BASS XLI: the correlation between Mid-infrared emission lines and Active Galactic Nuclei emission
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| Natura: | Preprint |
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2024
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| author | Bierschenk, M. Ricci, C. Temple, M. J. Satyapal, S. Cann, J. Xie, Y. Diaz, Y. Ichikawa, K. Koss, M. J. Bauer, F. E. Rojas, A. Kakkad, D. Tortosa, A. Ricci, F. Mushotzky, R. Kawamuro, T. Gupta, K. K. Trakhtenbrot, B. Chang, C. S. Riffel, R. Oh, K. Harrison, F. Powell, M. Stern, D. Urry, C. M. |
| author_facet | Bierschenk, M. Ricci, C. Temple, M. J. Satyapal, S. Cann, J. Xie, Y. Diaz, Y. Ichikawa, K. Koss, M. J. Bauer, F. E. Rojas, A. Kakkad, D. Tortosa, A. Ricci, F. Mushotzky, R. Kawamuro, T. Gupta, K. K. Trakhtenbrot, B. Chang, C. S. Riffel, R. Oh, K. Harrison, F. Powell, M. Stern, D. Urry, C. M. |
| contents | We analyze the Spitzer spectra of 140 active galactic nuclei (AGN) detected in the hard X-rays (14-195 keV) by the Burst Alert Telescope (BAT) on board Swift. This sample allows us to probe several orders of magnitude in black hole masses ($10^6-10^9 M_{\odot}$), Eddington ratios ($10^{-3}-1$), X-ray luminosities ($10^{42}-10^{45}\rm\,erg\,s^{-1}$), and X-ray column densities ($10^{20}-10^{24}\rm\,cm^{-2}$). The AGN emission is expected to be the dominant source of ionizing photons with energies $\gtrsim50$ eV, and therefore high-ionization mid-infrared (MIR) emission lines such as [Ne V] 14.32, 24.32 $μ$m and [O IV] 25.89 $μ$m are predicted to be good proxies of AGN activity, and robust against obscuration effects. We find high detection rates ($\gtrsim85-90$ per cent) for the mid-infrared coronal emission lines in our AGN sample. The luminosities of these lines are correlated with the 14-150 keV luminosity (with a typical scatter of $σ\sim 0.4-0.5$ dex), strongly indicating that the mid-infrared coronal line emission is driven by AGN activity. Interestingly, we find that the coronal lines are more tightly correlated to the bolometric luminosity ($σ\sim 0.2-0.3$ dex), calculated from careful analysis of the spectral energy distribution, than to the X-ray luminosity. We find that the relationship between the coronal line strengths and $L_{14-150\rm\,keV}$ is independent of black hole mass, Eddington ratio and X-ray column density. This confirms that the mid-infrared coronal lines can be used as unbiased tracers of the AGN power for X-ray luminosities in the $10^{42}-10^{45}\rm\,erg\,s^{-1}$ range. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2409_17334 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | BASS XLI: the correlation between Mid-infrared emission lines and Active Galactic Nuclei emission Bierschenk, M. Ricci, C. Temple, M. J. Satyapal, S. Cann, J. Xie, Y. Diaz, Y. Ichikawa, K. Koss, M. J. Bauer, F. E. Rojas, A. Kakkad, D. Tortosa, A. Ricci, F. Mushotzky, R. Kawamuro, T. Gupta, K. K. Trakhtenbrot, B. Chang, C. S. Riffel, R. Oh, K. Harrison, F. Powell, M. Stern, D. Urry, C. M. High Energy Astrophysical Phenomena Astrophysics of Galaxies We analyze the Spitzer spectra of 140 active galactic nuclei (AGN) detected in the hard X-rays (14-195 keV) by the Burst Alert Telescope (BAT) on board Swift. This sample allows us to probe several orders of magnitude in black hole masses ($10^6-10^9 M_{\odot}$), Eddington ratios ($10^{-3}-1$), X-ray luminosities ($10^{42}-10^{45}\rm\,erg\,s^{-1}$), and X-ray column densities ($10^{20}-10^{24}\rm\,cm^{-2}$). The AGN emission is expected to be the dominant source of ionizing photons with energies $\gtrsim50$ eV, and therefore high-ionization mid-infrared (MIR) emission lines such as [Ne V] 14.32, 24.32 $μ$m and [O IV] 25.89 $μ$m are predicted to be good proxies of AGN activity, and robust against obscuration effects. We find high detection rates ($\gtrsim85-90$ per cent) for the mid-infrared coronal emission lines in our AGN sample. The luminosities of these lines are correlated with the 14-150 keV luminosity (with a typical scatter of $σ\sim 0.4-0.5$ dex), strongly indicating that the mid-infrared coronal line emission is driven by AGN activity. Interestingly, we find that the coronal lines are more tightly correlated to the bolometric luminosity ($σ\sim 0.2-0.3$ dex), calculated from careful analysis of the spectral energy distribution, than to the X-ray luminosity. We find that the relationship between the coronal line strengths and $L_{14-150\rm\,keV}$ is independent of black hole mass, Eddington ratio and X-ray column density. This confirms that the mid-infrared coronal lines can be used as unbiased tracers of the AGN power for X-ray luminosities in the $10^{42}-10^{45}\rm\,erg\,s^{-1}$ range. |
| title | BASS XLI: the correlation between Mid-infrared emission lines and Active Galactic Nuclei emission |
| topic | High Energy Astrophysical Phenomena Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2409.17334 |