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A search for electr...
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van Groningen, Ernst
(author)
A search for electron-scattered wings in Halpha in Seyfert-1 galaxies
- Article/chapterEnglish1989
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LIBRIS-ID:oai:DiVA.org:uu-197179
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https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-197179URI
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Language:English
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Summary in:English
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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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In:Astronomy and Astrophysics211:2, s. 318-3233230004-63611432-0746
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