J/ApJS/80/137 Southern Extragalactic Radio Sources (Jones+, 1992)
The structure of southern extragalactic radio sources.
Jones P.A., McAdam W.B.
<Astrophys. J. Suppl. Ser. 80, 137 (1992)>
=1992ApJS...80..137J 1992ApJS...80..137J
ADC_Keywords: Radio sources ; Galaxies, radio ; Surveys
Keywords: galaxies: distances and redshifts - galaxies: photometry -
radio continuum: galaxies - surveys - techniques: interferometric
Description:
This catalog contains a list of 384 extragalactic radio sources south
of declination -30° which have been imaged with the Molonglo
Observatory Synthesis Telescope (MOST) at 843 MHz with a HPBW of 44" x
44" cosec(dec). The sample includes those sources noted in the
Molonglo Reference Catalog (MRC) (Cat.VIII/16) as extended (larger
than 1'), as well as those noted as multiple (within 8' of another
ssource and possibly related). The sample is representative of the
strong extended extragalactic radio sources of the southern sky, but
is not statistically complete. Positions, flux densities, and sizes
are given for all sources, and those sources which have been confirmed
as extended MRC sources are flagged. In addition, optical positions,
magnitudes, redshifts, and identifications are given for 201 of the
sources. These data were originally published in two tables which have
been merged in this version.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
southext.dat 95 384 Structure of Southern Extended Extragalactic
Radio Sources
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Byte-by-byte Description of file: southext.dat
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Bytes Format Units Label Explanations
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1 A1 --- Cflag [ C] Confirmation Flag for MRC Extended Source
Sample (1)
3- 11 A9 --- Name Name of source, followed by source flags (2)
12 A1 --- f_Name [ c*Nn] Source flag (2)
13- 20 F8.3 Jy S843 Integrated flux density at 843 MHz, in Jy (3)
22- 23 I2 h RAh Right Ascension (B1950) (hour) (4)
24- 25 I2 min RAm Right Ascension (B1950) (min)
26- 29 F4.1 s RAs Right Ascension (B1950) (sec)
30 A1 --- DE- Declination sign (B1950) (4)
31- 32 I2 deg DEd Declination (B1950) (deg)
33- 34 I2 arcmin DEm Declination (B1950) (arcmin)
35- 36 I2 arcsec DEs Declination (B1950) (arcsec)
39 A1 --- f_Size [ dslem<] Size flag for the source (5)
41- 45 F5.1 arcmin Size ? Angular size of the source (5)
47- 49 I3 deg PA ? Position angle of source (5)
52 A1 --- nearflg [ *] '*' if nearby source and flux is combined (6)
55 A1 --- newflg [ n] 'n' if optical info is new identification (7)
57- 58 I2 h RAoh ? Right Ascension (B1950) (hour) (8)
59- 60 I2 min RAom ? Right Ascension (B1950) (min)
61- 65 F5.2 s RAos ? Right Ascension (B1950) (sec)
66 A1 --- DEo- ? Declination sign (B1950) (8)
67- 68 I2 deg DEod ? Declination (B1950) (deg)
69- 70 I2 arcmin DEom ? Declination (B1950) (arcmin)
71- 74 F4.1 arcsec DEos ? Declination (B1950) (arcsec)
78- 81 F4.1 mag Bmag ? Magnitude of source (9)
83- 84 A2 --- ID Optical identification of source (10)
86- 91 F6.4 --- z ? Redshift of source (11)
93 A1 --- f_z [ n] 'n' if redshift is new (11)
95 A1 --- mult_flg [ *] '*' if position of another companion is
listed below (12)
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Note (1): This column is marked with a 'C' if the source is a member of the
Confirmed MRC Extended Sample. Sources in this study were
selected from the MRC if they were extended, slightly extended,
complex, or multiple sources. Those sources which have angular
size larger than 0.5' and flux density greater than 0.4 Jy at 843
MHz are considered confirmed as extended radio sources. The
confirmed sample is not complete to the limits of these criteria,
however, because the flagging procedures in the MRC (Large et al.
1981MNRAS.194..693L 1981MNRAS.194..693L) were conservative.
Note (2): This column gives the name of the source, comprised of the hours
and minutes of right ascension, the sign of the declination, the
degrees, to the nearest tenth of a degree. In addition, a capital
letter is appended to the name to distinguish components. The
following source flags may also be appended to the source name:
* Single source which has multiple listings in the MRC.
c Two or three sources that are combined in one MRC listing.
N Nearby source, listed in MRC but not flagged.
n Nearby source, not listed in MRC.
Note (3): This column gives the integrated flux density of the source at
843 MHz, in Jy. The integrated flux densities have an rms
uncertainty of ± 9%, of which 6% arises from the calibration of
the observations and 7% from the integration. The results were
checked against previously published data, and systematic errors
were estimated to be less than 5% in flux density (including
uncertainty in the absolute flux density scale).
