J/A+AS/80/215 Lunar occultations of weak radio sources (Akujor+, 1989)
Meter wavelength structures, flux densities and accurate positions of weak
radio sources.
Akujor C.E., Joshi M.N., Kazes I.
<Astron. Astrophys. Suppl. Ser. 80, 215 (1989)>
=1989A&AS...80..215A 1989A&AS...80..215A (SIMBAD/NED BibCode)
ADC_Keywords: Radio continuum ; Radio sources ; Radio lines
Keywords: weak radio sources: general - catalogues - occultations -
radio spectrum
Description:
This catalog contains the results of lunar occultation observations of
106 radio sources within declination ± 19 degrees at 327 MHz. There
are 171 sources listed in the catalog due to multiple components for
some of the radio sources. Flux densities were measured at 327 MHz by
lunar occultation with the Ooty Telescope. Flux densities have also
been measured at 18 cm (1669 MHz) and 21 cm (1413 MHz) using the
Nancay telescope. Optical identifications on the basis of the radio
positions and angular structures are given. This catalog is a merge of
table 1 and table 2 from the publication.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
radlunar.dat 190 171 Radio Source Parameters From Lunar Occultation,
Observations (-19° to 19°)
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Byte-by-byte Description of file: radlunar.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Name Name of source (1)
10 A1 --- Note [ *] * if a note on the source in the paper (2)
11- 12 A2 --- comp Component of source (2)
14- 15 I2 h RAh Right Ascension (B1950) (hour)
16- 17 I2 min RAm Right Ascension (B1950) (min)
18- 22 F5.2 s RAs Right Ascension (B1950) (sec)
24- 27 F4.2 s e_RAs Error on RA
29 A1 --- DE- Declination sign (B1950)
30- 31 I2 deg DEd Declination (B1950) (deg)
32- 33 I2 arcmin DEm Declination (B1950) (arcmin)
34- 38 F5.2 arcsec DEs Declination (B1950) (arcsec)
40- 43 F4.1 arcsec e_DEs Error on Dec
45- 48 F4.2 Jy S327 ? Flux density at 327 MHz (3)
50- 52 F3.2 Jy e_S327 ? Error on 327 flux density (3)
54- 57 F4.2 Jy S1413 ? Flux density at 1413 MHz (3)
59- 60 F2.1 Jy e_S1413 ? Error on 1413 flux density (3)
63- 66 F4.2 Jy S1669 ? Flux density at 1669 MHz (3)
68- 70 F3.2 Jy e_S1669 ? Error on 1669 flux density (3)
73- 77 F5.2 --- Sp-Index ? Spectral index between 327 and 1669 MHz (4)
79- 83 F5.1 deg PosAng_i ? Position angle of scan in immersion
occultation (5)
85- 88 F4.1 arcsec Beta_i ? Effective resolution achieved along
immersion PA (5)
90- 98 A9 arcsec Size_i Derived angular size of source or comp in
immersion (5)
100-104 F5.1 deg PosAng_e ? Position angle of scan in emersion
occultation (5)
106-109 F4.1 arcsec Beta_e ? Effective resolution achieved along
emersion PA (5)
111-119 A9 arcsec Size_e Derived angular size of source or comp in
emersion (5)
121-125 F5.1 arcsec LAS ? Largest angular size (6)
127-131 F5.1 deg Maj_PA ? Position angle of the major source axis (6)
133-138 A6 --- struct Source structure description (6)
139-144 F6.2 arcsec oRA ? Radio minus optical offset in RA (7)
146-150 F5.1 arcsec oDE ? Radio minus optical offset in Dec (7)
152-155 F4.1 mag Pmag ? Photographic magnitude of optical object (8)
157-165 A9 --- ID Optical object in field (9)
167-168 I2 deg |b| ? Galactic latitude of radio source (|b|) (10)
170-190 A21 --- Oname Most common names of source (1)
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Note (1): The Name column gives the radio source name. The IAU designation
is used throughout. The Oname (other name) column gives the most
common name of the radio source from other catalogs, such as 4C, MG,
PKS etc. Some corrections were made to the data in order that the
source names were consistent between the two tables.
Note (2): The 'Note' column is marked with an asterisk if there are
comments or notes on the source in the published paper. The 'comp'
column gives the individual component name if the source shows more
than a single structure. A 'CN' in this column means the position is
that of the radio centroid.
Note (3): These columns give flux densities and errors at 327 MHz, 1413
MHz, and 1669 MHz. All flux density measurements are in Jy. The 327
MHz flux densities are from the Ooty telescope; the 1413 MHz and 1669
MHz flux densities are from the dual-reflector Nancay Telescope.
Errors include contributions from the integration of the different
observation cycles for each channel, the integration of the channels
for each wavelength, and contributions from conversion to flux
densities using calibrator fluxes. Flux densities were measured on the
scale of Baars, et al. (1977A&A....61...99B 1977A&A....61...99B). One 327 flux density was
changed to make it consistent with table 2 of the published paper. See
details under "History:" below.
