For the population of QSOs with broad ultraviolet absorption lines, we are just beginning to accumulate X-ray observations with enough counts for spectral analysis at CCD resolution. From a sample of eight QSOs [including four Broad Absorption Line (BAL) QSOs and three mini-BAL QSOs] with ASCA or Chandra spectra with more than 200 counts, general patterns are emerging. Their power-law X-ray con...

Siegbahn, London: Humphrey Milford, 1925. "The Fine Structure of Certain X-Ray Absorption Edges," K. Chamberlain, P. R., 26, 525, 1925. "Utber die K-Rontgenabsorptionsspektra der Elements Si, Ti, V, Cr, Mn and Fe," A. E. Lindh, Zeit. Phys., 31, 210, 1925. "Dissertation," A. E. Lindh, Lund, 1925. 1926. "tber das L-Rontgenabsorptionsspektrum von Antimon," A. Jonsson, Zeit. Phys., 35, 387, 1926. "...

The local order around Mn atoms in the Mn-implanted Si samples, with ferromagnetic properties, has been investigated by use of x-ray-absorption spectroscopy techniques. Analysis of both extended x-ray-absorption fine structure and x-ray absorption near-edge structure spectra clearly indicates that Mn ions are located neither in the substitutional nor in the interstitial position in the Si latti...

Recently, with the Chandra X-ray Telescope we have detected several local X-ray absorption lines along lines-of-sight towards distant quasars. These absorption lines are produced by warm/hot gas located in local intergalactic space and/or in our Galaxy. I will present our observations and discuss the origin of the X-ray absorption and its implications in probing the warm/hot component of local ...

We present the results of X-ray spectroscopic observations with XMM-Newton for four high-redshift radio-loud quasars at z > 4. Among these, three objects, namely, GBB1508+5714, PMNJ0324-2918, and PKSB1251-407 do not show soft X-ray spectral flattening; the derived upper limits on assumed intrinsic absorption are (3.3 − 17.3) × 10 cm, the least of which is among the most stringent limits for z >...

Observations of the C iv and Mg ii absorption lines in the Seyfert 1 galaxy NGC 4151 obtained with the GHRS in October 1994 are presented. The data from the STScI archive show multiple broad and narrow components in both species. In addition to Galactic absorption, four narrow and four broad systems associated with NGC 4151 are identified. Two broad systems dominate the total equivalent width, ...

BACKGROUND Phase-contrast x-ray imaging using an x-ray interferometer has great potential to reveal the structures inside soft tissues, because the sensitivity of this method to hydrogen, carbon, nitrogen, and oxygen is approximately 1000 times higher than that of the absorption-contrast x-ray method. Imaging of vessels is very important to understand the vascular distribution of organs and tum...

In a survey of the UV-brightest AGN using the Far Ultraviolet Spectroscopic Explorer (FUSE), we commonly find associated absorption in the O vi λλ1032, 1038 resonance doublet. Of 34 Type I AGN observed to date with z < 0.15, 16 show detectable O vi absorption. Most absorption systems show multiple components with intrinsic widths of ∼ 100 km s spread over a blue-shifted velocity range of < 1000...