C.D.S. - SIMBAD4 rel 1.7 - 2019.11.14CET00:54:46

2004A&A...413..139G - Astronomy and Astrophysics, volume 413, 139-144 (2004/1-1)

The XMM-Newton view of NGC 6251.


Abstract (from CDS):

We report on the nuclear X-ray properties of the radio galaxy NGC 6251 observed with XMM-Newton. NGC 6251 is a well-known radio galaxy with intermediate FRI/II radio properties. It is optically classified as a Seyfert 2 and hosts a supermassive black hole with mass ∼6x108M. The 0.4-10keV EPIC pn continuum is best fitted by two thermal components (kT∼0.5 and 1.4keV, respectively), plus a power law with photon index Γ∼1.9 absorbed by a column density NH∼5x1020/cm2. We confirm the previous ASCA detection of a strong iron line. The line, resolved in the EPIC pn spectrum, is adequately fitted with a broad (σ∼0.6keV) Gaussian at rest-frame energy 6.4keV with EW∼220eV. We also detect, for the first time, short-term, low-amplitude variability of the nuclear flux on a timescale of a few ks. The spectral properties argue in favor of the presence of a standard accretion disk, ruling out the base of the jet as the sole origin of the X-rays. The moderate X-ray luminosity and lack of strong intrinsic absorption suggest that NGC 6251 is a ``pure'' type 2 AGN which lacks a broad-line region.

Abstract Copyright:

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

Simbad objects: 2

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Number of rows : 2

N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
1 NGC 4261 LIN 12 19 23.21607184 +05 49 29.7000920   13.92 12.87     ~ 1090 0
2 NGC 6251 Sy2 16 32 31.96990024 +82 32 16.3999540 15.24 14.66 12.89 7.62   ~ 643 0

    Equat.    Gal    SGal    Ecl

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