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• W4321605021 abstract "ABSTRACT We present band 6 ALMA observations of a heavily obscured radio-loud (L1.4 GHz = 1025.4 W Hz−1) active galactic nucleus (AGN) candidate at zphot = 6.83 ± 0.06 found in the 1.5 deg2 COSMOS field. The ALMA data reveal detections of exceptionally strong [C ii]158 $mu$m (z[C ii] = 6.8532) and underlying dust continuum emission from this object (COS-87259), where the [C ii] line luminosity, line width, and 158 $mu$m continuum luminosity are comparable to those seen from z ∼ 7 sub-mm galaxies and quasar hosts. The 158 $mu$m continuum detection suggests a total infrared luminosity of $9times 10^{12}, mathrm{ L}_odot$ with corresponding very large obscured star formation rate (1300 M⊙ yr−1) and dust mass ($2times 10^9, mathrm{ M}_odot$). The strong break seen between the VIRCam and IRAC photometry perhaps suggests that COS-87259 is an extremely massive reionization-era galaxy with $M_ast approx 1.7times 10^{11}, mathrm{ M}_odot$. Moreover, the MIPS, PACS, and SPIRE detections imply that this object harbours an AGN that is heavily obscured ($tau _{_{mathrm{9.7,mu m}}}=2.3$) with a bolometric luminosity of approximately $5times 10^{13}, mathrm{ L}_odot$. Such a very high AGN luminosity suggests that this object is powered by an ≈1.6 × 10$^9, mathrm{ M}_odot$ black hole if accreting near the Eddington limit, and is effectively a highly obscured version of an extremely ultraviolet (UV)-luminous (M1450 ≈ −27.3) z ∼ 7 quasar. Notably, these z ∼ 7 quasars are an exceedingly rare population (∼0.001 deg−2), while COS-87259 was identified over a relatively small field. Future very wide area surveys with e.g. Roman and Euclid have the potential to identify many more extremely red yet UV-bright z ≳ 7 objects similar to COS-87259, providing richer insight into the occurrence of intense obscured star formation and supermassive black hole growth among this population." @default.
• W4321605021 created "2023-02-24" @default.
• W4321605021 creator A5021906130 @default.
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• W4321605021 date "2023-02-15" @default.
• W4321605021 modified "2023-10-18" @default.
• W4321605021 title "ALMA confirmation of an obscured hyperluminous radio-loud AGN at <i>z</i> = 6.853 associated with a dusty starburst in the 1.5 deg2 COSMOS field" @default.
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