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| Main Authors: | , , , , , |
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| Format: | Preprint |
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2023
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2303.00782 |
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| _version_ | 1866909099173609472 |
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| author | Falcao, Anna Trindade Fabbiano, G. Elvis, M. Paggi, A. Maksym, W. P. Karovska, M. |
| author_facet | Falcao, Anna Trindade Fabbiano, G. Elvis, M. Paggi, A. Maksym, W. P. Karovska, M. |
| contents | We present Chandra ACIS-S imaging spectroscopy results of the extended (1.5''- 8'', 300 pc-1600 pc) hard X-ray emission of NGC 5728, the host galaxy of a Compton thick active galactic nucleus (CT AGN). We find spectrally and spatially-resolved features in the Fe K$α$ complex (5.0-7.5 keV), redward and blueward of the neutral Fe line at 6.4 keV in the extended narrow line region bicone. A simple phenomenological fit of a power law plus Gaussians gives a significance of 5.4$σ$ and 3.7$σ$ for the red and blue wings, respectively. Fits to a suite of physically consistent models confirm a significance $\geq$3$σ$ for the red wing. The significance of the blue wing may be diminished by the presence of rest frame highly ionized Fe XXV and Fe XXVI lines (1.4$σ$ - 3.7$σ$ range). A detailed investigation of the Chandra ACIS-S point spread function (PSF) and comparison with the observed morphology demonstrates that these red and blue wings are radially extended (~5'', ~1 kpc) along the optical bicone axis. If the wings emission is due solely to redshifted and blueshifted high-velocity neutral Fe K$α$ then the implied line-of-sight velocities are +/- ~0.1c, and their fluxes are consistent with being equal. A symmetric high-velocity outflow is then a viable explanation. This outflow has deprojected velocities ~100 times larger than the outflows detected in optical spectroscopic studies, potentially dominating the kinetic feedback power. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2303_00782 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Discovery of kiloparsec-scale semi-relativistic Fe K$α$ complex emission in NGC 5728 Falcao, Anna Trindade Fabbiano, G. Elvis, M. Paggi, A. Maksym, W. P. Karovska, M. Astrophysics of Galaxies High Energy Astrophysical Phenomena We present Chandra ACIS-S imaging spectroscopy results of the extended (1.5''- 8'', 300 pc-1600 pc) hard X-ray emission of NGC 5728, the host galaxy of a Compton thick active galactic nucleus (CT AGN). We find spectrally and spatially-resolved features in the Fe K$α$ complex (5.0-7.5 keV), redward and blueward of the neutral Fe line at 6.4 keV in the extended narrow line region bicone. A simple phenomenological fit of a power law plus Gaussians gives a significance of 5.4$σ$ and 3.7$σ$ for the red and blue wings, respectively. Fits to a suite of physically consistent models confirm a significance $\geq$3$σ$ for the red wing. The significance of the blue wing may be diminished by the presence of rest frame highly ionized Fe XXV and Fe XXVI lines (1.4$σ$ - 3.7$σ$ range). A detailed investigation of the Chandra ACIS-S point spread function (PSF) and comparison with the observed morphology demonstrates that these red and blue wings are radially extended (~5'', ~1 kpc) along the optical bicone axis. If the wings emission is due solely to redshifted and blueshifted high-velocity neutral Fe K$α$ then the implied line-of-sight velocities are +/- ~0.1c, and their fluxes are consistent with being equal. A symmetric high-velocity outflow is then a viable explanation. This outflow has deprojected velocities ~100 times larger than the outflows detected in optical spectroscopic studies, potentially dominating the kinetic feedback power. |
| title | Discovery of kiloparsec-scale semi-relativistic Fe K$α$ complex emission in NGC 5728 |
| topic | Astrophysics of Galaxies High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2303.00782 |