The Building of Galactic Disks Insights from the Triangulum Spiral Galaxy Messier 33.pdf

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The Building of Galactic Disks Insights from the Triangulum Spiral Galaxy Messier 33.pdf

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The Building of Galactic Disks Insights from the Triangulum Spiral Galaxy Messier 33

a r X i v : a s t r o - p h / 0 6 1 0 5 7 5 v 1 1 8 O c t 2 0 0 6 Galaxy Evolution Across the Hubble Time Proceedings IAU Symposium No. 235, 2007 F. Combes J. Palous, eds. c? 2007 International Astronomical Union DOI: 00.0000/X000000000000000X The Building of Galactic Disks: Insights from the Triangulum Spiral Galaxy Messier 33 David L. Block1, Iva?nio Puerari2, Giovanni G. Fazio3, Alan Stockton4, Gabriela Canalizo5, Kenneth C. Freeman6, Thomas H. Jarrett7, Franc?oise Combes8 Robert Groess1, Guy Worthey9, Robert D. Gehrz10, Charles E. Woodward10 and Elisha F. Polomski10 1Anglo American Cosmic Dust Laboratory, School of Computational and Applied Mathematics, University of Witwatersrand, Johannesburg, 2050, South Africa email: block@cam.wits.ac.za 2Instituto Nacional de Astrof??sica, Optica y Electro?nica, Tonantzintla, 72840, Me?xico email: puerari@inaoep.mx 3Harvard-Smithsonian Center for Astrophysics, 60 Garden St., Cambridge, MA 02138, USA email: gfazio@ 4Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu, Hawaii, USA email: stockton@ 5Institute of Geophysics and Planetary Physics and Department of Physics, University of California, Riverside, CA 92521, USA 6Mount Stromlo and Siding Spring Observatories, Research School of Astronomy and Astrophysics, Australian National University, Australia email: kcf@.au 7Infrared Processing and Analysis Centre, 100-22, CALTECH, 770 South Wilson Ave, Pasadena, CA 91125, USA email: jarrett@ 8Observatoire de Paris, LERMA, 61 Av. de l’Observatoire, F-75014, Paris, France email: bes@obspm.fr 9Washington State University, 1245 Webster Hall, Pullman, WA 99163-2814, USA email: gworthey@ 10Department of Astronomy, University of Minnesota, 116 Church St. SE, Minneapolis MN 55455, USA email:gehrz@ Abstract. The Triangulum Spiral Galaxy Messier 33 offers unique insights into the building of a galactic disk. We identify spectacular arcs of intermediate age (0.6 Gyr ? 2 Gyr) stars in the low-metallicity outer