J/MNRAS/347/837 Radio and K-band obs. of Ultra-Steep sources (De Breuck+, 2004)
A search for distant radio galaxies from SUMSS and NVSS -
I. Sample definition, radio and K-band imaging.
De Breuck C., Hunstead R.W., Sadler E.M., Rocca-Volmerange B., Klamer I.
<Mon. Not. R. Astron. Soc., 347, 837-853 (2004)>
=2004MNRAS.347..837D 2004MNRAS.347..837D
ADC_Keywords: Radio sources ; Radio continuum ; Photometry, infrared ;
Active gal. nuclei ; Redshifts
Keywords: Surveys ; Galaxies: active ; Radio continuum: galaxies;
Radio continuum: general
Description:
A sample of 76 ultra-steep spectrum (USS) radio sources is defined
from the 843-MHz Sydney University Molonglo Sky Survey (SUMSS) and
1.4-GHz NRAO VLA Sky Survey (NVSS) radio surveys with spectral index
α←1.3 and S(1.4GHz)>15mJy; 71 of these sources without bright
optical or near-infrared counterparts at 1.385GHz were observed with
the Australia Telescope Compact Array (ATCA), providing 5arcsec
resolution images and subarcsec positional accuracy. To identify their
host galaxies, near-infrared K-band images were obtained with IRIS2 at
the AAT and SofI at the NTT; 92% of the USS sources could be
identified down to K∼20.5.
142 FITS files containing the radio maps and the K-band images are
included in the fits subdirectory.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 160 76 The SUMSS-NVSS ultra-steep spectrum (USS) sources
table2.dat 36 76 Integration times of radio and near-IR observations
notes.txt 74 285 Notes on individual sources
fits/* . 142 Radio maps and K images of 71 USS sources
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See also:
VIII/65 : 1.4GHz NRAO VLA Sky Survey (NVSS) (Condon+ 1998)
VIII/70 : Sydney University Molonglo Sky Survey (SUMSS) (Mauch+ 2003)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 4 A4 --- --- [NVSS]
6- 19 A14 --- NVSS Name of the source (from J2000 position)
21- 24 I4 mJy S843 Integrated 843MHz flux density
26- 28 I3 mJy e_S843 Error in 843MHz flux density
30- 35 F6.1 mJy S1400 Integrated 1400MHz flux density
37- 40 F4.1 mJy e_S1400 Error in 1400 MHz flux density
42- 46 F5.2 --- Sp+Index Spectral index 843-1400MHz
48- 51 F4.2 --- e_Sp+Index Error in spectral index 843-1400MHz
53 A1 --- l_LAS [<] Limit flag on LAS
54- 57 F4.1 arcsec LAS ? Radio largest angular size from ATCA maps.
59- 61 I3 deg PA ? Radio position angle North through East
63- 67 A5 --- Tel Telescope used for K-band image (1)
70- 74 F5.2 mag K(2) ? K magnitude in 2" diameter aperture
76- 79 F4.2 mag e_K(2) ? Error in K(2) magnitude
81 A1 --- l_K(4) [<>] Limit flag on K(4) magnitude
82- 86 F5.2 mag K(4) ? K magnitude in 4" diameter aperture
88- 91 F4.2 mag e_K(4) ? Error in K(4) magnitude
93 A1 --- l_K(8) [<>] Limit flag on K(8) magnitude
94- 98 F5.2 mag K(8) ? K magnitude in 8" diameter aperture
100-103 F4.2 mag e_K(8) ? Error in K(8) magnitude
105-106 I2 h RAh Radio Right ascension (J2000.0)
108-109 I2 min RAm Radio Right ascension (J2000.0)
111-115 F5.2 s RAs Radio Right ascension (J2000.0)
117 A1 --- DE- Radio Declination sign
118-119 I2 deg DEd Radio Declination (J2000.0)
121-122 I2 arcmin DEm Radio Declination (J2000.0)
124-127 F4.1 arcsec DEs Radio Declination (J2000.0)
129 A1 --- rPos [NA] Position origin code (2)
131-132 I2 h RAKh ? K-band Right ascension (J2000.0)
134-135 I2 min RAKm ? K-band Right ascension (J2000.0)
137-141 F5.2 s RAKs ? K-band Right ascension (J2000.0)
143 A1 --- DEK- ? K-band Declination sign
144-145 I2 deg DEKd ? K-band Declination (J2000.0)
147-148 I2 arcmin DEKm ? K-band Declination (J2000.0)
150-153 F4.1 arcsec DEKs ? K-band Declination (J2000.0)
155-160 F6.4 --- z ? 2dF spectroscopic redshift
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Note (1): The following abbreviations are used:
2MASS: Two Micron All Sky Survey
AAT: Anglo Australian Telescope
NTT: New Technology Telescope
Note (2): The following abbreviations are used:
N: NVSS (Cat. VIII/65) survey
A: ATCA observations
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 4 A4 --- --- [NVSS]
6- 19 A14 --- NVSS Name of the source (from J2000 position)
21- 24 I4 s ATCA ? Integration time of ATCA (radio) observation (1)
27- 30 I4 s AAT ? Integration time of AAT (K-band) observation (2)
33- 36 I4 s NTT ? Integration time of NTT (K-band) observation (2)
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Note (1):
The corresponding radio map is named from the NVSS source name,
followed by "r.fits", e.g. NVSSJ002001-333408r.fits
Note (2):
The corresponding K-band image is named from the NVSS source name,
followed by "K.fits", e.g. NVSSJ002001-333408K.fits
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Acknowledgements:
It is a pleasure to thank Carlos de Breuck (ESO), who supplied the
copy of the FITS files as well as an ascii version of table1.
(End) James Marcout, Patricia Bauer, Francois Ochsenbein [CDS] 19-May-2004