J/MNRAS/469/4565 Overdensities of submm-galaxies around AGNs (Jones+, 2017)
Overdensities of SMGs around WISE-selected, ultraluminous, high-redshift AGNs.
Jones S.F., Blain A.W., Assef R.J., Eisenhardt P., Lonsdale C., Condon J.,
Farrah D., Tsai C.-W., Bridge C., Wu J., Wright E.L., Jarrett T.
<Mon. Not. R. Astron. Soc., 469, 4565-4577 (2017)>
=2017MNRAS.469.4565J 2017MNRAS.469.4565J (SIMBAD/NED BibCode)
ADC_Keywords: Active gal. nuclei ; Infrared sources ; Redshifts
Keywords: galaxies: active - galaxies: clusters: general -
galaxies: high-redshift - quasars: general - infrared: galaxies -
submillimetre: galaxies
Abstract:
We investigate extremely luminous dusty galaxies in the environments
around Wide-field Infrared Survey Explorer (WISE)-selected hot
dust-obscured galaxies (Hot DOGs) and WISE/radio-selected active
galactic nuclei (AGNs) at average redshifts of z=2.7 and 1.7,
respectively. Previous observations have detected overdensities of
companion submillimetre-selected sources around 10 Hot DOGs and 30
WISE/radio AGNs, with overdensities of ∼2-3 and ∼5-6, respectively. We
find that the space densities in both samples to be overdense compared
to normal star-forming galaxies and submillimetre galaxies (SMGs) in
the Submillimetre Common-User Bolometer Array 2 (SCUBA-2) Cosmology
Legacy Survey (S2CLS). Both samples of companion sources have
consistent mid-infrared (mid-IR) colours and mid-IR to submm ratios as
SMGs. The brighter population around WISE/radio AGNs could be
responsible for the higher overdensity reported. We also find that the
star formation rate densities are higher than the field, but
consistent with clusters of dusty galaxies. WISE-selected AGNs appear
to be good signposts for protoclusters at high redshift on arcmin
scales. The results reported here provide an upper limit to the
strength of angular clustering using the two-point correlation
function. Monte Carlo simulations show no angular correlation, which
could indicate protoclusters on scales larger than the SCUBA-2
1.5-arcmin scale maps.
Description:
JCMT SCUBA-2 observations of Hot DOGs and WISE/radio AGNs were in the
'CV DAISY' mode that produces a uniformly deep coverage 3-arcmin
diameter map (Holland et al., 2013MNRAS.430.2513H 2013MNRAS.430.2513H). 17 companion
sources were detected at 3σ significance or above in 10 JCMT
SCUBA-2 fields of Hot DOGs reported by Jones et al.
(2014MNRAS.443..146J 2014MNRAS.443..146J) with an average root mean square (rms) noise of
1.8mJy/beam, as shown in table1.dat.
81 companion sources were detected at 3σ or greater significance
in 30 WISE/radio-selected AGN fields reported by Jones et al.
(2015MNRAS.448.3325J 2015MNRAS.448.3325J) with average rms noise of 2.1mJy/beam, see
tab2-5.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 131 17 Coordinates and photometry of the 17 companion SMG
sources found around 10 Hot DOGs
tab2-5.dat 131 81 *Coordinates and photometry of the 81 companion SMG
sources found around 30 WISE/radio AGNs
table6.dat 27 40 *SFRDs of Hot DOGs (top 10) and WISE/radio AGNs
(bottom 30) and their surrounding SMGs, assuming
that they are at the same redshift
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Note on tab2-5.dat: No Herschel, NVSS, FIRST data and no objects found in SIMBAD
for all the 81 companion SMG sources.
Note on table6.dat: The angular radius is estimated to be the size of the
SCUBA-2 map, 1.5 arcmin.
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See also:
II/328 : AllWISE Data Release (Cutri+, 2013)
J/ApJ/805/90 : WISE ELIRGs and comparison with QSOs (Tsai+, 2015)
Byte-by-byte Description of file: table1.dat tab2-5.dat
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Bytes Format Units Label Explanations
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1- 12 A12 --- Name Source name (WHHMM+DDMM_N)
13 A1 --- n_Name [ab] Note on Name (1)
15- 16 I2 h RAh Right ascension (J2000)
18- 19 I2 min RAm Right ascension (J2000)
21- 26 F6.3 s RAs Right ascension (J2000)
28 A1 --- DE- Declination sign (J2000)
29- 30 I2 deg DEd Declination (J2000)
32- 33 I2 arcmin DEm Declination (J2000)
35- 39 F5.2 arcsec DEs Declination (J2000)
41- 42 I2 arcsec Dist Distance to the WISE target
44 I1 arcsec e_Dist ? rms uncertainty on Dist
46- 64 A19 --- WISE ALLWISE name (JHHMMSS.ss+DDMMSS.s) (2)
66- 71 F6.3 mag [3.4] ? WISE magnitude at 3.4um
73- 77 F5.3 mag e_[3.4] ? rms uncertainty on WISE magnitude at 3.4um
79 A1 --- l_[3.4] Limit flag on [3.4]
80- 85 F6.3 mag [4.6] ? WISE magnitude at 4.6um
87- 91 F5.3 mag e_[4.6] ? rms uncertainty on WISE magnitude at 4.6um
93 A1 --- l_[12] Limit flag on [12]
94- 99 F6.3 mag [12] ? WISE magnitude at 12um
101-105 F5.3 mag e_[12] ? rms uncertainty on WISE magnitude at 12um
107 A1 --- l_[22] Limit flag on [22]
108-112 F5.3 mag [22] ? WISE magnitude at 22um
114-117 F4.1 mag [850] ? SCUBA-2 magnitude at 850um
119-121 F3.1 mag e_[850] ? rms uncertainty on SCUBA-2 magnitude
at 850um
123-125 F3.1 --- SNR Signal-to-noise ratio (3)
127-130 F4.2 mJy/beam FR ? First/NVSS detection limit flux (4)
131 A1 --- n_FR [U] U for undetected (4)
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Note (1): Note as follows:
a = Subset of these Hot DOGs have been reported by
Tsai et al. (2015, Cat. J/ApJ/805/90)
b = Subset of these Hot DOGs have been reported by
Eisenhardt et al. (2012ApJ...755..173E 2012ApJ...755..173E)
Note (2): blank when WISE undetected.
Note (3): The targets with WISE upper limits have SNR <2 and therefore in the
AllWISE Source Catalog the magnitudes quoted are 2σ upper limits.
Note (4): FIRST detection limit for each source position is given in mJy/beam, U
for undetected represents that there is no FIRST coverage or NVSS detection.
A search radius of 8 arcsec was used, which is a typical search radius of SMG
counterparts (Hainline et al., 2009, Cat. J/ApJ/699/1610).
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Byte-by-byte Description of file: table6.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- Source Source name (WHHMM+DDMM)
12- 16 I5 Msun/yr/Mpc SFRD Star formation rate density
18- 20 I3 Msun/yr/Mpc e_SFRD rms uncertainty on SFRD
22- 26 F5.3 --- z ? Redshift (1)
27 A1 --- n_z [U] U for Unknown
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Note (1): The spectroscopically known redshifts of the WISE-selected targets are
shown. The unknown redshifts of the WISE/radio AGNs are assumed to the average
of WISE/radio AGNs, z=1.7.
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 18-Apr-2020