J/ApJS/194/31 Morphology for groups in the FIRST database (Proctor, 2011)
Morphological annotations for groups in the FIRST database.
Proctor D.D.
<Astrophys. J. Suppl. Ser., 194, 31 (2011)>
=2011ApJS..194...31P 2011ApJS..194...31P
ADC_Keywords: Surveys ; Radio sources ; Morphology
Keywords: astronomical databases: miscellaneous - catalogs - galaxies: general -
methods: data analysis - methods: statistical -
techniques: image processing
Abstract:
The morphology of selected groups of sources in the Faint Images of
the Radio Sky at Twenty Centimeters (FIRST) survey and catalog is
examined. Sources in the FIRST catalog (2003 April release, 811117
entries) were sorted into singles, doubles, triples, and groups of
higher-count membership based on a proximity criteria. The 7106 groups
with four or more components were examined individually for bent types
including, but not limited to, wide-angle tail and narrow-angle tail
types. In the process of this examination, ring, double-double,
X-shaped, hybrid morphology, giant radio sources, and the herein
described W-shaped and tri-axial morphology systems were also
identified. For the convenience of the reader separate tables for
distinctive types were generated. A few curiosities were found. For
the 16950 three-component groups and 74788 two-component groups,
catalogs with probability estimates for bent classification, as
determined by pattern recognition techniques, are presented.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 172 412 WAT (wide-angle tail) and NAT (narrow-angle tail)
sources
table2.dat 163 147 W-shaped sources
table3.dat 181 45 TB-type sources (three-component bent)
table4.dat 138 33 B-type sources (two-component bent)
table5.dat 237 65 Ring-type sources
table6.dat 180 82 Ring-lobe type sources
table7.dat 226 28 HYMOR (hybrid morphology) candidates -
an incidental list
table8.dat 181 156 X-shaped sources
table9.dat 177 242 DD (Double-double) sources
table10.dat 151 103 Core-jet sources
table11.dat 170 400 S or Z-shaped sources
table12.dat 183 25 GRS (Giant radio sources) - an incidental list
table13.dat 161 48 Tri-axial type morphology sources
table14.dat 153 52 Quad-type morphology sources
table15.dat 211 119 Other interesting sources
table16.dat 204 91 Selected sources from three component group
training set
table17.dat 90 16950 Probability estimates for a three component group
being bent
table18.dat 169 80 Selected sources from two component groups
training set
table20.dat 61 74788 Probability estimates for a two component group
being bent
tablea2.dat 272 41108 Morphological annotations and components for groups
with four or more components
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See also:
VIII/71 : The FIRST Survey Catalog, Version 03Apr11 (Becker+ 2003)
http://sundog.stsci.edu/ : The VLA FIRST survey home project
Byte-by-byte Description of file: table[1-9].dat table1[0134568].dat
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Bytes Format Units Label Explanations
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1- 3 A3 --- --- [FCG]
5- 20 A16 --- FCG Source Designation (JHHHMMSS.s+DDMMSS)
24- 25 I2 h RAh System Hour of Right Ascension (J2000)
27- 28 I2 min RAm System Minute of Right Ascension (J2000)
30- 35 F6.3 s RAs System Second of Right Ascension (J2000)
38 A1 --- DE- Sign of the System Declination (J2000)
39- 40 I2 deg DEd System Degree of Declination (J2000)
42- 43 I2 arcmin DEm System Arcminute of Declination (J2000)
45- 49 F5.2 arcsec DEs System Arcsec of Declination (J2000)
52- 56 F5.2 arcmin Size System size
57 A1 --- u_Size Uncertainty flag on Size
61- 62 A2 --- Type [cv?* ] Core type (2)
64- 65 I2 h RAc.h ? Core Hour of Right Ascension (J2000)
67- 68 I2 min RAc.m ? Core Minute of Right Ascension (J2000)
70- 75 F6.3 s RAc.s ? Core Second of Right Ascension (J2000)
77 A1 --- DEc.- Sign of the Core Declination (J2000)
78- 79 I2 deg DEc.d ? Core Degree of Declination (J2000)
81- 82 I2 arcmin DEc.m ? Core Arcminute of Declination (J2000)
84- 88 F5.2 arcsec DEc.s ? Core Arcsec of Declination (J2000)
90- 95 I06 --- Group Group identification
97-102 I06 --- Group2 ? Second group identification
104-109 I06 --- Group3 ? Third group identification
111-116 I06 --- Group4 ? Fourth group identification
118-237 A120 --- Com Additional comment(s) (G1)
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Note (2): Flag as follows:
c = (presumed) core coordinate is FIRST catalog entry;
v = visual estimate from symmetry considerations.
