J/MNRAS/227/607 Optical identifications of Molonglo sources (White 1987)
Optical identifications of radio sources from the Molonglo deep surveys.
I. The declination -20 portion of the first deep survey.
White G.L.
<Mon. Not. R. Astron. Soc. 227, 607 (1987)>
=1987MNRAS.227..607W 1987MNRAS.227..607W
ADC_Keywords: Radio sources ; Photometry
Abstract:
Optical identifications have been sought for 304 radio sources from
the declination -20° region of the first Molonglo deep survey.
Optical objects have been measured using the Palomar sky survey to an
accuracy of 1 arcsec and magnitude estimates are to 0.4mag. Finding
charts are given for all fields with optical objects within
±2σ of the radio position. Sixteen QSOs have been confirmed
(details have been reported elsewhere) amongst the blue stellar-like
objects and spectroscopy is complete to mo=19.5. The mean magnitude
of the QSOs is 19.2 and the mean redshift is 1.34. A study of the
background densities of objects indicates that about half of the
remaining blue stellar-like objects are QSOs and about 80 per cent of
the galaxies are associated with the radio emission. The QSOs are
amongst the fainter and the bluer of the blue stellar-like objects.
There is no evidence for any average offset between the radio and
optical positions.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 83 425 Objects in the optical search area
01:00 to 06:05 (RA) at Dec=-20°
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See also:
VIII/16 : Molonglo Reference Catalogue of Radio Sources (Large+ 1991)
J/ApJS/107/19 : MRC/1Jy Radio source survey. I. (McCarthy+ 1996)
VIII/45 : Southern flat-spectrum sources (White+ 1987-1991)
VIII/46 : Molonglo deep sky survey of radio sources (Robertson, 1977)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Source Molonglo source name (based on B1950 position)
11- 17 A7 --- Type Object type (1)
19- 22 A4 --- Color as "RED", "BLUE" or "NEUT" (neutral)
25 A1 --- l_Omag [>] Limit flag on Omag
26- 29 F4.1 mag Omag ? Blue magnitude
30 A1 --- n_Omag [N?] N: NV (for 'not visible')
31 A1 --- l_Emag [>] Limit flag on Emag
32- 35 F4.1 mag Emag ? Red magnitude
36 A1 --- n_Emag [N?] N: NV (for 'not visible')
37- 39 I3 arcsec dRA ? Relative position (radio-optical) in RA
41 A1 --- l_dRA [<] Limit flag on e_dRA
42- 44 F3.1 arcsec e_dRA ? Mean error on dRA
46- 48 I3 arcsec dDE ? Relative position (radio-optical) in Dec
50 A1 --- l_dDE [<] Limit flag on e_dDE
51- 53 F3.1 arcsec e_dDE ? Mean error on dDE
56- 83 A28 --- Notes Various notes, * = defined in the text (2)
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Note (1): Object types as follows:
QSO = Quasar, redshift given in column 10.
STAR = Star confirmed by spectroscopy.
ST = Stellar-like object.
ST? = Object most probably stellar.
GAL = Galaxy of unspecified nature.
GALAXY = Galaxy with redshift.
GAL? = Object most probably a galaxy.
BLANK = Blank optical field.
Note (2): Notes as follows:
z = Redshift of confirmed identification from White et al.
(1980MNRAS.193..329W 1980MNRAS.193..329W, 1980PASAu...4...88W 1980PASAu...4...88W) or
White (1984, PhD. thesis).
MC1 = This source is listed in the "Molonglo Radio Source Catalogue"
by Davies et al. (1973AuJPS..28....1D 1973AuJPS..28....1D)
PKS = This source is listed in the Parkes 2700MHz survey
(Bolton, Shimmins & Wall 1975AuJPS..34....1B 1975AuJPS..34....1B;
Wall, Wright & Bolton 1976AuJPA..39....1W 1976AuJPA..39....1W)
B1 = This source is listed in the Bologna B1 catalogue
(Braccesi et al. 1965, Nuovo Cimento (Ser. X), Part B, 40, 267).
RC,U,(13) = Details of the radio observations are given by a comment by
Robertson (1977AuJPA..30..209R 1977AuJPA..30..209R, 1977AuJPA..30..231R 1977AuJPA..30..231R).
BLANK FST = The suggested optical identifications of source 0210-204
are confirmed by an observation made with the Fleurs
Synthesis Telescope (White 1984, PhD. thesis).
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Table 2: Optical objects within the 2σ search area.
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Sources: 304
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BLANK: 158
QS0s: 16 BLUE 16
/ BLUE 14
STARS: 18 { NEUT 2
RED 2
/ BLUE 23
ST: 110 { NEUT 15
RED 72
/ BLUE 8
ST?: 21 { NEUT 1
RED 12
/ BLUE 1
GAL?: 29 { NEUT 4
RED 24
/ BLUE 1
GAL 71 { NEUT 2
RED 67
/ BLUE 1
GALAXY: 2 { NEUT 0
RED 1
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Nomenclature Notes: All sources should be named MDS1 HHMM-DDD, as listed in
1977AuJPh..30..209R 1977AuJPh..30..209R, Robertson: MDS1 Molonglo deep radio survey I.
1977AuJPh..30..231R 1977AuJPh..30..231R, Robertson: MDS1 Molonglo deep radio survey II.
History:
This version, prepared via OCR at CDS in 1997, is a merge of two tables:
Table 1: Objects in the optical search area 01h00h to 06h05m at Dec=-20deg
Table 2: Objects in the optical search area 13h45h to 16h20m at Dec=-20deg
The RA-sorting was corrected for two paragraphs in the original paper
(five sources starting with 0506-199 and 1450-200).
1. 1449-197 corrected into 1459-197: all sources except that one are
contained in MDS1 (1977AuJPh..30..209R 1977AuJPh..30..209R, 1977AuJPh..30..231R 1977AuJPh..30..231R).
According to its position in the table it was assumed for the
present electronic version that it is MDS1 1459-197.
2. 0503-200: for this source, classified as 'BLUE', the Emag is most
probably actually the Omag, since it is noted as 'not visible' on
the E print and clearly visible on the O print published in the paper.
Acknowledgements: We thank H. Andernach () for his
proof-reading and checking, which lead to the notes mentioned under
the "History" section.
(End) Francois Ochsenbein [CDS], Heinz Andernach 09-Apr-1997