2017A&A...597A...4S


Query : 2017A&A...597A...4S

2017A&A...597A...4S - Astronomy and Astrophysics, volume 597A, 4-4 (2017/1-1)

(Sub)millimetre interferometric imaging of a sample of COSMOS/AzTEC submillimetre galaxies. III. Environments.

SMOLCIC V., MIETTINEN O., TOMICIC N., ZAMORANI G., FINOGUENOV A., LEMAUX B.C., ARAVENA M., CAPAK P., CHIANG Y.-K., CIVANO F., DELVECCHIO I., ILBERT O., JURLIN N., KARIM A., LAIGLE C., LE FEVRE O., MARCHESI S., McCRACKEN H.J., RIECHERS D.A., SALVATO M., SCHINNERER E., TASCA L. and TOFT S.

Abstract (from CDS):

We investigate the environment of 23 submillimetre galaxies (SMGs) drawn from a signal-to-noise (S/N)-limited sample of SMGs originally discovered in the James Clerk Maxwell Telescope (JCMT)/AzTEC 1.1mm continuum survey of a Cosmic Evolution Survey (COSMOS) subfield and then followed up with the Submillimetre Array and Plateau de Bure Interferometer at 890µm and 1.3mm, respectively. These SMGs already have well-defined multiwavelength counterparts and redshifts. We also analyse the environments of four COSMOS SMGs spectroscopically confirmed to lie at redshifts zspec>4.5, and one at zspec=2.49 resulting in a total SMG sample size of 28. We search for overdensities using the COSMOS photometric redshifts based on over 30 UV-NIR photometric measurements including the new UltraVISTA data release 2 and Spitzer/SPLASH data, and reaching an accuracy of σΔz/(1+z)=0.0067(0.0155) at z<3.5(>3.5). To identify overdensities we apply the Voronoi tessellation analysis, and estimate the redshift-space overdensity estimator δg as a function of distance from the SMG and/or overdensity centre. We test and validate our approach via simulations, X-ray detected groups or clusters, and spectroscopic verifications using VUDS and zCOSMOS catalogues which show that even with photometric redshifts in the COSMOS field we can efficiently retrieve overdensities out to z~=5. Our results yield that 11 out of 23 (48%) JCMT/AzTEC 1.1 mm SMGs occupy overdense environments. Considering the entire JCMT/AzTEC 1.1mm S/N≥4 sample and taking the expected fraction of spurious detections into account, this means that 35-61% of the SMGs in the S/N-limited sample occupy overdense environments. We perform an X-ray stacking analysis in the 0.5-2keV band using a 32'' aperture and our SMG positions, and find statistically significant detections. For our z<2 subsample we find an average flux of (4.0±0.8)x10–16erg/s/cm2 and a corresponding total mass of M200=2.8x1013M. The z>2 subsample yields an average flux of (1.3±0.5)x10–16erg/s/cm2 and a corresponding total massof M200=2x1013M. Our results suggest a higher occurrence of SMGs occupying overdense environments at z≥3 than at z<3. This may be understood if highly star-forming galaxies can only be formed in the highest peaks of the density field tracing the most massive dark matter haloes at early cosmic epochs, while at later times cosmic structure may have matured sufficiently that more modest overdensities correspond to sufficiently massive haloes to form SMGs.

Abstract Copyright: © ESO, 2016

Journal keyword(s): galaxies: clusters: general - galaxies: evolution - galaxies: formation - large-scale structure of Universe - submillimeter: galaxies