* = unexplained flag
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Byte-by-byte Description of file: table17.dat table20.dat
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Bytes Format Units Label Explanations
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1- 4 F4.2 --- Vote Estimated probability of being bent radio galaxy
7- 8 I2 h RAc1h Core 1 Hour of Right Ascension (J2000)
10- 11 I2 min RAc1m Core 1 Minute of Right Ascension (J2000)
13- 18 F6.3 s RAc1s Core 1 Second of Right Ascension (J2000)
21 A1 --- DEc1- Sign of the Core 1 Declination (J2000)
22- 23 I2 deg DEc1d Core 1 Degree of Declination (J2000)
25- 26 I2 arcmin DEc1m Core 1 Arcminute of Declination (J2000)
28- 32 F5.2 arcsec DEc1s Core 1 Arcsec of Declination (J2000)
36- 37 I2 h RAc2h Core 2 Hour of Right Ascension (J2000)
39- 40 I2 min RAc2m Core 2 Minute of Right Ascension (J2000)
42- 47 F6.3 s RAc2s Core 2 Second of Right Ascension (J2000)
50 A1 --- DEc2- Sign of the Core 2 Declination (J2000)
51- 52 I2 deg DEc2d Core 2 Degree of Declination (J2000)
54- 55 I2 arcmin DEc2m Core 2 Arcminute of Declination (J2000)
57- 61 F5.2 arcsec DEc2s Core 2 Arcsec of Declination (J2000)
65- 66 I2 h RAc3h ? Core 3 Hour of Right Ascension (J2000)
68- 69 I2 min RAc3m ? Core 3 Minute of Right Ascension (J2000)
71- 76 F6.3 s RAc3s ? Core 3 Second of Right Ascension (J2000)
79 A1 --- DEc3- Sign of the Core 3 Declination (J2000)
80- 81 I2 deg DEc3d ? Core 3 Degree of Declination (J2000)
83- 84 I2 arcmin DEc3m ? Core 3 Arcminute of Declination (J2000)
86- 90 F5.2 arcsec DEc3s ? Core 3 Arcsec of Declination (J2000)
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Byte-by-byte Description of file: tablea2.dat
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Bytes Format Units Label Explanations
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1- 6 I06 --- Group Group identification number
8- 13 I06 --- Source ?=- Source identification number (1)
16- 17 I2 h RAh ? Hour of Right Ascension (J2000) (1)
19- 20 I2 min RAm ? Minute of Right Ascension (J2000) (1)
22- 27 F6.3 s RAs ? Second of Right Ascension (J2000) (1)
30 A1 --- DE- Sign of the Declination (J2000) (1)
31- 32 I2 deg DEd ? Degree of Declination (J2000) (1)
34- 35 I2 arcmin DEm ? Arcminute of Declination (J2000) (1)
37- 41 F5.2 arcsec DEs ? Arcsec of Declination (J2000) (1)
43-292 A250 --- Com Additional comments (G1)
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Note (1):
* coordinates are for the Group in the first line for each group
(Source = "------")
* subsequent lines give source positions.
otherwise the coordinates are for the source.
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Global Notes:
Note (G1): the additional comments use the abbreviations:
a = ambiguous
arc = arc or C, possible edge brightened lobe, bent jets, or ring fragment
asym = asymmetric
b = bent (B), little visual indication of core
bifurcation = a same side splitting of jet from apparent core
bs = bent slightly
butterfly = four lobe morphology
cat = catalog
cj = core-jet
CJC = Core-jet core component
CJJ = Core-jet jet component
CORE = Core component
cp = chance projection
d = double lobe radio galaxy - may include core-jet sources
dd = double double radio galaxy (DD)
diag = diagonal
distorted = smearing of prototypical morphologies with low level emission
dl = dogleg, generally an abrupt change in direction
fan = low level triangular shape lobe
hook = an apparent approximately 180 change in direction of jet
hymor = hybrid morphology - a few HYMOR candidates were specifically annotated
id = identification
int = interesting
irr = irregular, distorted (appear to be physically associated
but are not well described by another morphology class)
J = Jet
jet = jet or occasionally protrusion from lobe
lobe = lobe, resolved lobe
low level = extended low level flux, diffuse and/or filamentary
mg = multiple groupings possible
nat = narrow angle tail (NAT)
pinwheel = spiral type similar to optical star forming regions of
spiral galaxies
ppd = perpendicular
quad = group of four approximately point-like sources (QUAD)
quint = group of five approximately point-like sources (QUINT)
rc = resolved compact source, non-point-like
RING = Ring component
ring-lobe = edge brightened lobe or embedded ring
RJ = Resolved jet
RL = Component of resolved lobe
s = single source (often with sidelobes) or probable chance projection
of point-like source into group sidelobe
sl = sidelobe
ss = apparent single sided jet and/or lobe
sz = S-shaped or Z-shaped
SZC = Core component of S-shape or Z-shape
SZJ = Jet component of S-shape or Z-shape
t = triple, no bend, little extended structure
tb = bent triple (TB), little indication of extended structure
tbs = slightly bent triple
td = triple double
tri = 120 deg. rotational symmetry - may include chance projections
unu = unusual, uncommon - may be due to chance projection
w = W-shape, wiggles
wat = wide angle tail (WAT)
X = Transverse component of X group
x = X-shape
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 28-Jul-2011