J/A+A/608/A15 ALMA survey of submm galaxies in COSMOS field (Brisbin+, 2017)
An ALMA survey of submillimeter galaxies in the COSMOS field:
Multiwavelength counterparts and redshift distribution.
Brisbin D., Miettinen O., Aravena M., Smolcic V., Delvecchio I., Jiang C.,
Magnelli B., Albrecht M., Arancibia A.M., Aussel H., Baran N., Bertoldi F.,
Bethermin M., Capak P., Casey C.M., Civano F., Hayward C.C., Ilbert O.,
Karim A., Le Fevre O., Marchesi S., Mccracken H.J., Navarrete F., Novak M.,
Riechers D., Padilla N., Salvato M., Scott K., Schinnerer E., Sheth K.,
Tasca L.
<Astron. Astrophys., 608, A15 (2017)>
=2017A&A...608A..15B 2017A&A...608A..15B (SIMBAD/NED BibCode)
ADC_Keywords: Galaxy catalogs ; Millimetric/submm sources ; Photometry, SDSS ;
Photometry, infrared
Keywords: galaxies: distances and redshifts - galaxies: evolution -
galaxies: statistics - galaxies: high-redshift - catalogs
Abstract:
We carried out targeted ALMA observations of 129 fields in the COSMOS
region at 1.25mm, detecting 152 galaxies at S/N≥5 with an average
continuum RMS of 150 µJy. These fields represent a S/N-limited
sample of AzTEC/ASTE sources with 1.1mm S/N≥4 over an area of 0.72
square degrees. Given ALMA's fine resolution and the exceptional
spectroscopic and multiwavelength photometric data available in
COSMOS, this survey allows us unprecedented power in identifying
submillimeter galaxy counterparts and determining their redshifts
through spectroscopic or photometric means. In addition to 30 sources
with prior spectroscopic redshifts, we identified redshifts for 113
galaxies through photometric methods and an additional nine sources
with lower limits, which allowed a statistically robust determination
of the redshift distribution. We have resolved 33 AzTEC sources into
multi-component systems and our redshifts suggest that nine are likely
to be physically associated. Our overall redshift distribution peaks
at z∼2.0 with a high-redshift tail skewing the median redshift to
z~=2.48±0.05. We find that brighter millimeter sources are
preferentially found at higher redshifts. Our faintest sources, with
S1.25mm<1.25mJy, have a median redshift of z~=2.18±0.09, while
the brightest sources, S1.25mm>1.8mJy, have a median redshift of
z~=3.08±0.17. After accounting for spectral energy distribution
shape and selection effects, these results are consistent with several
previous submillimeter galaxy surveys, and moreover, support the
conclusion that the submillimeter galaxy redshift distribution is
sensitive to survey depth.
Description:
We carried out targeted observations of 129 fields within the COSMOS
region in cycle 2 ALMA operations at 1.25mm (240GHz). The
observations were taken between 09 and 11 December 2014, under good
weather conditions. These fields were drawn from Aretxaga et al.
(2011, Cat. J/MNRAS/415/3831) to include a flux-limited sample of
AzTEC/ASTE sources with (deboosted) 1.1mm flux densities ≥3.5mJy
covering the inner 0.72 square degrees of COSMOS.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea2.dat 173 97 *UV-NIR photometry for sources drawn from COSMOS2015
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Note on tablea2.dat: Data are in AB magnitudes with photometric offsets applied
according to Ilbert et al. (2009, Cat. J/ApJ/690/1236) and
Salvato et al. (2011, Cat. J/ApJ/742/61).
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See also:
J/ApJ/690/1236 : COSMOS photometric redshift catalog (Ilbert+, 2009)
J/ApJ/742/61 : AGNs from XMM- & C-COSMOS Photometric redshift (Salvato+ 2011)
J/ApJS/224/24 : The COSMOS2015 catalog (Laigle+, 2016)
Byte-by-byte Description of file: tablea2.dat
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Bytes Format Units Label Explanations
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1- 5 A5 --- AzTEC AzTEC designation
7- 12 I6 --- UVISTA UVISTA ID
14 A1 --- l_u+mag Limit flag on u+mag
15- 19 F5.2 mag u+mag ?=- COSMOS2015 u+ magnitude (AB)
21- 24 F4.2 mag e_u+mag ?=- rms uncertainty on u+ magnitude
25 A1 --- l_Bmag Limit flag on Bmag
26- 29 F4.1 mag Bmag ?=- COSMOS2015 B magnitude (AB)
31- 33 F3.1 mag e_Bmag ?=- rms uncertainty on B magnitude
36 A1 --- l_Vmag Limit flag on Vmag
37- 40 F4.1 mag Vmag ?=- COSMOS2015 V magnitude (AB)
42- 44 F3.1 mag e_Vmag ?=- rms uncertainty on V magnitude
46 A1 --- l_g+mag Limit flag on g+mag
47- 51 F5.2 mag g+mag ?=- COSMOS2015 g+ magnitude (AB)
53- 56 F4.2 mag e_g+mag ?=- rms uncertainty on g+ magnitude
58- 61 F4.1 mag r+mag ?=- COSMOS2015 r+ magnitude (AB)
63- 65 F3.1 mag e_r+mag ?=- rms uncertainty on r+ magnitude
67- 70 F4.1 mag i+mag ?=- COSMOS2015 i+ magnitude (AB)
72- 74 F3.1 mag e_i+mag ?=- rms uncertainty on i+ magnitude
76- 79 F4.1 mag z++mag ?=- COSMOS2015 z++ magnitude (AB)
81- 83 F3.1 mag e_z++mag ?=- rms uncertainty on z++ magnitude
85 A1 --- l_Ymag Limit flag on Ymag
86- 89 F4.1 mag Ymag ?=- UltraVISTA DR2 Y magnitude (AB)
91- 93 F3.1 mag e_Ymag ?=- rms uncertainty on Y magnitude
95 A1 --- l_Jmag Limit flag on Jmag
96-100 F5.2 mag Jmag ?=- UltraVISTA DR2 J magnitude (AB)
102-105 F4.2 mag e_Jmag ?=- rms uncertainty on J magnitude
107 A1 --- l_Hmag Limit flag on Hmag
108-112 F5.2 mag Hmag ?=- UltraVISTA DR2 H magnitude (AB)
114-117 F4.2 mag e_Hmag ?=- rms uncertainty on H magnitude
119-123 F5.2 mag Ksmag ?=- UltraVISTA DR2 Ks magnitude (AB)
125-128 F4.2 mag e_Ksmag ?=- rms uncertainty on Ks magnitude
130-134 F5.2 mag IRAC1 ?=- IRAC1 magnitude (AB)
136-139 F4.2 mag e_IRAC1 ?=- rms uncertainty on IRAC1 magnitude
141-146 F6.3 mag IRAC2 ?=- IRAC2 magnitude (AB)
148-152 F5.3 mag e_IRAC2 ?=- rms uncertainty on IRAC2 magnitude
154-158 F5.2 mag IRAC3 ?=- IRAC3 magnitude (AB)
160-163 F4.2 mag e_IRAC3 ?=- rms uncertainty on IRAC3 magnitude
166-169 F4.1 mag IRAC4 ?=- IRAC4 magnitude (AB)
171-173 F3.1 mag e_IRAC4 ?=- rms uncertainty on IRAC4 magnitude
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 06-Mar-2019