2009A&A...504...73L


Query : 2009A&A...504...73L

2009A&A...504...73L - Astronomy and Astrophysics, volume 504, 73-79 (2009/9-2)

The bolometric luminosity of type 2 AGN from extinction-corrected [OIII]. No evidence of eddington-limited sources.

LAMASTRA A., BIANCHI S., MATT G., PEROLA G.C., BARCONS X. and CARRERA F.J.

Abstract (from CDS):

There have been recent claims that a significant fraction of type 2 AGN accrete close to or even above the Eddington limit. In type 2 AGN, the bolometric luminosity (Lb) is generally inferred from the [OIII] emission line luminosity (LOIII). The key issue in estimating the bolometric luminosity in these AGN, is therefore to know the bolometric correction to be applied to LOIII. A complication arises from the observed LOIII being affected by extinction, most likely from dust within the narrow line region. The extinction-corrected [OIII] luminosity (LcOIII) is a better estimator of the nuclear luminosity than LOIII. However, only the bolometric correction to be applied to the uncorrected LOIII has been evaluated so far. This paper is devoted to estimating the bolometric correction COIII=Lb/LcOIII for deriving the Eddington ratios for the type 2 AGN in a sample of SDSS objects.We collected 61 sources from the literature with reliable estimates of both LcOIII and X-ray luminosities (LX). To estimate COIII, we combined the observed correlation between LcOIII and LX with the X-ray bolometric correction.In contrast to previous studies, we found a linear correlation between LcOIII and LX. We estimated COIII using an earlier luminosity-dependent X-ray bolometric correction, and we found a mean value of COIII in the luminosity ranges log LOIII=38-40, 40-42, and 42-44 of 87, 142, and 454, respectively. We used it to calculate the Eddington ratio distribution of type 2 SDSS AGN at 0.3<z<0.4 and found that these sources are not accreting near their Eddington limit, contrary to previous claims.

Abstract Copyright:

Journal keyword(s): galaxies: active - galaxies: Seyfert - X-rays: galaxies

Simbad objects: 9

goto Full paper

goto View the references in ADS

Number of rows : 9
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 SDSS J075920.21+351903.4 Sy2 07 59 20.2 +35 19 04     21.16     ~ 5 0
2 [VV2006c] J083946.0+384319 Sy2 08 39 46.0 +38 43 18   20.97 20.28     ~ 11 0
3 SDSS J084041.04+383819.8 Sy2 08 40 41.0448050498 +38 38 19.837398391   20.75 19.90     ~ 16 0
4 SDSS J092318.04+010144.7 Sy2 09 23 18.04296 +01 01 44.7924   21.10 20.32     ~ 17 0
5 SDSS J094820.38+582526.6 Sy2 09 48 20.3801757501 +58 25 26.441781020   20.18 19.54     ~ 17 0
6 SDSS J133735.01-012815.6 Sy2 13 37 35.01096 -01 28 15.6396   19.83 19.03     ~ 19 0
7 NAME Circinus Galaxy Sy2 14 13 09.906 -65 20 20.47   10.89 9.84 10.6 10.0 ~ 1065 2
8 2dFGRS TGN278Z042 Sy2 14 30 27.664 -00 56 14.82   19.85 19.23 17.603   ~ 16 0
9 SDSS J143928.23+001538.1 Sy2 14 39 28.233 +00 15 38.11           ~ 7 0

To bookmark this query, right click on this link: simbad:objects in 2009A&A...504...73L and select 'bookmark this link' or equivalent in the popup menu


2021.10.27-10:02:40

© Université de Strasbourg/CNRS

    • Contact