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J/AJ/123/637        Ultra-steep-spectrum radio sources       (De Breuck +, 2002)

Optical and near-infrared imaging of ultra-steep-spectrum radio sources: the K-z diagram of radio-selected and optically selected galaxies. De Breuck C., van Breugel W., Stanford S.A., Rottgering H., Miley G., Stern D. <Astron. J. 123, 637 (2002)> =2002AJ....123..637D
ADC_Keywords: Radio sources ; Redshifts ; Galaxies, photometry Keywords: galaxies: active - galaxies: formation - galaxies: photometry - galaxies: structure - pulsars: general - radio continuum - surveys Abstract: We present optical and/or near-IR images of 128 ultra-steep-spectrum radio sources. Roughly half of the objects are identified in the optical images (R≲24), while in the near-IR images, more than 94% are detected at K≲22. The mean K magnitude is 19.26 within a 2" diameter aperture. The distribution of R-K colors indicates that at least one-third of the objects observed have very red colors (R-K>5). The major axes of the identifications in the K band are preferentially oriented along the radio axes, with half of them having compact morphologies. The 22 sources with spectroscopic redshifts and K-band magnitudes follow the K-z relation found from previous radio samples, but with a larger scatter. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table5.dat 44 83 Optical Photometry of USS Sources table6.dat 47 365 Astrometric Data table7.dat 109 87 K-band Photometry and Morphology
See also: J/A+AS/93/399 : Optical id. of steep spectrum radio sources (Wieringa+ 1992) J/A+AS/108/79 : Ultra-steep spectrum radiosources (Roettgering+, 1994) J/A+AS/143/303 : Ultra steep spectrum radio sources catalog (De Breuck+ 2000) Byte-by-byte Description of file: table5.dat
Bytes Format Units Label Explanations
1- 13 A13 --- [DVR2000] Source name 15- 19 F5.3 --- z ? Redshift 21- 23 A3 --- Run Observation run number 25- 28 A4 --- Filt [I R rS] Filter (1) 30 A1 --- l_Mag Limit flag on Mag 31- 34 F4.1 mag Mag ? Magnitude within 4'' diameter aperture 35 A1 --- u_Mag [:] Uncertainty flag in Mag 37 A1 --- f_Mag [ad] Flag on Mag (2)
Note (1): Filters: rS: "Spinrad night-sky" filter, λeff=6890Å, EW=1370Å Transformation from Spinrad night-sky rS into Johnson VR: (rS - R) = -0.004 - 0.072(V-R) + 0.073(V-R)2 Note (2): Flag on Mag: d = Estimated from non-photometric conditions a = Nearby bright star prohibits measurement
Byte-by-byte Description of file: table6.dat
Bytes Format Units Label Explanations
1- 13 A13 --- [DVR2000] Source name (1) 15- 22 A8 --- Pos Source position (2) 24- 25 I2 h RAh Hour of Right Ascension (J2000) 27- 28 I2 min RAm Minute of Right Ascension (J2000) 30- 34 F5.2 s RAs Second of Right Ascension (J2000) 36 A1 --- DE- Sign of the Declination (J2000) 37- 38 I2 deg DEd Degree of Declination (J2000) 40- 41 I2 arcmin DEm Arcminute of Declination (J2000) 43- 46 F4.1 arcsec DEs Arcsecond of Declination (J2000)
Note (1): Simbad designation: The name is [DVR2000] AA JHHMM+DDMM for the source position (i.e. Pos = Radio, IR or Opt) The name is [DVS2002] AA JHHMM+DDMM AAAAA for the offset stars where AAAAA = A(opt), A(IR) or B(IR) (i.e. Pos = A(opt), A(IR) or B(IR)) Note (2): Source position: Radio = radio source position Opt = optical identification IR = near-IR identification A(opt) = offset star within optical image A(IR) = offset star within near-IR image B(IR) = second offset star within near-IR image
Byte-by-byte Description of file: table7.dat
Bytes Format Units Label Explanations
1- 13 A13 --- [DVR2000] Source name 15- 19 F5.3 --- z ? Redshift 20 A1 --- u_z [:] Uncertainty flag on z 22- 24 A3 --- Run Observation run number 26- 29 A4 --- Filt [K k' KS Ks] Filter (1) 31- 35 F5.3 mag K(A) K-band extinction from H I column density 37 A1 --- l_2mag Limit flag on 2mag 38- 42 F5.2 mag 2mag Magnitude within 2'' diameter aperture 44- 47 F4.2 mag e_2mag ? Error in 2mag (2) 49 A1 --- f_2mag [d] Flag on 2mag (3) 51- 55 F5.2 mag 4mag ? Magnitude within 4'' diameter aperture 57- 60 F4.2 mag e_4mag ? Error in 4mag (2) 62 A1 --- f_4mag [d] Flag on 4mag (3) 64- 68 F5.2 mag 8mag ? Magnitude within 8'' diameter aperture 70- 73 F4.2 mag e_8mag ? Error in 8mag (2) 75 A1 --- f_8mag [d] Flag on 8mag (3) 77 A1 --- l_HLRad Limit flag on Rad 78- 80 F3.1 arcsec HLRad ? The half-light radius 82- 85 F4.2 --- Ellipt ? Ellipticity 87- 89 I3 deg PA ? Position angle 91-108 A18 --- Morph Morphology information
Note (1): Keck and CTIO filter passbands: K: 2.000um-2.427um k': 1.955um-2.292um KS: 1.990um-2.320um Ks: 1.990um-2.300um Note (2): Includes both the zero-point uncertainty and the aperture centering and sky fitting uncertainties. Note (3): Flag on magnitudes: d: Estimated from non-photometric conditions.
History: From electronic version of the journal * 24-Apr-2003: Source named "WN J0837-1053" corrected into "TN J0837-1053" * 10-Jul-2003: Source named "TN J0859-1510" corrected into "TN J0856-1510"
(End) Greg Schwarz [AAS], Patricia Bauer [CDS] 25-Apr-2002
(End) Greg Schwarz [AAS], Patricia Bauer [CDS] 25-Apr-2002
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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