On the relativistic iron line and soft excess in the Seyfert 1 galaxy Markarian 335

Paul O'Neill, Kirpal Nandra, Massimo Cappi, Anna Lia Longinotti, Stuart Sim

Research output: Contribution to journalArticle

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Abstract

We report a 133-ks XMM-Newton observation of the Seyfert 1 galaxy Markarian 335. The 0.4-12 keV spectrum contains an underlying power-law continuum, a soft excess below 2 keV, and a double-peaked iron emission feature in the 6-7 keV range. We investigate the possibility that the double-peaked emission might represent the characteristic signature of the accretion disc. Detailed investigations show that a moderately broad accretion disc line is most likely present, but that the peaks may be due to narrower components from more distant material. The peaks at 6.4 and 7 keV can be identified, respectively, with the molecular torus in active galactic nucleus unification schemes, and very highly ionized, optically thin gas filling the torus. The X-ray variability spectra on both long (~100 ks) and short (~1 ks) time-scales do not support the recent suggestion that the soft excess is an artefact of variable, moderately ionized absorption.
Original languageEnglish
Pages (from-to)94-98
Number of pages5
JournalMonthly Notices of the Royal Astronomical Society
Volume381
Issue number1
DOIs
Publication statusPublished - Oct 2007

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Markarian galaxies
accretion disks
accretion
iron
XMM-Newton telescope
active galactic nuclei
newton
suggestion
artifact
artifacts
power law
signatures
continuums
timescale
gases
gas
x rays

Cite this

O'Neill, Paul ; Nandra, Kirpal ; Cappi, Massimo ; Longinotti, Anna Lia ; Sim, Stuart. / On the relativistic iron line and soft excess in the Seyfert 1 galaxy Markarian 335. In: Monthly Notices of the Royal Astronomical Society. 2007 ; Vol. 381, No. 1. pp. 94-98.
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On the relativistic iron line and soft excess in the Seyfert 1 galaxy Markarian 335. / O'Neill, Paul; Nandra, Kirpal; Cappi, Massimo; Longinotti, Anna Lia; Sim, Stuart.

In: Monthly Notices of the Royal Astronomical Society, Vol. 381, No. 1, 10.2007, p. 94-98.

Research output: Contribution to journalArticle

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T1 - On the relativistic iron line and soft excess in the Seyfert 1 galaxy Markarian 335

AU - O'Neill, Paul

AU - Nandra, Kirpal

AU - Cappi, Massimo

AU - Longinotti, Anna Lia

AU - Sim, Stuart

N1 - Imported on 12 Apr 2017 - DigiTool details were: month (773h) = October; Journal title (773t) = Monthly Notices of the Royal Astronomical Society. ISSNs: 0035-8711;

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Y1 - 2007/10

N2 - We report a 133-ks XMM-Newton observation of the Seyfert 1 galaxy Markarian 335. The 0.4-12 keV spectrum contains an underlying power-law continuum, a soft excess below 2 keV, and a double-peaked iron emission feature in the 6-7 keV range. We investigate the possibility that the double-peaked emission might represent the characteristic signature of the accretion disc. Detailed investigations show that a moderately broad accretion disc line is most likely present, but that the peaks may be due to narrower components from more distant material. The peaks at 6.4 and 7 keV can be identified, respectively, with the molecular torus in active galactic nucleus unification schemes, and very highly ionized, optically thin gas filling the torus. The X-ray variability spectra on both long (~100 ks) and short (~1 ks) time-scales do not support the recent suggestion that the soft excess is an artefact of variable, moderately ionized absorption.

AB - We report a 133-ks XMM-Newton observation of the Seyfert 1 galaxy Markarian 335. The 0.4-12 keV spectrum contains an underlying power-law continuum, a soft excess below 2 keV, and a double-peaked iron emission feature in the 6-7 keV range. We investigate the possibility that the double-peaked emission might represent the characteristic signature of the accretion disc. Detailed investigations show that a moderately broad accretion disc line is most likely present, but that the peaks may be due to narrower components from more distant material. The peaks at 6.4 and 7 keV can be identified, respectively, with the molecular torus in active galactic nucleus unification schemes, and very highly ionized, optically thin gas filling the torus. The X-ray variability spectra on both long (~100 ks) and short (~1 ks) time-scales do not support the recent suggestion that the soft excess is an artefact of variable, moderately ionized absorption.

KW - Open access version available

KW - Galaxies: Seyfert

KW - Galaxies: active

KW - Galaxies: individual: Markarian 335

KW - X-rays: galaxies

U2 - 10.1111/j.1745-3933.2007.00376.x

DO - 10.1111/j.1745-3933.2007.00376.x

M3 - Article

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SP - 94

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JO - Monthly Notices of the Royal Astronomical Society

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