J/A+A/668/A133 Deep 1.4GHz survey of the J1030 field (D'Amato+, 2022)
A deep 1.4 GHz survey of the J1030 equatorial field:
A new window on radio source populations across cosmic time.
D'Amato Q., Prandoni I., Gilli R., Vignali C., Massardi M., Liuzzo E.,
Jagannathan P., Brienza M., Paladino R., Mignoli M., Marchesi S., Peca A.,
Chiaberge M., Mazzolari G., Norman C.
<Astron. Astrophys. 668, A133 (2022)>
=2022A&A...668A.133D 2022A&A...668A.133D (SIMBAD/NED BibCode)
ADC_Keywords: Galaxy catalogs ; Radio sources
Keywords: surveys - catalogs - radio continuum: general - galaxies: active -
galaxies: evolution - galaxies: cluster
Abstract:
We present deep L-Band observations of the equatorial field centered
on the z=6.3 SDSS QSO, reaching a 1 sigma sensitivity of ∼2.5uJy at
the center of the field. We extracted a catalog of 1489 radio sources
down to a flux density of ∼12.5uJy (5 sigma) over a field of view of
∼30' diameter. We derived the source counts accounting for catalog
reliability and completeness, and compared them with others available
in the literature. Our source counts are among the deepest available
so far, and, overall, are consistent with recent counts'
determinations and models. We detected for the first time in the radio
band the SDSS J1030+0524 QSO (26±5uJy). We derived its optical radio
loudness RO=0.62±0.12, which makes it the most radio quiet AGN at
z≳6 discovered so far and detected at radio wavelengths. We unveiled
extended diffuse radio emission associated with the lobes of a bright
FRII radio galaxy located close to the center of the J1030 field,
which is likely to become the future BCG of a protocluster at z=1.7.
The lobes' complex morphology, coupled with the presence of X-ray
diffuse emission detected around the FRII galaxy lobes, may point
toward an interaction between the radio jets and the external medium.
We also investigated the relation between radio and X-ray luminosity
for a sample of 243 X-ray-selected objects obtained from 500 ks
Chandra observations of the same field, and spanning a wide redshift
range (0~<z~<3). Focused on sources with a spectroscopic redshift and
classification, we found that sources hosted by ETG and AGN follow
Log(LR)/Log(LX) linear correlations with slopes of ∼0.6 and ∼0.8,
respectively. This is interpreted as a likely signature of different
efficiency in the accretion process. Finally, we found that most of
these sources (≳87%) show a radio-to-X-ray radio loudness RX←3.5,
classifying these objects as radio quiet.
Description:
The catalog is extracted with the PyBDSF tool in a 30' diameter region
around the center of the J1030 field (RA=10:30:27, Dec=+05:24:55), at
the fitted peak brightness threshold S/N=5. The observations are
carried in the JVLA L-band (1-2GHz) with an affective frequency of
1.34GHz. The radial smearing at the edge of the field is 10%. The
beam has a major (minor) axis of 1.48 (1.15) arcsec. 43% of the
catalog sources can be reliably considered resolved. The noise level
at the center of the image is ∼2.5uJy/b, 50% of the field has a noise
level ≤3.4uJy/b, and the full area has noise level <5.5uJy/b. The
reliability and the completeness of the catalog at S/N=5 are ∼93% and
∼70%, respectively.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
j1030.dat 463 1489 Catalog
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See also:
J/A+A/637/A52 : Deep Chandra survey in J1030+0524 field (Nanni+, 2020)
J/A+A/656/A117 : Chandra J1030 Redshift identification (Marchesi+, 2021)
Byte-by-byte Description of file: j1030.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- ID [1/1489] Radio source identification number
6- 23 F18.14 deg RAdeg Right ascension (J2000) of the source
25- 46 E22.16 deg e_RAdeg Error of right ascension
48- 65 F18.16 deg DEdeg Declination (J2000) of the source
67- 88 E22.16 deg e_DEdeg Error of declination
90-110 F21.15 uJy S L-Band (1.34GHz) integrated total flux (1)
112-132 F21.16 uJy e_S Error of L-Band integrated total flux
134-154 F21.15 uJy/beam P L-Band (1.34GHz) peak brightness (1)
156-176 F21.16 uJy/beam e_P Error of L-Band peak brightness
178-196 F19.16 arcsec Maj Fitted major axis FWHM
198-219 F22.19 arcsec e_Maj Error of the fitted major axis FWHM
221-239 F19.16 arcsec Min Fitted minor axis FWHM
241-261 F21.19 arcsec e_Min Error of the fitted minor axis FWHM
263-283 F21.17 deg PA Fitted position angle (2)
285-307 F23.19 deg e_PA Error of the fitted position angle
309-328 F20.17 arcsec DCMaj ?=0 Deconvolved major axis FWHM
330-351 F22.19 arcsec e_DCMaj ?=0 Error of the deconvolved major axis FWHM
353-373 F21.18 arcsec DCMin ?=0 Deconvolved minor axis FWHM
375-395 F21.19 arcsec e_DCMin ?=0 Error of the deconvolved minor axis FWHM
397-417 F21.17 deg DCPA ?=0 Deconvolved position angle (2)
419-441 F23.19 deg e_DCPA ?=0 Error of the deconvolved position angle
443-461 F19.16 uJy/beam localrms Local noise at the source position
463 A1 --- Flag Source model flag (3)
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Note (1): The effective frequency of the observations is 1.34GHz.
Note (2): The position angle is defined positive from north to east
Note (3): Source model flag as follows:
S = Fitted by a single Gaussian component.
M = Fitted by multicomponent Gaussian model.
E = Extended sources with a complex morphology, that clearly can not be
described by the Gaussian fitting. Flux density and size of these
sources have been manually measured.
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Acknowledgements:
Quirino D'Amato, quirino.damato(at)gmail.com
(End) Patricia Vannier [CDS] 31-Oct-2022