J/A+AS/61/451 The 37W catalogue of radio sources in M31 (Walterbos+ 1985)
A high resolution radio continuum survey of Messier 31. II.
Observations at 1412 MHz, data reduction and the 37W catalogue of radio sources.
Walterbos R.A.M., Brinks E., Shane W.W.
<Astron. Astrophys. Suppl. Ser. 61, 451 (1985)>
=1985A&AS...61..451W 1985A&AS...61..451W
ADC_Keywords: Radio sources
Keywords: galaxies: M 31 - radio continuum radiation - radios sources -
source counts
Abstract:
The radio continuum emission of the spiral galaxy M31 has been mapped
at a wavelength of 21cm with the Westerbork Synthesis Radio Telescope,
at an angular resolution of 23"x35", corresponding to a linear
resolution of 70x115pc. Five fields have been observed which, when
combined, cover the main part of the disk of M31. A catalogue of
sources inside the M31 area with a flux density larger than 1mJy (five
times the rms noise) is presented.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 116 269 The 37W catalogue of radio sources at 1412MHz
(269 entries for 249 sources)
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See also:
J/A+A/373/63 : M31 second ROSAT PSPC survey (Supper+, 2001)
Table 1: Observational data
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Field Field centre Freq BandWidth Observation date
(1950.0)
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C 00 40 00 +41 00 1412 10 01-08/1975 12/1978 07/1979
(1415) (4) (for a few baselines)
NW 00 40 30 +41 40 1412 10 12/1978 07-08/1979
NE 00 43 18 +41 16 1415 4 06-08/1975
SW 00 36 42 +40 44 1412 10 07-09/1978
SE 00 39 30 +40 20 1412 10 07-09/1978
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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- 6 A6 --- Name Radio source designation (37WNNN)
7 A1 ---- m_Name [ABC*] Multiplicity index on Name (1)
10 A1 --- Type [CDETU] Structure type (2)
12- 13 I2 h RAh Right ascension (B1950.0)
15- 16 I2 min RAm Right ascension (B1950.0)
18- 22 F5.2 s RAs Right ascension (B1950.0)
24- 26 F3.2 s e_RAs ? rms uncertainty on RA
28 A1 --- DE- Declination sign (B1950.0)
29- 30 I2 deg DEd Declination (B1950.0)
32- 33 I2 arcmin DEm Declination (B1950.0)
35- 38 F4.1 arcsec DEs Declination (B1950.0)
40- 42 F3.1 arcsec e_DEs ? rms uncertainty on DE
45- 49 F5.1 mJy S1412MHz ? Peak flux density at 1412MHz, corrected for
primary beam attenuation
50 A1 --- n_S1412MHz [*] If *, flux at 1415MHz
52- 55 F4.1 mJy e_S1412MHz ? rms uncertainty on S1412MHz
57- 62 F6.3 --- PBatt Primary beam attenuation factor at the
position of the source, relative to closest
of the five field centres
65- 67 I3 arcsec MajAxis ? Major axis (corrected for the beam)
69- 71 I3 arcsec MinAxis ? Minor axis (corrected for the beam) (3)
73- 75 I3 deg PA ? Position angle along major axis,
measured North through East
77- 81 F5.1 mJy I1412MHz ? Integrated flux density at 1412MHz,
corrected for primary beam attenuation
84- 86 F3.1 mJy e_I1412MHz ? rms uncertainty on I1412MHz
89- 95 A7 --- 36W 36W name, Bystedt et al., 1984A&AS...56..245B 1984A&AS...56..245B
97-104 A8 --- 5C 5C3 name (Pooley, 1969MNRAS.144..101P 1969MNRAS.144..101P) or KK,
Van der Kruit & Katgert, 1972ApJ....11L.181V 1972ApJ....11L.181V
107-116 A10 --- Notes Notes (4)
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Note (1): Multi-components sources are marked with an asterisk,
and their components are lettered consecutively.
Note (2): Structure:
U: unresolved
E: extended
D: double
T: triple
C: complex
Note (3): Sources resolved in only one direction have minor axis size equal to 0
Note (4): Notes:
C: confused. No exact correspondence is found between the 37W and the
36W source because of confusion at 49cm (36W)
NS: source not subtracted form maps (see Sect. 5)
Extended? : source suspected of being extended from residuals visible
in the map after subtraction of an unresolved source.
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History:
Prepared by Heinz Andernach (R302 in his list)
References:
Bystedt et al., Paper I 1984A&AS...56..245B 1984A&AS...56..245B
(End) Patricia Bauer [CDS] 05-Aug-2002