NUSTAR and XMM-Newton Spectroscopy of Ark 564
Ark 564 is a Narrow line Seyfert 1 that has been well observed in the 0.3-10 keV X-ray band. It has also been previously observed in the 3-50 keV band in a previous analysis using 200 ks NuSTAR observational data [24], which has revealed features such as a steep spectrum, strong soft excess, an iron...
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| Format: | Thesis |
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Massachusetts Institute of Technology
2022
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| Online Access: | https://hdl.handle.net/1721.1/139287 |
| _version_ | 1811082856681701376 |
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| author | Zhang, Rachel C. |
| author2 | Kara, Erin |
| author_facet | Kara, Erin Zhang, Rachel C. |
| author_sort | Zhang, Rachel C. |
| collection | MIT |
| description | Ark 564 is a Narrow line Seyfert 1 that has been well observed in the 0.3-10 keV X-ray band. It has also been previously observed in the 3-50 keV band in a previous analysis using 200 ks NuSTAR observational data [24], which has revealed features such as a steep spectrum, strong soft excess, an iron K emission line, and dramatic variability. We conduct a detailed analysis combining this 2015 NuSTAR observation with another 2 NuSTAR observations, one for 400 ks, and a shorter one for 38 ks, both collected in 2018. We also include 2 ~114 ks XMM-Newton observations that overlap with the 400 ks NuSTAR observation to span the whole 0.3-50 keV energy range. We perform spectral analysis of both the NuSTAR and the NuSTAR+XMM- Newton data to test whether previously observed features are still displayed. We find that the best fit model requires a relativistic reflection component, although the current state of available models still needs to be improved on to understand the physical picture of these sources. We also examine the root mean square (RMS) spectra of the observations and find that the current models underestimate the variability of the soft excess, which could imply a higher variable reflection component or an additional variable soft excess component. |
| first_indexed | 2024-09-23T12:10:10Z |
| format | Thesis |
| id | mit-1721.1/139287 |
| institution | Massachusetts Institute of Technology |
| last_indexed | 2024-09-23T12:10:10Z |
| publishDate | 2022 |
| publisher | Massachusetts Institute of Technology |
| record_format | dspace |
| spelling | mit-1721.1/1392872022-01-15T03:34:16Z NUSTAR and XMM-Newton Spectroscopy of Ark 564 Zhang, Rachel C. Kara, Erin Massachusetts Institute of Technology. Department of Physics Ark 564 is a Narrow line Seyfert 1 that has been well observed in the 0.3-10 keV X-ray band. It has also been previously observed in the 3-50 keV band in a previous analysis using 200 ks NuSTAR observational data [24], which has revealed features such as a steep spectrum, strong soft excess, an iron K emission line, and dramatic variability. We conduct a detailed analysis combining this 2015 NuSTAR observation with another 2 NuSTAR observations, one for 400 ks, and a shorter one for 38 ks, both collected in 2018. We also include 2 ~114 ks XMM-Newton observations that overlap with the 400 ks NuSTAR observation to span the whole 0.3-50 keV energy range. We perform spectral analysis of both the NuSTAR and the NuSTAR+XMM- Newton data to test whether previously observed features are still displayed. We find that the best fit model requires a relativistic reflection component, although the current state of available models still needs to be improved on to understand the physical picture of these sources. We also examine the root mean square (RMS) spectra of the observations and find that the current models underestimate the variability of the soft excess, which could imply a higher variable reflection component or an additional variable soft excess component. S.B. 2022-01-14T15:01:37Z 2022-01-14T15:01:37Z 2021-06 2021-06-21T21:08:40.544Z Thesis https://hdl.handle.net/1721.1/139287 In Copyright - Educational Use Permitted Copyright retained by author(s) https://rightsstatements.org/page/InC-EDU/1.0/ application/pdf Massachusetts Institute of Technology |
| spellingShingle | Zhang, Rachel C. NUSTAR and XMM-Newton Spectroscopy of Ark 564 |
| title | NUSTAR and XMM-Newton Spectroscopy of Ark 564 |
| title_full | NUSTAR and XMM-Newton Spectroscopy of Ark 564 |
| title_fullStr | NUSTAR and XMM-Newton Spectroscopy of Ark 564 |
| title_full_unstemmed | NUSTAR and XMM-Newton Spectroscopy of Ark 564 |
| title_short | NUSTAR and XMM-Newton Spectroscopy of Ark 564 |
| title_sort | nustar and xmm newton spectroscopy of ark 564 |
| url | https://hdl.handle.net/1721.1/139287 |
| work_keys_str_mv | AT zhangrachelc nustarandxmmnewtonspectroscopyofark564 |