In this work we analyze a convex-programming method for estimating superpositions of point sources or spikes from nonuniform samples of their convolution with a known kernel. We consider a one-dimensional model where the kernel is either a Gaussian function or a Ricker wavelet, inspired by applications in geophysics and imaging. Our analysis establishes that minimizing a continuous counterpart ...

Many people live near point sources of air pollution such as industrial sites and waste disposal operations and there are often suggestions of clusters of disease around such activities. Such alleged clusters will generate significant public concern and media interest and in many cases will warrant detailed investigation. However, the ability of current epidemiological methods to investigate su...

We assess contribution to the X-ray (above 2 keV) luminosity of the Milky Way from different classes of low-mass binary systems and single stars. We begin by using the RXTE Slew Survey of the sky at |b| > 10 to construct an X-ray luminosity function (XLF) of nearby X-ray sources in the range 10 erg s < Lx < 10 34 erg s (where Lx is the luminosity over 2–10 keV), occupied by coronally active bin...

Experiments have shown that bacteria can be sensitive to small variations in chemoattractant (CA) concentrations. Motivated by these findings, our focus here is on a regime rarely studied in experiments: bacteria tracking point CA sources (such as food patches or even prey). In tracking point sources, the CA detected by bacteria may show very large spatiotemporal fluctuations which vary with di...

Weak gravitational lensing from large-scale structure enhances and reduces the fluxes from extragalactic point sources with an r.m.s. amplitude of order 15%. In cosmic microwave background (CMB) experiments, sources exceeding some flux threshold φc are removed, which means that lensing will modulate the brightness map of the remaining unresolved sources. Since this mean brightness is of order 1...

This paper describes the search for astronomical sources of high-energy neutrinos using the AMANDA-B10 detector, an array of 302 photomultiplier tubes, used for the detection of Cherenkov light from upward traveling neutrino-induced muons, buried deep in ice at the South Pole. The absolute pointing accuracy and angular resolution were studied by using coincident events between the AMANDA detect...

We describe the observing simulation software FISVI (FIS Virtual Instrument), which was developed for the Far-Infrared Surveyor (FIS) that will be on the Japanese infrared astronomy mission ASTRO-F. The FISVI has two purposes: one is to check the specifications and performances of the ASTRO-F/FIS as a whole, and the other is to prepare input data sets for the data analysis softwares prior to la...

We review estimates of small scale fluctuations due to extragalactic point sources in the Planck Surveyor frequency bands. While our undestanding of the spectral and evolutionary properties of these sources is far from complete, conservative estimates allow us to confidently conclude that, in the frequency range 100–200 GHz, their contaminating effect is well below the expected anisotropy level...

This paper discusses observational relations for cosmological point sources in some specific waveband, and their use in the context of the data provided by the galaxy redshift surveys. By starting from the general theory for observations in relativistic cosmology, developed mainly by G. F. R. Ellis, the equations for colour, K-correction and number counts of cosmological point sources are discu...

In this paper, we check in detail the validity of the widely adopted point source approximation for nearby cosmic-ray (CR) sources. Under an energy independent escape model for CRs from the sources, we show that for young nearby sources, the point source approximation breaks down at lower energies and the CR spectrum depends on the size and the morphology of the source. When applied to the near...