HYPERION: broad-band X-ray-to-near-infrared emission of Quasars in the first billion years of the Universe
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| Autores principales: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2024
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| author | Saccheo, I. Bongiorno, A. Piconcelli, E. Zappacosta, L. Bischetti, M. D'Odorico, V. Done, C. Temple, M. J. Testa, V. Tortosa, A. Brusa, M. Carniani, S. Civano, F. Comastri, A. Cristiani, S. De Cicco, D. Elvis, M. Fan, X. Feruglio, C. Fiore, F. Gallerani, S. Giallongo, E. Gilli, R. Grazian, A. Guainazzi, M. Haardt, F. Maiolino, R. Menci, N. Miniutti, G. Nicastro, F. Paolillo, M. Puccetti, S. Salvestrini, F. Schneider, R. Tombesi, F. Tripodi, R. Valiante, R. Vallini, L. Vanzella, E. Vietri, G. Vignali, C. Vito, F. Volonteri, M. La Franca, F. |
| author_facet | Saccheo, I. Bongiorno, A. Piconcelli, E. Zappacosta, L. Bischetti, M. D'Odorico, V. Done, C. Temple, M. J. Testa, V. Tortosa, A. Brusa, M. Carniani, S. Civano, F. Comastri, A. Cristiani, S. De Cicco, D. Elvis, M. Fan, X. Feruglio, C. Fiore, F. Gallerani, S. Giallongo, E. Gilli, R. Grazian, A. Guainazzi, M. Haardt, F. Maiolino, R. Menci, N. Miniutti, G. Nicastro, F. Paolillo, M. Puccetti, S. Salvestrini, F. Schneider, R. Tombesi, F. Tripodi, R. Valiante, R. Vallini, L. Vanzella, E. Vietri, G. Vignali, C. Vito, F. Volonteri, M. La Franca, F. |
| contents | We aim at characterizing the X-ray-to-optical/near-infrared broad-band emission of luminous QSOs in the first Gyr of cosmic evolution to understand whether they exhibit differences compared to the lower-\textit{z} QSO population. Our goal is also to provide for these objects a reliable and uniform catalog of SED fitting derivable properties such as bolometric and monochromatic luminosities, Eddington ratios, dust extinction, strength of the hot dust emission. We characterize the X-ray/UV emission of each QSO using average SEDs from luminous Type 1 sources and calculate bolometric and monochromatic luminosities. Finally we construct a mean SED extending from the X-rays to the NIR bands. We find that the UV-optical emission of these QSOs can be modelled with templates of $z\sim$2 luminous QSOs. We observe that the bolometric luminosities derived adopting some bolometric corrections at 3000 Å ($BC_{3000\textÅ}$) largely used in the literature are slightly overestimated by 0.13 dex as they also include reprocessed IR emission. We estimate a revised value, i.e. $BC_{3000\textÅ}=3.3 $ which can be used for deriving $L_\text{bol}$ in \textit{z} $\geq$ 6 QSOs. A sub-sample of 11 QSOs is provided with rest-frame NIR photometry, showing a broad range of hot dust emission strength, with two sources exhibiting low levels of emission. Despite potential observational biases arising from non-uniform photometric coverage and selection biases, we produce a X-ray-to-NIR mean SED for QSOs at \textit{z} $\gtrsim$ 6, revealing a good match with templates of lower-redshift, luminous QSOs up to the UV-optical range, with a slightly enhanced contribution from hot dust in the NIR. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2411_02105 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | HYPERION: broad-band X-ray-to-near-infrared emission of Quasars in the first billion years of the Universe Saccheo, I. Bongiorno, A. Piconcelli, E. Zappacosta, L. Bischetti, M. D'Odorico, V. Done, C. Temple, M. J. Testa, V. Tortosa, A. Brusa, M. Carniani, S. Civano, F. Comastri, A. Cristiani, S. De Cicco, D. Elvis, M. Fan, X. Feruglio, C. Fiore, F. Gallerani, S. Giallongo, E. Gilli, R. Grazian, A. Guainazzi, M. Haardt, F. Maiolino, R. Menci, N. Miniutti, G. Nicastro, F. Paolillo, M. Puccetti, S. Salvestrini, F. Schneider, R. Tombesi, F. Tripodi, R. Valiante, R. Vallini, L. Vanzella, E. Vietri, G. Vignali, C. Vito, F. Volonteri, M. La Franca, F. Astrophysics of Galaxies We aim at characterizing the X-ray-to-optical/near-infrared broad-band emission of luminous QSOs in the first Gyr of cosmic evolution to understand whether they exhibit differences compared to the lower-\textit{z} QSO population. Our goal is also to provide for these objects a reliable and uniform catalog of SED fitting derivable properties such as bolometric and monochromatic luminosities, Eddington ratios, dust extinction, strength of the hot dust emission. We characterize the X-ray/UV emission of each QSO using average SEDs from luminous Type 1 sources and calculate bolometric and monochromatic luminosities. Finally we construct a mean SED extending from the X-rays to the NIR bands. We find that the UV-optical emission of these QSOs can be modelled with templates of $z\sim$2 luminous QSOs. We observe that the bolometric luminosities derived adopting some bolometric corrections at 3000 Å ($BC_{3000\textÅ}$) largely used in the literature are slightly overestimated by 0.13 dex as they also include reprocessed IR emission. We estimate a revised value, i.e. $BC_{3000\textÅ}=3.3 $ which can be used for deriving $L_\text{bol}$ in \textit{z} $\geq$ 6 QSOs. A sub-sample of 11 QSOs is provided with rest-frame NIR photometry, showing a broad range of hot dust emission strength, with two sources exhibiting low levels of emission. Despite potential observational biases arising from non-uniform photometric coverage and selection biases, we produce a X-ray-to-NIR mean SED for QSOs at \textit{z} $\gtrsim$ 6, revealing a good match with templates of lower-redshift, luminous QSOs up to the UV-optical range, with a slightly enhanced contribution from hot dust in the NIR. |
| title | HYPERION: broad-band X-ray-to-near-infrared emission of Quasars in the first billion years of the Universe |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2411.02105 |