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Imaging of star clusters in unperturbed spiral galaxies with the Advanced Camera for Surveys. II. A comparison of star cluster systems in five late type spirals
(2009)
Aims. Our goal is to investigate the formation of star clusters in relatively unperturbed environments. To do this, we studied the five nearby spiral galaxies: NGC 45, NGC 1313, NGC 4395, NGC 5236, and NGC 7793. Methods. ...
Dusty spirals triggered by shadows in transition discs
(EDP Sciences, 2019)
Context. Despite the recent discovery of spiral-shaped features in protoplanetary discs in the near-infrared and millimetre wavelengths, there is still an active discussion to understand how they formed. In fact, the spiral ...
Comment on: “Harmonic oscillator in an elastic medium with a spiral dislocation”
(Elsevier, 2020-01-15)
We analyze recently derived eigenvalues of the Schrödinger equation for a harmonic oscillator in the presence of a spiral dislocation. We show that in the case of confinement those results do not take into account the limit ...
Design of high return loss logarithmic spiral antenna
(John Wiley & Sons Inc, 2017-10)
We propose a new strategy for designing a logarithmic spiral antenna and the impedance adapter to operate in a frequency range of 1 to 10 GHz. Numerical and experimental results show a decrease in return loss being higher ...
Spiral waves triggered by shadows in transition disks
(IOP Publishing, 2016)
Circumstellar asymmetries such as central warps have recently been shown to cast shadows on outer disks. We investigate the hydrodynamical consequences of such variable illumination on the outer regions of a transition ...
MEASUREMENT OF GALACTIC LOGARITHMIC SPIRAL ARM PITCH ANGLE USING TWO-DIMENSIONAL FAST FOURIER TRANSFORM DECOMPOSITION
(The Astrophysical Journal Supplement Series, 2012)