J/A+A/655/A40 LoLSS-Deep Bootes 54MHz catalog (Williams+, 2021)
The LOFAR LBA Sky Survey: Deep Fields I. The Bootes Field.
Williams W.L., de Gasperin F., Hardcastle M.J., van Weeren R., Tasse C.,
Shimwell T.W., Best P.N., Bonato M., Bondi M., Brueggen M.,
Roettgering H.J.A., Smith D.J.B.
<Astron. Astrophys. 655, A40 (2021)>
=2021A&A...655A..40W 2021A&A...655A..40W (SIMBAD/NED BibCode)
ADC_Keywords: Radio continuum ; Radio sources ; Galaxies, radio ;
Active gal. nuclei
Keywords: techniques: interferometric - catalogs - surveys -
radio continuum: general - galaxies: active - galaxies: star formation
Abstract:
We present the first sub-mJy (∼0.7mJy/beam) survey to be completed
below 100 MHz, which is over an order of magnitude deeper than
previously achieved for widefield imaging of any field at these low
frequencies.
The high-resolution (15x15arcsec) image of the Bootes field at
34-75MHz is made from 56 hours of observation with the LOw Frequency
ARray (LOFAR) Low Band Antenna (LBA) system. We present a radio source
catalogue containing 1,948 sources detected over an area of 23.6 sq.
deg, with a peak flux density threshold of 5σ. Using the
available deep 144-MHz data, we identified 144-MHz counterparts to all
the 54-MHz sources, and produced a matched catalogue within the deep
optical coverage area containing 829 sources.
Description:
This catalogue provides the LBA deep survey data of the Bootes field
at 54MHz. The final 15arcsec resolution image, made from 56hrs of
observations, achieves an rms of 0.65mJy/beam in the central region,
and <1.2mJy/beam over 50 per cent of the map. The source catalogue
contains 1948 sources detected over an area of 23.6 square degrees.
The 829 sources within the deep optical coverage area are matched to
the HBA catalogue at 144MHz.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 176 1948 LBA deep survey data of the Bootes field at 54MHz
matched.dat 166 1788 Matched sources to the HBA catalogue at 144MHz
list.dat 143 1 Information on fits image
fits/* . 1 Fits image
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See also:
J/ApJ/793/82 : LOFAR Bootes and 3C295 field sources (van Weeren+, 2014)
J/MNRAS/460/2385 : Bootes field LOFAR 150-MHz observations (Williams+, 2016)
J/A+A/620/A74 : Bootes field deep LOFAR 150MHz imaging
(Retana-Montenegro+, 2018)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 25 A25 --- Source Source Name in format
LBABOOJhhmmss.ss+ddmmss.s
27- 34 F8.4 deg RAdeg Right ascension (J2000)
36- 44 F9.7 deg e_RAdeg Error on the right ascension
46- 53 F8.4 deg DEdeg Declination (J2000)
55- 63 F9.7 deg e_DEdeg Error on the declination
65- 73 F9.6 Jy Ftotal Integrated flux density at 54MHz
75- 84 F10.7 Jy e_Ftotal Error on the integrated flux density
86- 94 F9.6 Jy/beam Fpeak Peak brightness at 54MHz
(affected by smearing)
96-105 F10.7 Jy/beam e_Fpeak Error on the peak brightness
107-114 F8.6 Jy/beam Islrms Local rms noise
116-117 I2 --- Ngaus Number of Gaussian components
119-127 F9.7 deg DCMaj Deconvolved source size, major axis
129-138 F10.8 deg e_DCMaj Error on the deconvolved major axis size
140-148 F9.7 deg DCMin Deconvolved source size, minor axis
150-159 F10.8 deg e_DCMin Error on the deconvolved minor axis size
161-167 F7.3 deg DCPA Deconvolved position angle
169-176 F8.4 deg e_DCPA Error on the deconvolved position angle
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Byte-by-byte Description of file: matched.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 25 A25 --- Source Source name in format
LBABOOJhhmmss.ss+ddmmss.s
27- 34 F8.4 deg RAdeg Right ascension (J2000)
36- 44 F9.7 deg e_RAdeg Error on the right ascension
46- 53 F8.4 deg DEdeg Declination (J2000)
55- 63 F9.7 deg e_DEdeg Error on the declination
65- 73 F9.6 Jy Ftotal Integrated flux density at 54MHz
75- 84 F10.7 Jy e_Ftotal Error on the integrated flux density
86- 94 F9.6 Jy/beam Fpeak Peak brightness at 54MHz
(affected by smearing)
96-105 F10.7 Jy/beam e_Fpeak Error on the peak brightness
107-114 F8.6 Jy/beam Islrms Local rms noise
116-117 I2 --- Ngaus Number of Gaussian components
119-125 F7.3 deg Size Final source size
127-133 F7.3 deg Width Final source width
135-141 F7.3 deg Angle Final source position angle
143 I1 --- FlagOpt [0/1] Boolean flag indicating whether source
was within the deep optical coverage area
145-166 A22 --- HBADeep Name of matched 144MHz HBA Deep source
in format ILTJhhmmss.ss+ddmmss.s
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Byte-by-byte Description of file: list.dat
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Bytes Format Units Label Explanations
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1- 9 F9.5 deg RAdeg Right Ascension of center (J2000)
10- 18 F9.5 deg DEdeg Declination of center (J2000)
20- 23 I4 --- Nx Number of pixels along X-axis
25- 28 I4 --- Ny Number of pixels along Y-axis
30- 39 A10 "date" Obs.date Observation date
41- 46 F6.3 MHz Freq Observed frequency
48- 53 I6 Kibyte size Size of FITS file
55-112 A58 --- FileName Name of FITS file, in subdirectory fits
114-143 A30 --- Title Title of the FITS file
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Acknowledgements:
Wendy Williams, wwilliams(at)strw.leidenuniv.nl
(End) Patricia Vannier [CDS] 15-Oct-2021