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

Published online by Cambridge University Press:  01 August 2006

David L. Block
Affiliation:
Anglo American Cosmic Dust Laboratory, School of Computational and Applied Mathematics, University of Witwatersrand, Johannesburg, 2050, South Africa email: block@cam.wits.ac.za
Ivânio Puerari
Affiliation:
Instituto Nacional de Astrofísica, Optica y Electrónica, Tonantzintla, 72840, México email: puerari@inaoep.mx
Giovanni G. Fazio
Affiliation:
Harvard-Smithsonian Center for Astrophysics, 60 Garden St., Cambridge, MA 02138, USA email: gfazio@cfa.harvard.edu
Alan Stockton
Affiliation:
Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu, Hawaii, USA email: stockton@ifa.hawaii.edu
Gabriela Canalizo
Affiliation:
Institute of Geophysics and Planetary Physics and Department of Physics, University of California, Riverside, CA 92521, USA
Kenneth C. Freeman
Affiliation:
Mount Stromlo and Siding Spring Observatories, Research School of Astronomy and Astrophysics, Australian National University, Australia email: kcf@mso.anu.edu.au
Thomas H. Jarrett
Affiliation:
Infrared Processing and Analysis Centre, 100-22, CALTECH, 770 South Wilson Ave, Pasadena, CA 91125, USA email: jarrett@ipac.caltech.edu
Françoise Combes
Affiliation:
Observatoire de Paris, LERMA, 61 Av. de l'Observatoire, F-75014, Paris, France email: francoise.combes@obspm.fr
Robert Groess
Affiliation:
Anglo American Cosmic Dust Laboratory, School of Computational and Applied Mathematics, University of Witwatersrand, Johannesburg, 2050, South Africa email: block@cam.wits.ac.za
Guy Worthey
Affiliation:
Washington State University, 1245 Webster Hall, Pullman, WA 99163-2814, USA email: gworthey@wsu.edu
Robert D. Gehrz
Affiliation:
Department of Astronomy, University of Minnesota, 116 Church St. SE, Minneapolis MN 55455, USA email:gehrz@astro.umn.edu
Charles E. Woodward
Affiliation:
Department of Astronomy, University of Minnesota, 116 Church St. SE, Minneapolis MN 55455, USA email:gehrz@astro.umn.edu
Elisha F. Polomski
Affiliation:
Department of Astronomy, University of Minnesota, 116 Church St. SE, Minneapolis MN 55455, USA email:gehrz@astro.umn.edu
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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 disk. The northern arc spans ~120 degrees in azimuth and up to 5 arcmin in width. The arcs are located 2-3 disk scale lengths from the galaxy centre (where 1 disk scale length is equivalent to 0.1 degrees in the V-band) and lie precisely where there is a warp in the HI profile of M33. Warps and infall are inextricably linked (Binney, 1992). We present spectroscopy of candidate stars in the outer northern arc, secured using the Keck I telescope in Hawaii. The target stars have estimated visual magnitudes as faint as V~ 25m. Absorption bands of CN are seen in all spectra reported in this review talk, confirming their carbon star status. Also presented are PAH emissivity radial profiles generated from IRAC observations of M33 using the Spitzer Space Telescope. A dramatic change of phase in the m = 2 Fourier component is detected at the domain of the arcs. M33 serves as an excellent example how the disks of spiral galaxies in our Universe are built: as dynamically open systems, growing from the inward, outward.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2007

References

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