ROSAT HRI Observations of M31 Supernova Remnants

@article{Magnier1997ROSATHO,  title={ROSAT HRI Observations of M31 Supernova Remnants},  author={Eugene A. Magnier and F. A. Primini and Saskia Prins and Jan van Paradijs and Walter H. G. Lewin},  journal={The Astrophysical Journal},  year={1997},  volume={490},  pages={649 - 652},  url={https://api.semanticscholar.org/CorpusID:54162850}}
The measured densities are upper limits for the dominant low-density component of the ISM for supernova remnants previously identified from surveys using narrowband optical observations.

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