22 Citations (Scopus)

Abstract

We present the first results from an XMM-Newton observation of the Fanaroff-Riley type I galaxy NGC 4261, which harbors a supermassive black hole and a low-ionization nuclear emission-line region. Here we focus on the X-ray properties of the nucleus, using the European Photon Imaging Camera pn data, The 0.6-10 keV continuum in best fitted by a thermal component with kT ∼ 0.7 keV, plus a power law with photon index Γ ∼ 1.4, absorbed by a column density NH ∼ 4 × 1022 cm-2. An unresolved Fe K emission line with EW ∼ 280 eV is detected at ∼7 keV. We also detect, for the first time, short-term flux variability from the nucleus, on a timescale of 3-5 ks. The short-term variations rule out an advection-dominated accretion flow as the only production mechanism of the X-ray continuum. Instead, we argue that the inner jet contributes to the emission in the X-ray band.

Original languageEnglish (US)
Pages (from-to)L37-L40
JournalAstrophysical Journal
Volume586
Issue number1 II
DOIs
StatePublished - Mar 20 2003

Fingerprint

XMM-Newton telescope
newton
nuclei
continuums
x rays
harbors
photons
advection
power law
harbor
ionization
cameras
accretion
galaxies
timescale

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Sambruna, R. M. ; Gliozzi, M. ; Eracleous, M. ; Brandt, W. N. ; Mushotzky, R. / The XMM-Newton view of the nucleus of NGC 4261. In: Astrophysical Journal. 2003 ; Vol. 586, No. 1 II. pp. L37-L40.
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abstract = "We present the first results from an XMM-Newton observation of the Fanaroff-Riley type I galaxy NGC 4261, which harbors a supermassive black hole and a low-ionization nuclear emission-line region. Here we focus on the X-ray properties of the nucleus, using the European Photon Imaging Camera pn data, The 0.6-10 keV continuum in best fitted by a thermal component with kT ∼ 0.7 keV, plus a power law with photon index Γ ∼ 1.4, absorbed by a column density NH ∼ 4 × 1022 cm-2. An unresolved Fe K emission line with EW ∼ 280 eV is detected at ∼7 keV. We also detect, for the first time, short-term flux variability from the nucleus, on a timescale of 3-5 ks. The short-term variations rule out an advection-dominated accretion flow as the only production mechanism of the X-ray continuum. Instead, we argue that the inner jet contributes to the emission in the X-ray band.",
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Sambruna, RM, Gliozzi, M, Eracleous, M, Brandt, WN & Mushotzky, R 2003, 'The XMM-Newton view of the nucleus of NGC 4261', Astrophysical Journal, vol. 586, no. 1 II, pp. L37-L40. https://doi.org/10.1086/374612

The XMM-Newton view of the nucleus of NGC 4261. / Sambruna, R. M.; Gliozzi, M.; Eracleous, M.; Brandt, W. N.; Mushotzky, R.

In: Astrophysical Journal, Vol. 586, No. 1 II, 20.03.2003, p. L37-L40.

Research output: Contribution to journalArticle

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T1 - The XMM-Newton view of the nucleus of NGC 4261

AU - Sambruna, R. M.

AU - Gliozzi, M.

AU - Eracleous, M.

AU - Brandt, W. N.

AU - Mushotzky, R.

PY - 2003/3/20

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N2 - We present the first results from an XMM-Newton observation of the Fanaroff-Riley type I galaxy NGC 4261, which harbors a supermassive black hole and a low-ionization nuclear emission-line region. Here we focus on the X-ray properties of the nucleus, using the European Photon Imaging Camera pn data, The 0.6-10 keV continuum in best fitted by a thermal component with kT ∼ 0.7 keV, plus a power law with photon index Γ ∼ 1.4, absorbed by a column density NH ∼ 4 × 1022 cm-2. An unresolved Fe K emission line with EW ∼ 280 eV is detected at ∼7 keV. We also detect, for the first time, short-term flux variability from the nucleus, on a timescale of 3-5 ks. The short-term variations rule out an advection-dominated accretion flow as the only production mechanism of the X-ray continuum. Instead, we argue that the inner jet contributes to the emission in the X-ray band.

AB - We present the first results from an XMM-Newton observation of the Fanaroff-Riley type I galaxy NGC 4261, which harbors a supermassive black hole and a low-ionization nuclear emission-line region. Here we focus on the X-ray properties of the nucleus, using the European Photon Imaging Camera pn data, The 0.6-10 keV continuum in best fitted by a thermal component with kT ∼ 0.7 keV, plus a power law with photon index Γ ∼ 1.4, absorbed by a column density NH ∼ 4 × 1022 cm-2. An unresolved Fe K emission line with EW ∼ 280 eV is detected at ∼7 keV. We also detect, for the first time, short-term flux variability from the nucleus, on a timescale of 3-5 ks. The short-term variations rule out an advection-dominated accretion flow as the only production mechanism of the X-ray continuum. Instead, we argue that the inner jet contributes to the emission in the X-ray band.

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