Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aas...185.2703m&link_type=abstract
American Astronomical Society, 185th AAS Meeting, #27.02; Bulletin of the American Astronomical Society, Vol. 26, p.1356
Astronomy and Astrophysics
Astronomy
Scientific paper
We present results of a study of narrow-line region (NLR) kinematics in Seyfert nuclei. This study has involved extensive modeling which includes collimated emission, radially dependent rotation and turbulence, explicit photoionization calculations, and realistic treatments of both internal and external obscuration, and also allows for gradients in the electron density and the radial velocity of clouds throughout the NLR. Line profiles of [O II] lambda 3727, [Ne III] lambda 3869, [O III] lambda 5007, [Fe VII] lambda 6087, [O I] lambda 6300, [Fe X] lambda 6374, Hα lambda 6563, and [S II] lambda 6731 are calculated for a wide range of physical conditions throughout the NLR. The model profiles are compared with line profiles derived from data taken with the Mount Palomar 5 m Hale Telescope as well as with profiles taken from the literature. The scenario in agreement with the largest number of observational considerations, including correlations of line width with ionization potential, consists of clouds which are accelerating outward with v ~ sqrt {r} (i.e., constant force) and n_e ~ {1 / r(2}) . The clouds start out at the inner NLR radius with n_e ~ 10(6) cm(-3) and with a very large column density (10(23) - 10(24) cm(-2) ). These clouds are uniformly accelerated from a few tens of km/sec to ~ < 1,000 km/sec. When the clouds reach the outer NLR radius, they have n_e \> 10(2) cm(-3) and a column density of 10(21) - 10(22) cm(-2) . The clouds maintain an ionization parameter of about 0.3 throughout the NLR. This work has been supported by NASA grant NAG 5-1630
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