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

Ämnesord

NATURVETENSKAP  -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)

NATURAL SCIENCES  -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)

Nyckelord

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

Publikations- och innehållstyp

ref (ämneskategori)

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