J/AJ/98/419 Observed quantities from B3 sources (Vigotti+, 1989)
Structures, spectral indexes, and optical identifications of radio sources
selected from the B3 catalogue.
Vigotti M., Grueff G., Perley R., Clark B.G., Bridle A.H.
<Astron. J. 98, 419 (1989)>
=1989AJ.....98..419V 1989AJ.....98..419V
ADC_Keywords: Radio sources
Description:
This catalog contains results of a large program of optical
identifications of radio sources from the Third Bologna (B3) Catalog
(Ficarra et al., 1985A&AS...59..255F 1985A&AS...59..255F, Cat.VIII/37). A homogeneous
sample of 1103 radio sources, selected from the B3 catalog at 408 MHz
and covering a flux density range from 2.0 to 0.1 Jy, has been mapped
at 1465 MHz using the VLA at 15" resolution. Both positional and
structural information have been derived and are presented here.
Optical identifications have been attempted for all of the sources
within the range of right ascension studied, using the Palomar Sky
Survey prints, resulting in 354 proposed identifications. The RA range
was restricted to exclude sky areas at low galactic latitude, because
obscuration makes these unsuitable for optical identifications, and
confusion makes them unsuitable for VLA snapshot-mode observations.
Thus the samples were selected only from the RA intervals 23h-3h,
7h-15h. The number of rows of this table (1474) is larger than the
number of sources (1103) because each radio component of multiple
sources is listed as a separate line.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
b3id.dat 119 1474 Optical Identifications of 1103 B3 Radio Sources
(table2 of paper; 37°<δ<47°)
b3opt.dat 50 354 Summary of optical counterparts
notes.dat 274 257 Notes on the sources
refs.dat 216 53 References
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See also:
VIII/37 : The Third Bologna Survey (B3)
Byte-by-byte Description of file: b3id.dat
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Bytes Format Units Label Explanations
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1- 2 A2 --- --- [B3]
4- 12 A9 --- B3 Name of source (HHMM+DDdA from B1950 position) (1)
13 A1 --- n_B3 [*] Individual note (see "notes.dat")
15- 21 A7 --- Oname 3C or 4C name of source (2)
23 I1 --- Sam ? Number of B3 sample which contained source (3)
25- 26 I2 h RAh Radio Right Ascension (B1950) (hour) (4)
27- 28 I2 min RAm Radio Right Ascension (B1950) (min)
29- 32 F4.1 s RAs Radio Right Ascension (B1950) (sec)
33 A1 --- DE- Radio Declination sign (B1950) (4)
34- 35 I2 deg DEd Radio Declination (B1950) (deg)
36- 37 I2 arcmin DEm Radio Declination (B1950) (arcmin)
38- 39 I2 arcsec DEs Radio Declination (B1950) (arcsec)
41 A1 --- f_S1465 [- +] Flagged if flux is integrated or
upper limit (5)
42- 47 F6.1 mJy S1465 ? Flux density at 1465 MHz in mJy (5)
50 A1 --- M [URDT] Morphological classification of source (6)
51- 53 I3 arcsec LAS ? Largest angular size (6)
55- 59 F5.2 Jy S408 ? Flux density at 408MHz (7)
61- 65 F5.2 --- SI ? Spectral index between 1465 and 408 MHz (8)
67- 69 A3 --- ID [* BNG?] Proposed source identification (type) (9)
71 A1 --- f_z [*] '*' if redshift is from the literature (10)
73- 78 F6.4 --- z ? Estimated or measured redshift (10)
80- 83 F4.1 mag Rmag ? Red magnitude (11)
85- 86 I2 h RAo.h ? Optical Right Ascension (B1950)(hour)
87- 88 I2 min RAo.m ? Optical Right Ascension (B1950)(min)
89- 93 F5.2 s RAo.s ? Optical Right Ascension (B1950)(sec)
94 A1 --- DEo.- ? Optical Declination sign (B1950) (12)
95- 96 I2 deg DEo.d ? Optical Declination (B1950) (deg)
97- 98 I2 arcmin DEo.m ? Optical Declination (B1950) (arcmin)
99-102 F4.1 arcsec DEo.s ? Optical Declination (B1950) (arcsec)
104-108 F5.1 arcsec oRA ? Radio-optical RA offset (13)
110-114 F5.1 arcsec oDE ? Radio-optical Dec offset (13)
116 I1 --- Pf ? Flag indicating which radio position
was adopted (14)
118-119 I2 --- r_ID [1/53]? Reference code (15)
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Note (1): The IAU name is given in the name column. This was not given in
the B3 Catalogue, and was obtained from the B3 position (hours,
minutes, degrees, and tenths of degrees) adding a letter (a, b,
etc.) in order of right ascension, in case of ambiguity. Note
that this designation does not always match the new VLA position,
although this happens rarely. In the case of physically connected
multiple sources, a single name is given if they correspond to a
single source in the B3 Catalogue; however, some sources listed
separately in B3 happen to be parts of the same source
(e.g. 0050+401, 0050+403, and 0050+402B) and in this case they
retain their individual B3 names.
