ALMACAL VII: first interferometric number counts at 650 mu m

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  • Klitsch, Anne
  • M. A. Zwaan
  • Ian Smail
  • C. Peroux
  • A. D. Biggs
  • Chian-Chou Chen
  • R. J. Ivison
  • G. Popping
  • C. Lagos
  • M. Bethermin
  • A. M. Swinbank
  • A. Hamanowicz
  • R. Dutta

Measurements of the cosmic far-infrared background (CIB) indicate that emission from many extragalactic phenomena, including star formation and black hole accretion, in the Universe can be obscured by dust. Resolving the CIB to study the population of galaxies in which this activity takes place is a major goal of submillimetre astronomy. Here, we present interferometric 650 mu m submillimetre number counts. Using the Band 8 data from the ALMACAL survey, we have analysed 81 ALMA calibrator fields together covering a total area of 5.5 arcmin(2). The typical central rms in these fields is similar to 100 mu Jy beam(-1) with the deepest maps reaching sigma = 47 mu Jy beam(-1) at sub-arcsec resolution. Multiwavelength coverage from ALMACAL allows us to exclude contamination from jets associated with the calibrators. However, residual contamination by jets and lensing remain a possibility. Using a signal-to-noise threshold of 4.5 sigma, we find 21 dusty, star-forming galaxies with 650 mu m flux densities of >= 0.7 mJy. At the detection limit we resolve similar or equal to 100 per cent of the CIB at 650 mu m, a significant improvement compared to low-resolution studies at similar wavelength. We have therefore identified all the sources contributing to the EBL at 650 mu m and predict that the contribution from objects with flux 0.7 mJy will be small.

Original languageEnglish
JournalMonthly Notices of the Royal Astronomical Society
Volume495
Issue number2
Pages (from-to)2332-2341
Number of pages10
ISSN0035-8711
DOIs
Publication statusPublished - Jun 2020

    Research areas

  • galaxies: evolution, galaxies: starburst, submillimetre: galaxies, COSMOLOGY LEGACY SURVEY, DEGREE EXTRAGALACTIC SURVEY, AZTEC/ASTE 1.1-MM SURVEY, DEEP FIELD, SOURCE CATALOG, REDSHIFT SURVEY, RADIO-SOURCES, SUBMILLIMETER, GALAXY, MAPS

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