J/MNRAS/440/3462 AzTEC/ASTE 1.1mm survey of SSA22 (Umehata+, 2014)
AzTEC/ASTE 1.1-mm survey of SSA22: Counterpart identification and photometric
redshift survey of submillimetre galaxies.
Umehata H., Tamura Y., Kohno K., Hatsukade B., Scott K.S., Kubo M.,
Yamada T., Ivison R.J., Cybulski R., Aretxaga I., Austermann J.,
Hughes D.H., Ezawa H., Hayashino T., Ikarashi S., Iono D., Kawabe R.,
Matsuda Y., Matsuo H., Nakanishi K., Oshima T., Perera T., Takata T.,
Wilson G.W., Yun M.S.
<Mon. Not. R. Astron. Soc., 440, 3462-3478 (2014)>
=2014MNRAS.440.3462U 2014MNRAS.440.3462U
ADC_Keywords: Galaxies, photometry ; Photometry, millimetric/submm; Redshifts
Keywords: galaxies: distances and redshifts - galaxies: formation -
galaxies: high-redshift - large-scale structure of Universe -
submillimetre: galaxies
Abstract:
We present the results from a 1.1-mm imaging survey of the SSA22
field, known for having an overdensity of z=3.1 Lymanα
emitting galaxies (LAEs), taken with the astronomical thermal emission
camera (AzTEC) on the Atacama Submillimeter Telescope Experiment
(ASTE). We imaged a 950-arcmin2 field down to a 1σ sensitivity
of 0.7-1.3mJy/beam to find 125 submillimetre galaxies (SMGs) with a
signal-to-noise ratio ≥3.5. Counterpart identification using radio
and near/mid-infrared data was performed and one or more counterpart
candidates were found for 59 SMGs. Photometric redshifts based on
optical to near-infrared images were evaluated for 45 of these SMGs
with Spitzer/IRAC data and the median value is found to be z=2.4. By
combining these estimations with estimates from the literature, we
determined that 10 SMGs might lie within the large-scale structure at
z=3.1. The two-point angular cross-correlation function between LAEs
and SMGs indicates that the positions of the SMGs are correlated with
the z=3.1 protocluster. These results suggest that the SMGs were
formed and evolved selectively in the high dense environment of the
high-redshift Universe. This picture is consistent with the
predictions of the standard model of hierarchical structure formation.
Description:
We used the AzTEC camera operating at 1.1mm mounted on the ASTE 10-m
submillimetre telescope located at Pampa la Bola, near Cerro
Chajnantor in northern Chile.
All of the AzTEC/ASTE observations of SSA22 were carried out at night
during 2007 August-September and 2008 August-September.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 91 125 The AzTEC/ASTE SSA22 source catalog
table3.dat 50 17 Supplementary catalogue of AzTEC SMGs detected
in the edge (10-30 percent coverage) region
table5.dat 86 83 Information about identified counterparts
table7.dat 47 66 Redshifts of identified counterparts
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See also:
J/MNRAS/400/299 : Chandra deep protocluster survey in SSA22 (Lehmer+, 2009)
J/ApJ/725/394 : High-redshift Lyα emitters (Hu+, 2010)
J/ApJ/736/18 : Lyman-continuum emission at z∼3 in SSA22 field (Nestor+ 2011)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 5 A5 --- --- [AzTEC]
7- 25 A19 --- AzTEC AzTEC name (JHHMMSS.ss+DDMMSS.s)
27- 37 A11 --- --- [SSA22-AzTEC-]
38- 40 I3 --- ID [1/125] Name of SSA22-AzTEC source, NNN
42- 43 I2 h RAh Right ascension (J2000)
45- 46 I2 min RAm Right ascension (J2000)
48- 52 F5.2 s RAs Right ascension (J2000)
54 A1 --- DE- Declination sign (J2000)
55- 56 I2 deg DEd Declination (J2000)
58- 59 I2 arcmin DEm Declination (J2000)
61- 64 F4.1 arcsec DEs Declination (J2000)
66- 69 F4.1 mJy S1.1 [2/12] Observed 1.1mm flux density
71- 73 F3.1 mJy e_S1.1 [0.7/1.3] rms uncertainty on S1.1
75- 78 F4.1 mJy S1.1D [0/12] Deboosted 1.1mm to noise ratio of
the detection in the AzTEC map
