نتایج جستجو برای: astronomical spectrum
تعداد نتایج: 230930 فیلتر نتایج به سال:
چکیده ندارد.
We present a novel approach to studying the diversity of galaxies. It is based on a novel spectral graph technique, that of locally-biased semi-supervised eigenvectors. Our method introduces new coordinates that summarize an entire spectrum, similar to but going well beyond the widely used Principal Component Analysis (PCA). Unlike PCA, however, this technique does not assume that the Euclidean...
The natural output of imaging spectroscopy in astronomy is a 3D data cube with two spatial and one frequency axis. The spectrum of each image pixel consists of an emission line which is Doppler-shifted by gas motions along the line of sight. These data are essential to understand the gas distribution and kinematics of the astronomical object. We propose a two-step method to extract coherent kin...
Astronomical images in the Poisson regime are typically characterized by a spatially varying cosmic background, large variety of source morphologies and intensities, data incompleteness, steep gradients in the data, and few photon counts per pixel. The Background-Source separation technique is developed with the aim to detect faint and extended sources in astronomical images characterized by Po...
PALM-3000 is proposed to be the first visible-light sodium laser guide star astronomical adaptive optics system. Deployed as a multi-user shared facility on the 5.1 meter Hale Telescope at Palomar Mountain, this state-of-the-art upgrade to the successful Palomar Adaptive Optics System will have the unique capability to open the visible light spectrum to diffraction-limited scientific access fro...
Since the original laboratory detection of an H3 + spectrum 20 years ago, the search has been on for astronomical observations of this important and fundamental molecular ion. Successful detection of H3 + in gas-giant planets, supernova ejecta and the interstellar medium as well as the prospects for future observations are discussed. The role H3 + has in determining the atmospheric structure of...
Radio astronomy is the study of celestial objects through analysis of radio waves. This field allows scientists to observe astronomical phenomena that are often undetectable in other portions of the electromagnetic spectrum. In its brief 70-year history, radio astronomy has revealed new types of celestial objects, including pulsars and quasars, and notably, cosmic microwave background radiation...
Bulk of various astronomical observations black holes suggest that virtually all observed can be primordial origin. A modified mechanism the hole formation is described. universal log-normal mass spectrum with a mean around $$ \sim 10{{M}_{ \odot }}$$ predicted by this strongly confirmed LIGO/Virgo gravitational waves from coalescing binary holes.
In this proposed thesis, I will develop efficient non-parametric methods for parameter estimation in large databases of high-dimensional, noisy data. Specifically, I plan to continue exploring the efficacy of the diffusion map method of data transformation, used in conjunction with the Nyström extension, in uncovering underlying structure in complicated, high-dimensional data sets. I will explo...
Multiwavelength Observations of the Powerful γ-ray Quasar PKS 1510−089: Clues on the Jet Composition
We present the results from a multiwavelength campaign conducted in August 2006 of the powerful γ-ray quasar PKS 1510−089 (z = 0.361). This campaign commenced with a deep Suzaku observation lasting three days for a total exposure time of 120 ks, and continued with Swift monitoring over 18 days. Besides Swift observations, which sampled the optical/UV flux in all 6 UVOT filters as well as the X-...
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