The XMM-Newton view of the nucleus of NGC 4261

R. M. Sambruna, M. Gliozzi, M. Eracleous, W. N. Brandt, R. Mushotzky

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24 Scopus citations


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
Issue number1 II
StatePublished - Mar 20 2003

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


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