High-resolution X-ray spectroscopy of M87 with the Einstein Observatory: the detection of an O VIII emission line.
Abstract
The paper deals with high-resolution X-ray spectroscopy performed to study the extended source surrounding the giant elliptical galaxy, M87, in the Virgo cluster. From observations carried out with a focal plane crystal spectrometer, L-alpha emission was detected from hydrogenic oxygen (O VIII). Upper limits could be set on lines from intermediate ionization states of iron. The presence of a quantity of cooler matter surrounding M87 was revealed, which has important implications for cluster models and favors a radiatively controlled accretion mechanism.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- November 1979
- DOI:
- 10.1086/183104
- Bibcode:
- 1979ApJ...234L..33C
- Keywords:
-
- Elliptical Galaxies;
- Emission Spectra;
- Galactic Clusters;
- Oxygen Spectra;
- X Ray Spectroscopy;
- Astronomical Observatories;
- Astrophysics;
- Focal Plane Devices;
- Intergalactic Media;
- Lyman Alpha Radiation;
- Astrophysics;
- Clusters of Galaxies:Intergalactic Matter;
- Galaxies:Oxygen Lines;
- Galaxies:X-Ray Spectra;
- Spectrometers:X Rays