Browsing Research publications by Title
Now showing items 19439-19458 of 22815
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The Spectral and Temporal Properties of Transient Sources in Early-type Galaxies
(2012-08-20)We report the spectral and temporal variability properties of 18 candidate transient (TC) and potential transient (PTC) sources detected in deep multi-epoch Chandra observation of the nearby elliptical galaxies, NGC3379, ... -
Spectral classification of photometrically selected AGB candidates in NGC 6822
(2015-02-02)Context. The ratio of C- and M-type asymptotic giant branch (AGB) stars is commonly used to estimate the metallicity of extragalactic populations. Sources in the AGB population must therefore be accurately classified as ... -
Spectral energy distribution and radio halo of NGC253 at low radio frequencies
(2017-03-27)We present new radio continuum observations of NGC253 from the Murchison Widefield Array at frequencies between 76 and 227 MHz. We model the broadband radio spectral energy distribution for the total flux density of NGC253 ... -
The Spectral Energy Distribution of Powerful Starburst Galaxies I : Modelling the Radio Continuum
(2018-02-01)We have acquired radio-continuum data between 70MHz and 48 GHz for a sample of 19 southern starburst galaxies at moderate redshifts (0.067 < z < 0.227) with the aim of separating synchrotron and free-free emission components. ... -
Spectral evidence for dust in late-type M dwarfs
(1997-02-13)We have found a dramatic change in the spectra of late-type M dwarfs at wavelengths shorter than 0.75 microns. Comparisons with synthetic spectra illustrate that this change is well explained by the presence of dust. It ... -
The Spectral Evolution of High-Frequency Radio Outbursts in the Blazar PKS:0420-014
(1995-08-01)Multifrequency monitoring data between 375 and 22 GHz are used to investigate spectral evolution of radio outbursts in the blazar 0420-014. It is shown that, after subtraction of the underlying `quiescent' emission, the ... -
Spectral Monitoring of HS 0209+0832 a DAB White Dwarf in the DB Gap
(Astronomical Society of the Pacific, 2001)We report results of a spectral monitoring campagne of the DAB white dwarf HS 0209+0832, for which helium line profile variations were reported earlier (Heber et al. 1997). This finding is confirmed by our discovery of a ... -
Spectral Parameters for Scattering Amplitudes in N=4 Super Yang-Mills Theory
(2014-01-17)Planar N=4 Super Yang-Mills theory appears to be a quantum integrable four-dimensional conformal theory. This has been used to find equations believed to describe its exact spectrum of anomalous dimensions. Integrability ... -
Spectral properties of X-ray binaries in Centaurus A
(2013-04-01)We present a spectral investigation of X-ray binaries (XBs) in NGC 5128 (Cen A), using six 100 ks Chandra observations taken over two months in 2007. We divide our sample into thermally and non-thermally dominated states ... -
The spectral structure and energetics of powerful radio sources
(2014-04-29)Determining the energy spectrum of an electron population can give key insights into the underlying physics of a radio source; however, the lack of high resolution, broad-bandwidth observations has left many ambiguities ... -
Spectral Structure In Fr II Radio Galaxies And Jets
(University of Chicago Press/ American Astronomical Society, 2001-11)Using spectral tomography to separate overlapping spectral features in a sample of FR II radio galaxies, we Ðnd a variety of spatial/spectral features that are not easily described in the context of current models. In ... -
Spectral surface albedo over Morocco and its impact on radiative forcing of Saharan dust
(2009-02)In May-June 2006, airborne and ground-based solar (0.3-2.2 mu m) and thermal infrared (4-42 mu m) radiation measurements have been performed in Morocco within the Saharan Mineral Dust Experiment (SAMUM). Upwelling and ... -
The spectral–temporal properties of the prompt pulses and rapid decay phase of gamma-ray bursts
(2010)The prompt emission from gamma-ray burst is the brightest electromagnetic emission known, yet its origin is not understood. The flux density of individual prompt pulses of a GRB can be represented by an analytical expression ... -
Spectrophotometric analysis of RNA
(Humana Press, 2000)