J/MNRAS/460/3861 Herschel protocluster survey (Kato+, 2016)
Herschel protocluster survey:
a search for dusty star-forming galaxies in protoclusters at z = 2-3.
Kato Y., Matsuda Y., Smail I., Swinbank A.M., Hatsukade B., Umehata H.,
Tanaka I., Saito T., Iono D., Tamura Y., Kohno K., Erb D.K., Lehmer B.D.,
Geach J.E., Steidel C.C., Alexander D.M., Yamada T., Hayashino T.
<Mon. Not. R. Astron. Soc., 460, 3861-3872 (2016)>
=2016MNRAS.460.3861K 2016MNRAS.460.3861K (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, galaxy ; Galaxy catalogs ; Redshifts
Keywords: galaxies: formation - galaxies: high-redshift - infrared: galaxies -
submillimetre: galaxies
Abstract:
We present a Herschel/Spectral and Photometric Imaging Receiver
(SPIRE) survey of three protoclusters at z=2-3 (2QZCluster, HS1700,
SSA22). Based on the SPIRE colours (S350/S250 and S500/S350)
of 250µm sources, we selected high-redshift dusty star-forming
galaxies potentially associated with the protoclusters. In the
2QZCluster field, we found a 4σ overdensity of six SPIRE sources
around 4.5-arcmin (∼2.2Mpc) from a density peak of H α emitters
at z=2.2. In the HS1700 field, we found a 5σ overdensity of
eight SPIRE sources around 2.1-arcmin (∼1.0Mpc) from a density peak of
Lyman-break galaxies at z=2.3. We did not find any significant
overdensities in SSA22 field, but we found three 500 µm sources are
concentrated 3-arcmin (∼1.4Mpc) east to the Ly α emitters
overdensity. If all the SPIRE sources in these three overdensities are
associated with protoclusters, the inferred star formation rate
densities are 103-104 times higher than the average value at the
same redshifts. This suggests that dusty star formation activity could
be very strongly enhanced in z∼2-3 protoclusters. Further observations
are needed to confirm the redshifts of the SPIRE sources and to
investigate what processes enhance the dusty star formation activity
in z∼2-3 protoclusters.
Description:
The observations were executed in Large Map mode with a scan rate of
30arcsec/s, repeated 14 times for each field (Nrep=14). The
dates of observations are 2012 June 22 (2QZCluster), 2012 March 4
(HS1700), and 2012 May 10 (SSA22). The coverage of the maps are
∼23-arcminx23-arcmin (2QZCluster), ∼22-arcminx22-arcmin (HS1700),
and ∼33-arcminx33-arcmin (SSA22) corresponding to ∼40-60 comoving Mpc
at the protocluster redshifts, which are sufficient to search for
concentration of DSFGs around the density peak of protocluster
members. The integration times are 1.8, 1.5, and 3.7h for 2QZCluster,
HS1700, and SSA22, respectively.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 91 399 SPIRE sources catalogue of 2QZCluster
table4.dat 91 383 SPIRE sources catalogue of HS1700
table5.dat 89 774 SPIRE sources catalogue of SSA22
table10.dat 124 7 Matching results for the SPIRE sources which
have HAEs counterparts in 2QZCluster
table11.dat 132 18 Matching results for the SPIRE sources which
have emitter counterparts within overdensity
in HS1700
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See also:
J/MNRAS/400/299 : Chandra deep protocluster survey (Lehmer+, 2009)
J/MNRAS/440/3462 : AzTEC/ASTE 1.1mm survey of SSA22 (Umehata+, 2014)
J/MNRAS/450/2615 : Spectroscopy of galaxies in the SSA22 field (Saez+, 2015)
Byte-by-byte Description of file: table?.dat
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Bytes Format Units Label Explanations
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1- 19 A19 --- Name SPIRE ID (1)
21- 38 F18.14 deg RAdeg Right ascension of SPIRE source (J2000)
40- 60 F21.18 deg DEdeg Declination of SPIRE source (J2000)
62- 66 F5.1 mJy S250 Flux density of Herschel/SPIRE 250um band
68- 70 F3.1 mJy e_S250 rms uncertainty on S250 (instrumental noise)
72- 76 F5.1 mJy S350 Flux density of Herschel/SPIRE 350um band
78- 80 F3.1 mJy e_S350 rms uncertainty on S350 (instrumental noise)
82- 85 F4.1 mJy S500 Flux density of Herschel/SPIRE 500um band
87- 89 F3.1 mJy e_S500 rms uncertainty on S500 (instrumental noise)
91 A1 --- Ctp [*] * indicates a counterpart in tables
10 or 11
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Note (1): Name as
2QZCluster-SPIRENNN in table3,
HS1700-SPIRENNN in table 4 and
SSA22-SPIRENNN in table5.
