2004AJ....127.1799G


C.D.S. - SIMBAD4 rel 1.7 - 2019.11.15CET22:53:03

2004AJ....127.1799G - Astron. J., 127, 1799-1810 (2004/April-0)

A complete sample of soft X-ray-selected AGNs. II. Statistical analysis.

GRUPE D.

Abstract (from CDS):

Direct correlations and a principal component analysis (PCA) are presented for a complete sample of 110 soft X-ray-selected AGNs, of which about half are narrow-line Seyfert 1 galaxies (NLS1's). The direct correlation analyses show that narrower FWHM(Hβ) correlates with steeper X-ray spectrum, stronger optical Fe II emission, weaker [O III] emission and stronger short-term X-ray variability. This direct correlation analysis and the PCA confirm the Boroson & Green (1992) eigenvector 1 relationship for AGNs: Fe II strength anticorrelates with [O III] line strength. Eigenvector 1 is well correlated with the Eddington luminosity ratio L/LEdd, while eigenvector 2 shows a very good correlation with the mass of the central black hole MBHand the mass accretion rate M{dot}. The Eddington ratio L/LEddcorrelates with the X-ray spectral index αX and the black home mass MBHanticorrelates with the X-ray variability χ2/ν. The Eddington ratio L/LEddmay be interpreted as the age of an AGN: AGNs with steep X-ray spectra, strong Fe II, and weak [O III] are AGNs in an early phase of their evolution. In this hypothesis, NLS1's are young AGNs.

Abstract Copyright:

Journal keyword(s): Galaxies: Active - Galaxies: Quasars: General

CDS comments: Par 4.4 : PKS 2227-299 is a misprint for PKS 2227-399

Simbad objects: 7

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Number of rows : 7

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 3XMM J003915.8-511701 Sy1 00 39 15.8341273306 -51 17 01.480962252   15.77 15.28 15.66   ~ 117 0
2 Mrk 110 Sy1 09 25 12.8479868736 +52 17 10.386808297   16.82 16.41     ~ 493 0
3 2MASSI J1005418+433240 Sy1 10 05 41.8619295274 +43 32 40.446116728   17.09 16.89     ~ 71 0
4 IC 3599 Sy1 12 37 41.1939866364 +26 42 27.492074834   15.7 16.5     ~ 151 0
5 2RE J1337+244 Sy1 13 37 18.7198121988 +24 23 03.320690345     15.0     ~ 351 0
6 2MASS J16245659+7554560 BLL 16 24 56.5714665760 +75 54 55.978646466     16.60     ~ 50 0
7 QSO B2227-399 QSO 22 30 40.2791607315 -39 42 52.055208460   17.87 18.5 15.73   ~ 87 1

    Equat.    Gal    SGal    Ecl

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2019.11.15-22:53:03

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