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ALMACAL VII : first Interferometric number counts at 650 μm.

Klitsch, A. and Zwaan, M.A. and Smail, I. and Péroux, C. and Biggs, A.D. and Chen, C-C. and Ivison, R.J. and Popping, G. and Lagos, C. and Béthermin, M. and Swinbank, A.M. and Hamanowicz, A. and Dutta, R. (2020) 'ALMACAL VII : first Interferometric number counts at 650 μm.', Monthly notices of the Royal Astronomical Society., 495 (2). pp. 2332-2341.


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 650휇m 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 arcmin2 . The typical central rms in these fields is ∼ 100휇Jy beam−1 with the deepest maps reaching 휎 = 47휇Jy beam−1 at sub-arcsec resolution. Multi-wavelength 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 4.5휎, we find 21 dusty, star-forming galaxies with 650휇m flux densities of ≥ 0.7mJy. At the detection limit we resolve ' 100 per cent of the CIB at 650휇m, a significant improvement compared to low resolution studies at similar wavelength. We have therefore identified all the sources contributing to the EBL at 650 microns and predict that the contribution from objects with flux 0.7<mJy will be small.

Item Type:Article
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Publisher statement:This article has been accepted for publication in Monthly notices of the Royal Astronomical Society. ©: 2020 The Author(s) . Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Date accepted:01 May 2020
Date deposited:13 May 2020
Date of first online publication:12 May 2020
Date first made open access:13 May 2020

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