Inner-shell 1s-2p soft X-ray absorption lines

Ehud Behar*, Hagai Netzer

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


The HULLAC atomic code is used to compute wavelengths and oscillator strengths for the 1s-np innershell absorption lines in Li-like to F-like ions of neon, magnesium, aluminum, silicon, sulfur, argon, calcium, and iron. Many of these lines are expected to be observed in Chandra and XMM-Newton high-resolution X-ray spectra of active galaxies. The new atomic data are incorporated in the ION code for spectral modeling of photoionized plasmas. The calculated spectra are subsequently compared with the spectrum of NGC 3783 and show very good agreement. The usefulness of these lines as diagnostics for the ionization state, column densities, and velocities in line-of-sight photoionized gas is highlighted.

Original languageEnglish
Pages (from-to)165-170
Number of pages6
JournalAstrophysical Journal
Issue number1 I
StatePublished - 1 May 2002


  • Atomic data
  • Atomic processes
  • Galaxies: active
  • Galaxies: nuclei
  • Line: formation
  • X-rays: galaxies


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