J/MNRAS/444/117 Luminous (sub-)millimetre galaxies (Koprowski+, 2014)
A reassessment of the redshift distribution and physical properties of
luminous (sub-)millimetre galaxies.
Koprowski M.P., Dunlop J.S., Michalowski M.J., Cirasuolo M., Bowler R.A.A.
<Mon. Not. R. Astron. Soc., 444, 117-128 (2014)>
=2014MNRAS.444..117K 2014MNRAS.444..117K
ADC_Keywords: Galaxies, photometry ; Photometry, infrared ;
Photometry, millimetric/submm ; Photometry, SDSS
Keywords: galaxies: active - galaxies: evolution - galaxies: high-redshift -
galaxies: starburst - cosmology: observations -
submillimetre: galaxies
Abstract:
Motivated by the current controversy over the redshift distribution
and physical properties of luminous (sub-)mm sources, we have
undertaken a new study of the brightest sample of unlensed (sub-)mm
sources with pre-Atacama Large Millimeter/submillimeter Array (ALMA)
interferometric follow-up in the Cosmological Evolution Survey field.
Exploiting the very latest multifrequency supporting data, we find
that this sample displays a redshift distribution indistinguishable
from that of the lensed sources uncovered with the South Pole
Telescope, with zmedian≃3.5. We also find that, over the redshift
range z≃2-6, the median stellar mass of the most luminous (sub-) mm
sources is M*≃ 3x1011M☉, yielding a typical specific star
formation rate sSFR≃3Gyr-1. Consistent with recent ALMA and the
Submillimeter Array studies, we confirm that source blending is not a
serious issue in the study of luminous (sub-)mm sources uncovered by
ground-based, single-dish surveys; only ≃10-15% of bright
(S850≃5-10mJy) (sub-) mm sources arise from significant (i.e. >20%)
blends, and so our conclusions are largely unaffected by whether we
adopt the original single-dish mm/sub-mm flux densities/positions or
the interferometric data. Our results suggest that apparent
disagreements over the redshift distribution of (sub-)mm sources are a
result of 'down-sizing' in dust-enshrouded star formation, consistent
with existing knowledge of the star formation histories of massive
galaxies. They also indicate that extreme star-forming galaxies at
high redshift are, on average, subject to the same star formation
rate-limiting processes as less luminous objects, and lie on the 'main
sequence' of star-forming galaxies at z>3.
Description:
The AzTEC/COSMOS survey covers 0.15deg2 of the COSMOS field at 1.1mm
with an rms noise of 1.3mJy/beam (Scott et al., 2008MNRAS.385.2225S 2008MNRAS.385.2225S,
Cat. J/MNRAS/385/2225). The published AzTEC/COSMOS catalogue consists
of 44 sources with S/N≥3.5σ.
The LABOCA/COSMOS survey covers the inner ∼0.7deg2 of the COSMOS
field, delivering a submillimetre map at λ=870um with an rms
noise level of 1.5mJy/beam (Navarrete et al., in preparation).
The 28 brightest 870um sources were chosen for Institut de
Radioastronomie Millimetrique (IRAM) PdBI follow-up observations with
the requirement that the signal-to-noise S/NLABOCA ≳3.8 (Smolcic et
al., 2012A&A...548A...4S 2012A&A...548A...4S).
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 103 21 The results of our attempt to establish galaxy
identifications for the (sub-)mm sources based
on statistical associations between the original
single-dish (sub-)mm positions and potential
counterparts in the multi-wavelength imaging
table2.dat 181 16 Optical CFHTLS, near-infrared UltraVISTA and IRAC
AB magnitudes with errors calculated using 2"
diameter aperture measurements corrected to
'total' using the relevant on-image PSF.