Note (2): The othername column gives the 4C name. If the source is also in
the 3CR Catalogue, the 3CR name is given instead. 3CR names are
recognizable by the format (integer number, or at most one
decimal digit), while 4C names are in the DD.NN format.
Identification with a 4C source is sometimes ambiguous, as
discussed in the B3 Catalogue.
Note (3): This column indicates the source parent subsample. This number
indicates inclusion in the sample as originally selected; for
example, the physical double 0218+399(A+B) is listed as
0218+399A 1
0218+399B 2
since the respective B3 flux densities are 0.36 and 0.49 Jy, and
the components were originally selected as parts of two different
samples. The VLA map showed them to be part of the same source;
consequently the total 408 MHz flux density is now listed as 0.85
Jy (S408 column) and in any subsequent analysis the source will
be considered part of sample 3, 0.8..S..1.6 Jy.
Another example is given by the following double source
0218+402(A+B); only one component (A) was originally included in
sample 2 (although both components are separately listed in B3)
since component B did not meet the selection criteria as given in
the published paper. See the paper for full details.
Note (4): These columns give the B1950 position of the source (or
component). When no source component was detected with the VLA,
the f_S1465 column is marked with an '-' and the given position
is from B3 (Ficarra et al. 1985A&AS...59..255F 1985A&AS...59..255F).
Note (5): The f_S1465 column is marked with a "+" if the source
(component) was resolved, and an integrated flux density is
given. A '-' in the f_S1465 column indicates that the source
component was not detected with the VLA and the given flux is an
upper limit. For these sources, the listed position is from B3.
The S1465 columns gives the source (or component) flux density at
1465 MHz in mJy.
Note (6): This column gives a simple morphological classification of the
radio structure, as follows:
U = unresolved, the synthesized beam is not appreciably broadened.
R = resolved, only one emission peak is present, but the source
map or 'response' is wider than the antenna beam.
D = double source, two emission peaks are present and they appear
to be physically related.
T = triple source, three peaks present and possibly related.
The morphological classification is followed by the source's
largest angular size (LAS), measured in arcseconds. U implies an
(average) upper limit of 5 arcsec; R sources were given a size by
measuring the largest HPBW, and deconvolving it with the antenna
beam; for D and T sources the separation between the (outermost)
components is given.
Note (7): This column gives the total 408 MHz flux density in Jy; generally
it is taken from B3, but for extended, strong sources it has been
remeasured integrating from the B3 map on the structure revealed
by the VLA data.
Note (8): This column gives the spectral index, computed between 1465 and
408 MHz. For multiple sources, the 1465 MHz flux densities have
been added. Alpha is defined in the sense S∝να.
Note (9): This column gives the proposed optical identification, as:
G = galaxy
B = starlike, blue object
N = starlike object of neutral color
Note that the optical identification for multiple sources (e.g.
type D or T) is ONLY given for the FIRST listed component, and
omitted for all others.
A question mark indicates an uncertain optical classification, it
does *not* necessarily indicate an uncertain identification. An
asterisk preceding the optical classification indicates that the
identification was accepted even if it does not meet a uniform
criterion of positional agreement (see the paper for details).
