Monitoring of active galactic nuclei. V. The Seyfert 1 galaxy Markarian 279

• For pt. IV see ibid., vol.284, no.1, p.33-43 (1994). Reports on the Lovers of Active Galaxies' (LAG) monitoring of the Seyfert 1 galaxy Markarian 279 from January to June 1990. The source, which was in a very bright state, gradually weakened after the first month of monitoring: the Halpha and Hbeta flux decreased by 20% and 35% respectively, and the continuum under Halpha by 30%. The luminosity-weighted radius of the broad line region (BLR), as derived from the cross-correlation function, is of the order of 10 light days. This result is very uncertain because the features in the light curves are very shallow, but it is unlikely that the radius of the BLR is more than 1 light month. The profile variations of Halpha confirm that the prevailing motions are not radial. The data of the present campaign and those obtained in previous years, when the source was in a much weaker state, show that the red asymmetry of the Balmer lines correlates positively with the broad line flux. This new effect is briefly discussed

Ämnesord

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

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

Nyckelord

Experimental/ astronomical photometry

astronomical spectra

galactic nuclei

Markarian galaxies

Seyfert galaxies

visible astronomical observations/ active galactic nuclei

AGN

Seyfert galaxy

Seyfert 1 galaxy

very bright state

Markarian 279

galactic nucleus

visible photometry

Halpha

Hbeta flux

broad line region

AD 1990

visible spectra

variability

350 to 900 nm/ A9850R Active and peculiar galaxies A9850E Galactic structure

content and morphology A9580J Photographic region astronomical observations A9850G Radiation and spectra of galaxies/ wavelength 3.5E-07 to 9.0E-07 m

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