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J/MNRAS/355/20      K magnitudes of 74MHz radio sources      (Jarvis+, 2004)
Near-infrared K-band imaging of a sample of ultra-steep-spectrum radio sources
selected at 74 MHz.
    Jarvis M.J., Cruz M.J., Cohen A.S., Rottgering H.J.A., Kassim N.E.
   <Mon. Not. R. Astron. Soc., 355, 20-30 (2004)>
   =2004MNRAS.355...20J
ADC_Keywords: Radio sources ; Photometry, infrared

Keywords: galaxies: active - galaxies: evolution - galaxies: high-redshift -
          galaxies: nuclei - radio continuum: galaxies

Abstract:
    In this paper we present near-infrared K-band imaging of a sample of
    ultra-steep-spectrum (USS) radio sources selected at 74-MHz. The dual
    selection criteria of low frequency and USS mean that we should be
    sensitive to the highest-redshift (z>5) radio galaxies. We have
    obtained K-band magnitudes for all of the objects in our sample of
    26 and discuss the properties of each.

Description:
    The K-band (2.2µm) imaging of the 74-MHz ultra-steep-spectrum (USS)
    sample was made over several flexibly scheduled runs at the United
    Kingdom Infrared Telescope (UKIRT), beginning in 2003 December up to
    2004 March.

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table1.dat        65       26   Log of the K-band imaging observations for our
                              74-MHz USS sample
table2.dat       106       28  *The K-band magnitudes for the 74-MHz USS sample
                              in three different angular apertures
table3.dat        66       27   Summary of the key observational results for the
                              74-MHz USS sample
notes.dat         89      119   Individual notes

Note on table2.dat: 1229.9+3712 is not shown as it is now omitted from the
  sample because the 74-MHz emission is from the lobe of a larger source.


See also:
   J/A+A/435/863  : B3-VLA sample. IV: 74MHz flux densities (Mack+, 2005)
   J/ApJS/150/417 : Deep, high-resolution survey at 74MHz (Cohen+, 2004)


Byte-by-byte Description of file: table1.dat

   Bytes Format Units      Label     Explanations

   1- 12  A12   ---        Name      Source name
  14- 23  A10 "YYYY-MM-DD" Date1     Observation date
      24  A1    ---        ---       [,]
  26- 35  A10 "YYYY-MM-DD" Date2     Observation date
      36  A1    ---        ---       [,]
  38- 47  A10 "YYYY-MM-DD" Date3     Observation date
      48  A1    ---        ---       [,]
  50- 59  A10 "YYYY-MM-DD" Date4     Observation date
  61- 64  I4    s          ExpTime   Total exposure time


Byte-by-byte Description of file: table2.dat

   Bytes Format Units   Label   Explanations

   1- 12  A12   ---     Name    Source name
      13  A1    ---     m_Name  Multiplicity index on Name
      15  A1    ---    l_Kmag3  Limit flag on Kmag3
  16- 21  F6.3  mag     Kmag3   ? K magnitude from 3-arcsec diameter
  23- 27  F5.3  mag    e_Kmag3  ? rms uncertainty on Kmag3
      29  A1    ---    l_Kmag5  Limit flag on Kmag5
  30- 35  F6.3  mag     Kmag5   ? K magnitude from 5-arcsec diameter
  37- 41  F5.3  mag    e_Kmag5  ? rms uncertainty on Kmag5
      42  A1    ---    n_Kmag5  [n] n: radio galaxy is too close to a nearby
                                        object to measure the magnitude reliably
      43  A1    ---    l_Kmag8  Limit flag on Kmag8
  44- 49  F6.3  mag     Kmag8   ? K magnitude from 8-arcsec diameter
  51- 55  F5.3  mag    e_Kmag8  ? rms uncertainty on Kmag8
      56  A1    ---    n_Kmag8  [n] n: radio galaxy is too close to a nearby
                                        object to measure the magnitude reliably
  57-106  A50   ---     Notes   Notes


Byte-by-byte Description of file: table3.dat

   Bytes Format Units   Label     Explanations

   1- 12  A12   ---     Name      Source name
      13  A1    ---     m_Name    Multiplicity index on Name
      14  A1    ---     f_Name    [abc] Individual note on Name (1)
  16- 17  I2    h       RAh       Right ascension (J2000.0)
  19- 20  I2    min     RAm       Right ascension (J2000.0)
  22- 26  F5.2  s       RAs       Right ascension (J2000.0)
      28  A1    ---     DE-       Declination sign (J2000.0)
  29- 30  I2    deg     DEd       Declination (J2000.0)
  32- 33  I2    arcmin  DEm       Declination (J2000.0)
  35- 38  F4.1  arcsec  DEs       Declination (J2000.0)
  40- 44  F5.3  Jy      S74MHz    74MHz flux density
      46  A1    ---   l_Sp+Index  Limit flag on Sp+Index
  47- 51  F5.2  ---     Sp+Index  Spectral index between 1400 and 74MHz
      53  A1    ---     l_Kmag8   Limit flag on Kmag8 (3σ limit)
  54- 59  F6.3  mag     Kmag8     ? K magnitude (in 8-arcsec aperture)
  61- 65  F5.3  mag     e_Kmag8   ? rms uncertainty on Kmag8
      66  A1    ---     n_Kmag8   [de] Note on Kmag8 (2)

Note (1): Note on Name as follows:
      a = The quoted magnitudes are for the bright galaxy to the
          north-east; the actual ID may not be visible in this image
          (see notes on this source)
      b = This is a large source where the 74-MHz ID is associated with an
          extended lobe (Fig. 2)
      c = The quoted magnitude relates to the K-band ID at J1230.6+3247A
Note (2): Note on Kmag as follows:
      d = The K-band magnitudes are measured using a 5-arcsec diameter
          aperture
      e = Measured in a 3-arcsec apertures, given due to the proximity of a
          K-band source to the ID


Byte-by-byte Description of file: notes.dat

   Bytes Format Units   Label     Explanations

   1- 12  A12   ---     Name      Source name
  14- 89  A76   ---     Note      Text of the note


History:
    From electronic version of the journal
(End)                                      Patricia Vannier [CDS]    19-May-2005