NASA Logo, External Link
Facebook icon, External Link to NASA STI page on Facebook Twitter icon, External Link to NASA STI on Twitter YouTube icon, External Link to NASA STI Channel on YouTube RSS icon, External Link to New NASA STI RSS Feed AddThis share icon
 

Record Details

Record 84 of 1118
Galactic evolution. II - Disk galaxies with massive halos
External Online Source: doi:10.1086/153983
Author and Affiliation:
Ostriker, J. P.(Princeton University, New Observatory, Princeton, N.J., United States)
Thuan, T. X.(Princeton University, New Observatory, Princeton, N.J.)
Abstract: Models of galactic evolution are computed in which matter shed by dying halo stars accumulates in a smaller, more rapidly rotating disk. The models are simpler and more successful than one-zone (pure disk) models in that (1) the observed absence of low-metal-abundance low-mass dwarfs is expected, not anomalous and (2) the relative birthrate function (or IMF) need not be a strongly variable function of time in agreement with recent interpretations of observed stellar populations and neutral hydrogen in our own and other galaxies. Even a simple 'Salpeter' IMF for both disk and halo will produce an acceptable model. The model with a halo 'Salpeter' IMF, roughly one-quarter of the mass in the secondary disk, and approximately half the metals produced in the halo seems most compatible with observations of the metal abundance in low-mass stars, the deuterium abundance, halo planetary nebulae, and light from Population II stars, as well as with arguments on the stability of the disk.
Publication Date: Dec 01, 1975
Document ID:
19760033042
(Acquired Dec 01, 1995)
Accession Number: 76A16008
Subject Category: ASTROPHYSICS
Document Type: Journal Article
Publication Information: Astrophysical Journal; p. Dec. 1; 202
Publisher Information: United States
Contract/Grant/Task Num: NSR-31-001-901; NSF GP-34888X; NSF MPS-74-18970; NSF MPS-74-23453; NGR-06-018-001
Financial Sponsor: NASA; United States
Organization Source: Hale Observatories; Pasadena, CA, United States
Princeton Univ. Observatory; NJ, United States
Description: 12p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: GALACTIC EVOLUTION; GALACTIC STRUCTURE; HALOS; STAR DISTRIBUTION; STELLAR EVOLUTION; ASTRONOMICAL MODELS; ELLIPTICAL GALAXIES; GALACTIC RADIATION; MATHEMATICAL MODELS; RADIO ASTRONOMY; SPIRAL GALAXIES; STELLAR MASS
Imprint And Other Notes: Astrophysical Journal, vol. 202, Dec. 1, 1975, pt. 1, p. 353-364.
Miscellaneous Notes: 1975, pt. 1, p. 353-364
Availability Source: Other Sources
› Back to Top
Find Similar Records
NASA Logo, External Link
NASA Official: Gerald Steeman
Site Curator: STI Program
Last Modified: August 15, 2011
Contact Us