2006A&A...459...55B


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.14CEST00:18:13

2006A&A...459...55B - Astronomy and Astrophysics, volume 459, 55-69 (2006/11-3)

Size and properties of the narrow-line region in Seyfert-1 galaxies from spatially-resolved optical spectroscopy.

BENNERT N., JUNGWIERT B., KOMOSSA S., HAAS M. and CHINI R.

Abstract (from CDS):

Spatially resolved emission-line spectroscopy is a powerful tool for determining the physical conditions in the narrow-line region (NLR) of active galactic nuclei (AGNs). We recently used optical long-slit spectroscopy to study the NLRs of a sample of six Seyfert-2 galaxies. We have shown that such an approach, in comparison to the commonly used [OIII] narrow-band imaging alone, allows us to probe the size of the NLR in terms of AGN photoionisation. Moreover, several physical parameters of the NLR can be directly accessed. We here apply the same methods to study the NLR of six Seyfert-1 galaxies and compare our results to those of Seyfert-2 galaxies. We employ diagnostically valuable emission-line ratios to determine the physical properties of the NLR, including the core values and radial dependencies of density, ionisation parameter, and reddening. Tracking the radial change of emission-line ratios in diagnostic diagrams allows us to measure the transition between AGN-like and HII-like line excitation, and thus to measure the size of the NLR. In the diagnostic diagrams, we find a transition between line ratios falling in the AGN regime and those typical of HII regions in two Seyfert-1 galaxies, thereby determining the size of the NLR. The central electron temperature and ionisation parameter are, in general, higher in type-1 Seyferts than in type 2s. In almost all cases, both electron density and ionisation parameter decrease with radius and the decrease is faster in Seyfert-1 galaxies than in Sy2s. In several objects, the gaseous velocity distribution is characteristic of rotational motion in an (inclined) emission-line disk in the centre. We give estimates of the black-hole masses and discuss our findings in detail for each object.

Abstract Copyright:

Journal keyword(s): galaxies: active - galaxies: nuclei - galaxies: Seyfert

VizieR on-line data: <Available at CDS (J/A+A/459/55): table1.dat>

Simbad objects: 12

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Number of rows : 12

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NGC 526 Sy1 01 23 54.3778199024 -35 03 55.695504754   14.76 14.60 13.46   ~ 296 1
2 NGC 1386 GiP 03 36 46.238 -35 59 57.39 12.42 12.16 11.23 10.76   ~ 460 1
3 ESO 362-8 Sy2 05 11 09.098 -34 23 36.74   13.62 12.65 12.46   ~ 65 0
4 ESO 362-18 Sy2 05 19 35.8124008506 -32 39 27.923759175   13.81 13.37 12.73   ~ 195 0
5 NGC 3281 Sy2 10 31 52.086 -34 51 13.40   12.62 14.02 11.17   ~ 315 0
6 ESO 383-35 Sy1 13 35 53.7686909139 -34 17 44.139127597   13.89 13.61 8.9   ~ 1379 0
7 NGC 5643 Sy2 14 32 40.778 -44 10 28.60   11.03 13.60 9.92 10.6 ~ 452 0
8 ESO 140-43 Sy1 18 44 53.9893682398 -62 21 52.871742814   14.14 14.10 12.94 13.1 ~ 212 0
9 NGC 6860 Sy1 20 08 46.8871284892 -61 05 59.781540363   13.70 13.53 12.14   ~ 146 0
10 IC 5063 Sy2 20 52 02.329 -57 04 07.60   12.92 13.60 11.30   ~ 545 1
11 NGC 7212 Sy2 22 07 01.9866638486 +10 14 00.849716443   15.1       ~ 160 1
12 Mrk 915 Sy1 22 36 46.4986730218 -12 32 42.886396018   15.35 14.50 13.6   ~ 136 0

    Equat.    Gal    SGal    Ecl

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2020.07.14-00:18:13

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