Spectroscopic monitoring of active galactic nuclei. III. Size of the broad line region in NGC 3227

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For pt.II see ibid., vol.269, no.1-2, p.39-53 (1993). The authors present the results of a five-month monitoring campaign of the active galactic nucleus in NGC 3227. The Hbeta and Halpha emission lines and the optical continuum have been analysed. The optical AGN continuum and the broad-line region (BLR) emission in NGC 3227 appear to vary by about 40% on a timescale of 1.5 month. The levels of the broad-line emission and the 675.0 nm continuum are well correlated, a fact consistent with the assumption that the BLR material is photoionised by the central continuum source. Cross-correlation analyses between the light curves of the 675.0 nm AGN continuum and the BLR H emission indicate that the lag of the BLR emission with respect to the continuum variations is 17plusmn7 days. This result suggests that the BLR clouds that are affected by the changes in the flux of the central ionising source lie about 17 light days away from it

NATURVETENSKAP Fysik Astronomi, astrofysik och kosmologi hsv//swe
NATURAL SCIENCES Physical Sciences Astronomy, Astrophysics and Cosmology hsv//eng
Experimental/ astronomical photometry
astronomical spectra
galactic nuclei
visible astronomical observations/ AGN broad line region size
spectrum variations
visible
BLR clouds galactocentric distance
emission-line spectrum
BLR size-nuclear luminosity relation
AD 1990 01 to 06
light curves cross-correlation analyses
interacting galaxy
BLR clouds photoionisation
active galactic nuclei
NGC 3227
five-month monitoring campaign
active galactic nucleus
Hbeta
emission lines
optical continuum
broad-line region
675.0 nm continuum
central continuum source
BLR H emission
continuum variations
BLR clouds
central ionising source
486.1 nm
656.3 nm
675.0 nm
45 d
10 to 24 d
17 d
440 Tm
260 to 620 Tm
23 Mpc
450 to 700 nm
1158 km/s
H emission line variations time lag/ A9850R Active and peculiar galaxies A9850E Galactic structure
content and morphology A9850G Radiation and spectra of galaxies A9580J Photographic region astronomical observations/ wavelength 4.861E-07 m
wavelength 6.563E-07 m
wavelength 6.75E-07 m
time 3.9E+06 s
time 8.6E+05 to 2.1E+06 s
time 1.5E+06 s
distance 4.4E+14 m
distance 2.6E+14 to 6.2E+14 m
galactic distance 2.3E+07 pc
wavelength 4.5E-07 to 7.0E-07 m
velocity 1.158E+06 m/s/ H/el

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