Note (4): These columns give the B1950 right ascension and declination of
the centroid position. These positions have an accuracy of 1.6"
in right ascension and 2.2" cosec(dec) in declination.
Note (5): These columns give the size flag, angular size (in arcmin) and
position angle (in degrees) of the source. The angular size is to
be understood according to the size flag as follows:
d Separation of peaks in a double source.
e Largest separation of peaks in a complex source.
l Largest size of low-brightness emission in a complex sources.
m Deconvolved extent along axis of source.
s Largest separation of centroids of nearby sources. In this
case, the size is the distance between components which may be
matched by examination of the source names.
The position angle (north through east) of the peak separation or
deconvolved major axis is given except for a few curved sources
where the quoted position angle refers to the axis of the central
region.
Note (6): This column is flagged with an asterisk ('*') if there is a
nearby source to which the angular size refers. In these cases,
the size was often listed for multiple components in the
published version, grouped together with brackets. Pairs of
sources were also sometimes given angular sizes for both the
separation of centroids and the separation of peaks in a double.
Components may be matched by examination of the source names.
Note (7): This column is flagged with an 'n' if the optical identification
is new in this survey.
Note (8): These columns give the B1950 optical right ascension and
declination of the source. Film copies of the UK Schmidt IIIaJ
survey were searched for optical identifications. Optical
positions were measured with a two-coordinate measuring machine,
using nearby reference stars from the SAO and Cape star catalogs
(Hunstead 1971MNRAS.152..277H 1971MNRAS.152..277H). The plate parameters were
determined by a least-squares six-parameter fit to the reference
stars to give optical positions with an estimated accuracy of
0.5" in each coordinate.
Note (9): The mag column gives the magnitude (bJ) of the possible optical
identifications, estimated to the nearest 0.5 magnitude by
comparison of Polaroid enlargements of the Schmidt prints with
reference images of galaxies and stars of known magnitude. The
reference galaxies were from the lists of Carter
(1980MNRAS.190..307C 1980MNRAS.190..307C) and Dickens, Currie, and Lucey
(1986MNRAS.220..679D 1986MNRAS.220..679D), while the stars were from Hawkins (1979,
1981MNRAS.194.1013H 1981MNRAS.194.1013H). The reference magnitudes were corrected to
the survey color using the equation bJ = B - 0.23(B - V)
(Shanks et al., 1984MNRAS.206..767S 1984MNRAS.206..767S). For unresolved radio
sources, the search radius for galaxies and stellar objects was
5.6", which is approximately twice the combined radio and optical
position errors.
Note (10): Optical identifications are given in the 'ID' column. Galaxies were
accepted as identifications of the extended radio sources if the
projected optical-radio centroid offsets were less than 50 kpc.
The distance was estimated by assuming an absolute magnitude M of
-21.0 and making corrections to the apparent magnitude for
absorption and redshift. If more than one galaxy satisfied the 50
kpc criterion, the brightest galaxy was chosen. A few
identifications were accepted for sources having offsets greater
than 50 kpc when there was other evidence supporting the
identification (for example, a radio core coincident with the
optical object). The following symbols are used:
st Stellar image, probably a QSO
Q Confirmed QSO
BL Confirmed BL Lac object.
db Double galaxy (see mult_flg below)
Note (11): The redshift is given in the z column. Fourteen new redshifts
were measured using the Anglo-Australian Telescope. These
redshifts are flagged with an 'n' in the f_z column. All known
redshifts are listed, for completeness. Redshifts have been
obtained from the literature, largely from the compilations of
Veron-Cetty and Veron (1983A&AS...53..219V 1983A&AS...53..219V) and Palumbo,
Tanzella-Nitti, and Vettolani (1983). The original references are
quoted except for three objects with many redshift measurements
where the weighted average from Palumbo et al. (1983) was used.
** The redshifts have not been corrected for Galactic rotation.
Note (12): This column is flagged with an asterisk '*' if the optical
identification is a double galaxy and both positions were listed
in the published paper. The following second components were
given in the published paper:
0618-371 06 18 17.87 -37 10 18.7
0651-603 06 51 16.09 -60 18 28.9
1302-325 13 02 13.07 -32 33 13.4
2130-538 21 30 49.18 -53 51 33.6
2243-529 22 43 13.16 -52 59 17.0
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References:
Hawkins, M.R.S. 1979, M.N.R.A.S., 188, 691.
Palumbo, G.G.C., Tanzella-Nitti, G., and Vettolani, G. 1983, Catalogue of
Radial Velocities of Galaxies (New York: Gordon and Breach).
Cat. VII/99
History:
"The catalogue was originally archived as A041 by H. Andernach
() and the ADS documentation prepared in
collaboration with Carolyn Stern Grant ()."
(End) Patricio Ortiz [CDS] 06-Apr-1999