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 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:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 65 26 Log of the K-band imaging observations for our
74-MHz USS sample
table2.dat 91 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 80 119 Individual notes
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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.
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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
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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
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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- 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
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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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)
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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
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Byte-by-byte Description of file: notes.dat
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Bytes Format Units Label Explanations
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1- 12 A12 --- Name Source name
14- 89 A76 --- Note Text of the note
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 19-May-2005