NAOC Open IR  > 光学天文研究部
Star formation and chemical evolution of damped Lyman alpha systems
Ma, J; Shu, CG
2001-04-21
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume322Issue:4Pages:927-932
AbstractIn this paper, we investigate the star formation and chemical evolution of damped Lyman LY systems (DLAs) based on the disc galaxy formation model developed by Mo, Mao & White. We propose that the DLAs are the central galaxies of less-massive dark haloes present at redshifts z similar to 3, and they should inhabit haloes of moderately low circular velocity. The empirical Schmidt law of star formation rates, and closed box model of chemical evolution that an approximation known as instantaneous recycling is assumed, are adopted. In our models, when the predicted distribution of metallicity for DLAs is calculated, two cases are considered. One is that, using the closed-box model, empirical Schmidt law and star formation time, the distribution of metallicity can be directly calculated. The other is that, when the simple gravitational instability of a thin isothermal gas disc as first discussed by Toomre is considered, the star formation occurs only in the region where the surface density of gas satisfies the critical value, not everywhere of a gas disc. In this case, we first obtain the region where the star formation can occur by assuming that the disc has a flat rotation curve and rotational velocity is equal to the circular velocity of the surrounding dark matter halo, and then calculate the metallicity distribution as in case one. We assume that star formation in each DLA lasts for a period of 1 Gyr from redshifts z = 3. There is only one output parameter in our models, i.e, the stellar yield, which relates to the time of star formation history and is obtained by normalizing the predicted distribution of metallicity to the mean value of 1/13 Z. as presented by Pettini et al.. The predicted metallicity distribution is consistent with the current (rather limited) observational data. A random distribution of galactic discs is taken into account.
KeywordGalaxies : Evolution Galaxies : Formation Galaxies : Stellar Content
Indexed BySCI
Language英语
WOS IDWOS:000168544200024
Citation statistics
Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/8610
Collection光学天文研究部
Affiliation1.Chinese Acad Sci, Beijing Astron Observ, Beijing 100012, Peoples R China
2.Chinese Acad Sci, Natl Astron Observ, Beijing Astrophys Ctr, Beijing 100012, Peoples R China
3.Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China
4.Chinese Acad Sci, Joint Lab Opt Astron, Beijing 100012, Peoples R China
5.Max Planck Inst Astrophys, D-85748 Garching, Germany
Recommended Citation
GB/T 7714
Ma, J,Shu, CG. Star formation and chemical evolution of damped Lyman alpha systems[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2001,322(4):927-932.
APA Ma, J,&Shu, CG.(2001).Star formation and chemical evolution of damped Lyman alpha systems.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,322(4),927-932.
MLA Ma, J,et al."Star formation and chemical evolution of damped Lyman alpha systems".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 322.4(2001):927-932.
Files in This Item:
There are no files associated with this item.
Related Services
Recommend this item
Bookmark
Usage statistics
Export to Endnote
Google Scholar
Similar articles in Google Scholar
[Ma, J]'s Articles
[Shu, CG]'s Articles
Baidu academic
Similar articles in Baidu academic
[Ma, J]'s Articles
[Shu, CG]'s Articles
Bing Scholar
Similar articles in Bing Scholar
[Ma, J]'s Articles
[Shu, CG]'s Articles
Terms of Use
No data!
Social Bookmark/Share
All comments (0)
No comment.
 

Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.