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| Format: | Preprint |
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2024
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| Online Access: | https://arxiv.org/abs/2412.04983 |
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| author | Tripodi, Roberta Martis, Nicholas Markov, Vladan Bradač, Maruša Di Mascia, Fabio Cammelli, Vieri D'Eugenio, Francesco Willott, Chris Curti, Mirko Bhatt, Maulik Gallerani, Simona Rihtaršič, Gregor Singh, Jasbir Gaspar, Gaia Harshan, Anishya Judež, Jon Merida, Rosa M. Desprez, Guillaume Sawicki, Marcin Goovaerts, Ilias Muzzin, Adam Noirot, Gaël Sarrouh, Ghassan T. E. Abraham, Roberto Asada, Yoshihisa Brammer, Gabriel Carpenter, Vicente Estrada Felicioni, Giordano Fujimoto, Seiji Iyer, Kartheik Mowla, Lamiya Strait, Victoria |
| author_facet | Tripodi, Roberta Martis, Nicholas Markov, Vladan Bradač, Maruša Di Mascia, Fabio Cammelli, Vieri D'Eugenio, Francesco Willott, Chris Curti, Mirko Bhatt, Maulik Gallerani, Simona Rihtaršič, Gregor Singh, Jasbir Gaspar, Gaia Harshan, Anishya Judež, Jon Merida, Rosa M. Desprez, Guillaume Sawicki, Marcin Goovaerts, Ilias Muzzin, Adam Noirot, Gaël Sarrouh, Ghassan T. E. Abraham, Roberto Asada, Yoshihisa Brammer, Gabriel Carpenter, Vicente Estrada Felicioni, Giordano Fujimoto, Seiji Iyer, Kartheik Mowla, Lamiya Strait, Victoria |
| contents | The James Webb Space Telescope (JWST) has recently discovered a new population of objects at high redshift referred to as `Little Red Dots' (LRDs). Their nature currently remains elusive, despite their surprisingly high inferred number densities. This emerging population of red point-like sources is reshaping our view of the early Universe and may shed light on the formation of high-redshift supermassive black holes. Here we present a spectroscopically confirmed LRD CANUCS-LRD-z8.6 at $z_{\rm spec}=8.6319\pm 0.0005$ hosting an Active Galactic Nucleus (AGN), using JWST data. This source shows the typical spectral shape of an LRD (blue UV and red optical continuum, unresolved in JWST imaging), along with broad H$β$ line emission, detection of high-ionization emission lines (CIV, NIV]) and very high electron temperature indicative of the presence of AGN. This is also combined with a very low metallicity ($Z<0.1 Z_\odot$). The presence of all these diverse features in one source makes CANUCS-LRD-z8.6 unique. We show that the inferred black hole mass of CANUCS-LRD-z8.6 ($M_{\rm BH}=1.0^{+0.6}_{-0.4}\times 10^{8}\rm ~M_\odot$) strongly challenges current standard theoretical models and simulations of black hole formation, and forces us to adopt `ad hoc' prescriptions. Indeed if massive seeds, or light seeds with super-Eddington accretion, are considered, the observed BH mass of CANUCS-LRD-z8.6 at $z=8.6$ can be reproduced. Moreover, the black hole is over-massive compared to its host, relative to the local $M_{\rm BH}-M_*$ relations, pointing towards an earlier and faster evolution of the black hole compared to its host galaxy. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2412_04983 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Red, hot, and very metal poor: extreme properties of a massive accreting black hole in the first 500 Myr Tripodi, Roberta Martis, Nicholas Markov, Vladan Bradač, Maruša Di Mascia, Fabio Cammelli, Vieri D'Eugenio, Francesco Willott, Chris Curti, Mirko Bhatt, Maulik Gallerani, Simona Rihtaršič, Gregor Singh, Jasbir Gaspar, Gaia Harshan, Anishya Judež, Jon Merida, Rosa M. Desprez, Guillaume Sawicki, Marcin Goovaerts, Ilias Muzzin, Adam Noirot, Gaël Sarrouh, Ghassan T. E. Abraham, Roberto Asada, Yoshihisa Brammer, Gabriel Carpenter, Vicente Estrada Felicioni, Giordano Fujimoto, Seiji Iyer, Kartheik Mowla, Lamiya Strait, Victoria Astrophysics of Galaxies The James Webb Space Telescope (JWST) has recently discovered a new population of objects at high redshift referred to as `Little Red Dots' (LRDs). Their nature currently remains elusive, despite their surprisingly high inferred number densities. This emerging population of red point-like sources is reshaping our view of the early Universe and may shed light on the formation of high-redshift supermassive black holes. Here we present a spectroscopically confirmed LRD CANUCS-LRD-z8.6 at $z_{\rm spec}=8.6319\pm 0.0005$ hosting an Active Galactic Nucleus (AGN), using JWST data. This source shows the typical spectral shape of an LRD (blue UV and red optical continuum, unresolved in JWST imaging), along with broad H$β$ line emission, detection of high-ionization emission lines (CIV, NIV]) and very high electron temperature indicative of the presence of AGN. This is also combined with a very low metallicity ($Z<0.1 Z_\odot$). The presence of all these diverse features in one source makes CANUCS-LRD-z8.6 unique. We show that the inferred black hole mass of CANUCS-LRD-z8.6 ($M_{\rm BH}=1.0^{+0.6}_{-0.4}\times 10^{8}\rm ~M_\odot$) strongly challenges current standard theoretical models and simulations of black hole formation, and forces us to adopt `ad hoc' prescriptions. Indeed if massive seeds, or light seeds with super-Eddington accretion, are considered, the observed BH mass of CANUCS-LRD-z8.6 at $z=8.6$ can be reproduced. Moreover, the black hole is over-massive compared to its host, relative to the local $M_{\rm BH}-M_*$ relations, pointing towards an earlier and faster evolution of the black hole compared to its host galaxy. |
| title | Red, hot, and very metal poor: extreme properties of a massive accreting black hole in the first 500 Myr |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2412.04983 |