Absorption line variability in Markarian 231

Details Absorption line variability in Markarian 231 Absorption line variability in Markarian 231

Oct 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...264l...5k&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 264, no. 1, p. L5-L8.

Astronomy and Astrophysics

Astrophysics

15

Absorption Spectra, Markarian Galaxies, Seyfert Galaxies, Light Curve, Red Shift, Sodium

Scientific paper

We present optical spectra of Mkn231 for three different epochs. Through comparison with spectra from the literature of the last 15 years, we have determined a variability lightcurve for one of the three nonstellar NaD absorption components, namely the one having the highest relative velocity of 8000 km/s with respect to the systemic velocity. The other NaD absorption components and the continuum flux remained constant during the last 10 years. The amplitude of the variable absorption component shows a FWHM of 2500 days. From this value we derive an upper limit of 8 light days for the extension of the central continuum source in Mkn231 or a lifetime of 10 years for the varying absorption line cloud.

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