Results of the summarizing process for the arXiv paper: 2308.12823v1

In this letter, the authors present the discovery of a remarkable astronomical object: the highest redshift, heavily obscured, radio-loud quasi-stellar object (QSO) candidate. This discovery was made using a combination of observations from various telescopes and instruments, including the James Webb Space Telescope's Near Infrared Camera (NIRCam) and Mid-Infrared Instrument (MIRI), as well as mid-infrared, sub-millimeter, and radio imaging in the COSMOS-Web field. By analyzing multi-frequency radio observations and mid-infrared photometry, the researchers were able to identify a powerful growing supermassive black hole with significant spectral steepening of the radio spectral energy distribution. The measurements revealed a flux density of approximately 2 millijanskys at 1.32 GHz ($f_{1.32 \mathrm{GHz}} \sim 2$ mJy), a value of $q_{24\mu m}$ equal to -1.1, and a spectral index $\alpha_{1.32-3\mathrm{GHz}}$ of -1.2 with a change in slope ($\Delta \alpha$) of -0.4. To further investigate this intriguing object, additional observations were conducted using ALMA (Atacama Large Millimeter/submillimeter Array), deep ground-based telescopes, and other space-based data sources alongside the unprecedented resolution and sensitivity provided by JWST. Surprisingly, no evidence of QSO contribution to the ultraviolet/optical/near-infrared data was found; this absence suggests that heavy obscuration is present in this system with an estimated column density higher than $10^{23}$ cm$^{−2}$. The wealth of deep ultraviolet to submillimeter photometric data allowed for an accurate determination of the source's photometric redshift ($z_\mathrm{phot}$). The authors report a singular solution photo-$z$ of $z_\mathrm{phot} = 7.65^{+0.4}_{−0.3}$. Additionally they estimate an extremely massive host galaxy with a stellar mass of $\log M_{\star} = 11.92 \pm 0.06\ \mathrm{M}_{\odot}$. This discovery represents the furthest known obscured radio loud QSO candidate and provides valuable insights into the population of heavily obscured QSOs during these early epochs of the universe; its level of obscuration observed aligns with most representative but observationally scarce population at this redshift range.

• Discovery of highest redshift, heavily obscured, radio-loud quasi-stellar object (QSO) candidate
• Combination of observations from various telescopes and instruments used
• Identification of powerful growing supermassive black hole with significant spectral steepening
• Flux density measured at approximately 2 millijanskys at 1.32 GHz
• Absence of QSO contribution to ultraviolet/optical/near-infrared data suggests heavy obscuration
• Photometric redshift determined as $z_\mathrm{phot} = 7.65^{+0.4}_{−0.3}$
• Extremely massive host galaxy with stellar mass estimated at $\log M_{\star} = 11.92 \pm 0.06\ \mathrm{M}_{\odot}$
• Furthest known obscured radio loud QSO candidate discovered

Unprecedented Discovery of the Highest Redshift, Heavily Obscured, Radio-Loud Quasi-Stellar Object (QSO) Candidate

Astronomers have made a remarkable discovery of an astronomical object with the highest redshift and heavy obscuration. This was achieved by combining observations from various telescopes and instruments including James Webb Space Telescope's Near Infrared Camera (NIRCam) and Mid-Infrared Instrument (MIRI). The findings were further investigated using ALMA (Atacama Large Millimeter/submillimeter Array), deep ground-based telescopes, and other space-based data sources.

Multi-Frequency Radio Observations & Mid-Infrared Photometry

The researchers analyzed multi-frequency radio observations and mid-infrared photometry to identify a powerful growing supermassive black hole with significant spectral steepening of the radio spectral energy distribution. The measurements revealed a flux density of approximately 2 millijanskys at 1.32 GHz ($f_{1.32 \mathrm{GHz}} \sim 2$ mJy), a value of $q_{24\mu m}$ equal to -1.1, and a spectral index $\alpha_{1.32-3\mathrm{GHz}}$ of -1.2 with a change in slope ($\Delta \alpha$) of -0.4.

Absence Of QSO Contribution To Ultraviolet/Optical/Near Infrared Data

Surprisingly, no evidence of QSO contribution to the ultraviolet/optical/near infrared data was found; this absence suggests that heavy obscuration is present in this system with an estimated column density higher than $10^{23}$ cm$^{−2}$.

Accurate Determination Of Source's Photometric Redshift

The wealth of deep ultraviolet to submillimeter photometric data allowed for an accurate determination of the source's photometric redshift ($z_\mathrm{phot}$). The authors reported a singular solution photo-$z$of $z_\mathrm{phot} = 7.65^{+0.4}_{−0.3}$. Additionally they estimate an extremely massive host galaxy with a stellar mass of $\log M_{\star} = 11.92 \pm 0