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The Formation Chronology of Local Group Spiral Galaxies

Published online by Cambridge University Press:  03 August 2017

Ata Sarajedini
Ata Sarajedini*
Affiliation:
Department of Astronomy, University of Florida, P. O. Box 112055, Gainesville, FL 32611-2055, USA

Abstract

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The ‘Second Parameter Effect’ (2ndPE) has long been recognized as an important probe into the formation of spiral galaxies. The concept that the horizontal branch morphologies of globular clusters are primarily affected by metal abundance in the inner halo (RGC<8 kpc) of the Galaxy but require an additional parameter (probably cluster age) to explain their behavior in the outer halo (RGC > 8 kpc), suggests that the former experienced a rapid monotonic collapse while the latter underwent a slower chaotic formation scenario. As such, in the Milky Way, the so-called second parameter boundary is located at 8 kpc. We find that, in the other Local Group spirals — M31 and M33 — this boundary lies at ∼40 kpc and ∼0 kpc, respectively. We therefore speculate that the boundary delimiting rapid monotonic halo collapse from the chaotic accretion of dwarf galaxy fragments is inversely related to the mass of the spiral galaxy.

Type
Part 1. The Star Clusters of Local Group Galaxies
Information
Symposium - International Astronomical Union , Volume 207: Extragalactic Star Clusters , 2002 , pp. 73 - 82
Copyright
Copyright © Astronomical Society of the Pacific 2002 

References

Ajhar, E. A., Grillmair, C. J., Lauer, T. R., Baum, W. A., Faber, S. M., Holtzman, J. A., Lynds, C. R., O'Neil, E. J. Jr. 1996, AJ, 111, 1110 CrossRefGoogle Scholar
Barmby, P., Huchra, J. P., Brodie, J. P., Forbes, D. A., Schroder, L.L., & Grillmair, C. J. 2000, AJ, 119, 727 CrossRefGoogle Scholar
Buonanno, R., Corsi, C., Bellazzini, M., Ferraro, F.R., & Fusi Pecci, F. 1997, AJ, 113, 706 Google Scholar
Chandar, R., Bianchi, L., Ford, H.C., & Sarajedini, A. 2001, AJ, submitted Google Scholar
Christian, C. A., & Schommer, R. A. 1983, ApJ, 275, 92 Google Scholar
Christian, C. A., & Schommer, R. A., 1987, AJ, 93, 557 Google Scholar
Christian, C. A., & Schommer, R. A., 1988, AJ, 95, 704 CrossRefGoogle Scholar
Da Costa, G.S., Armandroff, T.E., Caldwell, N., & Seitzer, P. 1996, AJ, 112, 2576 Google Scholar
Da Costa, G.S., Armandroff, T.E., Caldwell, N., & Seitzer, P., 2000, AJ, 119, 705 Google Scholar
Fusi Pecci, F., Bellazzini, M., Ferraro, F. R., Buonanno, R., & Corsi, C. E. 1996a, in ASP Conf. Ser. Vol. 92, The Formation of the Galactic Halo… Inside and out, ed. Morrison, H. & Sarajedini, A. (San Francisco: ASP), p. 221 Google Scholar
Fusi Pecci, F., Buonanno, R., Cacciari, C., Corsi, C. E., Djorgovski, S. G., Federici, L., Ferraro, F. R., Parmeggiani, G., & Rich, R. M. 1996b, AJ, 112, 1461 CrossRefGoogle Scholar
Fusi Pecci, F., Ferraro, F. R., Bellazzini, M., Djorgovski, S., Piotto, G., & Buonanno, R. 1993, AJ, 105, 1145 Google Scholar
Harris, W. E. 1996, http://physun.mcmaster.ca/~harris/mwgc.dat Google Scholar
Hesser, J. E., & Hartwick, F. D. A. 1976, ApJ, 203, 97 CrossRefGoogle Scholar
Holland, S., Fahlman, G.G., & Richer, H.B. 1997, AJ, 114, 1488 Google Scholar
Layden, A. C., Ritter, L. A., Welch, D. L., & Webb, T. M.A. 1999, AJ, 117, 1313 CrossRefGoogle Scholar
Lee, Y. -W., Demarque, P., & Zinn, R. J. 1994, ApJ, 423, 248 (LDZ) Google Scholar
Lee, Y. -W., Lee, H. -C. Yoon, S. -J., Rey, S. -C., Chaboyer, B., & Sarajedini, A. 2001, submitted Google Scholar
Mironov, A. V. 1972, Soviet Astr. AJ, 16, 105 Google Scholar
Rich, R. M. et al. 1997, ApJ, 484, L25 Google Scholar
Sandage, A., & Wallerstein, G. 1960, ApJ, 131, 598 CrossRefGoogle Scholar
Sandage, A., & Wildey, R. 1967, ApJ, 150, 469 CrossRefGoogle Scholar
Sandquist, E., Bolte, M., Stetson, P. B., & Hesser, J. E. 1996, ApJ, 470, 910 Google Scholar
Sarajedini, A. 1999, in ASP Conf. Ser. Vol. 165, The Third Stromlo Symposium: The Galactic Halo, ed. Gibson, B. K., Axelrod, T. S., & Putnam, M. E. (San Francisco: ASP), p. 295 Google Scholar
Sarajedini, A., Chaboyer, B., & Demarque, P. 1997, PASP, 109, 1321 Google Scholar
Sarajedini, A., Lee, Y. -W., & Lee, D. -H. 1995, ApJ, 450, 712 Google Scholar
Sarajedini, A., Geisler, D., Harding, P., & Schommer, R., 1998, ApJ, 508, L37 Google Scholar
Sarajedini, A., Geisler, D., Schommer, R., & Harding, P. 2000, AJ, 120, 2437 (SGSH) CrossRefGoogle Scholar
Schommer, R. A., Christian, C. A., Caldwell, N., Bothun, G. D., & Huchra, J. 1991, AJ, 101, 873 Google Scholar
Searle, L., & Zinn, R. J. 1978, ApJ, 225, 357 (SZ) Google Scholar
Silbermann, N.A., Smith, H.A., Bolte, M., & Hazen, M.L. 1994, AJ, 107, 1764 Google Scholar
Stetson, P. B., VandenBerg, D. A., & Bolte, M. 1996, PASP, 108, 560 CrossRefGoogle Scholar
Testa, V., Corsi, C.E., Andreuzzi, G., Iannicola, G., Marconi, G., Piersimoni, A.M., & Buonanno, R. 2001, AJ, 121, 916 CrossRefGoogle Scholar
van den Bergh, S. 1967, AJ, 72, 70 Google Scholar
van den Bergh, S. 1999, ARA&A, 9, 273 Google Scholar
van den Bergh, S., & Stephens, S. 1993, AJ, 106, 1853 Google Scholar
Zinn, R. J., & West, M. J. 1984, ApJS, 55, 45 Google Scholar