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The timescales of chemical enrichment in the Galaxy

Published online by Cambridge University Press:  01 October 2008

Antonio Pipino
Affiliation:
Physics & Astronomy, University of Southern California, Los Angeles 90089-0484, USA email: pipino@usc.edu
Francesca Matteucci
Affiliation:
Dipartimento di Astronomia, Universita'di Trieste, via GB Tiepolo 11, 34100 Trieste, Italy
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Abstract

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The time-scales of chemical enrichment are fundamental to understand the evolution of abundances and abundance ratios in galaxies. In particular, the time-scales for the enrichment by SNe II and SNe Ia are crucial in interpreting the evolution of abundance ratios such as [α/Fe]. In fact, the α-elements are produced mainly by SNe II on time-scales of the order of 3 to 30 Myr, whereas the Fe is mainly produced by SNe Ia on a larger range of time-scales, going from 30 Myr to a Hubble time. This produces differences in the [α/Fe] ratios at high and low redshift and it is known as “time-delay” model. In this talk we review the most common progenitor models for SNe Ia and the derived rates together with the effect of the star formation history on the [α/Fe] versus [Fe/H] diagram in the Galaxy. From these diagrams we can derive the timescale for the formation of the inner halo (roughly 2 Gyr), the timescale for the formation of the local disk (roughly 7-8 Gyr) as well the time-scales for the formation of the whole disk. These are functions of the galactocentric distance and vary from 2-3 Gyr in the inner disk up to a Hubble time in the outer disk (inside-out formation). Finally, the timescale for the formation of the bulge is found to be no longer than 0.3 Gyr, similar to the timescale for the formation of larger spheroids such as elliptical galaxies. We show the time-delay model applied to galaxies of different morphological type, identified by different star formation histories, and how it constrains differing galaxy formation models.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2009

