VIII/53 The Green Bank Survey (Maslowski+ 1972-87)
A Green Bank sky survey in search of radio sources at 1400 MHz. III.
Positions and flux densities of the GB radio sources.
Maslowski J.
<Acta Astron. 22, 227 (1972)>
=1972AcA....22..227M 1972AcA....22..227M
The Green Bank second survey of extragalactic radio sources at 1400 MHz.
The catalogue of sources.
Machalski J.
<Acta Astron. 28, 367 (1978)>
=1978AcA....28..367M 1978AcA....28..367M
The Green Bank third (GB3) survey of extragalactic radiosources at 1400 MHz.
Rys S., Machalski J.
<Acta Astron. 37, 163 (1987)>
=1987AcA....37..163R 1987AcA....37..163R
ADC_Keywords: Radio continuum ; Radio sources ; Surveys
Description:
This catalog presents the parts I, II, and III of the Green Bank
survey of extragalactic radio sources at 1400 MHz. The data were
obtained with the 300' antenna, producing a beamwidth of 10'x11' FWHM.
Part I of the survey covers about 521 square degrees of the sky with
RA from 7h17m to 16h23m, DEC from +45.8° to +51.7°. 1086
sources are presented down to a limiting flux density of 90 mJy. These
data were originally published in Maslowski, 1972, Acta Astronomica,
22, 227 (1972AcA....22..227M 1972AcA....22..227M).
Part II of the survey covers 0.28 sr of the sky with RA from 7h08m to
16h57m, DEC from +31.9° to +39.7°. 2022 sources are presented
down to a limiting flux density of 0.09 mJy. Spectral indices between
1400 MHz and 408 MHz are determined for most sources by comparison
with the B2 source catalog (Cat.VIII/36). These data were originally
published in Machalski 1978, Acta Astronomica, 28, 367
(1978AcA....28..367M 1978AcA....28..367M)
Part III of the survey covers an area of 0.099 sr at declinations
between 70 and 76.8 degrees. This catalog contains a total of 676
radio sources, of which 502 are statistically complete to 112 mJy.
These data were originally published as Rys and Machalski, 1987, Acta
Astronomica, 37, 163 (1987AcA....37..163R 1987AcA....37..163R).
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
gb1.dat 50 1086 Green Bank I Survey at 1400 MHz (Dec: 45d to 52d)
gb2.dat 59 2022 Green Bank II Survey at 1400 MHz (Dec: 32d to 40d)
gb3.dat 50 676 Green Bank III Survey at 1400 MHz (Dec: 70d to 77d)
--------------------------------------------------------------------------------
Byte-by-byte Description of file: gb1.dat gb2.dat gb3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1-13 A13 --- Name Coordinate-designated B1950 name (1)
16-17 I2 h RAh Right Ascension (B1950) (hour) (2)
18-19 I2 min RAm Right Ascension (B1950) (min)
20-23 F4.1 s RAs Right Ascension (B1950) (sec)
24 A1 --- DE- Declination sign (B1950) (2)
25-26 I2 deg DEd Declination (B1950) (deg)
27-28 I2 arcmin DEm Declination (B1950) (arcmin)
29-30 I2 arcsec DEs Declination (B1950) (arcsec)
31 A1 --- pos_flg [ :] Flagged ':' if position is less certain (3)
34-39 F6.3 Jy S1400 Integrated 1400 MHz flux density in Jy (4)
40 A1 --- u_S1400 [ :] ':' if flux is less certain (4)
42-45 F4.2 Jy S1400p ? Peak 1400 MHz flux density in Jy (4)
48-51 A4 --- flags Source flags (5)
54-57 F4.2 --- Sp-Index ? Spectral index between 1400 MHz and 408 MHz (6)
58-59 A2 --- u_Sp-Index [ :*] ':' if spectral index is less certain (6)
--------------------------------------------------------------------------------
Note (1): This column contains the name of the source, derived from its
B1950 coordinates. Names have been designated with a 'GBx', where 'x'
is 1 , 2, or 3, followed by the hours and minutes of RA, declination
sign, then degrees and truncated minutes (e.g. 'GB2 0714+384'). For a
few objects close to each other, a duplication of names was avoided by
appending an "A" or "B" to the name.
Note (2): These columns give the B1950 coordinates of the source, in
degrees and in radians. Positional uncertainties for GB3 in RA and DEC
are estimated to be:
ra_err = ±[(0.45)2 + (120/S)2]1/2 arcmin
dec_err = ±[(0.39)2 + (165/S)2]1/2 arcmin
where flux density S is expressed in mJy.
Note (3): pos_flg is flagged with a colon ':' if the position is less
certain. In these cases the positional uncertainty is larger than that
expressed above.
Note (4): The integrated 1400 MHz flux is given in the S1400 column, in
Jy. The u_S1400 column is marked with a colon ':' if the integrated flux
is uncertain. The S1400p column gives the peak 1400 MHz flux density,
when known.
Note (5): This column gives flags on the source. An 'X' indicates that the
source-fitting routine found an extension in RA. A 'Y' indicates a
corresponding extension in declination. It is likely that in most
cases such extension is caused by confusing faint sources. An
evidently confused source is indicated by 'C'. Note that the X is
always in the first column; the Y is always in the second column; and
the C is always in the third column. Thus, a confused source has this
column equal to ' C'. A question mark indicates uncertainty.
Note (6): The 'Sp-Index' column gives the spectral index between the 1400 MHz
flux density and the 408 MHz flux density from the B2 survey, GV
survey (Grueff and Vigotti 1968ApL.....2..113G 1968ApL.....2..113G), or the WK survey
(Windram and Kenderdine 1969MNRAS.146..265W 1969MNRAS.146..265W).
A colon in the 'u_Sp-Index' column indicates a less certain spectral
index. An asterisk ('*') in the u_Sp-Index column corresponds to
indices given in brackets in the published paper, i.e. very uncertain
spectral indices. Note that no corrections were made to the original
flux density data in the other catalogs.
'Sp-Index' and 'u_Sp-Index' appear in table 'gb2.dat' only.
--------------------------------------------------------------------------------
History:
"The catalogue was originally archived as A055 by H. Andernach
() and the ADS documentation prepared in
collaboration with Carolyn Stern Grant ()."
* 22-Dec-1999: two errors in file gb1.dat corrected at CDS
GB1 1003+498 was written GB1 0103+498, with wrong RA hours, and
GB1 1203+506 was written GB1 1202+506, with wrong RA minutes
(End) Francois Ochsenbein [CDS] 14-Apr-1999