2003A&A...397..883G


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.08CET20:08:05

2003A&A...397..883G - Astronomy and Astrophysics, volume 397, 883-890 (2003/1-3)

XMM-Newton observations of the Seyfert 1 galaxy NGC 3227.

GONDOIN P., ORR A., LUMB D. and SIDDIQUI H.

Abstract (from CDS):

We report on an XMM-Newton observation of the Seyfert 1 galaxy NGC 3227 performed in November 2000. The observed X-ray spectrum above 4keV is well fitted by a hard power law continuum (Γ≃1.5) and an absorption edge at 7.6keV. An Fe K emission line with an equivalent width of 213eV is detected at 6.4keV. The line is narrow suggesting contribution from material in low ionization states (<Fe XVII) relatively far from a central black hole. The continuum is strongly absorbed at soft energies by a column of neutral gas (≃6.5x1022cm–2) larger than previously measured and covering a significant fraction (≃90%) of the central source. The soft X-ray continuum is also attenuated due to the presence of ionized material (ξ≃50-90erg/s*cm) suggesting the presence of a substantial amount of gas (NH≃2-9x1021cm–2) in the vicinity (<0.4pc) of the nucleus. We find that NGC 3227 exhibits significant spectral variability above 2 keV on time scales of a few ksec during the XMM-Newton observations. This short term variability is likely related to variation in the continuum emission. Comparisons with previous observations indicate that variability on timescale of a month also involves a change in the column densities of neutral absorbing material along the line of sight to the nucleus.

Abstract Copyright:

Journal keyword(s): galaxies: individual: NGC 3227 - galaxies: nuclei - galaxies: Seyfert

Simbad objects: 2

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Number of rows : 2

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 NGC 3226 GiP 10 23 27.0067240562 +19 53 54.682329315   14.32 13.33     ~ 399 1
2 NGC 3227 GiP 10 23 30.57 +19 51 54.3   12.61 11.79     ~ 1567 2

    Equat.    Gal    SGal    Ecl

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