J/AJ/131/114 The Molonglo Southern 4Jy sample. II (Burgess+, 2006)
The Molonglo Southern 4Jy sample (MS4).
II. ATCA imaging and optical identification.
Burgess A.M., Hunstead R.W.
<Astron. J., 131, 114-132 (2006)>
=2006AJ....131..114B 2006AJ....131..114B
ADC_Keywords: Active gal. nuclei ; Radio continuum ; Cross identifications
Keywords: galaxies: active - radio continuum: galaxies - surveys
Abstract:
Of the 228 sources in the Molonglo Southern 4Jy sample (MS4, Cat.
J/AJ/131/100), the 133 with angular sizes <35" have been imaged at
5GHz at 2"-4" resolution with the Australia Telescope Compact Array.
More than 90% of the sample has been reliably optically identified,
either on the plates of the UK Schmidt Southern Sky Survey or on
R-band CCD images made with the Anglo-Australian Telescope.
Description:
The Australia Telescope Compact Array (ATCA) is an east-west array
consisting of six 22m diameter paraboloidal antennas. We used an
observing frequency of 5GHz, with a bandwidth of 128MHz. The observing
was done in 12 different runs between 1990 and 1993, at an early stage
of ATCA operations. The first eight observing runs used five antennas
with a longest spacing of 3km, with nominal resolution
∼4"x4"cosec|δ|. The last five observing runs were made after the
6km antenna was commissioned, giving a resolution of
2"x2"cosec|δ|.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 203 13 Journal of ATCA observations
table2.dat 42 145 Summary of ATCA observing runs
table3.dat 82 149 Parameters measured from the ATCA images
table7.dat 92 229 Positions, magnitudes, and redshifts for the
optical counterparts
refs.dat 141 140 References
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See also:
J/AJ/131/100 : The Molonglo Southern 4Jy sample. I (Burgess+, 2006)
VIII/15 : Parkes Radio Sources Catalogue (PKSCAT90) (Wright+ 1990)
VIII/45 : Southern flat-spectrum sources (White+ 1987-1991)
J/ApJS/80/137 : Southern Extragalactic Radio Sources (Jones+, 1992)
J/ApJS/150/181 : Redshifts of 110 radio-loud AGNs (Eracleous+, 2004)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Run Observation run number
4- 13 A10 "YYYY/MM/DD" ObsDate Date of observation
15- 18 I4 MHz Freq [4740/4800] Observation frequency
20- 25 A6 --- Config Antenna configuration (1)
27- 39 A13 --- Calib Secondary calibrator name
40 A1 --- f_Calib [c] source used as calibrator (2)
42-203 A162 --- Others Other secondary calibrator(s)
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Note (1): "3km #2" = The full name is "3km minimum redundancy #2."
"3km #4" = The full name is "3km minimum redundancy #4."
Note (2): A "c" indicates the object was observed as a calibrator but not
subsequently used.
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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- 3 A3 --- --- [MRC]
5- 14 A10 --- MRC Source name
16- 17 I2 --- Run ? Run number (see Table 1)
19- 20 I2 --- Cuts Number of cuts
22- 23 I2 min Int Total integration time
25- 28 I4 --- S/N Final image dynamic range (7)
30- 38 A9 arcsec Beam FWHM of major and minor CLEAN beam axes
40- 42 I3 deg PA [-90/90] Major axis position angle of restoring
beam in degrees east of north (modulo 90)
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Note (7): Expressed as the ratio of the peak flux density to the RMS noise.
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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- 3 A3 --- --- [MRC]
5- 14 A10 --- MRC Source name
16- 19 A4 --- Class Fanaroff-Riley (1974MNRAS.167p..31F 1974MNRAS.167p..31F)/other
structural classification (1)
21- 22 I2 h RAh Hour of Right Ascension (J2000)
24- 25 I2 min RAm Minute of Right Ascension (J2000)
27- 31 F5.2 s RAs Second of Right Ascension (J2000)
33 A1 --- DE- Sign of the Declination (J2000)
34- 35 I2 deg DEd Degree of Declination (J2000)
37- 38 I2 arcmin DEm Arcminute of Declination (J2000)
40- 43 F4.1 arcsec DEs Arcsecond of Declination (J2000)
45- 47 A3 --- Pos Position measurement code (2)
49- 52 I4 mJy Sint Integrated flux density at 5GHz (3)
53 A1 --- u_Sint [:] Uncertainty flag on SInt
55 A1 --- l_Score Limit flag on SCore
56- 59 I4 mJy Score ? Core flux density at 5GHz (4)
60 A1 --- u_Score [:] Uncertainty flag on SCore
62 A1 --- l_Ratio Limit flag on Ratio
63- 69 F7.4 --- Ratio [0/16]? Core to extended flux density ratio
at 5GHz (5)
71 A1 --- f_Ratio [:c] uncertain (:) or compact-steep-spectrum (c)
73 A1 --- l_LAS Limit on LAS
74- 78 F5.1 arcsec LAS Largest angular extent
80- 82 I3 deg PAe [-90/90]? Position angle of extension in degrees
east of north (modulo 90°)
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Note (1): Structural classification, defined as follows:
1 = FR1 double;
2 = FR2 double;
1/2 = structure borderline between FR1 and FR2;
D2 = double with one component coincident with the optical counterpart
(McDonald & Miley 1971ApJ...164..237M 1971ApJ...164..237M);
T = core-dominated triple;
c = structure not resolved well enough to classify;
X = extended source which does not fall into any of the usual categories.