table3.dat 180 2 Optical Subaru, near-infrared UltraVISTA and IRAC
AB magnitudes with errors calculated using 2"
diameter aperture measurements corrected to
'total' using the relevant on-image PSF
--------------------------------------------------------------------------------
See also:
J/MNRAS/385/2225 : AzTEC millimetre survey of COSMOS field (Scott+, 2008)
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 9 A9 --- Name Galaxy name (AzTECNN or COSLA-NNN)
10 A1 --- n_Name [*] Confirmed galaxy (1)
12- 20 F9.5 deg RAdeg Right ascension (J2000) (2)
22- 28 F7.5 deg DEdeg Declination (J2000) (2)
30- 32 F3.1 arcsec offset [0.1/8] Distance from this position and the
original single-dish (sub-)mm source position
34 A1 --- l_Kmag Limit flag on Kmag
35- 39 F5.2 mag Kmag VISTA Ks-band magnitude (AB system)
41- 44 F4.2 mag i-K ?=- i-K colour index (AB system)
46 A1 --- l_p(i-K) Limit flag on p(i-K)
47- 51 F5.3 --- p(i-K) [0/1]?=- probability that the counterpart could
have been found by chance for K,i-K method (3)
53- 56 F4.1 uJy S8 ?=- Flux density from Spitzer/IRAC 8.0µm
58- 60 F3.1 uJy e_S8 ? rms uncertainty on S8
62 A1 --- l_p(S8) Limit flag on p(S8)
63- 67 F5.3 -- p(S8) [0/1]?=- probability that the counterpart could
have been found by chance for 8um method (3)
69- 73 F5.3 mJy S24 ?=- Flux density from Spitzer/MIPS 24µm
75- 79 F5.3 mJy e_S24 ?=- rms uncertainty on S24
81- 85 F5.3 --- p(S24) [0/1]?=- probability that the counterpart could
have been found by chance for 24um method (3)
87- 91 F5.3 mJy S1.4 ?=- VLA radio 1.4GHz flux density
93- 97 F5.3 mJy e_S1.4 ?=- rms uncertainty on SVLA
99-103 F5.3 --- p(vla) [0/1]?=- probability that the counterpart could
have been found by chance for VLA method (3)
--------------------------------------------------------------------------------
Note (1): * indicate the 16 sources for which the identification chosen here is
confirmed as correct by the improved positional accuracy provided by the SMA
and PdBI interferometric observations. COSLA-23 (as identified in the LABOCA
map) was matched to an object close to the position of COSLA-23N (as
identified by PdBI). No significant association was found with COSLA-23S.
Note (2): position of the K-band counterpart (except in the case of AzTEC2
where the position refers to the radio counterpart).
Note (3): For each method the probability that the counterpart could have been
found by chance is given by the significance level p: see Dunlop et al. 1989,
(J/MNRAS/238/1171); Ivison et al. 2007, (J/MNRAS/380/199).
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 9 A9 --- Name Name (AzTECNN or COSLA-NNN)
11- 19 F9.5 deg RAdeg Rigth ascension (J2000)
21- 27 F7.5 deg DEdeg Declination (J2000)
29 A1 --- l_umag 2σ limit flag on umag
30- 34 F5.2 mag umag CFHTLS u magnitude (AB system)
36- 39 F4.2 mag e_umag ? 1σ rms uncertainty on umag
41 A1 --- l_gmag 2σ limit flag on gmag
42- 46 F5.2 mag gmag CFHTLS g magnitude (AB system)
48- 51 F4.2 mag e_gmag ? 1σ rms uncertainty on gmag
53 A1 --- l_rmag 2σ limit flag on rmag
54- 58 F5.2 mag rmag CFHTLS r magnitude (AB system)
60- 63 F4.2 mag e_rmag ? 1σ rms uncertainty on rmag
65 A1 --- l_imag 2σ limit flag on imag
66- 70 F5.2 mag imag CFHTLS i magnitude (AB system)
