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Sökning: WFRF:(van Groningen Ernst) > Naturvetenskap

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1.
  • van Groningen, Ernst, et al. (författare)
  • A search for electron-scattered wings in Halpha in Seyfert-1 galaxies
  • 1989
  • Ingår i: Astronomy and Astrophysics. - 0004-6361 .- 1432-0746. ; 211:2, s. 318-323323
  • Tidskriftsartikel (refereegranskat)abstract
    • Spectra were obtained of a dozen bright Seyfert-1 galaxies to search for the presence of ultra-broad wings in Halpha, caused by electron scattering in the hypothetical hot intercloud medium. The spectra, which covered the wavelength range from 5300 Aring to 8750 Aring, were carefully calibrated to obtain the accurate continuum shape. In no case were ultra-broad wings of the type expected from electron scattering found, although significantly broader wings are detected than in previous data. Synthesized spectra were used to estimate the sensitivity of the survey for electron scattered wings. The results can be converted into a lower limit on the temperature of 7times10 7 K, and an upper limit of 0.15 on the electron scattering optical depth
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4.
  • Ronnback, Jari, et al. (författare)
  • Host galaxies of intermediate redshift radio-loud and radio-quiet quasars
  • 1996
  • Ingår i: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY. - : BLACKWELL SCIENCE LTD. - 0035-8711. ; 283:1, s. 282-296
  • Tidskriftsartikel (refereegranskat)abstract
    • In a search for host galaxies associated with quasars, we present results from deep CCD imaging using the European Southern Observatory (ESO) 3.5-m New Technology Telescope (NTT). 21 targets, 12 radio-loud and nine radio-quiet quasars, were observed in R,
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5.
  • van Groningen, Ernst (författare)
  • Further evidence for Raman scattering in RR Tel
  • 1993
  • Ingår i: Monthly notices of the Royal Astronomical Society. - 0035-8711 .- 1365-2966. ; 264:4, s. 975-979979
  • Tidskriftsartikel (refereegranskat)abstract
    • Raman scattering of O VIlambdalambda13O2, 1308 photons on the ground level of neutral hydrogen has been suggested as the cause of the broad emission features at 6825 and 7088 Aring in the spectra of symbiotic stars. The authors report on the detection of other Raman lines in the optical spectrum of the symbiotic star RR Tel. The lines detected are two He II Balmer lines that are Raman-scattered to wavelengths close to hydrogen Hbeta and Hgamma. Another possible detection is scattered C III lambda977, which appears at about 4977 Aring in the optical spectrum
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  • Resultat 1-6 av 6

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