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 (1476) (Citation History)
· Refereed Citations to the Article
· SIMBAD Objects (33)
· NED Objects (34)
· Also-Read Articles (Reads History)
· HEP/Spires Information
·
· Translate This Page
Title:
The star formation law in galactic disks
Authors:
Kennicutt, Robert C., Jr.
Affiliation:
AA(Steward Observatory, Tucson, AZ)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 344, Sept. 15, 1989, p. 685-703. (ApJ Homepage)
Publication Date:
09/1989
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
Galactic Evolution, H Alpha Line, H Ii Regions, Interstellar Gas, Star Formation Rate, Emission Spectra, Gas Dynamics, Radial Distribution, Spiral Galaxies
DOI:
10.1086/167834
Bibliographic Code:
1989ApJ...344..685K

Abstract

Measurements of the distribution of H-alpha emission in galaxies are combined with published H I and CO data in order to reassess the dependence of the massive star formation rate (SFR) on the density and dynamics of the interstellar gas. The disk-averaged H-alpha surface brightness is correlated with the mean atomic and total gas surface densities, but is only weakly correlated with the mean molecular gas density inferred from CO emission. Radial profiles of gas and H-alpha emission in 15 galaxies are used to define the relationship between the SFR and gas surface density. In dense regions, the SFR and total gas density are well-represented by a Schmidt power-law relation. This Schmidt law breaks down, however, at densities below a critical threshold value. Massive star formation is completely suppressed at surface densities well below the threshold, while at densities near the threshold value the slope of the SFR-density relation is much steeper than a normal Schmidt law. A simple Toomre disk stability model predicts threshold densities and radii which are in excellent agreement with observations.

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