ROSAT observations of NGC 2023 and NGC 2024.
Abstract
The authors have observed the embedded stellar clusters of NGC 2024 (H II region) and NGC 2023 (reflection nebula) in soft X-rays (0.1-2.0 keV) both with the ROSAT PSPC and HRI. They analyzed the X-ray properties of the numerous detected sources such as luminosities and spectral parameters. The overall picture is different for the two star-forming regions. While in NGC 2023 only one out of 16 infrared sources was found with significance of at least 4σ, a fair fraction of the infrared cluster of NGC 2024 is X-ray bright. The authors cross-correlated their X-ray sources with sources previously detected at other wavelengths (e.g., infrared, Hα). In addition to a high positional correlation of the detected sources with K band sources there is no obvious correlation of individual infrared and X-ray properties. The authors conclude that the X-ray sources are low-mass young stellar objects, deeply embedded in the molecular cloud. In NGC 2024 they may contribute significantly to the observed ionization.
- Publication:
-
Roentgenstrahlung from the Universe
- Pub Date:
- February 1996
- Bibcode:
- 1996rftu.proc...31F
- Keywords:
-
- Young Stars: Star Clusters;
- Young Stars: X Rays;
- Young Stars: Star-Forming Regions;
- Young Stars: H II Regions