The intense starburst HDF 850.1 in a galaxy overdensity at z ≈ 5.2 in the Hubble Deep Field

摘要: The Hubble Deep Field provides one of the deepest multiwavelength views distant Universe and has led to detection thousands galaxies seen throughout cosmic time1. An early map at a wavelength 850 micrometres, which is sensitive dust emission powered by star formation, revealed brightest source in field, dubbed HDF 850.1 (ref. 2). For more than decade, despite significant efforts, no counterpart was found shorter wavelengths, it not possible determine its redshift, size or mass3, 4, 5, 6, 7. Here we report redshift z = 5.183 for HDF 850.1, from millimetre-wave molecular line scan. This places galaxy overdensity z ≈ 5.2, corresponding age only 1.1 billion years after Big Bang. significantly higher earlier estimates3, 8 those most hundreds submillimetre-bright identified so far. star-formation rate 850 solar masses per year spatially resolved on scales 5 kiloparsecs, with an implied dynamical mass about 1.3 × 1011 masses, fraction present form gas. Despite our accurate determination position, emitting starlight remains elusive