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Byte-by-byte Description of file: table10.dat
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Bytes Format Units Label Explanations
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1 A1 --- Flag [AC] Type of selection (G1)
3- 21 A19 --- Name SPIRE ID, 2QZCluster-SPIRENNN
23- 32 F10.6 deg RAdeg Right ascension of SPIRE source (J2000)
34- 41 F8.6 deg DEdeg Declination of SPIRE source (J2000)
43- 46 F4.1 mJy S250 Flux density of Herschel/SPIRE 250um band
48- 50 F3.1 mJy e_S250 rms uncertainty on S250 (instrumental noise)
52- 55 F4.1 mJy S350 Flux density of Herschel/SPIRE 350um band
57- 59 F3.1 mJy e_S350 rms uncertainty on S350 (instrumental noise)
61- 64 F4.1 mJy S500 Flux density of Herschel/SPIRE 500um band
66- 68 F3.1 mJy e_S500 rms uncertainty on S500 (instrumental noise)
70- 81 A12 --- Ctp Counterpart name (QZC-C1-HAENN)
82- 86 A5 --- n_Ctp Note on counterpart (QSO)
88- 97 F10.6 deg RAcdeg Counterpart right ascension (J2000)
99-106 F8.6 deg DEcdeg Counterpart declination (J2000)
108-111 F4.2 arcsec Sep Separation between SPIRE source and counterpart
113 A1 --- l_pvalue Limit flag on pvalue
114-117 F4.2 --- pvalue p-value based on
Downes et al. (1986MNRAS.218...31D 1986MNRAS.218...31D)
119-124 A6 --- Memb Membership code (G2)
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Byte-by-byte Description of file: table11.dat
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Bytes Format Units Label Explanations
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1 A1 --- Flag [ACF] Type of selection (G1)
3- 17 A15 --- Name SPIRE ID, HS1700-SPIRENNN
19- 26 F8.4 deg RAdeg Right ascension of SPIRE source (J2000)
28- 34 F7.4 deg DEdeg Declination of SPIRE source (J2000)
36- 39 F4.1 mJy S250 Flux density of Herschel/SPIRE 250um band
41- 43 F3.1 mJy e_S250 rms uncertainty on S250 (instrumental noise)
45- 48 F4.1 mJy S350 Flux density of Herschel/SPIRE 350um band
50- 52 F3.1 mJy e_S350 rms uncertainty on S350 (instrumental noise)
54- 57 F4.1 mJy S500 Flux density of Herschel/SPIRE 500um band
59- 61 F3.1 mJy e_S500 rms uncertainty on S500 (instrumental noise)
63- 69 A7 --- Ctp Counterpart name
71- 78 F8.4 deg RAcdeg Counterpart right ascension (J2000)
80- 86 F7.4 deg DEcdeg Counterpart declination (J2000)
88 A1 --- l_z [~] Limit flag on z
89- 93 F5.3 --- z ?=- Redshift information of counterparts
94-109 A16 --- n_z Note on z
110 A1 --- f_z [ef] Flag on z (3)
112-116 F5.2 arcsec Sep Separation between SPIRE source and counterpart
118 A1 --- l_pvalue Limit flag on pvalue
119-122 F4.2 --- pvalue p-value based on
Downes et al. (1986MNRAS.218...31D 1986MNRAS.218...31D)
124-132 A9 --- Mem Membership code (G2)
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Note (3): flag on z as follows:
e = BNB1 is identified as a "Lo-BAL" QSO and therefore it is difficult to
measure redshift.
f = photometric redshift from Chapman et al. (2015MNRAS.449L..68C 2015MNRAS.449L..68C)
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Glonal notes:
Note (G1): Type as follows:
C = Colour-selected bright SPIRE sources
A = At least one SPIRE band above 12 mJy sources
F = Colour-selected faint SPIRE sources
Note (G2): We classify sources with p≤0.05 as secure, and those with
0.05<p≤0.10 as tentative counterparts.
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 24-Nov-2017