J/ApJ/909/193 The 1.266GHz MeerKAT DEEP2 component catalog (Matthews+, 2021)
Source counts spanning eight decades of flux density at 1.4GHz.
Matthews A.M., Condon J.J., Cotton W.D., Mauch T.
<Astrophys. J., 909, 193 (2021)>
=2021ApJ...909..193M 2021ApJ...909..193M
ADC_Keywords: Galaxies, radio; Radio sources
Keywords: Galaxy evolution ; Galaxy counts ; Star formation ;
Radio galaxies
Abstract:
Brightness-weighted differential source counts S2n(S) spanning the
eight decades of flux density between 0.25µJy and 25Jy at 1.4GHz
were measured from (1) the confusion brightness distribution in the
MeerKAT DEEP2 image below 10µJy, (2) counts of DEEP2 sources
between 10µJy and 2.5mJy, and (3) counts of NVSS sources stronger
than 2.5mJy. We present our DEEP2 catalog of 1.7x104 discrete
sources complete above S=10µJy over Ω=1.04deg2. The
brightness-weighted counts converge as S2n(S)∝S1/2 below
S=10µJy, so >99% of the ΔTb∼0.06K sky brightness produced
by active galactic nuclei and ∼96% of the ΔTb∼0.04K added by
star-forming galaxies has been resolved into sources with
S≥0.25µJy. The ΔTb∼0.4K excess brightness measured by
ARCADE 2 cannot be produced by faint sources smaller than ∼50kpc if
they cluster like galaxies.
Description:
The 1.266GHz DEEP2 image (Mauch+ 2020ApJ...888...61M 2020ApJ...888...61M) covers the
Θ1/2=69.2' diameter half-power circle of the South African
Radio Astronomy Observatory's (SARAO) MeerKAT array primary beam
centered on RAJ2000=04:13:26.4s, DEJ2000=-80:00:00. Its point-source
response is a Θ1/2=7.6" full width at half maximum (FWHM)
Gaussian, and the rms noise is σn=0.56±0.01µJy/beam at
the pointing center.
The wideband DEEP2 image is the average of 14 narrow subband images
(with central frequency from 908.010 to 1656.2MHz) weighted to
maximize the signal-to-noise ratio (S/N) of sources with spectral
index α=-0.7.
In this work, we presented source counts in the eight decades of flux
density from S=0.25uJy to S=25Jy using the MeerKAT DEEP2 field and
archival NVSS data.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 69 17350 The 1.266GHz DEEP2 component catalog
table4.dat 36 35 DEEP2 multicomponent sources (section 5.3)
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See also:
VIII/65 : 1.4GHz NRAO VLA Sky Survey (NVSS) (Condon+ 1998)
J/AJ/77/405 : Intense radio sources at 1400MHz (BDFL set) (Bridle+, 1972)
J/AJ/125/465 : Phoenix Deep Survey 1.4-GHz microJy Catalog (Hopkins+, 2003)
J/AJ/132/1729 : HUDF BVI-dropout sources (Beckwith+, 2006)
J/AJ/136/1889 : 20cm observations of deep Swire Field (Owen+, 2008)
J/ApJS/188/178 : VLA 1.4GHz obs. of GOODS-North field (Morrison+, 2010)
J/A+A/602/A1 : VLA-COSMOS 3 GHz Large Project (Smolcic+, 2017)
J/ApJ/856/67 : VLA 3GHz radio sources in the Lockman Hole (Cotton+, 2018)
J/ApJS/235/34 : Deep JVLA imaging of GOODS-N at 20cm (Owen, 2018)
J/MNRAS/481/4548 : Constraints on the 1.4GHz source counts (Prandoni+, 2018)
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 2 I2 h RAh [4] Hour of Right Ascension (J2000)
4- 5 I2 min RAm [0/26] Minute of Right Ascension (J2000)
7- 12 F6.3 s RAs Second of Right Ascension (J2000)
14- 18 F5.3 s eRA [0.04/0.3] 68% confidence uncertainty in RA
20- 20 A1 --- DE- [-] Sign of the Declination (J2000)
21- 22 I2 deg DEd [79/80] Degree of Declination (J2000)
24- 25 I2 arcmin DEm Arcminute of Declination (J2000)
27- 31 F5.2 arcsec DEs Arcsecond of Declination (J2000)
33- 36 F4.2 arcsec eDE [0.12/0.62] 68% confidence uncertainty in DEC
38- 44 F7.1 uJy S1.266 [10/32280] 1.266GHz flux density
46- 51 F6.1 uJy e_S1.266 [1/1162] 68% confidence uncertainty in S1.266
53- 55 A3 --- Group Multicomponent source group label (G01 to G35)
57- 62 F6.1 pix PixX [501.4/3815.7] X-coordinate pixel number
in DEEP2 image
64- 69 F6.1 pix PixY [501.5/3816.2] Y-coordinate pixel number
in DEEP2 image
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 3 A3 --- Group Multicomponent source group label (G01 to G35)
5- 6 I2 --- Nc [3/18] Number of group components
8- 9 I2 h RAh [4/4] Hour of Right Ascension (J2000)
11- 12 I2 min RAm [0/26] Minute of Right Ascension (J2000)
14- 18 F5.2 s RAs Second of Right Ascension (J2000)
20- 20 A1 --- DE- [-] Sign of the Declination (J2000)
21- 22 I2 deg DEd [79/80] Degree of Declination (J2000)
24- 25 I2 arcmin DEm Arcminute of Declination (J2000)
27- 30 F4.1 arcsec DEs Arcsecond of Declination (J2000)
32- 36 I5 uJy Stot [159/54268] Total 1.266GHz flux density
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 11-Aug-2022