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GOODS-ALMA: 1.1 mm galaxy survey - I. Source catalogue and optically dark galaxies

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Version 2 2023-06-12, 07:24
Version 1 2023-06-09, 14:42
journal contribution
posted on 2023-06-12, 07:24 authored by M Franco, D Elbaz, M Béthermin, B Magnelli, C Schreiber, L Ciesla, M Dickinson, N Nagar, J Silverman, E Daddi, D M Alexander, T Wang, M Pannella, E Le Foc'h, A Pope, M Giavalisco, A J Maury, F Bournaud, R Chary, R Demarco, H Ferguson, S L Finkelstein, H Inami, D Iono, S Juneau, G Legache, R Leiton, L Lin, G Magdis, H Messias, K Motohara, J Mullaney, K Okumura, C Papovich, J Pforr, W Rujopakarn, Mark Sargent, X Shu, L Zhou
Aims. We present a 69 arcmin2 ALMA survey at 1.1mm, GOODS–ALMA, matching the deepest HST–WFC3 H-band part of the GOODS–South field. Methods. We tapered the 00024 original image with a homogeneous and circular synthesized beam of 00060 to reduce the number of independent beams – thus reducing the number of purely statistical spurious detections – and optimize the sensitivity to point sources. We extracted a catalog of galaxies purely selected by ALMA and identified sources with and without HST counterparts down to a 5s limiting depth of H=28.2 AB (HST/WFC3 F160W). Results. ALMA detects 20 sources brighter than 0.7 mJy at 1.1mm in the 00060 tapered mosaic (rms sensitivity s ' 0.18 mJy.beam-1 ) with a purity greater than 80%. Among these detections, we identify three sources with no HST nor Spitzer-IRAC counterpart, consistent with the expected number of spurious galaxies from the analysis of the inverted image; their definitive status will require additional investigation. We detect additional three sources with HST counterparts either at high significance in the higher resolution map, or with different detection-algorithm parameters ensuring a purity greater than 80%. Hence we identify in total 20 robust detections. Conclusions. Our wide contiguous survey allows us to push further in redshift the blind detection of massive galaxies with ALMA with a median redshift of z = 2.92 and a median stellar mass of M? = 1.1 × 1011M. Our sample includes 20% HST–dark galaxies (4 out of 20), all detected in the mid-infrared with Spitzer–IRAC. The near-infrared based photometric redshifts of two of them (z~4.3 and 4.8) suggest that these sources have redshifts z > 4. At least 40% of the ALMA sources host an X-ray AGN, compared to ~14% for other galaxies of similar mass and redshift. The wide area of our ALMA survey provides lower values at the bright end of number counts than single-dish telescopes affected by confusion.

History

Publication status

  • Published

File Version

  • Published version

Journal

Astronomy and Astrophysics

ISSN

0004-6361

Publisher

EDP Sciences

Issue

A152

Volume

619

Page range

1-26

Department affiliated with

  • Physics and Astronomy Publications

Research groups affiliated with

  • Astronomy Centre Publications

Full text available

  • Yes

Peer reviewed?

  • Yes

Legacy Posted Date

2018-08-23

First Open Access (FOA) Date

2018-08-29

First Compliant Deposit (FCD) Date

2018-08-21

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