Note (2): Position measurement code, defined as follows:
p = peak;
ce = centroid;
co = core;
f = peak of a Gaussian fit to a compact source;
c = Position is from the MOST calibrator list. The source was a secondary
calibrator observed before a good ATCA position was available.
m = the midpoint of the two inner peaks of a tailed radio source;
^ = measured from an unpublished ATCA image (M. Wieringa, priv. comm.);
* = measured from an unpublished ATCA image obtained by the authors;
: = the position is suspect, usually because the source was observed in
Run 9: see Section 2.3.
Note (3): The integrated flux densities are uncertain and sometimes
underestimated, due to the limited uv coverage. They have been
measured mainly to provide an estimate of the fraction of emission
present in compact components.
Note (4): In the absence of spectral-index information, a compact component
is called the 'core' if it coincides with an optical counterpart.
However, for close doubles identified with galaxies, a component
coincident with the optical counterpart has not been classified as the
core, because D2 structures (MacDonald & Miley 1971ApJ...164..237M 1971ApJ...164..237M)
are rare in galaxies. For most sources the core flux density is an
upper limit. If extended emission lies near the core, the flux density
has been flagged with a colon. For doubles with widely separated
lobes, we adopted an upper limit of three times the r.m.s. noise in a
box of size 6x6pixels centred at the optical counterpart. For close
doubles we set an arbitrary upper limit of 1/3 of the integrated flux
density of the brighter lobe. For compact-steep-spectrum sources no
attempt was made to estimate the core flux density.
Note (5): The ratio was measured at the observed frequency, not in the
source's rest frame. These ratios are uncertain, because of the
uncertainty in the core flux densities. Calculated from SCore and the
Parkes single-dish flux density (see Table 5 of Paper I), which was
interpolated to the ATCA observing frequency using the radio spectrum.
In a few cases the ATCA core flux density was greater than the
single-dish total flux density, presumably because of variability. For
these sources the ATCA integrated flux density was used instead of the
Parkes value.
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Byte-by-byte Description of file: table7.dat
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Bytes Format Units Label Explanations
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1- 14 A14 --- Name Source name
16- 17 A2 --- ID Classification of the optical counterpart (1)
19 A1 --- f_ID [defi] Individual remarks (2)
21- 22 I2 h RAh ? Hour of Right Ascension (J2000) (3)
24- 25 I2 min RAm ? Minute of Right Ascension (J2000) (3)
27- 31 F5.2 s RAs ? Second of Right Ascension (J2000) (3)
33 A1 --- DE- Sign of the Declination (J2000) (3)
34- 35 I2 deg DEd ? Degree of Declination (J2000) (3)
37- 38 I2 arcmin DEm ? Arcminute of Declination (J2000) (3)
40- 43 F4.1 arcsec DEs ? Arcsecond of Declination (J2000) (3)
45 A1 --- l_bJmag Limit flag on bJmag
46- 49 F4.1 mag bJmag ? The bJ magnitude
50 A1 --- u_bJmag [:] Uncertainty flag on bJmag
51 A1 --- f_bJmag [bc] reason of absence of bJmag (4)
53 A1 --- l_Rmag Limit flag on Rmag
54- 57 F4.1 mag Rmag ? AAT CCD image R band magnitude
58 A1 --- u_Rmag [:] Uncertainty flag on Rmag
60- 62 F3.1 arcsec Seeing ? Seeing of the AAT CCD image
64 A1 --- l_z Limit flag on z
65- 71 F7.5 --- z ? Redshift
72 A1 --- f_z [:hg] uncertain or derived redshift (5)
74- 76 I3 --- r_ID ? ID reference
78- 80 I3 --- FC ? Finding chart reference
82- 84 I3 --- Opt ? Optical position reference
86- 88 I3 --- r_bJmag ? The bJ magnitude reference
90- 92 I3 --- r_z ? Redshift reference
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Note (1): Classification of the optical counterpart, defined as follows:
g = galaxy;
g? = possible galaxy;
l = BL Lac object;
Q = quasar;
Q? = quasar candidate,
BF = blank field;
O = field obscured by star;
R = unidentified relic radio source in cluster.
Note (2): Flag on ID, defined as follows:
d = Extended radio source with more than one candidate;
e = Compact radio source with large radio-optical offset;
f = Position quoted is that of the VLA core.
Note (3): Of the optical source.
Note (4): Flag on bmag, defined as follows:
b = Blank field on the Schmidt plates;
c = Crowded field not well analysed by COSMOS.
Note (5): Flag on z, defined as follows:
: = redshift estimated from Rmag or bmag, and therefore uncertain;
g = The redshift quoted is that of the galaxy NGC 5419;
h = The redshift quoted is that of the cluster Abell 3667.
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Byte-by-byte Description of file: refs.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Ref Reference number
5- 23 A19 --- Bibcode Bibcode
25- 50 A26 --- Aut Author's name
52-141 A90 --- Com Comment
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History:
From electronic version of the journal
References:
Burgess & Hunstead, Paper I 2006AJ....131..100B 2006AJ....131..100B, Cat. J/AJ/131/100
(End) Greg Schwarz [AAS], Marianne Brouty [CDS] 17-Aug-2006