A search for electron-scattered wings in Halpha in Seyfert-1 galaxies

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

NATURVETENSKAP Fysik Astronomi, astrofysik och kosmologi hsv//swe
NATURAL SCIENCES Physical Sciences Astronomy, Astrophysics and Cosmology hsv//eng
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

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