Note (4): This column gives the spectral index between 327 MHz and 1669
MHz. 1413 MHz flux densities are used where there is no measurement at
1669 MHz. Alpha is defined as S ∝ nu{(-alpha)}.
Note (5): The PosAng_i column gives the position angle (in degrees) of
scan in immersion occultation. The Beta_i column gives the effective
resolution achieved along the position angle given by PosAng_i. The
Size_i column gives the derived angular size of the whole source or an
individual component along the position angle given by PosAng_i and
with effective resolution given by Beta_i.
The PosAng_e, Beta_e, and Size_e columns give these same quantities,
but for another scan corresponding to occultation emersion.
Note (6): These columns give information on the overall radio structure of
the source. The largest angular size is given (in arcseconds) in the
last column; the corresponding position angle of the major axis (in
degrees) is given in the 'Maj_PA' column; and the source structure is
described in the 'struct' column as follows:
D double
PD probable double
U unresolved
T triple
HT head-tail
Ext indication of extended feature
CH core-halo
Cx complex
Br emission bridge with percentage of flux contained
? indicated structure is not very certain
Note (7): These columns give the radio-minus-optical offset in right
ascension and declination, in arcseconds. The optical positions are
accurate to ∼0.5".
Note (8): This column gives the photographic magnitude of the optical
object, estimated from PSS prints based on the calibrations of King
and Raff (1977). The uncertainties are generally ~± 1 magnitude.
Note (9): This column gives the optical object in the field or an
abbreviation describing the nature of the field. The following
abbreviations are used:
EF empty field
BSO blue stellar object
RSO red stellar object
NSO neutral stellar object
QSO quasi-stellar object
G galaxy
BG blue galaxy
RG red galaxy
CWD crowed field
INP identification not possible for technical reasons
ID attached to the abbreviation means positive or likely
identification and
'?' means identification given is uncertain.
x) refer to references for published optical charts as follows:
a) Hunstead & Jauncey 1970, MNRAS 149, 91.
b) Wills & Wills 1979. (1979ApJS...41..689W 1979ApJS...41..689W)
Lawrence et al.1986. (1986ApJS...61..105L 1986ApJS...61..105L)
c) Bolton et al. 1981, AuJP 34, 445. (1981AuJPh..34..445B 1981AuJPh..34..445B)
d) Wills & Bolton 1969. (1969AuJPh..22..775W 1969AuJPh..22..775W)
e) Lawrence et al. 1986. (1986ApJS...61..105L 1986ApJS...61..105L)
f) Bolton & Wall 1970, AuJP 23, 789.
g) Kapahi et al. 1973. (1973AJ.....78..673K 1973AJ.....78..673K)
Note (10): This column gives the absolute value of the galactic latitude,
|b| of the radio source, in integer degrees.
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History:
"The catalogue was originally archived as A042 by H. Andernach
() and the ADS documentation prepared in
collaboration with Carolyn Stern Grant ()."
The following changes were made to tables 1 and 2, based on flux
comparisons and comparisons with IAU names.
Table 1:
1. changed 0408+169 to 0408+160 to accurately reflect position
2. changed 1313-006 to 1313-066 to accurately reflect position
3. changed dec from -171352.6 to -175352.6 for 1659-178 (texas position)
4. changed 1923-187 to 1823-187 to accurately reflect position
5. changed the 327 flux for 1750-187 from 0.4 to 0.25 so that
it would agree with the value in table 2 (and therefore
alpha would be correct).
Table 2:
1. changed 0031+041 to 0035+041 to agree with table 1
2. changed 0323+152 to 0324+153 to agree with table 1
3. changed 0324+153 to 0324+152 to agree with table 1
4. changed 0408+169 to 0408+160 to accurately reflect position
5. changed 0601+158 to 0601+185 to agree with table 1
6. changed 0743+161 to 0742+161 to agree with table 1
7. removed this line as it has no corresponding source in table 1
probably an incorrect combination of 0743+161 (now changed) and
0746+162:
0743+162 0.45 .04 0.53 .06 -0.11
8. changed 1105+037 to 1105+037a to agree with table 1
9. changed 1214-029 (flux=0.55) to 1214-029a to agree with table 1
10. changed 1214-029 (flux=0.45) to 1214-029b to agree with table 1
11. changed 1313-006 to 1313-066 to accurately reflect position
12. changed 2106-130 to 2106-130a to agree with table 1
--C. Stern Grant 16 Jun 1993
13. 1406-102 B 140663.00 0.05 -101157.9 1.0 0.35 was changed to:
1406-102 B 140646.30 0.05 -101157.9 1.0 0.35
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as a likely correction to the excessive value of 63 in the seconds
of RA (the mean value is 45.48)
P. Ortiz, 12 Apr 1999
References:
Bolton, J.G. and Wall, J.V. 1970, Aust.J.Phys., 23, 789.
Hunstead, R.W. and Jauncey, D.L. 1970, M.N.R.A.S., 149, 91.
King, I. and Raff, M.I. 1977, P.A.S.P., 89, 120.
(End) Patricio Ortiz [CDS] 30-Mar-1999