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Rapid Variations in the Seyfert 1 Galaxy Mrk 474

Published online by Cambridge University Press:  12 April 2016

R. R. Valiullin
R. R. Valiullin*
Affiliation:
Fesenkov Astrophysical Institute, Kamenskoye Plato, Almaty, 480020, Kazakhstan. Electronic mail: rashit@afi.south-capital.kz

Abstract

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Spectra of Mrk 474 have been obtained in order to search for short-term (less than one day) variability in the broad Hβ and Hα profiles. Observations were carried out using a slit spectrograph and a three-cascade image tube attached to the 70-cm reflector. The processing of the series of spectrograms, obtained on 1999 April 25, showed a rapid (less than 20 minutes) and powerful increase of the flux in the region of [O III]λ5007. The increase of the flux near maximum (5060Å ± 10Å)appeared to be equal approximately to 300%. The value similar to the FWHM for the long-wavelength excess of the flux was equal to 170Å ± 20Å. The dying-out of the long-wavelength excess lasted approximately two hours.

Type
Part 5. AGN Phenomena
Information
International Astronomical Union Colloquium , Volume 184: AGN Surveys , 2002 , pp. 375 - 376
Copyright
Copyright © Astronomical Society of the Pacific 2002

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