J/MNRAS/373/1531 6C** sample of steep-spectrum radio sources (Cruz+, 2006)
The 6C** sample of steep-spectrum radio sources -
I. Radio data, near-infrared imaging and optical spectroscopy.
Cruz M.J., Jarvis M.J., Blundell K.M., Rawlings S., Croft S.,
Klockner H.-R., McLure R.J., Simpson C., Targett T.A., Willott C.J.
<Mon. Not. R. Astron. Soc., 373, 1531-1562 (2006)>
=2006MNRAS.373.1531C 2006MNRAS.373.1531C
ADC_Keywords: Radio sources
Keywords: galaxies: active - galaxies: evolution - galaxies: high-redshift -
radio continuum: galaxies
Abstract:
We present basic observational data on the 6C** sample. This is a new
sample of radio sources drawn from the 151-MHz 6C survey, which was
filtered with radio criteria chosen to optimize the chances of finding
radio galaxies at z>4. The filtering criteria are a steep-spectral
index and a small angular size. The final sample consists of 68
sources from a region of sky covering 0.421sr. We present Very Large
Array radio maps, and the results of K-band imaging and optical
spectroscopy.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 88 68 The survey flux densities of the 6C** sources
and the spectral indices derived from these
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See also:
VIII/18 : 6C Survey of radio sources - I. (Baldwin+ 1985)
VIII/21 : 6C Survey of radio sources - II. (Hales+ 1988)
VIII/22 : 6C Survey of Radio Sources - III. (Hales+ 1990)
VIII/23 : 6C Survey of radio sources - IV. (Hales+ 1991)
VIII/24 : 6C Survey of Radio Sources - V. (Hales+ 1993)
VIII/25 : 6C Survey of radio sources - VI. (Hales+ 1993)
Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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1- 11 A11 --- 6C 6C source name (6CHHMM+DDMM, B1950)
13- 14 I2 h RAh 6C right ascension (J2000)
16- 17 I2 min RAm 6C right ascension (J2000)
19- 22 F4.1 s RAs 6C right ascension (J2000)
24 A1 --- DE- 6C declination sign (J2000)
25- 26 I2 deg DEd 6C declination (J2000)
28- 29 I2 arcmin DEm 6C declination (J2000)
31- 32 I2 arcsec DEs 6C declination (J2000)
34- 35 I2 h RAN.h NVSS right ascension (J2000)
37- 38 I2 min RAN.m NVSS right ascension (J2000)
40- 43 F4.1 s RAN.s NVSS right ascension (J2000)
45 A1 --- DEN.- NVSS declination sign (J2000)
46- 47 I2 deg DEN.d NVSS declination (J2000)
49- 50 I2 arcmin DEN.m NVSS declination (J2000)
52- 53 I2 arcsec DEN.s NVSS declination (J2000)
55- 59 F5.2 Jy S151MHz 6C flux density at 151MHz
61- 64 F4.2 Jy e_S151MHz rms uncertainty on S151MHz
66- 71 F6.4 Jy S1.4GHz NVSS flux density at 1.4GHz
73- 78 F6.4 Jy e_S1.4GHz rms uncertainty on S1.4GHz
80- 83 F4.2 --- alpha Spectral index 1400MHz to 151MHz (1)
85- 88 F4.2 --- e_alpha rms uncertainty on alpha
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Note (1): Spectral indices are determined by:
alpha=-[log10(S1400)-log10(S151)]/[log10(1400)-log10(151)]
Error analysis on Parts II and III of the 6C catalogue shows that ∼60%
of the sources have flux densities within ±40mJy of their true value
(Hales et al. 1988, Cat. VIII/21, 1990, Cat. VIII/22), thus we
take 40mJy as the typical error for the 6C flux densities quoted here.
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 14-Aug-2007