scholarly journals The relation between the properties of the NLR in narrow-line Seyfert 1 galaxies and the accretion rate

2006 ◽  
Vol 2 (S238) ◽  
pp. 473-474
Author(s):  
Dawei Xu ◽  
Stefanie Komossa
Keyword(s):  
Accretion Rate ◽  
Sloan Digital Sky Survey ◽  
Physical Parameters ◽  
Broad Line ◽  
Narrow Line ◽  
Black Hole Mass ◽  
Line Region ◽  
Sky Survey ◽  
Narrow Line Region ◽  
The Relationship

AbstractWe present a systematic study of the properties of the narrow-line region (NLR) of narrow-line Seyfert 1 galaxies (NLS1s) using Sloan Digital Sky Survey (SDSS) spectroscopy. Various correlations between the observed parameters and physical properties of NLS1s and broad-line Seyfert 1 galaxies (BLS1s) are detected. We search for possible origins of these trends by employing correlation analyses. We further investigate the relationship between black hole mass, Eddington ratio (L/LEdd) and physical parameters of the NLR.

scholarly journals Properties of Broad and Narrow Line Seyfert galaxies selected from SDSS

2020 ◽  
pp. 219-226
Author(s):  
Vivek Kumar Jha ◽  
Hum Chand ◽  
Vineet Ojha
Keyword(s):  
Emission Line ◽  
Iron Content ◽  
Accretion Rate ◽  
Seyfert Galaxies ◽  
Sloan Digital Sky Survey ◽  
Broad Line ◽  
Narrow Line ◽  
Sky Survey ◽  
Single Epoch ◽  
Two Populations

A comparative study of a representative sample of Broad and Narrow line Seyfert galaxies is presented. These galaxies have been selected from the 16th data release of the Sloan Digital Sky Survey (SDSS-DR16). Some of the properties derived from single epoch spectrum vary significantly between the two populations. We find that the emission regions of Narrow line Seyfert galaxies are rich in iron content and the accretion rate is higher compared to the Broad line Seyfert galaxies. In our analysis, the H emission line is found to be asymmetric in few of the galaxies with more number of Narrow-line Seyfert 1 (NlSy1) galaxies showing blue asymmetries i.e. traces of outflowing gas as compared to the Broad-line Seyfert 1 (BlSy1) galaxies. This behaviour may be explained by the higher iron content present in the emission line regions of NlSy1 galaxies.

scholarly journals Near-IR Spectroscopy of High-z QSOs: Relating the Broad and Narrow-Line Regions

1997 ◽  
Vol 159 ◽  
pp. 258-259
Author(s):  
M.S. Brotherton
Keyword(s):  
Simple Model ◽  
Broad Line ◽  
Narrow Line ◽  
Strong Correlations ◽  
Broad Line Region ◽  
Near Ir ◽  
Line Region ◽  
Derived Properties ◽  
Narrow Line Region ◽  
Line Widths

Recent investigations of the broad UV lines in luminous QSOs identified strong correlations involving emission-line widths, shifts, equivalent widths, and ratios (Francis et al. 1992; Wills et al. 1993; Brotherton et al. 1994a, b). A simple model developed to explain these trends approximates UV broad lines as emission from two regions, an intermediate-line region (ILR), and a very broad-line region (VBLR), together comprising the traditional broad-line region (BLR). The observed and derived properties for the ILR and VBLR are summarized in Table 1, along with typical values for the narrow-line region (NLR).

scholarly journals The Distribution and Evolution of Black Hole Mass in Broad Line Quasars

2009 ◽  
Vol 5 (S267) ◽  
pp. 263-263
Author(s):  
Brandon C. Kelly ◽  
Marianne Vestergaard ◽  
Xiaohui Fan ◽  
Lars Hernquist ◽  
Philip Hopkins ◽  
...  
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
Mass Function ◽  
Sloan Digital Sky Survey ◽  
Broad Line ◽  
Black Hole Mass ◽  
Sky Survey ◽  
Black Hole Growth ◽  
Hole Growth ◽  
Eddington Limit

We present the first estimate of the black hole mass function (BHMF) of broad-line quasars (BLQSOs) that self-consistently corrects for incompleteness and the statistical uncertainty in the mass estimates, based on a sample of 9886 quasars at 1 < z < 4.5 drawn from the Sloan Digital Sky Survey. We find evidence for “cosmic downsizing” of black holes in BLQSOs, where the peak in their number density shifts to higher redshift with increasing black hole mass. We estimate the lifetime of the BLQSO phase to be 70 ± 5 Myr for supermassive black holes (SMBHs) at z = 1 with a mass of MBH = 109M⊙, and we constrain the maximum mass of a black hole in a BLQSO to be ~ 1010M⊙. We find that most BLQSOs are not radiating at or near the Eddington limit. Our results are consistent with models for self-regulated black hole growth, where the BLQSO phase occurs at the end of a fueling event when black hole feedback unbinds the accreting gas.

scholarly journals A REVISED BROAD-LINE REGION RADIUS AND BLACK HOLE MASS FOR THE NARROW-LINE SEYFERT 1 NGC 4051

2009 ◽  
Vol 702 (2) ◽  
pp. 1353-1366 ◽  
Author(s):  
K. D. Denney ◽  
L. C. Watson ◽  
B. M. Peterson ◽  
R. W. Pogge ◽  
D. W. Atlee ◽  
...  
Keyword(s):  
Black Hole ◽  
Broad Line ◽  
Narrow Line ◽  
Black Hole Mass ◽  
Broad Line Region ◽  
Line Region ◽  
Ngc 4051

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).

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