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 (576) (Citation History)
· Refereed Citations to the Article
· SIMBAD Objects (61)
· NED Objects (63)
· Also-Read Articles (Reads History)
· HEP/Spires Information
· Translate This Page
Past and future star formation in disk galaxies
Kennicutt, Robert C., Jr.; Tamblyn, Peter; Congdon, Charles E.
AA(University of Arizona, Tucson, AZ), AB(University of Arizona, Tucson, AZ), AC(University of Arizona, Tucson, AZ)
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 435, no. 1, p. 22-36 (ApJ Homepage)
Publication Date:
NASA/STI Keywords:
Astronomical Models, Galactic Evolution, Spiral Galaxies, Star Formation, Stellar Luminosity, Time Measurement, Ultraviolet Spectra, Astronomical Photometry, H Alpha Line, Stellar Mass, Ultraviolet Astronomy
Bibliographic Code:


We have combined H-alpha and UBV measurements of 210 nearby Sa-Irr galaxies with new photometric synthesis models to reanalyze the past and future star formation timescales in disks. The integrated photoionization rates and colors of disks are best fitted by a stellar initial mass function (IMF) which is enriched in massive stars by a factor of 2-3 relative to the Scalo solar neighborhood IMF. We have used published surface photometry of spiral galaxies to analyze the star formation histories of disks independent of their bulge properties. The ratio of the current star formation rate (SFR) to the average past rate increases from of order 0.01 in Sa galaxies to 1 in Sc-Irr disks. This confirms that the pronounced change in the photometric properties of spiral galaxies along the Hubble sequence is predominantly due to changes in the star formation histories of disks, and only secondarily to changes in the bulge/disk ratio. A comparison of current SFRs and gas masses of the sample yields median timescales for gas consumption of approximately 3 Gyr, in the absence of stellar recycling. However, a proper time-dependent treatment of the gas return from stars shows that recycling extends the gas lifetimes of disks by factors of 1.5-4 for typical disk parameters. Consequently the current SFRs in many (but not all) disks can be sustained for periods comparable to the Hubble time.

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