XMM-Newton discovery of a sharp spectral feature at ∼ 7 keV in the narrow-line Seyfert 1 galaxy 1H 0707 - 495

Th Boller, A. C. Fabian, R. Sunyaev, J. Trümper, S. Vaughan, D. R. Ballantyne, W. N. Brandt, R. Keil, K. Iwasawa

Research output: Contribution to journalArticle

104 Citations (Scopus)

Abstract

We report the first detection of a sharp spectral feature in a narrow-line Seyfert 1 galaxy. Using XMM-Newton we have observed 1H 0707 - 495 and find a drop in flux by a factor of more than 2 at a rest-frame energy of ∼7 keV without any detectable narrow Fe Kα line emission. The energy of this feature suggests a connection with the neutral iron K photoelectric edge, but the lack of any obvious absorption in the spectrum at lower energies makes the interpretation challenging. We explore two alternative explanations for this unusual spectral feature: (i) partial-covering absorption by clouds of neutral material; and (ii) ionized disc reflection with lines and edges from different ionization stages of iron blurred together by relativistic effects. We note that both models require an iron overabundance to explain the depth of the feature. The X-ray light curve shows strong and rapid variability, changing by a factor of 4 during the observation. The source displays modest spectral variability which is uncorrelated with flux.

Original languageEnglish (US)
Pages (from-to)L1-L5
JournalMonthly Notices of the Royal Astronomical Society
Volume329
Issue number1
DOIs
StatePublished - Jan 1 2002

Fingerprint

XMM-Newton telescope
newton
galaxies
iron
energy
K lines
relativistic effects
light curve
ionization
coverings
x rays

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Boller, Th ; Fabian, A. C. ; Sunyaev, R. ; Trümper, J. ; Vaughan, S. ; Ballantyne, D. R. ; Brandt, W. N. ; Keil, R. ; Iwasawa, K. / XMM-Newton discovery of a sharp spectral feature at ∼ 7 keV in the narrow-line Seyfert 1 galaxy 1H 0707 - 495. In: Monthly Notices of the Royal Astronomical Society. 2002 ; Vol. 329, No. 1. pp. L1-L5.
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XMM-Newton discovery of a sharp spectral feature at ∼ 7 keV in the narrow-line Seyfert 1 galaxy 1H 0707 - 495. / Boller, Th; Fabian, A. C.; Sunyaev, R.; Trümper, J.; Vaughan, S.; Ballantyne, D. R.; Brandt, W. N.; Keil, R.; Iwasawa, K.

In: Monthly Notices of the Royal Astronomical Society, Vol. 329, No. 1, 01.01.2002, p. L1-L5.

Research output: Contribution to journalArticle

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T1 - XMM-Newton discovery of a sharp spectral feature at ∼ 7 keV in the narrow-line Seyfert 1 galaxy 1H 0707 - 495

AU - Boller, Th

AU - Fabian, A. C.

AU - Sunyaev, R.

AU - Trümper, J.

AU - Vaughan, S.

AU - Ballantyne, D. R.

AU - Brandt, W. N.

AU - Keil, R.

AU - Iwasawa, K.

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N2 - We report the first detection of a sharp spectral feature in a narrow-line Seyfert 1 galaxy. Using XMM-Newton we have observed 1H 0707 - 495 and find a drop in flux by a factor of more than 2 at a rest-frame energy of ∼7 keV without any detectable narrow Fe Kα line emission. The energy of this feature suggests a connection with the neutral iron K photoelectric edge, but the lack of any obvious absorption in the spectrum at lower energies makes the interpretation challenging. We explore two alternative explanations for this unusual spectral feature: (i) partial-covering absorption by clouds of neutral material; and (ii) ionized disc reflection with lines and edges from different ionization stages of iron blurred together by relativistic effects. We note that both models require an iron overabundance to explain the depth of the feature. The X-ray light curve shows strong and rapid variability, changing by a factor of 4 during the observation. The source displays modest spectral variability which is uncorrelated with flux.

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