X-ray spectropolarimetry of the bright atoll Serpens X-1
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2024
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| author | Ursini, F. Gnarini, A. Bianchi, S. Bobrikova, A. Capitanio, F. Cocchi, M. Fabiani, S. Farinelli, R. Kaaret, P. Matt, G. Ng, M. Poutanen, J. Ravi, S. Tarana, A. |
| author_facet | Ursini, F. Gnarini, A. Bianchi, S. Bobrikova, A. Capitanio, F. Cocchi, M. Fabiani, S. Farinelli, R. Kaaret, P. Matt, G. Ng, M. Poutanen, J. Ravi, S. Tarana, A. |
| contents | We present simultaneous X-ray polarimetric and spectral observations of the bright atoll source Ser~X-1 carried out with the Imaging X-ray Polarimetry Explorer (IXPE), NICER, and NuSTAR. We obtain an upper limit of 2% (99% confidence level) on the polarization degree in the 2--8 keV energy band. We detect four type-I X-ray bursts, two of which during the IXPE observation. This is the first time that has IXPE observed type-I X-ray bursts, and it allows us to place an upper limit on their polarization degree; however, due to the limited total number of counts in each burst, we obtain a relatively high upper limit (80%). We confirm the presence of reflection features in the X-ray spectrum, notably a broad iron line. Fitting the data with a relativistic reflection model, we derive a disk inclination of 25 deg. The spectral and polarization properties are comparable with other atolls observed by IXPE, suggesting a similar accretion geometry, and the relatively low polarization is consistent with the low inclination. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2408_16713 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | X-ray spectropolarimetry of the bright atoll Serpens X-1 Ursini, F. Gnarini, A. Bianchi, S. Bobrikova, A. Capitanio, F. Cocchi, M. Fabiani, S. Farinelli, R. Kaaret, P. Matt, G. Ng, M. Poutanen, J. Ravi, S. Tarana, A. High Energy Astrophysical Phenomena Solar and Stellar Astrophysics We present simultaneous X-ray polarimetric and spectral observations of the bright atoll source Ser~X-1 carried out with the Imaging X-ray Polarimetry Explorer (IXPE), NICER, and NuSTAR. We obtain an upper limit of 2% (99% confidence level) on the polarization degree in the 2--8 keV energy band. We detect four type-I X-ray bursts, two of which during the IXPE observation. This is the first time that has IXPE observed type-I X-ray bursts, and it allows us to place an upper limit on their polarization degree; however, due to the limited total number of counts in each burst, we obtain a relatively high upper limit (80%). We confirm the presence of reflection features in the X-ray spectrum, notably a broad iron line. Fitting the data with a relativistic reflection model, we derive a disk inclination of 25 deg. The spectral and polarization properties are comparable with other atolls observed by IXPE, suggesting a similar accretion geometry, and the relatively low polarization is consistent with the low inclination. |
| title | X-ray spectropolarimetry of the bright atoll Serpens X-1 |
| topic | High Energy Astrophysical Phenomena Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2408.16713 |