A STATISTICAL STUDY OF THE SPECTRAL INDEX DISTRIBUTION OF RADIOSOURCES SELECTED AT 408 MHZ

Authors
GRUEFF G VIGOTTI M BASSO L
Citation
G. Grueff et al., A STATISTICAL STUDY OF THE SPECTRAL INDEX DISTRIBUTION OF RADIOSOURCES SELECTED AT 408 MHZ, Astronomy and astrophysics, 304(2), 1995, pp. 357-364
Citations number
26
Categorie Soggetti
Astronomy & Astrophysics
Journal title
Astronomy and astrophysics → ACNP
ISSN journal
00046361
Volume
304
Issue
2
Year of publication
1995
Pages
357 - 364
Database
ISI
SICI code
0004-6361(1995)304:2<357:ASSOTS>2.0.ZU;2-O
Abstract
We used two large, statistically complete Catalogs of radio sources, t he B3 (408 MHz) and the 87GB (4850 MHz), to study spectral index distr ibution versus flux density. We derived the relation spectral index-fl ux density in the range 30-4000 mJy (408 MHz) and we introduced a new definition of average spectral index of a radiosource population. We f ound that there is no evidence of any change in the average spectral i ndex within the above-mentioned flux range, and that the sky distribut ion of spectral index is isotropic.