J/ApJ/784/9 SCUBA-2 high-redshift galaxies sample (Barger+, 2014)
Is there a maximum star formation rate in high-redshift galaxies?
Barger A.J., Cowie L.L., Chen C.-C., Owen F.N., Wang W.-H., Casey C.M.,
Lee N., Sanders D.B., Williams J.P.
<Astrophys. J., 784, 9 (2014)>
=2014ApJ...784....9B 2014ApJ...784....9B (SIMBAD/NED BibCode)
ADC_Keywords: Galaxy catalogs ; Photometry, millimetric/submm ;
Photometry, infrared ; Redshifts ; Radio sources
Keywords: cosmology: observations - galaxies: active -
galaxies: distances and redshifts - galaxies: evolution -
galaxies: high-redshift - galaxies: starburst
Abstract:
We use the James Clerk Maxwell Telescope's SCUBA-2 camera to image a
400 arcmin2 area surrounding the GOODS-N field. The 850 µm rms
noise ranges from a value of 0.49 mJy in the central region to 3.5 mJy
at the outside edge. From these data, we construct an 850 µm source
catalog to 2 mJy containing 49 sources detected above the 4σ
level. We use an ultradeep (11.5 µJy at 5σ) 1.4 GHz image
obtained with the Karl G. Jansky Very Large Array together with
observations made with the Submillimeter Array to identify
counterparts to the submillimeter galaxies. For most cases of multiple
radio counterparts, we can identify the correct counterpart from new
and existing Submillimeter Array data. We have spectroscopic redshifts
for 62% of the radio sources in the 9' radius highest sensitivity
region (556/894) and 67% of the radio sources in the GOODS-N region
(367/543). We supplement these with a modest number of additional
photometric redshifts in the GOODS-N region (30). We measure
millimetric redshifts from the radio to submillimeter flux ratios for
the unidentified submillimeter sample, assuming an Arp 220 spectral
energy distribution. We find a radio-flux-dependent K-z relation for
the radio sources, which we use to estimate redshifts for the
remaining radio sources. We determine the star formation rates (SFRs)
of the submillimeter sources based on their radio powers and their
submillimeter fluxes and find that they agree well. The radio data are
deep enough to detect star-forming galaxies with SFRs>2000 M☉/yr
to z∼6. We find galaxies with SFRs up to ∼6000 M☉/yr over the
redshift range z=1.5-6, but we see evidence for a turn-down in the
SFR distribution function above 2000 M☉/yr.
Description:
We obtained 25.4 hr of observations on the CDF-N with SCUBA-2 on the
JCMT during observing runs in 2012 and 2013. The data were obtained
using a mixture of scanning modes and under a variety of weather
conditions. Using the CV Daisy scanning mode (detailed information
about the SCUBA-2 scan patterns can be found in Holland et al.
2013MNRAS.430.2513H 2013MNRAS.430.2513H), we obtained a 2.2 hr observation in band 1 weather
(225 GHz opacity<0.05) and a 16.5 hr observation in band 2 weather
(225 GHz opacity ∼0.05-0.08). We also obtained a 6.7 hr observation
in band 2 weather using the pong-900 scanning mode. While SCUBA-2
observes at both 450 um and 850 um simultaneously, there are too
few sources directly detected at 450 um in our data to be interesting.
Thus, we only use the 850 um data in our subsequent analysis.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 135 56 SCUBA-2 Sample
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See also:
J/MNRAS/358/149 : HDFN SCUBA Super-map. III (Pope+, 2005)
J/ApJ/653/1004 : Galaxies at 1.4≲z≲3.0 in GOODS-North Field (Reddy+, 2006)
J/ApJ/653/1027 : TKRS/GOODS-N Field galaxies (Weiner+, 2006)
J/ApJ/742/3 : Photometric catalogs for ECDF-S and CDF-N (Rafferty+, 2011)
J/MNRAS/436/430 : SCUBA-2 cosmology legacy survey (Roseboom+, 2013)
J/MNRAS/436/1919 : SCUBA observations of COSMOS galaxies (Casey+, 2013)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 4 A4 --- --- [CDFN]
5- 6 I2 --- CDFN [1/49] Source identifier
8- 19 A12 --- OName Other source identifier (1)
21- 22 I2 h RAh SCUBA-2 Hour of Right Ascension (J2000)
24- 25 I2 min RAm SCUBA-2 Minute of Right Ascension (J2000)
27- 31 F5.2 s RAs SCUBA-2 Second of Right Ascension (J2000)
33- 34 I2 deg DEd SCUBA-2 Degree of Declination (J2000)
36- 37 I2 arcmin DEm SCUBA-2 Arcminute of Declination (J2000)
39- 43 F5.2 arcsec DEs SCUBA-2 Arcsecond of Declination (J2000)
45- 49 F5.2 mJy F850 ? SCUBA-2 Flux density at 850 microns
51- 54 F4.2 mJy e_F850 ? Error in F850
56- 60 F5.2 --- S/N ? Signal-to-Noise ratio in SCUBA-2 850 microns
image
62 A1 --- Comp [ab] SMA component designation
64- 67 F4.1 mJy F860 ? SMA 860 microns flux density
69- 71 F3.1 mJy e_F860 ? The 1σ error in F860
73 A1 --- l_F1.4 [<] Limit flag on F1.4
74- 79 F6.2 uJy F1.4 Flux density at 1.4 GHz
81- 84 F4.1 uJy e_F1.4 ? Error in F1.4
86- 87 I2 h RARh ? Radio Hour of Right Ascension (J2000)
89- 90 I2 min RARm ? Radio Minute of Right Ascension (J2000)
92- 97 F6.3 s RARs ? Radio Second of Right Ascension (J2000)
98 A1 --- DER- Radio Sign of Declination (J2000)
99-100 I2 deg DERd ? Radio Degree of Declination (J2000)
102-103 I2 arcmin DERm ? Radio Arcminute of Declination (J2000)
105-109 F5.2 arcsec DERs ? Radio Arcsecond of Declination (J2000)
111-115 F5.2 mag Ksmag ? The KS band AB magnitude
117-121 F5.3 --- zspec ? Spectroscopic redshift; including CO
123-127 F5.3 --- zphot ? Photometric redshift
129 A1 --- f_zphot [R] Flag on zphot (2)
131-135 F5.3 --- zmilli ? Millimetric redshift
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Note (1): A GOODS 850 number from Wang et al. (2004ApJ...613..655W 2004ApJ...613..655W), 850-NN,
[WCB2004] GOODS 850-NN in Simbad or a GN number from Pope et al.
(2005, J/MNRAS/358/149), GNNN, [PBS2005] GNNN in Simbad.
Note (2): Flag as follows:
R = Indicates a photometric redshift from Rafferty et al. (2011, J/ApJ/742/3)
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History:
From electronic version of the journal
(End) Prepared by [AAS], Tiphaine Pouvreau [CDS] 31-May-2017