80- 82 F3.1 mJy E_S1.1D Error on S1.1D
(upper value, 68% confidence level)
84- 86 F3.1 mJy e_S1.1D Error on S1.1D
(lower value, 68% confidence level)
88- 91 F4.1 --- S/N [3.5/16.2] Signal to noise ratio of the
detection in the AzTEC map
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 15 A15 --- --- [SSA22-AzTEC Sup-]
16- 17 I2 --- ID [1/17] Name of SSA22-AzTEC-Sup source, NN
19- 20 I2 h RAh Right ascension (J2000)
22- 23 I2 min RAm Right ascension (J2000)
25- 29 F5.2 s RAs Right ascension (J2000)
31 A1 --- DE- Declination sign (J2000)
32- 33 I2 deg DEd Declination (J2000)
35- 36 I2 arcmin DEm Declination (J2000)
38- 41 F4.1 arcsec DEs Declination (J2000)
43- 46 F4.1 mJy S1.1 [5/11] Observed 1.1mm flux density
48- 50 F3.1 --- S/N [3.5/6.6] Signal to noise ratio of the
detection in the AzTEC map
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- --- [SSA22-Az-]
9- 11 I3 --- ID [1/125] Name of SSA22-AzTEC source, NNN
12 A1 --- Ctp [abcd] Counterpart identification
13 A1 --- n_ID [*] * indicates robust counterparts
15- 18 F4.1 arcsec Rs Radius of the 2 σ positional error circle
estimated by Monte Carlo simulations
20- 38 A19 --- Rctp Radio counterpart coordinate (VLA 1.4GHz)
JHHMMSS.ss+DDMMSS.s
40- 43 F4.1 arcsec Rdist ?=- Positional offset of radio counterpart
from the AzTEC position
45- 63 A19 --- Sctp Spitzer counterpart coordinate,
JHHMMSS.ss+DDMMSS.s (1)
65- 68 F4.1 arcsec Sdist ?=- Positional offset of Spitzer counterpart
from the AzTEC position
70- 74 F5.3 --- p.R ?=- Corrected Poisson probability (p-value) of
chance association for radio counterpart
76- 80 F5.3 --- p.S ?=- Corrected Poisson probability (p-value) of
chance association from Spitzer/MIPS 24um
82- 86 F5.3 --- p.Sc ?=- Corrected Poisson probability (p-value) of
chance association from IRAC color
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Note (1): The Spitzer coordinate shows the coordinate of IRAC 3.6um as
priority. If counterparts were selected by only MIPS, the MIPS 24um
coordinates are shown.
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Byte-by-byte Description of file: table7.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- --- [SSA22-Az-]
9- 11 I3 --- ID [1/125] Name of SSA22-AzTEC source, NNN
12 A1 --- Ctp [abcd] Counterpart identification
14- 17 F4.2 --- zph [0/6]?=- Derived photometric redshift, based
on optical to near-infrared data
19- 22 F4.2 --- E_zph ?=- 68% confidence level error on zph
(upper value)
24- 27 F4.2 --- e_zph ?=- 68% confidence level error on zph
(lower value)
28 A1 --- n_zph [a] Note on zph (1)
30- 34 F5.3 --- zsp [2.2/3.2]?=- Spectroscopic redshift
35 A1 --- n_zsp [bcd] Note on zsp (1)
37- 39 F3.1 --- zph2 [1.7/2.1]?=- Photometric redshift, evaluated
using 1.1mm and radio fluxes (2)
41- 43 F3.1 --- E_zph2 ?=- 68% confidence level error on zph2
(upper value)
45- 47 F3.1 --- e_zph2 ?=- 68% confidence level error on zph2
(lower value)
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Note (1): Notes as follows:
a = for SSA22-Az1a, zph = 3.19+0.26-0.35 in
Tamura et al. (2010ApJ...724.1270T 2010ApJ...724.1270T)
b = Alaghband-Zadeh et al. (2012MNRAS.424.2232A 2012MNRAS.424.2232A)
c = Chapman et al. (2005ApJ...622..772C 2005ApJ...622..772C, Cat. J/ApJ/622/772)
d = Matsuda et al. (2005ApJ...634L.125M 2005ApJ...634L.125M)
Note (2): We had not calculated redshifts for SSA22-Az106a and SSA22-Az110a, as
these were clearly radio-loud AGN and it was difficult to apply the code.
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History:
* 23-Apr-2015: From electronic version of the journal
* 28-Apr-2016: Robust counterparts flag added in table5
(End) Patricia Vannier [CDS] 29-Jan-2015