3,837 research outputs found
Washington Photometry of the Globular Clusters in the Virgo Giant Elliptical Galaxy M86
We present a photometric study of the globular clusters (GCs) in the Virgo
giant elliptical galaxy M86 based on Washington CT1 images. The colors of the
GCs in M86 show a bimodal distribution with a blue peak at (C -T1) = 1.30 and a
red peak at (C -T1) = 1.72. The spatial distribution of the red GCs is
elongated similarly to that of the stellar halo, while that of the blue GCs is
roughly circular. The radial number density profile of the blue GCs is more
extended than that of the red GCs. The radial number density profile of the red
GCs is consistent with the surface brightness profile of the M86 stellar halo.
The GC system has a negative radial color gradient, which is mainly due to the
number ratio of the blue GCs to the red GCs increasing as galactocentric radius
increase. The bright blue GCs in the outer region of M86 show a blue tilt: the
brighter they are, the redder their mean colors get. These results are
discussed in comparison with other Virgo giant elliptical galaxies.Comment: 15 pages, 13 figures, Accepted by Journal of the Korean Astronomical
Societ
Simultaneous detection of the nonlinear restoring and excitation of a forced nonlinear oscillation: an integral approach
We address in this article, how to calculate the restoring characteristic and the excitation of a nonlinear forced oscillating system. Under the assumption that the forced nonlinear oscillator has a periodic solution with period, we constructed a system of linear equations by introducing time-dependent multipliers. The periodicity assumption helps simplify the system of linear equations. The stability and uniqueness are also presented for the inverse problem. Numerical testing is conducted to show the effectiveness of our presented methodology.Peer ReviewedPostprint (author's final draft
Towards High Performance Anodes with Fast Charge/Discharge Rate for LIB Based Electrical Vehicles
REMOTE SENSING OF WAVE DIRECTIONALITY BY TWO-DIMENSIONAL DIRECTIONAL WAVELETS: PART 1. THE DETECTION TOOLS OF DIRECTIONALITY IN SIGNALS
This paper presents the results of a study investigating methods of wave directionality based on wavelet transform. In part 1 of this paper, the theoretical background and characteristics of directional wavelet were discussed. Morlet wavelet and Cauchy wavelet were examined to test their efficiency in detection of directionality in signals. These wavelets were tested on numerical images which were considered to describe the basic characteristics of directionality of ocean waves
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