PCA of PCA: Principal Component Analysis of Partial Covering Absorption in NGC 1365

@article{Parker2014PCAOP,
  title={PCA of PCA: Principal Component Analysis of Partial Covering Absorption in NGC 1365},
  author={Michael L. Parker and Dominic J. Walton and Andrew C. Fabian and Guido Risaliti},
  journal={Monthly Notices of the Royal Astronomical Society},
  year={2014},
  volume={441},
  pages={1817-1824}
}
We analyse 400 ks of XMM–Newton data on the active galactic nucleus NGC 1365 using principal component analysis (PCA) to identify model-independent spectral components. We find two significant components and demonstrate that they are qualitatively different from those found in MCG–6-30-15 using the same method. As the variability in NGC 1365 is known to be due to changes in the parameters of a partial covering neutral absorber, this shows that the same mechanism cannot be the driver of… 

Revealing the X-ray variability of AGN with principal component analysis

We analyse a sample of 26 active galactic nuclei (AGN) with deep XMM–Newton observations, using principal component analysis (PCA) to find model-independent spectra of the different variable

Using principal component analysis to understand the variability of PDS 456

We present a spectral-variability analysis of the low-redshift quasar PDS 456 using principal component analysis. In the XMM-Newton data, we find a strong peak in the first principal component at the

THE MULTI-LAYER VARIABLE ABSORBERS IN NGC 1365 REVEALED BY XMM-NEWTON AND NuSTAR

Between 2012 July and 2013 February, NuSTAR and XMM-Newton performed four long-look joint observations of the type 1.8 Seyfert, NGC 1365. We have analyzed the variable absorption seen in these

Revealing the ultrafast outflow in IRAS 13224-3809 through spectral variability

We present an analysis of the long-term X-ray variability of the extreme narrow-line Seyfert 1 (NLS1) galaxy IRAS 13224-3809 using principal component analysis (PCA) and fractional excess variability

X-ray narrow emission lines from the nuclear region of NGC 1365

NGC 1365 is a Seyfert 2 galaxy with a starburst ring in its nuclear region. In this work we look at the XMM Reflection Grating Spectrometer (RGS) data from four 2012-13, three 2007 and two 2004

Multi-epoch X-ray spectral analysis of the narrow-line Seyfert 1 galaxy Mrk 478

A multi-epoch X-ray spectral and variability analysis is conducted for the narrow-line Seyfert 1 (NLS1) active galactic nucleus (AGN) Mrk 478. All available X-ray data from XMM–Newton and Suzaku

Variable blurred reflection in the narrow-line Seyfert 1 galaxy Mrk 493

We examine a 200 ks XMM-Newton observation of the narrow-line Seyfert 1 galaxy Mrk 493. The active galaxy was half as bright as in a previous 2003 snapshot observation and the current lower flux

Suzaku observations of Mrk 335: Confronting partial covering and relativistic reflection

We report on the deepest X-ray observation of the narrow-line Seyfert 1 galaxy Mrk 335 in the low-flux state obtained with Suzaku. The data are compared to a 2006 high-flux Suzaku observation when

On the reality of broad iron L lines from the narrow line Seyfert 1 galaxies 1H0707–495 and IRAS 13224–3809

We performed time resolved spectroscopy of 1H0707–495 and IRAS 13224–3809 using long XMM-Newton observations. These are strongly variable narrow line Seyfert 1 galaxies and show broad features around

A study of X-ray narrow emission lines from ionised gas in Active Galactic Nuclei

This thesis presents a study of X-ray narrow emission lines from ionised gas within Active Galactic Nuclei (AGN) and is based on the analysis of high- resolution X-ray spectra from XMM-Newton’s

References

SHOWING 1-10 OF 22 REFERENCES

Principal component analysis of MCG–06-30-15 with XMM–Newton

We analyse the spectral variability of MCG–06-30-15 with 600 k s of XMM–Newton data, including 300 k s of new data from the joint XMM–Newton and NuSTAR 2013 observational campaign. We use principal

XMM–Newton study of the complex and variable spectrum of NGC 4051

We study the X-ray spectral variability of the narrow line Seyfert 1 galaxy NGC 4051 as observed during two XMM-Newton observations. To gain insight on the general behaviour, we first apply

The variable X-ray spectrum of Markarian 766 - I. Principal components analysis

Aims. We analyse a long XMM-Newton observation of the narrow-line Seyfert 1 galaxy Mrk 766, using the marked spectral variability on timescales >20 ks to separate components in the X-ray spectrum.

An absorption origin for the X-ray spectral variability of MCG-6-30-15

Context. The Seyfert I galaxy MCG–6-30-15 shows one of the best examples of a broad “red wing” of emission in its X-ray spectrum at energies 2 20 keV. Methods. We compiled all the available

Highly Ionized Iron Absorption Lines from Outflowing Gas in the X-Ray Spectrum of NGC 1365

We present the discovery of four absorption lines in the X-ray spectrum of the Seyfert galaxy NGC 1365, at energies between 6.7 and 8.3 keV. The lines are detected with high statistical confidence

The lack of variability of the iron line in MCG–6‐30‐15: general relativistic effects

ABSTRACT The spectrum and variability of the Seyfert galaxy MCG–6-30-15 can be decomposedinto two apparently disconnected components: a highly variable power law and analmost constant component which

On why the iron K-shell absorption in AGN is not a signature of the local warm/hot intergalactic medium

We present a comparison between the 2001 XMM–Newton and 2005 Suzaku observations of the quasar, PG 1211+143, at z= 0.0809. Variability is observed in the 7 keV iron K-shell absorption line (at 7.6

A long hard look at MCG–6-30-15 with XMM-Newton

We present the first results from a 325-ks observation of the Seyfert 1 galaxy MCG–6-30-15 with XMM-Newton and BeppoSAX. The strong, broad, skewed iron line is clearly detected and is well

A rapidly spinning supermassive black hole at the centre of NGC 1365

TLDR
X-ray observations of NGC 1365 are reported that reveal the relativistic disk features through broadened Fe-line emission and an associated Compton scattering excess of 10–30 kiloelectronvolts.

IMAGING THE CIRCUMNUCLEAR REGION OF NGC 1365 WITH CHANDRA

We present the first Chandra/ACIS imaging study of the circumnuclear region of the nearby Seyfert galaxy NGC 1365. The X-ray emission is resolved into pointlike sources and complex, extended