J/A+AS/82/41 Spectral index for B3 radio sources (Kulkarni+ 1990)
Spectral index distribution for a sample of sources from the B3 catalogue.
Kulkarni V.K., Mantovani F., Pauliny-Toth I.I.K.
<Astron. Astrophys. Suppl. Ser. 82, 41 (1990)>
=1990A&AS...82...41K 1990A&AS...82...41K (SIMBAD/NED BibCode)
ADC_Keywords: Radio sources
Keywords: radio sources - radio continuum
Abstract:
Flux density measurements at 4730MHz are presented for a sample of 770
radio sources from the B3 catalogue with density S408>0.35Jy. For 429
of these sources flux density measurements at 1410MHz are also
presented. The radio spectral indices derived are used to investigate
the dependence of median spectral index on flux density
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 72 770 List of the observed sources, their flux
densities and spectral indices
table3.dat 44 22 The median spectral index αmed values
for different samples.
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See also:
VIII/37 : The Third Bologna Survey (B3) (Ficarra+ 1985)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- B3 B3 name
11- 12 I2 h RAh Right ascension (1950)
14- 15 I2 min RAm Right ascension (1950)
17- 21 F5.2 s RAs Right ascension (1950)
22 A1 --- DE- Declination sign
23- 24 I2 deg DEd Declination (1950)
26- 27 I2 arcmin DEm Declination (1950)
29- 32 F4.1 arcsec DEs Declination (1950)
34- 38 F5.2 Jy S408MHz Flux density at 408MHz
40- 43 I4 mJy S1410MHz ? Flux density at 1410MHz
44- 45 A2 --- n_S1410MHz [+*abcn ] Note on S1410MHz (1)
47- 50 I4 mJy S4750MHz ? Flux density at 4750MHz
51- 52 A2 --- n_S4750MHz [+*abcn ] Note on S4750MHz (1)
53- 58 F6.3 --- SI1 ? Spectral index between 408MHz and 4750MHz
60- 65 F6.3 --- SI2 ? Spectral index between 408MHz and 1410MHz
67- 72 F6.3 --- SI3 ? Spectral index between 1410MHz and 4750MHz
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Note (1): The following symbols are used:
+: combined flux density (concerns two lines in the printed table),
should be regarded as an upper limit.
*: integrated flux density
a: flux density derived from scans available in one direction only
b: flux density derived from Kuhr et al. (1981AJ.....86..854K 1981AJ.....86..854K)
c: caution
n: not detected
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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- 7 A7 --- Sample Sample name
9- 14 F6.3 Jy Smed Median density flux at 408MHz
16- 20 F5.3 --- SImed Median spectral index or lower limit if n_SImed=l
21 A1 --- n_SImed [l] l: SImed is a lower limit
23- 27 F5.3 --- e_SImed ? rms uncertainty on SImed
29- 33 F5.3 --- SImefu ? Upper limit for median spectral index
36- 38 I3 --- Nsource Number of sources
40- 41 A2 --- Points Point in fig.1
43- 44 A2 --- Ref Refences (1)
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Note (1): kk: Kapahi and Kulkarni, (1986A&A...165...39K 1986A&A...165...39K)
km: Kulkarni and Mantovani, (1985A&AS...61....1K 1985A&AS...61....1K)
pp: present paper
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Table 2: Sample definitions of the sources observed
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Sample Flux Density Range Declination Range Number
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1 2.53 < S 37deg 15' - 47deg 37' 81
2 1.60 < S < 2.53 37deg 15' - 47deg 37' 85
3 1.01 < S < 1.60 38deg 00' - 44deg 30' 111
4 0.80 < S < 1.01 38deg 00' - 44deg 30' 97
5 0.51 < S < 0.80 38deg 00' - 40deg 48' 126
6 0.40 < S < 0.51 38deg 00' - 40deg 48' 128
7 0.35 < S < 0.40 38deg 50' - 40deg 00' 39
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History:
* 16-May-1997: Prepared via OCR at CDS.
* 03-Oct-1998: Thanks to a note by H. Andernach (),
the following changes were made to table1.dat:
- multiplicity letters (A,B) were added in B3 name, according to
B3 catalog (Ficarra et al., 1985, cat. VIII/37).
- the + flags (combined flux densities) where added when appropriate
- four OCR errors where corrected.
(End) James Marcout, Patricia Bauer, Francois Ochsenbein [CDS] 03-Oct-1998