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J/A+AS/77/31 Survey at 408 MHz and 1420 MHz towards A 1314 (Vallee+, 1989)
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Radio surveys and source counts at 408 MHz and 1420 MHz towards the Abell
1314 cluster of galaxies
Vallee J.P., Roger R.S.
<Astron. Astrophys. Suppl. Ser. 77, 31 (1989)>
=1989A&AS...77...31V (SIMBAD/NED BibCode)
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ADC_Keywords: Radio sources ; Clusters, galaxy
Keywords: radio surveys - radio sources - source counts - cosmology -
clusters of galaxies
Description:
The cluster of galaxies Abell 1314 has been observed with the
Penticton synthesis telescope simultaneously at 408 MHz (73.5 cm
wavelength) with a sensitivity (7 rms) near 70 mJy and at 1420 MHz
(21.1 cm wavelength) with a sensitivity (5 rms) near 4.3 mJy. In
addition to the 3 cluster sources detected, a further 64 background
radio sources have been detected at 1420 MHz (the 20P radio survey),
and 169 background sources at 408 MHz (the 21P radio survey). The
surveys extend to a radius of 3.7 degrees at 408 MHz, and to 1.0
degree at 1420 MHz, from the map center at RA=11h31.5m, Dec=+49d20'.
The differential source count for the background radio sources,
derived at 408 MHz in the flux density range 90 mJy to 3.0 Jy, shows
consistency with the Cambridge 5C5 survey at 408 MHz in a direction
away from clusters of galaxies. Also, the differential count derived
at 1420 MHz in the flux density range 10 mJy to 330 mJy is consistent
with the Westerbork LBDS survey at a nearby frequency away from
clusters of galaxies. We find no candidate for very steep spectrum
"relic" sources in this cluster of galaxies, nor for very flat
spectrum "blue" background radio galaxies behind the cluster.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2 61 169 Source List at 408 MHz, corrected for a
primary beam with Gaussian function of HPBW
of 318 arcmin
table3 61 65 Source List at 1420 MHz, corrected for a
primary beam of Gaussian function of HPBW
of 103 arcmin
table4 38 4 Size of extended sources at 408 MHz
table5 61 14 Comparison table for sources in both lists
(408 and 1420 MHz)
table6 56 13 Source counts at three frequencies toward
the Abell 1314 area
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See also:
J/MNRAS/246/169 : 14P and 15P sources
J/A+A/241/551 : 18P and 19P sources
J/A+AS/115/345 : 32P and 33P sources
J/MNRAS/274/324 : 51P, 52P, 53P and 54P sources
J/MNRAS/301/203 : 67P, 68P, 69P and 70P sources
Table 1: Instrumental parameters at 408 MHz and 1420 MHz
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wavelength 73.5cm 21.1cm
Obs. Period Dec.'85-June'86 Dec.'85-June'86
Observing time 35 half-days 35 half-days
Field center, RA(1950) 11h 31m 30.0s 11h 31s 30.0s
Field center, Dec(1950) +49d 20' 00" +49d 20' 00"
Single dish HPBW 318' 103'
Synthesised HPBW, RAxDec 3.5' x 4.6' 1.0' x 1.3'
r.m.s. noise 10.0 mJy/beam area 0.86 mJy/beam area
Survey detection cutoff 7 r.m.s. 5 r.m.s.
Survey radial extent 223' 64'
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Byte-by-byte Description of file: table2 table3
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Bytes Format Units Label Explanations
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1- 6 A6 --- Source Source name
8- 9 I2 h RAh Right ascension (1950)
11- 12 I2 min RAm Right ascension (1950)
14- 17 F4.1 s RAs Right ascension (1950)
20- 22 F3.1 s e_RAs Standard deviation of right ascension
27 A1 --- DE- Declination sign
28- 29 I2 deg DEd Declination (1950)
31- 32 I2 arcmin DEm Declination (1950)
34- 35 I2 arcsec DEs Declination (1950)
38- 39 I2 arcsec e_DEs Standard deviation of declination
42- 45 I4 mJy Flux Flux density
47- 49 I3 mJy e_Flux Standard deviation of flux density
53- 61 A9 --- OtherName Other name (1)
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Note (1): In the 610 MHz survey of A1314 by Wilson and Vallee (1982, their
table 3)
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Byte-by-byte Description of file: table4
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Bytes Format Units Label Explanations
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1- 6 A6 --- Source Source name
11- 13 F3.1 arcmin MajAxis Major axis
22- 24 F3.1 arcmin MinAxis Minor axis
36- 38 I3 deg PA Position angle of the major axis
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Byte-by-byte Description of file: table5
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Bytes Format Units Label Explanations
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1- 5 A5 --- Source1 Source name at 1420 MHz
7- 8 I2 h RAh Right ascension (1950)
11- 12 I2 min RAm Right ascension (1950)
15- 18 F4.1 s RAs Right ascension (1950)
22- 23 I2 deg DEd Declination (1950)
26- 27 I2 arcmin DEm Declination (1950)
30- 31 I2 arcsec DEs Declination (1950)
34- 36 I3 mJy Flux1 Flux density at 21 cm (1420MHz)
42- 44 I3 mJy Flux2 Flux density at 74 cm (408MHz)
50- 53 F4.2 --- SpIndex Spectral index
56- 61 A6 --- Source2 Source name at 408 MHz
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Byte-by-byte Description of file: table6
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Bytes Format Units Label Explanations
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1- 5 F5.3 Jy LS Lower limit to the flux range
7 A1 --- n_LS [-] Separation label
9- 13 F5.3 Jy US Upper limit to the flux range
16- 17 I2 --- N(408) ? Number of sources observed at
Penticton in each flux range at 408 MHz
20- 26 E7.1 ct/sr/Jy dN/dS(408) ? Source counts at 408 MHz
31- 32 I2 --- N(610) ? Number of sources observed at
Penticton in each flux range at 610 MHz
35- 41 E7.1 ct/sr/Jy dN/dS(610) ? Source counts at 610 MHz
45- 46 I2 --- N(1420) ? Number of sources observed at
Penticton in each flux range at 1420 MHz
50- 56 E7.1 ct/sr/Jy dN/dS(1420) ? Source counts at 1420 MHz
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References:
Wilson A.S., Vallee J.P. 1982, Astron. Astrophys. Suppl. Ser. 47, 601
Historical Notes:
#A007 in H. Andernach's list
completed at CDS
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(End) James Marcout, Simona Mei [CDS] 11-Aug-1995