High-resolution X-ray spectroscopy of four active galaxies - Probing the intercloud medium

Details High-resolution X-ray spectroscopy of four active galaxies - Probing the intercloud medium High-resolution X-ray spectroscopy of four active galaxies - Probing the intercloud medium

Jul 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...358..139l&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 358, July 20, 1990, p. 139-152.

Astronomy and Astrophysics

Astronomy

5

Active Galaxies, Galactic Nuclei, Interstellar Matter, Molecular Clouds, X Ray Astronomy, X Ray Spectroscopy, Astronomical Models, Emission Spectra, High Resolution, Line Spectra, Oxygen, Photoionization

Scientific paper

The focal plane crystal spectrometer (FPCS) on the Einstein Observatory has been used to perform a high-resolution spectroscopic search for oxygen X-ray line emission from four active galaxies: Fairall 9, Mrk 421, Mrk 501, and PKS 0548 - 322. Specifically, O VIII Ly-alpha and Ly-beta, whose unredshifted energies are 653 and 775 eV, respectively, were sought. No narrow-line emission was detected within the energy bands searched. Upper limits are calculated on the line flux from these sources of 30 eV equivalent width and use a photoionization model to place corresponding upper limits on the densities of diffuse gas surrounding the active nuclei. The upper limits on gas density range from about 0.02-50/cu cm and probe various radial distances from the central source. This is the first time high-resolution X-ray spectroscopy has been used to place constraints on the intercloud medium in active galaxies.

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