Results 51 to 60 of about 417,027 (232)
Towards a more realistic population of bright spiral galaxies in cosmological simulations [PDF]
, 2013 We present an update to the multiphase SPH galaxy formation code by Scannapieco et al. We include a more elaborate treatment of the production of metals, cooling rates based on individual element abundances, and a scheme for the turbulent diffusion of ...
M. Aumer +3 more
semanticscholar +1 more source
Exploring the evolution of spiral galaxies [PDF]
Monthly Notices of the Royal Astronomical Society, 2002 We have constructed a family of simple models for spiral galaxy evolution to allow us to investigate observational trends in star formation history with galaxy parameters. The models are used to generate broad band colours from which ages and metallicities are derived in the same way as the data.
Eric F. Bell +2 more
openaire +3 more sources
SPARC: MASS MODELS FOR 175 DISK GALAXIES WITH SPITZER PHOTOMETRY AND ACCURATE ROTATION CURVES [PDF]
, 2016 We introduce SPARC (Spitzer Photometry and Accurate Rotation Curves): a sample of 175 nearby galaxies with new surface photometry at 3.6 μm and high-quality rotation curves from previous H i/Hα studies.
F. Lelli, S. McGaugh, J. Schombert
semanticscholar +1 more source
Dark Matter in Spiral Galaxies [PDF]
Symposium - International Astronomical Union, 1995 In this review I will concentrate on three questions concerning the issue of dark matter in spiral galaxies. In the first place (and for the most part) I will discuss the analysis of rotation curves and the question whether the “maximum–disk hypothesis” is valid.
openaire +5 more sources
ON THE FRACTION OF BARRED SPIRAL GALAXIES [PDF]
The Astrophysical Journal, 2010 We investigate the stellar masses of strongly barred spiral galaxies. Our analysis is based on a sample of ~14000 visually-classified nearby galaxies given in Nair & Abraham 2010(a). The fraction of barred spiral galaxies is found to be a strong function of stellar mass and star formation history, with a minimum near the characteristic mass at ...
Preethi Nair, Roberto Abraham
openaire +4 more sources
The different star formation histories of blue and red spiral and elliptical galaxies [PDF]
, 2013 We study the spectral properties of intermediate mass galaxies (M* ∼ 1010.7 M⊙) as a function of colour and morphology. We use Galaxy Zoo to define three morphological classes of galaxies, namely early types (ellipticals), late-type (disc-dominated) face-
R. Tojeiro +8 more
semanticscholar +1 more source
Magnetic fields in spiral galaxies [PDF]
The Astronomy and Astrophysics Review, 1990 Published in A&ARev (2016) 24 ...
openaire +5 more sources
Scaling Relations of Spiral Galaxies [PDF]
The Astrophysical Journal, 2007 We construct a large data set of global structural parameters for 1300 field and cluster spiral galaxies and explore the joint distribution of luminosity L, optical rotation velocity V, and disk size R at I- and 2MASS K-bands. The I- and K-band velocity-luminosity (VL) relations have log-slopes of 0.29 and 0.27, respectively with sigma_ln(VL)~0.13, and
Courteau, Stéphane +6 more
openaire +5 more sources
The Stochastic‐Dissipative Störmer Problem‐Trajectories and Radiation Patterns
Annalen der Physik, EarlyView.We consider charged particle motion and radiation in a dipole magnetic field, in the presence of friction and of stochastic forces. The numerical solutions of the Langevin equation reveal how these forces modify the complex dynamics of particles, and they offer some new insights into the nonlinear processes relevant to planetary radiation belts ...
Tiberiu Harko, Gabriela Raluca Mocanu
wiley +1 more source
SELF-PERPETUATING SPIRAL ARMS IN DISK GALAXIES [PDF]
, 2012 The causes of spiral structure in galaxies remain uncertain. Leaving aside the grand bisymmetric spirals with their own well-known complications, here we consider the possibility that multi-armed spiral features originate from density inhomogeneities ...
E. D’Onghia +2 more
semanticscholar +1 more source