TY - JOUR
T1 - Faint end of 1.3 mm number counts revealed by alma
AU - Hatsukade, Bunyo
AU - Ohta, Kouji
AU - Seko, Akifumi
AU - Yabe, Kiyoto
AU - Akiyama, Masayuki
N1 - Copyright:
Copyright 2014 Elsevier B.V., All rights reserved.
PY - 2013/6/1
Y1 - 2013/6/1
N2 - We present the faint end of number counts at 1.3 mm (238 GHz) obtained with the Atacama Large Millimeter/submillimeter Array (ALMA). Band 6 observations were carried out targeting 20 star-forming galaxies at z ∼ 1.4 in the Subaru/XMM-Newton Deep Survey field. In the observations, we serendipitously detect 15 sources (≥3.8σ, S 1.3 mm = 0.15-0.61 mJy) other than the targeted sources. We create number counts by using these "sub-mJy sources," which probe the faintest flux range among surveys at millimeter wavelengths. The number counts are consistent with (flux-scaled) number counts at 850 μm and 870 μm obtained with gravitational lensing clusters. The ALMA number counts agree well with model predictions, which suggest that these sub-mJy populations are more like "normal" star-forming galaxies than "classical" submillimeter galaxies with intense star-forming activity. In this flux range, ∼80% of the extragalactic background light at 1.3 mm is resolved into individual sources.
AB - We present the faint end of number counts at 1.3 mm (238 GHz) obtained with the Atacama Large Millimeter/submillimeter Array (ALMA). Band 6 observations were carried out targeting 20 star-forming galaxies at z ∼ 1.4 in the Subaru/XMM-Newton Deep Survey field. In the observations, we serendipitously detect 15 sources (≥3.8σ, S 1.3 mm = 0.15-0.61 mJy) other than the targeted sources. We create number counts by using these "sub-mJy sources," which probe the faintest flux range among surveys at millimeter wavelengths. The number counts are consistent with (flux-scaled) number counts at 850 μm and 870 μm obtained with gravitational lensing clusters. The ALMA number counts agree well with model predictions, which suggest that these sub-mJy populations are more like "normal" star-forming galaxies than "classical" submillimeter galaxies with intense star-forming activity. In this flux range, ∼80% of the extragalactic background light at 1.3 mm is resolved into individual sources.
KW - cosmology: observations
KW - galaxies: ISM
KW - galaxies: evolution
KW - galaxies: formation
KW - galaxies: high-redshift
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U2 - 10.1088/2041-8205/769/2/L27
DO - 10.1088/2041-8205/769/2/L27
M3 - Article
AN - SCOPUS:84877976336
VL - 769
JO - Astrophysical Journal Letters
JF - Astrophysical Journal Letters
SN - 2041-8205
IS - 2
M1 - L27
ER -