scholarly journals Spectrophotometry of Selected AGN Seyfert Galaxy AKN 564

1999 ◽  
Vol 194 ◽  
pp. 87-89
Author(s):  
L.S. Slavcheva ◽  
B.M. Mihov ◽  
G.T. Petrov ◽  
R.S. Bachev
Keyword(s):  
Electron Temperature ◽  
Electron Density ◽  
Seyfert Galaxy ◽  
Emission Lines ◽  
Narrow Line ◽  
Line Region ◽  
The Galaxy ◽  
Narrow Line Region ◽  
Image Position ◽  
Typical Temperature

Akn 564 (α1950 = 22h40m18.3s, δ1950 = 29°27′47″) is a Sy1.5G SBb type galaxy. According to Zwicky (1966) it has a photographic magnitude mp = 14.4 and a redshift of 0.025. The spectra of the galaxy were obtained at the 2.6-m telescope of the Crimean Astrophysical Observatory with a spectrograph having a dispersion of 100 A mm−1. They were processed with the help of SPEC and LONG packages integrated in MIDAS. As a result of the spectrophotometry we obtain the fluxes at λλ 4363, 4959, 5007 A: I(4363), I(4959), I(5007). The spectrum of the galaxy in λλ 4000–7000 is shown in Figure 1. We use the relation of the fluxes of those narrow forbidden emission lines: sensitive at a greater extent to the electron temperature Te than to the electron density ne. The value of R = 74.3 we got, having a typical value of ne = 5×105 cm−3 for the NLR (Narrow Line Region), leads to the estimation of a typical temperature of Te = 104 K.

scholarly journals Origin of the Gas in the Extended Narrow-Line Region of Nearby Seyfert Galaxies: The Case of Mrk 6

2009 ◽  
Vol 5 (S267) ◽  
pp. 327-327
Author(s):  
V. Cracco ◽  
S. Ciroi ◽  
F. Di Mille ◽  
L. Vaona ◽  
P. Rafanelli ◽  
...  
Keyword(s):  
Seyfert Galaxy ◽  
Seyfert Galaxies ◽  
Special Astrophysical Observatory ◽  
Narrow Line ◽  
Physical Processes ◽  
Ionized Gas ◽  
Preliminary Results ◽  
Line Region ◽  
Narrow Line Region ◽  
Open Question

AbstractIonization cones are one of the most important pieces of evidence supporting the AGN unified model (Antonucci & Miller 1985; Urry & Padovani 1995). Until now, the physical processes at work in the cones are not completely understood. A still open question concerns the origin of the gas. To study the origin of the ionized gas, we first selected a sample of nearby (z<0.03) Seyfert galaxies showing extended [O iii] λ5007 emission. We then observed these galaxies with the MultiPupil Fiber Spectrograph (MPFS) at the 6-m telescope of the Special Astrophysical Observatory (Russia). Here we present very preliminary results on the properties of the narrow-line region (NLR) of the intermediate Seyfert galaxy Mrk 6.

Subaru High-Dispersion Spectroscopy of the Narrow-Line Region in the Seyfert Galaxy NGC 4151

2003 ◽  
Vol 126 (3) ◽  
pp. 1167-1182 ◽  
Author(s):  
Tohru Nagao ◽  
Takashi Murayama ◽  
Yasuhiro Shioya ◽  
Yoshiaki Taniguchi
Keyword(s):  
Seyfert Galaxy ◽  
High Dispersion ◽  
Narrow Line ◽  
Ngc 4151 ◽  
Line Region ◽  
Narrow Line Region

scholarly journals Composite Models for Narrow Line Regions

1994 ◽  
Vol 159 ◽  
pp. 449-449
Author(s):  
Stefanie Komossa
Keyword(s):  
Seyfert Galaxies ◽  
Emission Lines ◽  
Physical Parameters ◽  
Narrow Line ◽  
Excitation Mechanism ◽  
Line Region ◽  
Composite Models ◽  
Fixed Radius ◽  
Narrow Line Region ◽  
Ionization Parameter

