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GOODS-ALMA: 1.1 mm galaxy survey

Franco, M.; Elbaz, D.; Béthermin, M.; Magnelli, B.; Schreiber, C.; Ciesla, L.; Dickinson, M.; Nagar, N.; Silverman, J.; Daddi, E.; Alexander, D.M.; Wang, T.; Pannella, M.; Le Floc’h, E.; Pope, A.; Giavalisco, M.; Maury, A.J.; Bournaud, F.; Chary, R.; Demarco, R.; Ferguson, H.; Finkelstein, S.L.; Inami, H.; Iono, D.; Juneau, S.; Lagache, G.; Leiton, R.; Lin, L.; Magdis, G.; Messias, H.; Motohara, K.; Mullaney, J.; Okumura, K.; Papovich, C.; Pforr, J.; Rujopakarn, W.; Sargent, M.; Shu, X.; Zhou, L.

GOODS-ALMA: 1.1 mm galaxy survey Thumbnail


Authors

M. Franco

D. Elbaz

M. Béthermin

B. Magnelli

C. Schreiber

L. Ciesla

M. Dickinson

N. Nagar

J. Silverman

E. Daddi

T. Wang

M. Pannella

E. Le Floc’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. Lagache

R. Leiton

L. Lin

G. Magdis

H. Messias

K. Motohara

J. Mullaney

K. Okumura

C. Papovich

J. Pforr

W. Rujopakarn

M. Sargent

X. Shu

L. Zhou



Abstract

Aims. We present a 69 arcmin2 ALMA survey at 1.1 mm, GOODS-ALMA, matching the deepest HST-WFC3 H-band part of the GOODS-South field. Methods. We tapered the 0″24 original image with a homogeneous and circular synthesized beam of 0″60 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 5σ limiting depth of H = 28.2 AB (HST/WFC3 F160W). Results. ALMA detects 20 sources brighter than 0.7 mJy at 1.1 mm in the 0″60 tapered mosaic (rms sensitivity σ ≃ 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 × 1011 M⊙. 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.

Journal Article Type Article
Acceptance Date Jul 30, 2018
Online Publication Date Dec 11, 2018
Publication Date Dec 11, 2018
Deposit Date Jan 4, 2019
Publicly Available Date Jan 4, 2019
Journal Astronomy and astrophysics.
Print ISSN 0004-6361
Electronic ISSN 1432-0746
Publisher EDP Sciences
Peer Reviewed Peer Reviewed
Volume 620
Article Number A152
DOI https://doi.org/10.1051/0004-6361/201832928
Public URL https://durham-repository.worktribe.com/output/1311070

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Copyright Statement
Reproduced with permission from Astronomy & Astrophysics, © ESO.






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