Simbad objects: 46

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Number of rows : 46
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 NAME Extended Chandra Deep Field South reg 03 32 30.0 -27 48 20           ~ 677 0
2 4C 41.17 rG 06 50 52.098 +41 30 30.53           ~ 321 1
3 [AWA2011] AzTEC/C159 mm 09 59 29.75 +01 55 35.4           ~ 12 0
4 AzTEC J095930.76+024033.9 G 09 59 30.76 +02 40 33.9           ~ 9 0
5 AzTEC J095931.57+023601.5 G 09 59 31.399 +02 36 04.61           ~ 6 0
6 AzTEC 4 G 09 59 31.700 +02 30 43.96           ~ 17 0
7 [MSN2015] AzTEC17b mm 09 59 38.904 +02 34 04.69           ~ 3 0
8 [MNS2015] J095939.19+023403.58 Rad 09 59 39.190 +02 34 03.58           ~ 6 0
9 AzTEC J095939.30+023408.0 smm 09 59 39.30 +02 34 08.0           ~ 7 0
10 AzTEC J095943.04+023540.2 G 09 59 42.607 +02 35 36.96           ~ 6 0
11 AzTEC 1 G 09 59 42.860 +02 29 38.20           ~ 51 0
12 AzTEC J095950.29+024416.1 G 09 59 50.069 +02 44 24.50           ~ 6 0
13 AzTEC 9 G 09 59 57.290 +02 27 30.54   27.5 26.8     ~ 16 0
14 AzTEC J095959.33+023445.8 smm 09 59 59.33 +02 34 45.8           ~ 20 0
15 [MSN2015] AzTEC26a mm 09 59 59.386 +02 38 15.36           ~ 3 0
16 AzTEC J095959.59+023818.5 smm 09 59 59.59 +02 38 18.5           ~ 6 0
17 [MSN2015] AzTEC21a mm 10 00 02.558 +02 46 41.74           ~ 3 0
18 [MSN2015] AzTEC21b mm 10 00 02.710 +02 46 44.51           ~ 3 0
19 AzTEC J100002.74+024645.0 smm 10 00 02.74 +02 46 45.0           ~ 6 0
20 AzTEC 2 smm 10 00 08.05 +02 26 12.2           ~ 21 0
21 COSMOSMAMBO MM J100008+021304 mm 10 00 08.9 +02 13 04           ~ 4 0
22 AzTEC 11 PaG 10 00 08.91 +02 40 10.2           ~ 16 0
23 AzTEC 14 PaG 10 00 10.00 +02 30 20.0           ~ 4 0
24 AzTEC J100013.21+023428.2 G 10 00 12.950 +02 34 34.92           ~ 14 0
25 [MNS2015] J100018.06+024830.43 G 10 00 18.060 +02 48 30.43 25.99 25.49 24.86 24.70 24.22 ~ 12 0
26 NAME AK03 EmG 10 00 18.82 +02 28 14.2   27.409 26.901     ~ 10 0
27 AzTEC 5 rG 10 00 19.74 +02 32 04.3     25.3     ~ 30 0
28 AzTEC 3 G 10 00 20.690 +02 35 20.37           ~ 86 0
29 [MSN2015] AzTEC29b mm 10 00 26.561 +02 38 05.14           ~ 3 0
30 AzTEC J100026.68+023753.7 smm 10 00 26.68 +02 37 53.7           ~ 5 0
31 NAME COSMOS Field reg 10 00 28.60 +02 12 21.0           ~ 2391 0
32 COSMOS2015 813176 G 10 00 28.720 +02 32 03.68           ~ 9 0
33 AzTEC J100028.94+023200.3 smm 10 00 28.94 +02 32 00.3           ~ 7 0
34 [MSN2015] AzTEC19b mm 10 00 29.256 +02 32 09.82           ~ 3 0
35 AzTEC 12 G 10 00 35.300 +02 43 53.27   26.3 25.4     ~ 16 0
36 COSMOS 2328516 G 10 00 54.52 +02 34 35.2   27.842       ~ 22 0
37 [BCA2007] VLA J100056.34+020839.1 mm 10 00 56.5 +02 08 41           ~ 3 0
38 COSMOSMAMBO MM J100057+022013 mm 10 00 57.2 +02 20 13           ~ 35 0
39 NAME Vd-17871 EmG 10 01 27.080 +02 08 55.90     26.74 25.44 25.02 ~ 15 0
40 NAME Spiderweb Galaxy AGN 11 40 48.3 -26 29 09     22.00     ~ 258 1
41 NAME SMM J123652+621225 G 12 36 51.73 +62 12 21.2 24.2 23.4 22.3 22.0 25.80 ~ 178 1
42 NAME GOODS-N Field reg 12 36 55.0 +62 14 15           ~ 993 1
43 [PSD2006] GN20.2a G 12 37 08.840 +62 22 02.37     25.150     ~ 42 0
44 6C 171301+501842 Sy2 17 14 14.8 +50 15 31   24.05   22.64   ~ 107 1
45 ClG J2215-1738 ClG 22 15 58.5 -17 38 03           ~ 94 0
46 SSA 22 reg 22 17 34.7 +00 15 07           ~ 292 0

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2021.11.29-03:54:35

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