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| Main Authors: | , , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2024
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2409.03839 |
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| _version_ | 1866914939832107008 |
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| author | Foord, Adi Civano, Francesca Comerford, Julia M. Elvis, Martin Fabbiano, Giuseppina Liu, Tingting Lusso, Elisabeta Marchesi, Stefano Mezcua, Mar Muller-Sanchez, Francisco Nevin, Rebecca Nyland, Kristina |
| author_facet | Foord, Adi Civano, Francesca Comerford, Julia M. Elvis, Martin Fabbiano, Giuseppina Liu, Tingting Lusso, Elisabeta Marchesi, Stefano Mezcua, Mar Muller-Sanchez, Francisco Nevin, Rebecca Nyland, Kristina |
| contents | We present a multi-wavelength analysis of MCG+11-11-032, a nearby AGN with the unique classification of both a binary and a dual AGN candidate. With new Chandra observations we aim to resolve any dual AGN system via imaging data, and search for signs of a binary AGN via analysis of the X-ray spectrum. Analyzing the Chandra spectrum, we find no evidence of previously suggested double-peaked Fe K$α$ lines; the spectrum is instead best fit by an absorbed powerlaw with a single Fe K$α$ line, as well as an additional line centered at $\approx$7.5 keV. The Chandra observation reveals faint, soft, and extended X-ray emission, possibly linked to low-level nuclear outflows. Further analysis shows evidence for a compact, hard source -- MCG+11-11-032 X2 -- located 3.27'' from the primary AGN. Modeling MCG+11-11-032 X2 as a compact source, we find that it is relatively luminous ($L_{\text{2$-$10 keV}} = 1.52_{-0.48}^{+0.96}\times 10^{41}$ erg s$^{-1}$), and the location is coincident with an compact and off-nuclear source resolved in Hubble Space Telescope infrared (F105W) and ultraviolet (F621M, F547M) bands. Pairing our X-ray results with a 144 MHz radio detection at the host galaxy location, we observe X-ray and radio properties similar to those of ESO 243-49 HLX-1, suggesting that MCG+11-11-032 X2 may be a hyper-luminous X-ray source. This detection with Chandra highlights the importance of a high-resolution X-ray imager, and how previous binary AGN candidates detected with large-aperture instruments benefit from high-resolution follow-up. Future spatially resolved optical spectra, and deeper X-ray observations, can better constrain the origin of MCG+11-11-032 X2. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2409_03839 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Chandra Discovery of a Candidate Hyper-Luminous X-ray Source in MCG+11-11-032 Foord, Adi Civano, Francesca Comerford, Julia M. Elvis, Martin Fabbiano, Giuseppina Liu, Tingting Lusso, Elisabeta Marchesi, Stefano Mezcua, Mar Muller-Sanchez, Francisco Nevin, Rebecca Nyland, Kristina High Energy Astrophysical Phenomena We present a multi-wavelength analysis of MCG+11-11-032, a nearby AGN with the unique classification of both a binary and a dual AGN candidate. With new Chandra observations we aim to resolve any dual AGN system via imaging data, and search for signs of a binary AGN via analysis of the X-ray spectrum. Analyzing the Chandra spectrum, we find no evidence of previously suggested double-peaked Fe K$α$ lines; the spectrum is instead best fit by an absorbed powerlaw with a single Fe K$α$ line, as well as an additional line centered at $\approx$7.5 keV. The Chandra observation reveals faint, soft, and extended X-ray emission, possibly linked to low-level nuclear outflows. Further analysis shows evidence for a compact, hard source -- MCG+11-11-032 X2 -- located 3.27'' from the primary AGN. Modeling MCG+11-11-032 X2 as a compact source, we find that it is relatively luminous ($L_{\text{2$-$10 keV}} = 1.52_{-0.48}^{+0.96}\times 10^{41}$ erg s$^{-1}$), and the location is coincident with an compact and off-nuclear source resolved in Hubble Space Telescope infrared (F105W) and ultraviolet (F621M, F547M) bands. Pairing our X-ray results with a 144 MHz radio detection at the host galaxy location, we observe X-ray and radio properties similar to those of ESO 243-49 HLX-1, suggesting that MCG+11-11-032 X2 may be a hyper-luminous X-ray source. This detection with Chandra highlights the importance of a high-resolution X-ray imager, and how previous binary AGN candidates detected with large-aperture instruments benefit from high-resolution follow-up. Future spatially resolved optical spectra, and deeper X-ray observations, can better constrain the origin of MCG+11-11-032 X2. |
| title | Chandra Discovery of a Candidate Hyper-Luminous X-ray Source in MCG+11-11-032 |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2409.03839 |