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- W3105389922 abstract "Abstract We performed deep follow up observations of the active spiral galaxy NGC 4258 with the ROSAT HRI and PSPC to study the different emission components. The overall luminosity of NGC 4258 is L x ~ 2 × 10 40 erg s −1 in the 0.1 – 2.4 keV ROSAT band. Besides a weak nuclear point source ( L x ≲ 10 38 erg s −1 ) fourteen point sources are detected in the NGC 4258 disk (integral L x ~ 3 × 10 39 erg s − 1 ). The bulk of the X-ray emission is not resolved. The main contributions are explained by hot interstellar medium along the anomalous spiral arms of NGC 4258 ( L x ~ 1 × 10 40 , T ~ 0.4 keV) and by interstellar medium escaping from NGC 4258 disk into the approaching halo hemisphere ( L x ~ 4 × 10 39 erg s −1 , T ~ 0.2 keV) Surface brightness, temperature and absorption profiles have been taken for the X-rays in the regions of the anomalous arms. The highest and lowest absorption was received for the NW and SE tips of the arms, respectively. Our X-ray findings are compared to a model of the anomalous arms which suggests that the bar of the galaxy causes shocks in the interstellar medium and might heat a small part of it to X-ray temperatures." @default.
- W3105389922 created "2020-11-23" @default.
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- W3105389922 date "1997-01-01" @default.
- W3105389922 modified "2023-09-26" @default.
- W3105389922 title "ROSAT Observations of NGC 4258" @default.
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- W3105389922 doi "https://doi.org/10.1017/s025292110007158x" @default.
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