X-ray properties of reverberation-mapped AGNs with super-Eddington accreting massive black holes
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arXiv
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| Autores principales: | , , , , , , , , , |
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| Formato: | Preprint |
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2024
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| _version_ | 1866909073762418688 |
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| author | Maithil, Jaya Brotherton, Michael S. Shemmer, Ohad Luo, Bin Du, Pu Wang, Jian-Min Chen, Hu Gallagher, Sarah C. Li, Yan-Rong Nemmen, Rodrigo S. |
| author_facet | Maithil, Jaya Brotherton, Michael S. Shemmer, Ohad Luo, Bin Du, Pu Wang, Jian-Min Chen, Hu Gallagher, Sarah C. Li, Yan-Rong Nemmen, Rodrigo S. |
| contents | The X-ray properties of Active Galactic Nuclei (AGNs) depend on their underlying physical parameters, particularly the accretion rate. We identified eight reverberation-mapped AGNs with some of the largest known accretion rates without high-quality X-ray data. We obtained new Chandra ACIS-S X-ray observations and nearly simultaneous optical spectrophotometry to investigate the properties of these AGNs with extreme super-Eddington accreting black holes (SEAMBHs). We combined our new X-ray measurements with those of other reverberation-mapped AGNs, which have the best-determined masses and accretion rates. The trend of the steepening of the spectral slope between X-ray and optical-UV, $α_{\rm ox}$, with increasing optical-UV luminosity, $L_{2500Å}$, holds true for even the most extreme SEAMBHs. One of our new SEAMBHs appears X-ray weak for its luminosity, perhaps due to absorption associated with orientation effects involving a slim disk thought to be present in highly accreting systems. The correlation of the $\rm 2-8~ keV$ X-ray photon index with the accretion rate also holds for the extreme SEAMBHs, which show some of the largest photon indices reported for AGNs. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2401_07895 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | X-ray properties of reverberation-mapped AGNs with super-Eddington accreting massive black holes Maithil, Jaya Brotherton, Michael S. Shemmer, Ohad Luo, Bin Du, Pu Wang, Jian-Min Chen, Hu Gallagher, Sarah C. Li, Yan-Rong Nemmen, Rodrigo S. High Energy Astrophysical Phenomena Astrophysics of Galaxies The X-ray properties of Active Galactic Nuclei (AGNs) depend on their underlying physical parameters, particularly the accretion rate. We identified eight reverberation-mapped AGNs with some of the largest known accretion rates without high-quality X-ray data. We obtained new Chandra ACIS-S X-ray observations and nearly simultaneous optical spectrophotometry to investigate the properties of these AGNs with extreme super-Eddington accreting black holes (SEAMBHs). We combined our new X-ray measurements with those of other reverberation-mapped AGNs, which have the best-determined masses and accretion rates. The trend of the steepening of the spectral slope between X-ray and optical-UV, $α_{\rm ox}$, with increasing optical-UV luminosity, $L_{2500Å}$, holds true for even the most extreme SEAMBHs. One of our new SEAMBHs appears X-ray weak for its luminosity, perhaps due to absorption associated with orientation effects involving a slim disk thought to be present in highly accreting systems. The correlation of the $\rm 2-8~ keV$ X-ray photon index with the accretion rate also holds for the extreme SEAMBHs, which show some of the largest photon indices reported for AGNs. |
| title | X-ray properties of reverberation-mapped AGNs with super-Eddington accreting massive black holes |
| topic | High Energy Astrophysical Phenomena Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2401.07895 |