The basic excitation mechanism for the emission lines of Seyfert galaxies is generally believed to be photoionization by radiation emerging from the central power source. In order to deduce the essential physical parameters appropriate to the narrow line region (NLR) on this basis and to overcome some systematic deficiencies of existing photoionization models, we drop the frequent assumption of a constant ionization parameter throughout the NLR and, in particular, allow for a range of densities at fixed radius. We predict all observed emission-lines (ranging from CIV λ1549 in the UV- to [SIII]λ9069 in the NIR spectral region) for the sample of Sy 2 galaxies using the code CLOUDY (Ferland 1993).

scholarly journals Mapping the Kinematics of the Narrow-Line Region in the Seyfert Galaxy NGC 4151

2005 ◽  
Vol 130 (3) ◽  
pp. 945-956 ◽  
Author(s):  
V. Das ◽  
D. M. Crenshaw ◽  
J. B. Hutchings ◽  
R. P. Deo ◽  
S. B. Kraemer ◽  
...  
Keyword(s):  
Seyfert Galaxy ◽  
Narrow Line ◽  
Ngc 4151 ◽  
Line Region ◽  
Narrow Line Region

scholarly journals The Narrow Line Region in 3D: mapping AGN feeding and feedback

2014 ◽  
Vol 10 (S309) ◽  
pp. 190-195 ◽  
Author(s):  
Thaisa Storchi Bergmann
Keyword(s):  
Seyfert Galaxies ◽  
Molecular Gas ◽  
Narrow Line ◽  
Ionized Gas ◽  
Gas Kinematics ◽  
Integral Field Spectroscopy ◽  
Line Region ◽  
The Galaxy ◽  
Mass Outflow ◽  
Narrow Line Region

AbstractEarly studies of nearby Seyfert galaxies have led to the picture that the Narrow Line Region is a cone-shaped region of gas ionized by radiation from a nuclear source collimated by a dusty torus, where the gas is in outflow. In this contribution, I discuss a 3D view of the NLR obtained via Integral Field Spectroscopy, showing that: (1) although the region of highest emission is elongated (and in some cases cone-shaped), there is also lower level emission beyond the “ionization cone”, indicating that the AGN radiation leaks through the torus; (2) besides outflows, the gas kinematics include also rotation in the galaxy plane and inflows; (3) in many cases the outflows are compact and restricted to the inner few 100pc; we argue that these may be early stages of an outflow that will evolve to an open-ended, cone-like one. Inflows are observed in ionized gas in LINERs, and in warm molecular gas in more luminous AGN, being usually found on hundred of pc scales. Mass outflow rates in ionized gas are of the order of a few M⊙ yr−1, while the mass inflow rates are of the order of tenths of M⊙ yr−1. Mass inflow rates in warm molecular gas are ≈ 4–5 orders of magnitude lower, but these inflows seem to be only tracers of more massive inflows in cold molecular gas that should be observable at mm wavelengths.

On the origin of the Z-shaped narrow-line region in the Seyfert galaxy NGC 3516

1993 ◽  
Vol 105 ◽  
pp. 1318 ◽  
Author(s):  
Sylvain Veilleux ◽  
R. B. Tully ◽  
Jonathan Bland-Hawthorn
Keyword(s):  
Seyfert Galaxy ◽  
Narrow Line ◽  
Line Region ◽  
Narrow Line Region

scholarly journals Unusual Radio Structures in Markarian 6

1996 ◽  
Vol 175 ◽  
pp. 177-178
Author(s):  
M.J. Kukula ◽  
A. Pedlar ◽  
S.A. Baum ◽  
A.J. Holloway
Keyword(s):  
Radio Emission ◽  
Radio Telescope ◽  
Angular Resolution ◽  
Seyfert Galaxy ◽  
Narrow Line ◽  
Line Region ◽  
Typical Distances ◽  
Narrow Line Region

Markarian 6, a Seyfert Galaxy of type 1.5, is one of several Seyfert nuclei to be observed with MERLIN at 6 and 18 cm as part of a project to investigate the radio structures of these objects on sub–arcsecond scales (corresponding to scales of a few tens of parsecs at typical distances). The angular resolution of MERLIN at 6 cm is equivalent to that of the HST, making the radio images ideal for comparison with HST images of the optical Narrow–Line Region (NLR). In this paper we briefly discuss the results of our MERLIN observations of Markarian 6, along with a 6–cm Westerbork Synthesis Radio Telescope (WSRT) map of the arcsecond (kpc) scale radio emission. The data is discussed in more detail by Kukula et al. (1996) and Baum et al. (1993).

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