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J/AJ/99/1071 1.4 GHz source survey (Condon+ 1990)
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A 1.4 GHz source survey in an area without nearby rich galaxy clusters
Condon J.J., Dickey J.M., Salpeter E.E.
<Astron. J. 99, 1071 (1990)>
=1990AJ.....99.1071C (SIMBAD/NED BibCode)
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ADC_Keywords: Radio sources ; Galaxies, radio
Abstract:
We report on 1.4GHz continuum observations for 56 contiguous VLA
fields, using the D configuration, in a region devoid of nearby, rich
galaxy clusters (at z<0.4). 354 continuum sources are tabulated, with
fluxes down to about 1.5mJy, in an area of about 12degres^+2^. Only
about seven of the 354 radio sources are associated with known rich
galaxy clusters at z>0.4 (tabulated by Gunn, Hoessel, and Oke,
1986ApJ...306...30G). We compare source positions with those from an
optical catalog (generated from a POSS plate with the use of the
Minnesota Automated Plate Scanner) and find mild correlations on
angular scales of order 1arcmin. This suggests some association of
radio sources with galaxy groups (sizes of order 200 kpc) at redshifts
of order z~0.1, even though there are no rich galaxy clusters in this
redshift range.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 35 56 Center of fields and sensitivity of VLA fields
table2.dat 57 354 Radio sources detected by the VLA.
table3.dat 48 130 Large optical galaxies from POSS plates
table4.dat 64 58 Optical objects coincident with radio sources
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Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Field Field number
6- 7 I2 h RAh Right Ascension B1950 of field center (hours)
8- 9 I2 min RAm Right Ascension B1950 of field center (minutes)
10- 11 I2 s RAs [0,60] Right Ascension B1950 (seconds)
12 A1 --- DE- Declination B1950 of field center (sign)
13- 14 I2 deg DEd Declination B1950 of field center (degrees)
15- 16 I2 arcmin DEm Declination B1950 of field center (minutes)
20- 23 F4.2 mJy Srms RMS noise flux density
26- 29 F4.2 mJy Sneg ? Flux level for "negative" detections
32- 35 F4.2 mJy Smin Minimum flux level adopted for detection
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 4 A4 --- Source Source name
5 A1 --- n_Source ['?] Note on Source (1)
7- 9 I3 --- Field Field whose center is closest to the source
10 A1 --- n_Field [*] Note on Field (2)
12 I1 h RAh Right ascension (1950)
14- 15 I2 min RAm Right ascension (1950)
17- 20 F4.1 s RAs Right ascension (1950)
21 A1 --- DE- Declination sign
22- 23 I2 deg DEd Declination (1950)
25- 26 I2 arcmin DEm Declination (1950)
28- 29 I2 arcsec DEs [0,60] Declination (1950)
31- 35 F5.1 mJy Smax Peak flux at 1.4GHz
37- 41 F5.1 mJy Sint Area integrated flux at 1.4GHz
43- 46 F4.2 --- PBC Primary-beam correction factor (3)
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Note (1): ? : slightly suspect detections
' : Smax < 2(PBC)Smin
Note (2): * : the source is fairly close to the center of a second field
Note (3): PBC(t)=exp[10.7t^2^ + 25.3t^4^] where t is the distance from the
source to the field center in degrees.
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Gno Galaxy source Number
6- 7 I2 h RAh Right Ascension B1950 (hours)
8- 9 I2 min RAm Right Ascension B1950 (minutes)
10- 13 F4.1 s RAs Right Ascension B1950 (seconds)
14 A1 --- DE- Declination B1950 (sign)
15- 16 I2 deg DEd Declination B1950 (degrees)
17- 18 I2 arcmin DEm Declination B1950 (minutes)
19- 20 I2 arcsec DEs [0,60] Declination B1950 (seconds)
24- 26 I3 um R65%diam Diameter on red plate at level 65% (1)
29- 31 I3 um R30%diam Diameter on red plate at level 30% (1)
35- 37 I3 um B65%diam Diameter on blue plate at level 65% (1)
40- 42 I3 um B30%diam Diameter on blue plate at level 30% (1)
45- 48 F4.1 mag mZw ? Zwicky magnitude of galaxy
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Note (1): the levels are defined from the transmission density.
Diameters are in microns (1um = 0.067") from the POSS plates 1st epoch
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 4 A4 --- Source Source name, as in table2
5 A1 --- u_Source [?] Uncertainty flag
7 A1 --- Otype [Gf] optical Galaxy or faint object (1)
10- 14 F5.2 mJy Smax Peak flux at 1.4GHz
16- 17 I2 h RAh Right Ascension B1950 (hours)
18- 19 I2 min RAm Right Ascension B1950 (minutes)
20- 23 F4.1 s RAs Right Ascension B1950 (seconds)
24 A1 --- DE- Declination B1950 (sign)
25- 26 I2 deg DEd Declination B1950 (degrees)
27- 28 I2 arcmin DEm Declination B1950 (minutes)
29- 30 I2 arcsec DEs [0,60] Declination B1950 (seconds)
34- 36 I3 um R65%diam Diameter on red plate at level 65% (2)
39- 41 I3 um R30%diam Diameter on red plate at level 30% (2)
46- 48 I3 um B65%diam Diameter on blue plate at level 65% (2)
51- 53 I3 um B30%diam Diameter on blue plate at level 30% (2)
57- 58 I2 arcsec Sep Separation between optical and radio sources
62- 64 I3 --- Gno ? Number in table3 (1)
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Note (1):
'G' indicates a coincidence with a galaxy; when this galaxy was
optically identified in table3, its number is listed in the
last column. These coincidences are listed in table4a of the
publication.
'g' indicates a coincidence with an optical faint or unresolved
objet, originally listed in table4b of the publication.
Note (2): the levels are defined from the transmission density.
Diameters are in microns (1um = 0.067") from the POSS plates 1st epoch
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Acknowledgements:
We thank Heinz Andernach for supplying the tables 1, 3 and 4.
History:
* 14-Nov-1997: table2 prepared via OCR at CDS.
* 14-Dec-1997: an error in R120 declination was detected by
H. Andernach <heinz@polaris.astro.ugto.mx> and corrected.
* 28-Oct-1998: tables 1,3,4 prepared by H. Andernach (catalogue
numbered R187 in his list) were added.
* 03-Nov-1998: an error in table3 (Gno 115 was labelled Gno 117) was
detected by Fabienne Woelfel and corrected
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(End) Marie-Jose Wagner, Patricia Bauer, Francois Ochsenbein [CDS] 28-Oct-1998