The narrow variable components of CIV in NGC 4151 from 1981 to 1987

Details The narrow variable components of CIV in NGC 4151 from 1981 to 1987 The narrow variable components of CIV in NGC 4151 from 1981 to 1987

Aug 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996mnras.281..907u&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 281, Issue 3, pp. 907-915.

Astronomy and Astrophysics

Astronomy

5

Galaxies: Individual: Ngc 4151, Galaxies: Jets, Galaxies: Nuclei, Galaxies: Seyfert, Ultraviolet: Galaxies

Scientific paper

The nucleus of the Seyfert 1 galaxy NGC 4151 undergoes large-amplitude variations and occasionally passes through deep minimum states lasting up to a few months. Two narrow emission lines, L_1 and L_2, variable in intensity on a time-scale of a few days were discovered during International Ultra-violet Explorer (IUE) campaigns at low states in 1981 and 1984 and were identified with components of CIV lambda1550 blueshifted and redshifted by -6100 km s^-1 and +8500 km s^-1 respectively. We re-analyse in an homogeneous fashion these data and additional unpublished data obtained with IUE in 1986 and 1987. This analysis confirms the previous results and adds to our knowledge on the longer term behaviour of L_1 and L_2. Specifically, (i) at each low state, the two lines re-appear with approximately the same intensity range and variation time-scale as in previous low states, even though in the meantime the nucleus passed through bright episodes with strong continuum and intense broad emission components. (ii) There is no detectable wavelength drift of L_1 and L_2 in 6.7 yr. The observed wavelength of L_1 remains constant at 1522.75+/-0.4 A. (iii) There are correlations between the intensity of L_1 and the intensity of L_2, and between the intensities of the two lines with the continuum flux. These correlations are strongest in 1981 and 1984. We briefly discuss various interpretations and conclude that, at present, none is satisfactory.

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