72- 75 F4.2 mag e_imag ? 1σ rms uncertainty on imag
77 A1 --- l_zmag 2σ limit flag on zmag
78- 82 F5.2 mag zmag CFHTLS z magnitude (AB system)
84- 87 F4.2 mag e_zmag ? 1σ rms uncertainty on zmag
89 A1 --- l_Ymag 2σ limit flag on Ymag
90- 94 F5.2 mag Ymag VISTA Y magnitude from UltraVISTA (AB system)
96- 99 F4.2 mag e_Ymag ? 1σ rms uncertainty on Ymag
101 A1 --- l_Jmag 2σ limit flag on Jmag
102-106 F5.2 mag Jmag VISTA J magnitude from UltraVISTA (AB system)
108-111 F4.2 mag e_Jmag ? 1σ rms uncertainty on Jmag
113 A1 --- l_Hmag 2σ limit flag on Hmag
114-118 F5.2 mag Hmag VISTA H magnitude from UltraVISTA (AB system)
120-123 F4.2 mag e_Hmag ? 1σ rms uncertainty on Hmag
125 A1 --- l_Ksmag 2σ limit flag on Ksmag
126-130 F5.2 mag Ksmag VISTA Ks magnitude from UltraVISTA (AB system)
132-135 F4.2 mag e_Ksmag ? 1σ rms uncertainty on Ksmag
137-141 F5.2 mag [3.6] Spitzer/IRAC 3.6µm magnitude (AB system)
143-146 F4.2 mag e_[3.6] ? 1σ rms uncertainty on [3.6]
148-152 F5.2 mag [4.5] Spitzer/IRAC 4.5µm magnitude (AB system)
154-157 F4.2 mag e_[4.5] ? 1σ rms uncertainty on [4.5]
159 A1 --- l_[5.8] 2σ limit flag on [5.8]
160-164 F5.2 mag [5.8] Spitzer/IRAC 5.8µm magnitude (AB system)
166-169 F4.2 mag e_[5.8] ? 1σ rms uncertainty on [5.8]
171 A1 --- l_[8.0] 2σ limit flag on [8.0]
172-176 F5.2 mag [8.0] Spitzer/IRAC 8.0µm magnitude (AB system)
178-181 F4.2 mag e_[8.0] ? 1σ rms uncertainty on [8.0]
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 9 A9 --- Name Name (AzTECNN)
10- 18 F9.5 deg RAdeg Rigth ascension (J2000)
20- 26 F7.5 deg DEdeg Declination (J2000)
28- 32 F5.2 mag Bjmag Subaru Bj magnitude (AB system)
34- 37 F4.2 mag e_Bjmag 1σ rms uncertainty on Bjmag
39- 43 F5.2 mag g+mag Subaru g+ magnitude (AB system)
45- 48 F4.2 mag e_g+mag 1σ rms uncertainty on g+mag
50- 54 F5.2 mag Vjmag Subaru Vj magnitude (AB system)
56- 59 F4.2 mag e_Vjmag 1σ rms uncertainty on Vjmag
61- 65 F5.2 mag r+mag Subaru r+ magnitude (AB system)
67- 70 F4.2 mag e_r+mag 1σ rms uncertainty on r+mag
72- 76 F5.2 mag i+mag Subaru i+ magnitude (AB system)
78- 81 F4.2 mag e_i+mag 1σ rms uncertainty on i+mag
83- 87 F5.2 mag z+mag Subaru z+ magnitude (AB system)
89- 92 F4.2 mag e_z+mag 1σ rms uncertainty on z+mag
94- 98 F5.2 mag Ymag VISTA Y magnitude from UltraVISTA (AB system)
100-103 F4.2 mag e_Ymag 1σ rms uncertainty on Ymag
105-109 F5.2 mag Jmag VISTA J magnitude from UltraVISTA (AB system)
111-114 F4.2 mag e_Jmag 1σ rms uncertainty on Jmag
116-120 F5.2 mag Hmag VISTA H magnitude from UltraVISTA (AB system)
122-125 F4.2 mag e_Hmag 1σ rms uncertainty on Hmag
127-131 F5.2 mag Ksmag VISTA Ks magnitude from UltraVISTA (AB system)
133-136 F4.2 mag e_Ksmag 1σ rms uncertainty on Ksmag
138-142 F5.2 mag [3.6] Spitzer/IRAC 3.6µm magnitude (AB system)
144-147 F4.2 mag e_[3.6] 1σ rms uncertainty on [3.6]
149-153 F5.2 mag [4.5] Spitzer/IRAC 4.5µm magnitude (AB system)
155-158 F4.2 mag e_[4.5] 1σ rms uncertainty on [4.5]
160-164 F5.2 mag [5.8] Spitzer/IRAC 5.8µm magnitude (AB system)
166-169 F4.2 mag e_[5.8] 1σ rms uncertainty on [5.8]
171-175 F5.2 mag [8.0] Spitzer/IRAC 8.0µm magnitude (AB system)
177-180 F4.2 mag e_[8.0] 1σ rms uncertainty on [8.0]
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 23-Apr-2015