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A search for electron-scattered wings in Halpha in Seyfert-1 galaxies
1989 (English)In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 211, no 2, 318-323323 p.Article in journal (Refereed) Published
Abstract [en]

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

Place, publisher, year, edition, pages
1989. Vol. 211, no 2, 318-323323 p.
Keyword [en]
Experimental/ astronomical spectra, hydrogen neutral atoms, interstellar matter, Seyfert galaxies, visible astronomical observations/ visible, electron-scattered wings, Halpha, Seyfert-1 galaxies, ultra-broad wings, hot intercloud medium, spectra, optical depth, 7E7 K, 530 to 875 nm, H/ A9850R Active and peculiar galaxies A9840B Interstellar matter/ temperature 7.0E+07 K, wavelength 5.3E-07 to 8.75E-07 m/ H/el
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:uu:diva-197179ISI: 3381361OAI: oai:DiVA.org:uu-197179DiVA: diva2:611947
Available from: 2013-03-19 Created: 2013-03-18 Last updated: 2017-12-06Bibliographically approved

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van Groningen, Ernst

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