نتایج جستجو برای: مدل lmc
تعداد نتایج: 122299 فیلتر نتایج به سال:
Received ; accepted – 2 – ABSTRACT An expression is provided for the self-lensing optical depth of the thin LMC disk surrounded by a shroud of stars at larger scale heights. The formula is written in terms of the vertical velocity dispersion of the thin disk population. If tidal forcing causes ∼ 1 − 5% of the disk mass to have a height larger than 6 kpc and ∼ 10 − 15% to have a height above 3 k...
Abstract Since the hypervelocity stars were discovered in Milky Way, various mechanisms have been proposed to explain these runaway stars. Up now, however, dominant ejected mechanism of is still unclear. As largest and closest face-on satellite galaxy Large Magellanic Cloud (LMC) serves as a good target, allowing us study this issue. Based on high-precision astrometric parameters provided by Ga...
We report the discovery of two new R Coronae Borealis (RCB) stars in the Large Magellanic Cloud (LMC) using the MACHO project photometry database. The identification of both stars has been confirmed spectroscopically. One is a cool RCB star (T ef f ∼ 5000 K) characterized by very strong Swan bands of C 2 and violet bands of CN, and weak or absent Balmer lines, G-band and 12 C 13 C bands. The se...
We present results from three observations with the Rossi X-ray Timing Explorer (RXTE) of LMC X-3, obtained while the source was in an extended ’low/hard’ state. The data reveal a hard X-ray spectrum which is well fit by a pure power law with photon index Γ=1.69±0.02, with a source luminosity at 50 kpc of 5–16×1036 erg s−1 (2–10 keV). Strong broad-band (0.01-100 Hz) time variability is also obs...
We propose an observational test that can break the degeneracy of two main classes of microlensing models to the Magellanic Clouds: (a) the lenses are located in the Galactic halo, and (b) the lenses are located in the LMC disk. The source stars in the latter (self-lensing) models tend to be at the far side or behind the LMC disk, thus experience more reddening and extinction by dust in the LMC...
We first present the results of fully self-consistent numerical simulations of the Large and Small Magellanic Clouds (LMC and SMC), which show that the last collision between the Magellanic clouds about ∼ 0.2 Gyr ago can form the apparently off-center bar and peculiar HI spirals of the LMC. We also show that the present spatial distributions of young stars with ages less than ∼ 20 Myr in the LM...
A series of recent papers have claimed that intranode scattering, alone, can contribute to positive longitudinal magnetoconductance (LMC) due chiral anomaly (CA) in Weyl semimetals (WSMs). We revisit the problem CA induced LMC WSMs, and show by itself, does not result enhancement LMC. In limit zero internode charge must remain conserved, which is shown actually decrease Only presence a non-zero...
In this article, we propose an optimization algorithm for the original LMC [1] (Large Margin Classifier). We use PCA [2] (Principal Component Analysis) to reduce dimensionality of images, and then put data after reduction into optimized feature selection [3]. will get several features with greatest distinction. these classify images. Finally, experiment shows that accuracy under same dimensions...
We investigate the molecular bands in carbon-rich AGB stars in the Large Magellanic Cloud (LMC), using the InfraRed Spectrograph (IRS) on board the Spitzer Space Telescope (SST) over the 5–38 μm range. All 26 low-resolution spectra show acetylene (C2H2) bands at 7 and 14 μm. The hydrogen cyanide (HCN) bands at these wavelengths are very weak or absent. This is consistent with low nitrogen abund...
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