J/A+A/457/517 ATESP 5 GHz radio survey. I. (Prandoni+, 2006)
The ATESP 5 GHz radio survey. I. Source counts and spectral index properties of
the faint radio population.
Prandoni I., Parma P., Wieringa M.H., De Ruiter H.R., Gregorini L.,
Mignano A., Vettolani G., Ekers R.D.
<Astron. Astrophys., 457, 517-529 (2006)>
=2006A&A...457..517P 2006A&A...457..517P
ADC_Keywords: Radio sources ; Morphology
Keywords: surveys - radio continuum: general - methods: data analysis -
catalogs - galaxies: general - galaxies: evolution
Abstract:
The nature and evolutionary properties of the faint radio population,
responsible for the steepening observed in the 1.4GHz source counts
below 1mJy, are not yet entirely clear. Radio spectral indices may
help to constrain the origin of the radio emission in such faint radio
sources and may be fundamental in understanding eventual links to the
optical light.
We study the spectral index behaviour of sources that were found in
the 1.4GHz ATESP survey (Prandoni et al., 2000A&AS..146...31P 2000A&AS..146...31P & 2000,
Cat. VIII/63), considering that the ATESP is one of the most
extensive sub-mJy surveys existing at present. Using the Australia
Telescope Compact Array we observed at 5GHz part of the region covered
by the sub-mJy ATESP survey. In particular we imaged a one square
degree area for which deep optical imaging in UBVRIJK is available. In
this paper we present the 5GHz survey and source catalogue, we derive
the 5GHz source counts and we discuss the 1.4-5GHz spectral index
properties of the ATESP sources. The analysis of the optical
properties of the sample will be the subject of a following paper.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table4.dat 57 131 1.4-5GHz spectral index of ATESP sources
table6.dat 145 123 The 5GHz catalogue
list.dat 113 2 List of fits images
fits/* . 2 Individual fits images
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See also:
VIII/63 : ATESP radio survey. II. (Prandoni+, 2000)
Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 14 A14 --- ATESP5 5GHz IAU name (JHHMMSS+DDMMSS)
16- 29 A14 --- ATESP 1.4GHz IAU name (JHHMMSS+DDMMSS, Cat. VIII/63)
31 A1 --- l_S5GHz Limit flag on S5GHz
32- 36 F5.2 mJy S5GHz Flux density at 5GHz
38 A1 --- l_S1.4GHz Limit flag on S1.4GHz
39- 43 F5.2 mJy S1.4GHz Flux density at 1.4GHz
45 A1 --- l_alpha Limit flag on alpha
46- 51 F6.3 --- alpha 1.4-5GHz spectral index
53- 57 F5.3 --- e_alpha ? rms uncertainty on alpha
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Byte-by-byte Description of file: table6.dat
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Bytes Format Units Label Explanations
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1- 6 A6 --- --- [ATESP5]
8- 21 A14 --- ATESP5 ATESP5 IAU name
22 A1 --- m_ATESP5 [AB] Multiplicity index on ATESP5
24- 25 I2 h RALh ? Right ascension (J2000) Low resolution
27- 28 I2 min RALm ? Right ascension (J2000), Low resolution
30- 34 F5.2 s RALs ? Right ascension (J2000), Low resolution
36 A1 --- DEL- Declination sign (J2000), Low resolution
37- 38 I2 deg DELd ? Declination (J2000), Low resolution
40- 41 I2 arcmin DELm ? Declination (J2000), Low resolution
43- 46 F4.1 arcsec DELs ? Declination (J2000), Low resolution
48- 52 F5.2 mJy SpL ? 5GHz peak flux density, Low resolution
54- 58 F5.2 mJy StotL ? 5GHz integrated flux density, Low resolution
60- 64 F5.2 arcsec MajL ? FWHM of major axis, Low resolution
66- 70 F5.2 arcsec MinL ? FWHM of minor axis, Low resolution
72- 76 F5.1 deg PAL [-180/180]? Position angle, Low resolution (1)
78- 79 A2 --- f_PAL [EM S*] Flag on PA, Low resolution (2)
81- 82 I2 uJy sigmaL ? Local noise level used for the source
detection, Low resolution
84- 85 I2 h RAFh ? Right ascension (J2000), Full resolution
87- 88 I2 min RAFm ? Right ascension (J2000), Full resolution
90- 94 F5.2 s RAFs ? Right ascension (J2000), Full resolution
96 A1 --- DEF- Declination sign (J2000), Full resolution
97- 98 I2 deg DEFd ? Declination (J2000), Full resolution
100-101 I2 arcmin DEFm ? Declination (J2000), Full resolution
103-106 F4.1 arcsec DEFs ? Declination (J2000), Full resolution
107 A1 --- l_SpF Limit flag on SpeakF
108-112 F5.2 mJy SpF ? 5GHZ peak flux density, Full resolution
114-118 F5.2 mJy StotF ? 5GHZ integrated flux density, Full resolution
120-124 F5.2 arcsec MajF ? FWHM major axis, Full resolution
126-129 F4.2 arcsec MinF ? FWHM minor axis, Full resolution
131-135 F5.1 deg PAF [-180/180]? Position angle, Full resolution (1)
137-138 A2 --- f_PAF [EMDU S*] Flag on PAF, Full resolution (2)
140-141 A2 --- n_PAF [a-i ] Flag (3)
143-145 I3 uJy sigmaF ? Local noise level used for the source
detection, Full resolution
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Note (1): Source position angle (PA, measured N through E) for the major axis
Note (2): Flags as follows:
E = non-Gaussian sources
M = multiple sources
S = Gaussian fits
D = sources with peak flux 3sigmal≤Speak<6sigmal
U = undetected sources
S* = poor Gaussian fits
DE = sources with peak flux 3sigmal≤Speak<6sigmal, non-Gaussian
Note (3): Flag as follows:
a = Component B split in two sub-components.
b = Hints of multiple structure
c = Almost resolved out
d = Source split in two components
e = Extended structure resolved out
f = Extended tail resolved out
g = Hints of double structure
h = Hints of a possible core between components
i = Double structure catalogued as single extended source
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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- 50 A21 --- Obs.Date Observation date (YYYY/MM/DDThh:mm:ss.s)
52- 58 F7.5 GHz Freq Observed frequency
60- 64 I5 Kibyte size Size of FITS file
66- 79 A14 --- FileName Name of FITS file, in subdirectory fits
81-113 A33 --- Title Title of the FITS file
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History:
* 18-Jun-2007: From electronic version of the journal
* 06-Sep-2018: fits images from by Isabella Prandoni, via
Heinz Andernach (heinz(at)astro.ugto.mx)
(End) Patricia Vannier [CDS] 30-Apr-2007