The Chandra High-Energy Transmission Grating Observation of an X-Ray Ionization Cone in Markarian 3
Abstract
We present a preliminary analysis of the first high-resolution X-ray spectrum of a Seyfert 2 galaxy, Markarian 3, obtained with the High-Energy Transmission Grating Spectrometer on board the Chandra X-Ray Observatory. The high-energy spectrum (λ<~4 Å) is dominated by reflection of the active galactic nucleus continuum radiation in a cold, optically thick medium and contains bright Kα fluorescent lines from iron and silicon as well as weak, blended lines from sulfur and magnesium. The soft X-ray emission (4 Å<~λ<~23 Å) is spatially extended along the [O III] ionization cone and shows discrete signatures of emission following recombination and photoexcitation produced in a warm photoionized region. The measured iron L line fluxes indicate that emission from collisionally ionized plasma is almost completely negligible and does not contribute significantly to the total energy budget of the X-ray emission. We find that significant fractions of the H- and He-like resonance lines, as well as the observed iron L lines, are produced through reemission from the warm absorbing medium observed in Seyfert 1 galaxies. Its X-ray spectral properties are qualitatively consistent with those of a typical Seyfert 1 galaxy viewed at a different orientation and provide further convincing evidence for the existence of an obscured Seyfert 1 nucleus in Mrk 3.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- November 2000
- DOI:
- 10.1086/317282
- arXiv:
- arXiv:astro-ph/0009323
- Bibcode:
- 2000ApJ...543L.115S
- Keywords:
-
- Galaxies: Active;
- Galaxies: Individual: Name: Markarian 3;
- Galaxies: Nuclei;
- Galaxies: Seyfert;
- Techniques: Spectroscopic;
- X-Rays: Galaxies;
- Astrophysics
- E-Print:
- 16 pages, including 1 table and 2 figures