نتایج جستجو برای: x ray spectrograph
تعداد نتایج: 667381 فیلتر نتایج به سال:
We present results from a study of 2–8 keV X-ray sources detected by the Advanced CCD Imaging Spectrometer (ACIS) instrument on the Chandra X-ray Observatory in the field of the z = 0.516 cluster CRSS J0030.5+2618. In our 63.5 arcmin2 search area, we detect 10 sources with 2–8 keV fluxes down to ≈ 4× 10−15 erg cm−2 s−1; our lowest flux sources are ≈ 10 times fainter than those previously availa...
An approach is presented to experimentally constrain previously unreachable (p, γ) reaction rates on nuclei far from stability in the astrophysical rp process. Energies of all critical resonances in the (57)Cu(p,γ)(58)Zn reaction are deduced by populating states in (58)Zn with a (d, n) reaction in inverse kinematics at 75 MeV/u, and detecting γ-ray-recoil coincidences with the state-of-the-art ...
X-shooter is a new high-efficiency spectrograph observing the complete spectral range of 300-2500 nm in a single exposure, with a spectral resolving power R>5000. The instrument will be located at the Cassegrain focus of one of the VLT UTs and consists of three spectrographs: UV, VIS and Near-IR. This paper addresses the design, hardware realization and performance of the Near-IR spectrograph o...
Wi th the advancemen t of descriptive cytology brought about by electron microscopy, there has arisen a need for cytochemical methods at h igh resolution. T he method of x-ray scanning microanalysis has already found numerous applications in the field of meta l lography (1-3), and may also be extended to the study of biological specimens. Recently, Yasuzumi et al. (4) have succeeded in showing ...
We present the UV spectroscopy and timing of three nearby pulsars (Vela, B0656+14 and Geminga) recently observed with the Space Telescope Imaging Spectrograph. We also review the optical and X-ray properties of these pulsars and establish their connection with the UV properties. We show that the multiwavelengths properties of neutron stars (NSs) vary significantly within the sample of middle-ag...
soil samples were collected from seven sites in and around the metropolitan area of mexicocity. the locations were chosen as possible sources of fugitive dusts which contribute to suspended particulate matter in the atmosphere of mexico city. x-ray fluorescence (xrf) was used to determine the concentrations of several major elements (si, k, ca, ti, mn, and fe), as well as of other trace element...
background: panoramic imaging is one of the most common imaging methods in dentistry. regarding the side-effects of ionizing radiation, it is necessary to survey different aspects and details of panoramic imaging. in this study, we compared the absorbed x-ray dose around two panoramic x-ray units: pm 2002 cc proline (planmeca, helsinki, finland) and cranex tome (soredex, helsinki, finland). mat...
Forbidden neon emission from jets of low-mass young stars can be used to probe the underlying highenergy processes in these systems. We analyze spectra of the jet of DG Tau obtained with the Very Large Telescope/X-Shooter spectrograph in 2010. [Ne iii] λ3869 is clearly detected in the innermost 3 microjet and the outer knot located at ∼ 6. 5. The velocity structure of the inner microjet can be ...
We update the light curves from the X-ray, optical, and radio bandpasses which we have assembled over the past decade, and present two observations in the ultraviolet using the Hubble Space Telescope Faint Object Spectrograph. The HRI X-ray light curve is constant within the errors over the entire observation period. This behavior is confirmed in the ASCA GIS data obtained in 1993 and 1995. In ...
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