References

Alibés, A., Labay, J., & Canal, R., 2001, A&A, 370, 1103Google Scholar
Ballero, S., Matteucci, F., Origlia, L., & Rich, R. M. 2007, A&A, 467, 123Google Scholar
Boissier, S. & Prantzos, N., 1999, MNRAS, 307, 857CrossRefGoogle Scholar
Chiappini, C., 2008, in: Funes, J., Corsini, S. J., E. M., (eds.), Formation and Evolution of Galaxy Disks, ASP Conference Series, Vol. 396, (San Francisco: ASP), p.113Google Scholar
Chiappini, C., Matteucci, F., & Gratton, R. 1997, ApJ, 477, 765CrossRefGoogle Scholar
Chiappini, C., Matteucci, F., & Romano, D., 2001, ApJ, 554, 1044CrossRefGoogle Scholar
Dopita, M. A. & Ryder, S. D., 1994, ApJ, 430, 163CrossRefGoogle Scholar
Eggen, O. J., Lynden-Bell, D., & Sandage, A. R., 1962, ApJ, 136, 748CrossRefGoogle Scholar
Elmegreen, B. G., 1999, ApJ, 517, 103CrossRefGoogle Scholar
Ferreras, I., Wyse, F. G., & Silk, J., 2003, MNRAS, 345, 1381CrossRefGoogle Scholar
Françcois, P., Matteucci, F.Cayrel, R., Spite, M., Spite, F., & Chiappini, C., 2004, A&A, 421, 613Google Scholar
Fulbright, J. P., McWilliam, A., & Rich, R. M., 2006, ApJ, 636, 831CrossRefGoogle Scholar
Fulbright, J. P., McWilliam, A., & Rich, R. M., 2007, ApJ, 661, 1152CrossRefGoogle Scholar
Greggio, L., 2005, A&A, 441, 1055Google Scholar
Greggio, L. & Renzini, A., 1983, A&A, 118, 217Google Scholar
Han, Z. & Podsiadlowski, Ph., 2004, MNRAS, 350, 1301CrossRefGoogle Scholar
Iben, I. Jr. & Tutukov, A., 1984, ApJ, 284, 719CrossRefGoogle Scholar
Kennicutt, R. C. Jr., 1998a, ApJ, 498, 541CrossRefGoogle Scholar
Kennicutt, R. C. Jr., 1998b, ARA&A, 36, 189Google Scholar
Kotoneva, E., Flynn, C., Chiappini, C., & Matteucci, F. 2002, MNRAS, 336, 879CrossRefGoogle Scholar
Lecureur, A., Hill, V., Zoccali, M., Barbuy, B., Gomez, A., Minniti, D., Ortolani, S., & Renzini, A., 2007, A&A, 465, 799Google Scholar
Mannucci, F., Della Valle, M., Panagia, N., Cappellaro, E., Cresci, G., Maiolino, R., Petrosian, A., & Turatto, M., 2005, A&A, 433, 807Google Scholar
Mannucci, F., Della Valle, M., & Panagia, N., 2006, MNRAS, 370, 773CrossRefGoogle Scholar
Matteucci, F., 2001, The Chemical Evolution of the Galaxy, ASSL, Kluwer Academic PublisherGoogle Scholar
Matteucci, F. 2008, in: Grebel, E. and Moore, B. (eds.), The Origin of the Galaxy and the Local Group, astro-ph/0804.1492Google Scholar
Matteucci, F. & Brocato, E., 1990, ApJ, 365, 539CrossRefGoogle Scholar
Matteucci, F. & Françcois, P., 1989, MNRAS, 239, 885CrossRefGoogle Scholar
Matteucci, F. & Greggio, L., 1986, A&A, 154, 279Google Scholar
Matteucci, F. & Recchi, S., 2001, ApJ, 558, 351CrossRefGoogle Scholar
Matteucci, F., Romano, D., & Molaro, P., 1999, A&A, 341, 458Google Scholar
Meynet, G. & Maeder, A., 2002, A&A, 390, 561Google Scholar
Nomoto, K., Tominaga, N., Umeda, H., Kobayashi, C., & Maeda, K., 2006, Nucl. Phys. A, 777, 424CrossRefGoogle Scholar
Pipino, A., Devriendt, J. E. G., Thomas, D., Silk, J., & Kaviraj, S., 2008a, submitted, arXiv0810.5753Google Scholar
Pipino, A. & Matteucci, F. 2004, MNRAS, 347, 968CrossRefGoogle Scholar
Pipino, A., Matteucci, F., & D'Ercole, A., 2008b, IAUS, 245, 19Google Scholar
Pipino, A., Silk, J., & Matteucci, F., 2008c, MNRAS, in press, arXiv0810.2045Google Scholar
Prantzos, N., 2003, A&A, 404, 211Google Scholar
Prantzos, N. & Boissier, S., 2000, MNRAS, 313, 338CrossRefGoogle Scholar
Rich, R. M. & McWilliam, A., 2000, in: Bergeron, Jacqueline (ed.), Discoveries and Research Prospects from 8- to 10-Meter-Class Telescopes, Proc. SPIE Vol. 4005, p. 150Google Scholar
Salpeter, E. E., 1955, ApJ, 121, 161CrossRefGoogle Scholar
Scalo, J. M., 1986, Fund. Cosmic Phys., 11, 1Google Scholar
Schmidt, M., 1959, ApJ, 129, 243CrossRefGoogle Scholar
Thielemann, F. K., Nomoto, K., & Hashimoto, M., 1996, ApJ, 460, 408CrossRefGoogle Scholar
Tinsley, B. M., 1980, Fund. Cosmic Phys. Vol. 5, 287Google Scholar
Tinsley, B. M., 1979, ApJ, 229, 1046CrossRefGoogle Scholar
Whelan, J. & Iben, I. Jr., 1973, ApJ, 186, 1007CrossRefGoogle Scholar
White, S. D. M. & Rees, M. J., 1978, MNRAS, 183, 341CrossRefGoogle Scholar
Woosley, S. E. & Weaver, T. A., 1995, ApJS, 101, 181CrossRefGoogle Scholar
Zoccali, M., Lecureur, A., Barbuy, B., Hill, V., Renzini, A., Minniti, D., Momany, Y., Gómez, A., & Ortolani, S., 2006, A&A, 457, L1Google Scholar