Note that this column is three characters, with the optical
identification being the second character. Thus, to search for
all galaxies, one must search for all sources with a 'G' in this
column
Note (10): For galaxies, the redshift is given in the z column. If a
spectroscopic redshift is available in the literature, the f_z
column is marked with an asterisk (*). In this case the reference
given in the ref column is to the redshift measurement. To
estimate redshifts for those not available in the literature, the
image size was measured and from it the redshift was inferred,
following an established procedure for radio galaxies (Sandage
(1972ApJ...178...25S 1972ApJ...178...25S); Grueff and Vigotti 1979A&AS...35..371G 1979A&AS...35..371G).
The method has been recalibrated using spectroscopic redshifts
available for 33 radio galaxies in our sample. Some of these are
available in the literature, and many were measured by Kron
(1986) as an optical follow-up of this program.
Note (11): For N and B objects, the red magnitude is given, except for some
B objects, whose spectroscopic redshift from the literature is
given.
Note (12): Right ascension and declination of the optical object.
Note (13): These columns give the radio-minus-optical coordinates
differences, in arcsec.
Note (14): This column gives a single digit indicating, for multiple
sources, the radio position adopted as follows:
1 = first component
2 = second component
3 = third component
4 = unweighted average position (midpoint)
5 = weighted average position (radio centroid)
Note (15): This column gives a reference code number. For sources with a
measured redshift, only the reference for the redshift is given;
for 3CR sources, the reader is referred also to Spinrad et al.
(1985PASP...97..932S 1985PASP...97..932S).
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Byte-by-byte Description of file: b3opt.dat
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Bytes Format Units Label Explanations
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1- 2 A2 --- --- [B3]
4- 12 A9 --- B3 B3 radio name, as in file "b3id.dat"
13 A1 --- n_B3 [*] Note on source, detailed in "notes.dat"
16- 17 A2 --- ID [BNG? ] Blue stellar, Neutral stellar or Galaxy
optical type of source
21- 26 F6.4 --- z ? Estimated or measured redshift
28- 31 F4.1 mag Rmag ? Red magnitude
33- 34 I2 h RAh ? Optical Right Ascension (B1950)(hour)
35- 36 I2 min RAm ? Optical Right Ascension (B1950)(min)
37- 41 F5.2 s RAs ? Optical Right Ascension (B1950)(sec)
42 A1 --- DE- ? Optical Declination sign (B1950)
43- 44 I2 deg DEd ? Optical Declination (B1950) (deg)
45- 46 I2 arcmin DEm ? Optical Declination (B1950) (arcmin)
47- 50 F4.1 arcsec DEs ? Optical Declination (B1950) (arcsec)
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Byte-by-byte Description of file: notes.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- B3 Name of source, as in b3id.dat
11-274 A264 --- Text Text of note
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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- 2 I2 --- Ref [1/53] Reference code
4- 22 A19 --- BibCode 19-digit reference (bibcode)
24-216 A193 --- reftxt Full reference text
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History:
* 30-Mar-1999: the catalogue was documented at CDS (Patricio Ortiz) from
a version archived as A016 in H. Andernach's collection (Guanajuato
Univ., Mexico) and the ADS documentation prepared in collaboration
with Carolyn Stern Grant (CfA in Harvard Univ.)
* 08-Dec-1999: in the file "b3id.dat", the DEd of B3 0216+393 was
corrected (is actually +391851 instead of +381851)
* 30-Jul-2013: corrected version by H. Andernach:
errors in the optical coordinates were detected for about 45 objects,
due to the fact that for sources more extended than ∼1' the optical
position may have different RA hour/minutes and DEC arcmins than the
first radio component, which until then was assumed to provide the
leading digits for the optical coordinates (not included in the
printed version). For all objects the error was in the DEC arcmin
except for B3 0246+393, where the error was in RA minutes of time.
Example: for B3 0843+425 the RADECB1950opt (084358.65+423344.8)
should read 084358.65+423444.8.
Other corrections and additions:
-- B3 1327+474C beyond radio-opt.-offset in RA: fixed optical positions,
-- B3 0050+401: according to 1998A&AS..133..129G 1998A&AS..133..129Gregorini+ the core
(actually named B3 0050+402B here) has 4 mJy flux, not 111 mJy!
S408MHz includes that of B3 0050+402B (see notes)
-- the notes to the catalogue (file "notes.dat") was added.
-- the table "b3opt.dat" was added.
(End) Patricio Ortiz, Francois Ochsenbein [CDS] 02-Aug-2013