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Application of the Multiphase Model to the Galactic Bulge

Published online by Cambridge University Press:  10 November 2010

G. Tenorio-Tagle
Affiliation:
Instituto de Astrofísica de Canarias, Tenerife
M. Mollá
Affiliation:
Dep. de Física Teórica, Universidad Autónoma de Madrid, 28049-Cantoblanco, Spain
A. I. Díaz
Affiliation:
Dep. de Física Teórica, Universidad Autónoma de Madrid, 28049-Cantoblanco, Spain
F. Ferrini
Affiliation:
Dipartimento di Astronomia, Università di Pisa, Piazza Torricelli 2, 56100-Pisa, Italy
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Summary

We present the application of the multiphase model to the Galactic bulge to assure that this model may be used in all regions. Results show a star formation rate that is higher in the bulge. The logical consequence is a higher metallicity due to the burst of star formation at early phases of the evolution. But when a comparison is made between models applied to an elliptical galaxy and a bulge, a different chemical evolution results: the relation [O/Fe] versus [Fe/H] is not the same for elliptical galaxies and bulges.

The multiphase model

The bulge is the central region of the Galaxy (Frogel, 1988) with a radius of 1–2 kpc and a total mass of ∼1010 M. In the outside region, the bulge connects with the spheroidal halo and with the adjacent disc. Characteristics for the stellar population of this bulge are obtained from observations: stars are old (Terndrup 1988; Lee 1992), metal rich (Gratton & Ortolani 1986; Rich 1988) and spatially distributed in two components (Rich, 1990; IRAS results). There is also a spheroidal metal-poor component without rotation and a more centrally concentrated and more metal-rich component with rotation.

The observed metallicity distribution is well reproduced by a simple “closed box” model. It implies no slow “infall” of gas in this region. Other models for the bulge are those of Arimoto & Yoshii (1987), based on their elliptical galaxy models, and Matteucci & Brocato (1990).

Type
Chapter
Information
Violent Star Formation
From 30 Doradus to QSOs
, pp. 268 - 269
Publisher: Cambridge University Press
Print publication year: 1994

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  • Application of the Multiphase Model to the Galactic Bulge
    • By M. Mollá, Dep. de Física Teórica, Universidad Autónoma de Madrid, 28049-Cantoblanco, Spain, A. I. Díaz, Dep. de Física Teórica, Universidad Autónoma de Madrid, 28049-Cantoblanco, Spain, F. Ferrini, Dipartimento di Astronomia, Università di Pisa, Piazza Torricelli 2, 56100-Pisa, Italy
  • G. Tenorio-Tagle, Instituto de Astrofísica de Canarias, Tenerife
  • Book: Violent Star Formation
  • Online publication: 10 November 2010
  • Chapter DOI: https://doi.org/10.1017/CBO9780511600159.044
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  • Application of the Multiphase Model to the Galactic Bulge
    • By M. Mollá, Dep. de Física Teórica, Universidad Autónoma de Madrid, 28049-Cantoblanco, Spain, A. I. Díaz, Dep. de Física Teórica, Universidad Autónoma de Madrid, 28049-Cantoblanco, Spain, F. Ferrini, Dipartimento di Astronomia, Università di Pisa, Piazza Torricelli 2, 56100-Pisa, Italy
  • G. Tenorio-Tagle, Instituto de Astrofísica de Canarias, Tenerife
  • Book: Violent Star Formation
  • Online publication: 10 November 2010
  • Chapter DOI: https://doi.org/10.1017/CBO9780511600159.044
Available formats
×

Send book to Google Drive

To send content items to your account, please confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your account. Find out more about sending content to Google Drive.

  • Application of the Multiphase Model to the Galactic Bulge
    • By M. Mollá, Dep. de Física Teórica, Universidad Autónoma de Madrid, 28049-Cantoblanco, Spain, A. I. Díaz, Dep. de Física Teórica, Universidad Autónoma de Madrid, 28049-Cantoblanco, Spain, F. Ferrini, Dipartimento di Astronomia, Università di Pisa, Piazza Torricelli 2, 56100-Pisa, Italy
  • G. Tenorio-Tagle, Instituto de Astrofísica de Canarias, Tenerife
  • Book: Violent Star Formation
  • Online publication: 10 November 2010
  • Chapter DOI: https://doi.org/10.1017/CBO9780511600159.044
Available formats
×