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  • Astronomy  (2)
  • phase diagram  (2)
  • 2000-2004  (4)
  • 1
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    Arakelian 564: An XMM-Newton View (2003)
    In:  CASI
    Details
    Publication Date: 2019-07-10
    Description: We report on two XMM-Newton observations of the bright narrow-line Seyfert 1 galaxy Ark 564 taken one year apart (2000 June and 2001 June). The 0.6-10 keV continuum is well described by a soft blackbody component (kTau approximately equal 140-150 eV) plus a steep power law (Tau approximately equal to 2.50-2.55). No significant spectral changes are observed between the two observations, although the X-ray flux in the second observation is approximately equal to 40-50 per cent lower. In both observations we detect a significant absorption edge at a rest-frame energy of approximately equal to 0.73 keV, corresponding to O VII. The presence of the absorption feature is confirmed by a simultaneous Chandra grating observation in 2000 June, although the best-fitting edge threshold is at a slightly lower energy in the Chandra data, possibly because of a different parameterization of the underlying X-ray continuum. We find tentative evidence for a broad iron emission line in the 2000 June observation. The results from an analysis of the power spectral density (PSD) function are also presented. The present XMM-Newton data support the idea that the PSD shown two breads, although the location of the high-frequency break requires further constraints.
    Keywords: Astronomy
    Type: astro-ph/0310278
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Complex Resonance Absorption Structure in the X-Ray Spectrum of IRAS 13349+2438 (2000)
    In:  CASI
    Details
    Publication Date: 2019-07-10
    Description: The luminous infrared-loud quasar IRAS 13349+2438 was observed with the XMM - Newton Observatory as part of the Performance Verification program. The spectrum obtained by the Reflection Grating Spectrometer (RGS) exhibits broad (FWHM - 1400 km/s) absorption lines from highly ionized elements including hydrogen- and helium-like carbon, nitrogen, oxygen, and neon, and several iron L - shell ions (Fe XVII - XX). Also shown in the spectrum is the first astrophysical detection of a broad absorption feature around lambda = 16 - 17 A identified as an unresolved transition array (UTA) of 2p - 3d inner-shell absorption by iron M-shell ions in a much cooler medium; a feature that might be misidentified as an O VII edge when observed with moderate resolution spectrometers. No absorption edges are clearly detected in the spectrum. We demonstrate that the RGS spectrum of IRAS 13349+2438 exhibits absorption lines from two distinct regions, one of which is tentatively associated with the medium that produces the optical/UV reddening.
    Keywords: Astronomy
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
    Electronic Resource
    Electronic Resource
    Diagramme Polythermique du Systeme Ternaire NaCl-FeCl2-H2O entre 0 et 70°C (2000)
    Springer
    Journal of thermal analysis and calorimetry 61 (2000), S. 157-164 
    Details
    ISSN: 1572-8943
    Keywords: ferrous chloride ; phase diagram ; sodium chloride ; ternary system
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The phase diagram of ternary system Na+ , Fe2+ /Cl− -H2 O was established over the temperature range 0–70°C by conductimetric and analytical methods. A solubility polytherm of the system was constructed. For each temperature, we have determined the nature of the solid phase in equilibrium with the solution and the limit of its area of existence.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1010125010896
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  • 4
    Electronic Resource
    Electronic Resource
    Diagramme Polythermique Du Systeme Ternaire KCl–FeCl2–H2O Entre 0 Et 70°C (2000)
    Springer
    Journal of thermal analysis and calorimetry 59 (2000), S. 893-900 
    Details
    ISSN: 1572-8943
    Keywords: FeCl2 ; phase diagram ; potassium chloride ; ternary system
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Polytherm diagram of the ternary system KCl–FeCl2 –H2 O between 0 and 70°C. Phase equilibria in the KCl–FeCl2 –H2 O system were studied over the temperature range 0–70°C by conductimetric and analytical methods. A solubility polytherm of the system was constructed. We have observed the crystallization fields of the KCl and FeCl2 6H2 O (at 0°C), KCl and FeCl2 4H2 O (at 15, 30 and 40°C) and KCl, FeCl2 4H2 O and of a double salt KClFeCl2 2H2 O are obtained at 70°C.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1010178426237
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