J/MNRAS/525/5311 Bootes field source catalogue at 400MHz (Sinha+, 2023)
Detailed study of the Bootes field using 300-500 MHz uGMRT observations:
source properties and radio-infrared correlations.
Sinha A., Datta A.
<Mon. Not. R. Astron. Soc. 525, 5311 (2023)>
=2023MNRAS.525.5311S 2023MNRAS.525.5311S (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, IR ; Galaxies, radio ; Morphology
Keywords: galaxies: active - galaxies: ISM - infrared: galaxies -
radio continuum: galaxies
Abstract:
The dominant source of radio continuum emissions at low frequencies is
synchrotron radiation, which originates from star-forming regions in
disc galaxies and from powerful jets produced by active galactic
nuclei (AGNs). We studied the Bootes field using the upgraded Giant
Meterwave Radio Telescope at 400MHz, achieving a central minimum
off-source rms noise of 35Jy/beam and a catalogue of 3782 sources in
∼6deg2 of the sky. The resulting catalogue was compared to other
radio frequency catalogues, and the corrected normalized differential
source counts were derived. We use standard multiwavelength techniques
to classify the sources in star-forming galaxies (SFGs), radio-loud
AGNs, and radio-quiet (RQ) AGNs that confirm a boost in the SFG and RQ
AGN populations at lower flux levels. For the first time, we
investigated the properties of the radio-infrared (IR) relations at
400MHz in this field. The L400MHz-LTIR relations for SFGs were found
to show a strong correlation with non-linear slope values of
1.10±0.01, and variation of qTIR with z is given as
qTIR=(2.19±0.07)(1+z)-0.15±0.08. This indicates that the
non-linearity of the radio-IR relations can be attributed to the
mild variation of qTIR values with z. The derived relationships
exhibit similar behaviour when applied to Low-Frequency Array at
150MHz and also at 1.4GHz. This emphasizes the fact that other
parameters like magnetic field evolution with z or the number
densities of cosmic ray electrons can play a vital role in the mild
evolution of q values.
Description:
We used archival data of the Bootes field (RA2000=14:31:45,
DE2000=34:28:27) observed using uGMRT in the GTAC cycle 35
(Project-code: 35_048). These observations are centred at 400MHz with
a total bandwidth of 200MHz. The total observation time is 30h (∼23h
on-source) with roughly 3h for each of the seven pointing. The field
was observed for a total of four days between 2019 February 3 and
March 15.
We compiled a total of 3782 sources at 400MHz within 20 per cent of
uGMRT primary beam above 5σ threshold and flux densities >175Jy.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
catalog.dat 217 3782 Bootes field source catalogue at 400MHz from uGMRT
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See also:
J/ApJS/161/9 : X-ray survey of the NDWFS Bootes field (Kenter+, 2005)
J/A+A/535/A38 : Observations of NOAO Bootes field at 153MHz (Intema+, 2011)
J/ApJ/793/82 : LOFAR Bootes and 3C295 field sources (van Weeren+, 2014)
J/MNRAS/450/1477 : VLA 352MHz image of the Bootes field. I. (Coppejans+, 2015)
J/MNRAS/460/2385 : Bootes field LOFAR 150-MHz observations (Williams+, 2016)
J/ApJ/817/119 : Spitzer/IRAC variability survey of Bootes field
(Kozlowski+, 2016)
J/A+A/620/A74 : Bootes field deep LOFAR 150MHz imaging
(Retana-Montenegro+, 2018)
J/A+A/653/A74 : Bootes field X-ray/non-X-ray sources (Mountrichas+, 2021)
J/A+A/655/A40 : LoLSS-Deep Bootes 54MHz catalog (Williams+, 2021)
J/MNRAS/515/2032 : LoTSS Bootes Deep Field Giant Radio Galaxies
(Simonte+, 2022)
J/A+A/676/A37 : Bootes field Apertif 1.4 GHz continuum obs. (Kutkin+, 2023)
Byte-by-byte Description of file: catalog.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- Id [0/3849] Sequential number
6- 23 F18.14 deg RAdeg Right ascension (J2000)
25- 45 E21.16 deg e_RAdeg Right ascension error
47- 64 F18.15 deg DEdeg Declination (J2000)
66- 86 E21.16 deg e_DEdeg Declination error
88-108 F21.17 mJy Ftot Total flux at 400MHz
110-130 F21.17 mJy/beam Fpeak Peak flux at 400MHz
132-152 F21.19 deg Maj Major axis
154-174 F21.19 deg Min Minor axis
176-196 F21.17 deg PA Position angle
198-217 F20.18 mJy/beam rms rms noise
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Acknowledgements:
Akriti Sinha, sinha.akriti44(at(at)gmail.com
(End) Patricia Vannier [CDS] 23-Sep-2023