J/A+A/690/A196 RAdio Galaxy Environment Reference Survey (Zhou+, 2024)
The RAdio Galaxy Environment Reference Survey (RAGERS):
Evidence of an anisotropic distribution of submillimeter galaxies in the
4C 23.56 protocluster at z = 2.48.
Zhou D., Greve T.R., Gullberg B., Lee M., Di Mascolo L., Dicker S.R.,
Romero C.E., Chapman S.C., Chen C.-C., Cornish T., Devlin M.J., Ho L.C.,
Kohno K., Lagos C.D.P., Mason B.S., Mroczkowski T., Wagg J.F.W., Wang Q.D.,
Wang R., Brinch M., Dannerbauer H., Jiang X.-J., Lauritsen L.R.B.,
Vijayan A.P., Vizgan D., Wardlow J.L., Sarazin C.L., Sarmiento K.P.,
Serjeant S., Bhandarkar T.A., Haridas S.K., Moravec E., Orlowski-Scherer J.,
Sievers J.L.R., Tanaka I., Wang Y.-J., Zeballos M., Laza-Ramos A., Liu Y.,
Hassan M.S.R., Jwel A.K.M., Nazri A., Lim M.K., Ibrahim U.F.S.
<Astron. Astrophys. 690, A196 (2024)>
=2024A&A...690A.196Z 2024A&A...690A.196Z (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, galaxy ; Galaxies, radio ; Millimetric/submm sources ;
Redshifts
Keywords: galaxies: clusters: general - cosmology: observations -
submillimeter: galaxies
Abstract:
High-redshift radio(-loud) galaxies (HzRGs) are massive galaxies with
powerful radio-loud active galactic nuclei (AGNs) and serve as
beacons for protocluster identification. However, the interplay
between HzRGs and the large-scale environment remains unclear.
To understand the connection between HzRGs and the surrounding
obscured star formation, we investigated the overdensity and spatial
distribution of submillimeter-bright galaxies (SMGs) in the field of
4C 23.56, a well-known HzRG at z=2.48.
We used SCUBA-2 data (σ∼0.6mJy) to estimate the 850um source
number counts and examine the radial and azimuthal overdensities of
the 850um sources in the vicinity of the HzRG.
The angular distribution of SMGs is inhomogeneous around the HzRG
4C 23.56, with fewer sources oriented along the radio jet. We also
find a significant overdensity of bright SMGs (S850um≥5mJy). Faint
and bright SMGs exhibit different spatial distributions. The former
are concentrated in the core region, while the latter prefer the
outskirts of the HzRG field. High-resolution observations show that
the seven brightest SMGs in our sample are intrinsically bright,
suggesting that the overdensity of bright SMGs is less likely due to
the source multiplicity.
Description:
The SCUBA-2 850um observations for this study were conducted
between August 22, 2012, and June 3, 2016 (Program IDs JCMT-LR,
M12BU39, M15AI146, and M15BI053), under good weather conditions
(τ225GHz<0.07). The total exposure times for the "Pong900" and
"CV Daisy" scan patterns are ∼7 hours and ∼10 hours, respectively.
Table A1 show 850um the source catalog (S/N≥4σ) with fluxes
and uncertainties before and after de-boosting.
Table B1 lists the photometric redshifts determined by the MMPz code
(Casey 2020). It includes the corresponding FIR catalog with SPIRE,
AzTEC, and MUSTANG-2 photometry.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 47 50 Positions and fluxes of the 850um-selected SMGs
(S/N≥4σ)
tableb1.dat 77 50 De-boosted photometry and redshift estimation
from MMPz
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Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- ID [1/50] Galaxy identification number
4- 11 F8.5 deg RAdeg Right ascension (J2000)
13- 19 F7.4 deg DEdeg Declination (J2000)
21- 24 F4.1 mJy F850 Observed SCUBA-2 flux density at 850um
26- 28 F3.1 mJy e_F850 Error on SCUBA-2 flux density at 850um
(combined 1σ uncertainty)
30- 33 F4.1 --- S/N Signal-to-noise ratio at 850um
35- 38 F4.2 --- D Deboosting factor
40- 43 F4.1 mJy F850D Deboosted SCUBA-2 flux density at 850um
45- 47 F3.1 mJy e_F850D Error on deboosted SCUBA-2 flux density
at 850um (combined 1σ uncertainty)
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Byte-by-byte Description of file: tableb1.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- ID [1/50] Galaxy identification number
4- 8 F5.1 deg F250 SPIRE flux density at 250um
10- 12 F3.1 deg e_F250 Error on SPIRE flux density at 250um
14- 18 F5.1 mJy F350 SPIRE flux density at 350um
20- 22 F3.1 mJy e_F350 Error on SPIRE flux density at 350um
24- 28 F5.1 mJy F500 SPIRE flux density at 500um
30- 32 F3.1 mJy e_F500 Error on SPIRE flux density at 500um
34- 37 F4.1 mJy F850 SCUBA-2 flux density at 850um
39- 41 F3.1 mJy e_F850 Error on SCUBA-2 flux density at 850um
43- 46 F4.1 mJy F1100 AzTEC flux density at 1100um
48- 50 F3.1 mJy e_F1100 Error on AzTEC flux density at 1100um
52- 56 F5.3 mJy F3300 ? MUSTANG-2 flux density at 3300um
58- 62 F5.3 mJy e_F3300 ? Error on MUSTANG-2 flux density at 3300um
64- 67 F4.2 --- zph Photometry redshift estimate
69- 72 F4.2 --- E_zph Upper uncertainty in photometry redshift
74- 77 F4.2 --- e_zph Lower uncertainty in photometry redshift
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Acknowledgements:
Dazhi Zhou, dodgie.chou(at)gmail.com
(End) Patricia Vannier [CDS] 06-Aug-2024