2007A&A...461..931P


C.D.S. - SIMBAD4 rel 1.7 - 2019.12.14CET10:00:04

2007A&A...461..931P - Astronomy and Astrophysics, volume 461, 931-942 (2007/1-3)

XMM-Newton observation of the NLS1 galaxy Ark 564. I. Spectral analysis of the time-average spectrum.

PAPADAKIS I.E., BRINKMANN W., PAGE M.J., McHARDY I. and UTTLEY P.

Abstract (from CDS):

We present the results from the spectral analysis of the time-average spectrum of the Narrow Line Seyfert 1 (NLS1) galaxy Ark564 from a ∼100ks XMM-Newton observation. Our aim is to characterize accurately the shape of the time-average, X-ray continuum spectrum of the source and search for any emission and/or absorption features in it. We use the XMM-Newton data to obtain the X-ray spectrum of the source and we fit various spectral models to it. The time-average, 3-11keV spectrum is well fitted by a power-law of slope 2.43. We detect a weak (equivalent width ∼80eV) emission line at ∼6.7keV, which implies emission from ionized iron. There is no compelling evidence for significant broadening of the line.We also detect a possible Doppler shifted absorption line at 8.1keV. At energies ≲2keV, the spectrum is dominated by a smooth soft excess component which can be fitted well either by a model consisting of two black body components (kT∼0.15 and 0.07keV) or by a model consisting of a black body plus reflection from a relativistically-blurred, photoionized disc. We detect a broad, shallow flux deficit in the 0.65-0.85keV band, reminiscent of the iron unresolved transition array (UTA) features. We detect neither a strong absorption edge around 0.7keV nor an emission line around 1keV. The soft excess emission is consistent with being reflected emission from a geometrically flat disc, with solar abundances, illuminated by an isotropic source. The weakness of the iron line emission can be explained by relativistic blurring. The UTA feature implies the presence of warm material with a column density of 2-5x1020cm–2. If the absorption line at 8.1 keV corresponds to FeXXVI Kα, it suggests the presence of highly ionized absorbing material with NH>1023cm–2, outflowing at a high velocity of ∼0.17c.

Abstract Copyright:

Journal keyword(s): galaxies: active - galaxies: Seyfert - galaxies: individual: Ark 564 - X-rays: galaxies

Simbad objects: 11

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Number of rows : 11

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 Ton S 180 Sy1 00 57 20.2038086128 -22 22 56.577563819   14.60 14.34 15.23   ~ 266 0
2 Mrk 359 Sy1 01 27 32.5219447154 +19 10 43.837247537   14.89 14.22     ~ 269 0
3 NGC 1365 Sy1 03 33 36.458 -36 08 26.37 10.48 10.08 9.63 8.79 9.7 ~ 1481 2
4 QSO B0558-5026 BLL 05 59 47.3917733375 -50 26 52.026945176   15.18 14.97     ~ 241 1
5 Mrk 421 BLL 11 04 27.3139210166 +38 12 31.798324828   13.50 12.90 8.31   ~ 2336 1
6 3C 273 BLL 12 29 06.6996828061 +02 03 08.598846466   13.05 14.830 14.11   ~ 5254 1
7 ESO 383-35 Sy1 13 35 53.7686909139 -34 17 44.139127597   13.89 13.61 8.9   ~ 1362 0
8 ESO 445-50 Sy1 13 49 19.2607281800 -30 18 34.224136831   13.81 13.66 12.18   ~ 719 0
9 Mrk 478 Sy1 14 42 07.4713423763 +35 26 22.939531895   14.91 14.58     ~ 476 0
10 Mrk 896 Sy1 20 46 20.8416130527 -02 48 45.360486154   15.27 14.61     ~ 118 0
11 UGC 12163 Sy1 22 42 39.3364258078 +29 43 31.301194419   14.86 14.16     ~ 603 1

    Equat.    Gal    SGal    Ecl

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2019.12.14-10:00:04

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