more source
Magnetic-Field Vector Maps of Nearby Spiral Galaxies
Galaxies, 2019 We present a method for determining the directions of magnetic-field vectors in a spiral galaxy using two synchrotron polarization maps, an optical image, and a velocity field.
Hiroyuki Nakanishi +2 more
doaj +1 more source
A DIVERSITY OF PROGENITORS AND HISTORIES FOR ISOLATED SPIRAL GALAXIES [PDF]
, 2012 We analyze a suite of 33 cosmological simulations of the evolution of Milky-Way-mass galaxies in low-density environments. Our sample spans a broad range of Hubble types at z = 0, from nearly bulgeless disks to bulge-dominated galaxies.
M. Martig +4 more
semanticscholar +1 more source
Stellar Populations in Spiral Galaxies [PDF]
Proceedings of the International Astronomical Union, 2006 We report preliminary results of the characterization of bulge and inner disk stellar populations for 8 nearby spiral galaxies using Gemini/GMOS. The long-slit spectra extend out to 1-2 disk scale lengths with S/N/Ang > 50. Two different model fitting techniques, absorption-line indices and full spectral synthesis, are found to weigh age ...
J. Jesús González +2 more
openaire +3 more sources