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J/ApJS/82/1 Optical Identification of Texas Survey Radio Sources (Bozyan 1992)
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Optical identification, radio galaxy environment, and statistical properties
for a homogeneous sample of 3196 radio sources from the Texas Survey
Bozyan E.P.
<Astrophys. J. Suppl. Ser. 82, 1 (1992)>
=1992ApJS...82....1B
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ADC_Keywords: Radio sources; Galaxies, radio; QSOs; Clusters, galaxy; Surveys
Keywords: Galaxies: clustering; Quasars: general; Radio continuum: galaxies
Description:
National Geographic Society Palomar Sky Survey E and O glass copy plates
were searched for optical counterparts to a homogeneous sample of 3196
sources from the 365 MHz Texas Survey in the region +31 < Dec. < +41 degrees,
|b| > 20 degrees. The search resulted in 860 optical identifications
coincident with the radio centroid within the 4 arcsecond search radius.
There were also 728 possible identifications at the plate limit and 1608
empty fields with no optical counterpart to the plate limit. Radio source
data and optical identification data are tabulated for the entire sample.
For the positive identifications, the optical data includes magnitudes
estimated from the plates to 0.5 mag and classifications of the appearance
as stellar or diffuse.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table456.dat 193 3196 Optical identifications
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See also:
VII/54 : Extragalactic Radio Source Identifications (Veron-Cetty+ 1983)
VIII/42 : Texas Survey of Radio Sources at 365 MHz (Douglas+ 1996)
Byte-by-byte Description of file: table456.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Name Texas Survey radio source name in IAU format
11 A1 --- Mflg Goodness of structure model fit (1)
12 A1 --- Eflg Influence of environment on fit (1)
13 A1 --- Lflg Probability the position is lobe-shifted (1)
15- 16 I2 h RAh Right Ascension (1950)
17- 18 I2 min RAm Right Ascension (1950)
19- 24 F6.3 s RAs Right Ascension (1950)
26- 30 F5.3 s e_RAs Right Ascension error
32 A1 --- DE- Declination sign
33- 34 I2 deg DEd Declination (1950)
35- 36 I2 arcmin DEm Declination (1950)
37- 41 F5.2 arcsec DEs Declination (1950)
42- 46 F5.2 arcsec e_DEs Declination error
48- 52 I5 mJy S365 365 MHz flux density
54- 56 I3 mJy e_S365 Flux density error
58- 61 F4.1 --- Spec ? 335-385 MHz spectral index, S~nu**(-Spec)
62- 64 F3.1 --- e_Spec ? Error in spectral index
66- 69 F4.1 --- Chi2 ? Chi-squared per dof flux residual over
4 observing cycles
70 A1 --- Vflg ? * means source may be variable
72- 74 I3 arcsec Sep ? Component separation in double model
76- 77 I2 arcsec e_Sep ? Error in component separation
79- 82 A4 --- Struct Structure model type, P: point source,
D: double, AD: asymmetric double
84- 85 I2 --- q ? Flux asymmetry parameter for AD model (2)
87- 90 I4 deg Xi [-180,180]? Position angle of double
92- 93 I2 deg e_Xi ? Error in position angle
95- 96 I2 --- KA2 ? Second most likely RA lobe
97- 98 I2 --- KD2 ? Second most likely Dec lobe
100-103 A4 --- ID_E Identification on E plate (3)
104 A1 --- App_E ? Appearance on E plate, S: stellar,
D: diffuse
106-109 A4 --- ID_O Identification on O plate (3)
110 A1 --- App_O ? Appearance on O plate, S: stellar,
D: diffuse
112 A1 --- Color ? B: blue, R: red, N: neutral
114-120 A7 --- Qual_E ? Qualifications for E identification (4)
122-124 A3 --- Qual_O ? Qualifications for O identification (4)
126-172 A47 --- Comment ? Additional identifications, close optical
companions, or other comments
174-193 A20 --- Known ? Previous ID, or ID within 2 arcmin of center
of Abell or Zwicky cluster (5)
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Note (1): +: Acceptable,
C: Caution,
W: Warning,
N: No model,
X: Source may be sidelobe response to nearby source(s).
Note (2): q=100*(S1-S2)/(S1+S2), where S1 and S2 are the fluxes of the
two components.
Note (3): Magnitude of object nearest the radio source within search area,
or PL for plate limit identification, or EF for empty field.
Note (4): Entries with 2 or 3 characters are qualifying remarks:
DP: dirty picture. Dust specks or dirt are evident on the
finding chart.
PD: plate defect. This can be on the PSS plate, the 35mm
negative or the finding chart print.
LP: light picture. The print of the finding chart is somewhat
overexposed but the grains of the PSS plate are visible.
VLP: very light picture. The print of the finding chart is very
overexposed. The grains of the PSS plate are barely visible.
CH: crosshairs. The finding chart has closed rather
than open crosshairs.
CF: crowded field.
OF: obscured field. The field within the 4.14" search radius is
partially obscured.
Entries with 4 characters separated by dashes describe membership
of the identification within a group or cluster of galaxies.
First character: B: Brightest member
M: member
Second character: C: Compact group. The galaxies are separated by
only a few galaxy diameters.
M: Medium compact group. The galaxies are
separated by about 5 to 10 galaxy diameters.
Third character: 1: one first ranked galaxy.
2: two approximately equal magnitude
first ranked galaxies.
3: three or more approximately equal magnitude
first ranked galaxies.
Fourth character: S: small group, 5 galaxies.
M: medium group, 5 to 10 galaxies.
L: large group, > 10 galaxies.
C: cluster, >> 10 galaxies.
Note (5): Identifications Within 2 Arcmin of Known Clusters of Galaxies.
The letter preceding the cluster catalog number:
A: Abell Cluster
Z: Zwicky Cluster
The notations following the catalog number:
CC: at cluster center
NC: not at cluster center
MC: near cluster center
NI: not identified with probable cluster member
C: cluster not obvious on finding chart
EF: identification is EF (empty field)
Previous Identifications:
V: Identification from Veron-Cetty and Veron (1983A&AS...53..219V)
W: Identification from Wills and Wills (unpublished)
Followed by one or more of the symbols listed below:
Q = Identification is probably a QSO or BL Lac Object
G = Identification is probably a galaxy
Z = Identification is confirmed by spectrum giving redshift
S = Identification is confirmed to be a star
E = Veron-Cetty & Veron list an empty field at the source position
X = For Veron-Cetty & Veron, I disagree with the identification
: = For Veron-Cetty & Veron, the agreement with the TS
identification is questionable
: = For Wills and Wills, the spectroscopic data suggests
but does not confirm the identification
Remarks:
1. Note from H. Andernach (Feb. 1994):
It was found that only the nominal UTRAO positions were checked for
optical counterparts, but not the alternate positions as indicated in the
lobeshift columns. Accidentally I found some candidates at these positions,
so it should be kept in mind that sources with lobeshift alternatives and
classified as 'empty field' might in fact have a counterpart at the shifted
position!
2. A blank entry for the position angle error for each of the sources
0142+359, 0902+384, and 1438+382 was changed to a value of 99. This is
consistent with the values for these sources in catalog 8042, Texas Survey
of Radio Sources at 365 MHz (Douglas+ 1996).
Acknowledgements:
An electronic version of the merged data table, prepared by E.P. Bozyan
(6/93), was provided to ADC by H. Andernach.
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(End) N. Odegard [SSDOO/ADC] 23-Sep-1999