Access to Astronomical Catalogues

← Click to display the menu
J/A+A/459/55    Narrow-band imaging of 5 Seyfert-1 galaxies     (Bennert+, 2006)

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., Chini R. <Astron. Astrophys. 459, 55 (2006)> =2006A&A...459...55B
ADC_Keywords: Galaxies, Seyfert ; Active gal. nuclei ; Photometry, narrow-band Keywords: galaxies: active - galaxies: nuclei - galaxies: Seyfert Abstract: Spatially resolved emission-line spectroscopy is a powerful tool to determine 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 we are able 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 for HII regions in two Seyfert-1 galaxies, thus 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. In general, the decrease is faster in Seyfert-1 galaxies than in type 2s. In several objects, the gaseous velocity distribution is characteristic for rotational motion in an (inclined) emission-line disk in the centre. We give estimates of the black hole masses. We discuss our findings in detail for each object. Description: Observed and reddening-corrected emission-line ratios relative to Hβ are presented as a function of distance from the nucleus. The uncertainties are in the range of ∼1-15%. Objects: ---------------------------------------------------------- RA (2000) DE Designation(s) ---------------------------------------------------------- 18 44 54.0 -62 21 53 FRL 51 = ESO 140- 43 05 19 35.6 -32 39 30 MCG-05-13-017 = ESO 362- 18 22 36 46.5 -12 32 43 Mrk 915 = MCG-02-57-023 01 23 54.2 -35 03 55 NGC 526A = ESO 352- 66 20 08 46.1 -61 05 55 NGC 6860 = ESO 143- 9 ---------------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 95 75 Observed and reddening-corrected emission-line ratios relative to Hbeta for 5 galaxies
See also: J/A+A/456/953 : Narrow-band imaging of 6 Seyfert-2 galaxies (Bennert+, 2006) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 13 A13 --- Name Galaxy name 15- 20 F6.2 arcsec r Distance from center (1) 22- 26 F5.2 --- OIIobs ? Observed line-ratio [OII] 3727 to Hbeta 28- 32 F5.2 --- OIIder ? Reddening-corrected line-ratio [OIII] 3727 to Hbeta 34- 38 F5.2 --- OIIIobs Observed line-ratio [OIII] 5007 to Hbeta 40- 44 F5.2 --- OIIIder Reddening-corrected line-ratio [OIII] 5007 to Hbeta 46- 49 F4.2 --- OIobs ?=- Observed line-ratio [OI] 6300 to Hbeta 51- 54 F4.2 --- OIder ?=- Reddening-corrected line-ratio [OI] 6300 to Hbeta 56- 59 F4.2 --- HAobs Observed line-ratio Halpha to Hbeta 61- 64 F4.2 --- HAder Reddening-corrected line-ratio Halpha to Hbeta 66- 70 F5.2 --- NIIobs Observed line-ratio [NII] 6583 to Hbeta 72- 75 F4.2 --- NIIder Reddening-corrected line-ratio [NII] 6583 to Hbeta 77- 80 F4.2 --- SII1obs ?=- Observed line-ratio [SII] 6716 to Hbeta 82- 85 F4.2 --- SII1der ?=- Reddening-corrected line-ratio [SII] 6716 to Hbeta 87- 90 F4.2 --- SII2obs ?=- Observed line-ratio [SII] 6731 to Hbeta 92- 95 F4.2 --- SII2der ?=- Reddening-corrected line-ratio [SII] 6731 to Hbeta
Note (1): Negative values correspond to spectra to the southeast of the center, positive values correspond to spectra to the northwest.
Acknowledgements: Nicola Benner, nicola.bennert(at) References: Bennert et al., NGC 1386, 2006A&A...446..919B
(End) Patricia Vannier [CDS] 16-Jun-2006
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

catalogue service