Sign on

SAO/NASA ADS Astronomy Abstract Service

· Find Similar Abstracts (with default settings below)
· Full Refereed Journal Article (PDF/Postscript)
· Full Refereed Scanned Article (GIF)
· References in the article
· Citations to the Article (79) (Citation History)
· Refereed Citations to the Article
· Also-Read Articles (Reads History)
· Translate This Page
Interpretation of deep counts of radio sources
Danese, L.; Franceschini, A.; Toffolatti, L.; de Zotti, G.
AA(Padova, Università, Padua, Italy), AB(Padova, Università, Padua, Italy), AC(Padova, Università, Padua, Italy), AD(Osservatorio Astronomico, Padua, Italy)
Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 318, July 1, 1987, p. L15-L20. Research supported by the Ministero della Pubblica Istruzione and CNR. (ApJL Homepage)
Publication Date:
NASA/STI Keywords:
Galactic Evolution, Luminosity, Radiant Flux Density, Radio Sources (Astronomy), Spiral Galaxies, Astronomical Spectroscopy, Hubble Constant, Interacting Galaxies, Radio Galaxies, Starburst Galaxies
Bibliographic Code:


A new determination of the local radio luminosity function of galaxies allows it to be concluded that unevolving low-luminosity sources cannot account for the observed flattening of the normalized differential source counts below mJy levels. Nor can this feature be produced by the evolving populations that dominate the counts at higher flux densities. The local radio luminosities of spiral galaxies are too low to contribute significantly to the counts above 1 mJy, even in the presence of evolution consistent with the observational constraints; thus the blue galaxy population observed by Kron, Koo, and Windhorst (1985) up to greater than or equal to 10 mJy can hardly be identified with normal spiral galaxies. On the other hand, it is shown that evolving starburst/interacting galaxies can easily account for all the data available so far. The inferred evolution time scale (about 20-25 percent of the Hubble time) is within the expected range for gas consumption in starburst galaxies.

Printing Options

Print whole paper
Print Page(s) through

Return 600 dpi PDF to Acrobat/Browser. Different resolutions (200 or 600 dpi), formats (Postscript, PDF, etc), page sizes (US Letter, European A4, etc), and compression (gzip,compress,none) can be set through the Printing Preferences

More Article Retrieval Options

HELP for Article Retrieval

Bibtex entry for this abstract   Preferred format for this abstract (see Preferences)


Find Similar Abstracts:

Use: Authors
Keywords (in text query field)
Abstract Text
Return: Query Results Return    items starting with number
Query Form
Database: Astronomy
arXiv e-prints