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Title:
Spitzer MIPS Infrared Imaging of M31: Further Evidence for a Spiral-Ring Composite Structure
Authors:
Gordon, K. D.; Bailin, J.; Engelbracht, C. W.; Rieke, G. H.; Misselt, K. A.; Latter, W. B.; Young, E. T.; Ashby, M. L. N.; Barmby, P.; Gibson, B. K.; Hines, D. C.; Hinz, J.; Krause, O.; Levine, D. A.; Marleau, F. R.; Noriega-Crespo, A.; Stolovy, S.; Thilker, D. A.; Werner, M. W.
Affiliation:
AA(Steward Observatory, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721; .), AB(Centre for Astrophysics and Supercomputing, Swinburne University of Technology, P.O. Box 218, Hawthorn, VIC 3122, Australia.), AC(Steward Observatory, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721; .), AD(Steward Observatory, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721; .), AE(Steward Observatory, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721; .), AF(NASA Herschel Science Center, Mail Code 100-22, California Institute of Technology, 770 South Wilson Avenue, Pasadena, CA 91125.), AG(Steward Observatory, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721; .), AH(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138.), AI(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138.), AJ(Centre for Astrophysics and Supercomputing, Swinburne University of Technology, P.O. Box 218, Hawthorn, VIC 3122, Australia.; Centre for Astrophysics, University of Central Lancashire, Preston PR1 2HE, UK.), AK(Space Science Institute, 4750 Walnut Street, Suite 205, Boulder, CO 80301.), AL(Steward Observatory, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721; .), AM(Steward Observatory, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721; .), AN(Spitzer Science Center, Mail Code 220-6, California Institute of Technology, 1200 East California Boulevard, Pasadena, CA 91125.), AO(Spitzer Science Center, Mail Code 220-6, California Institute of Technology, 1200 East California Boulevard, Pasadena, CA 91125.), AP(Spitzer Science Center, Mail Code 220-6, California Institute of Technology, 1200 East California Boulevard, Pasadena, CA 91125.), AQ(Spitzer Science Center, Mail Code 220-6, California Institute of Technology, 1200 East California Boulevard, Pasadena, CA 91125.), AR(Center for Astrophysical Sciences, Johns Hopkins University, 3400 North Charles Street, Baltimore, MD 21218.), AS(Jet Propulsion Laboratory, Mail Code 264-767, 4800 Oak Grove Drive, Pasadena, CA 91109.)
Publication:
The Astrophysical Journal, Volume 638, Issue 2, pp. L87-L92. (ApJL Homepage)
Publication Date:
02/2006
Origin:
UCP
ApJ Keywords:
Galaxies: Individual: Messier Number: M31, Galaxies: Individual: Messier Number: M32, Galaxies: Individual: NGC Number: NGC 205, Galaxies: ISM, Galaxies: Spiral
DOI:
10.1086/501046
Bibliographic Code:
2006ApJ...638L..87G

Abstract

New images of M31 at 24, 70, and 160 μm taken with the Multiband Imaging Photometer for Spitzer (MIPS) reveal the morphology of the dust in this galaxy. This morphology is well represented by a composite of two logarithmic spiral arms and a circular ring (radius ~10 kpc) of star formation offset from the nucleus. The two spiral arms appear to start at the ends of a bar in the nuclear region and extend beyond the star-forming ring. As has been found in previous work, the spiral arms are not continuous, but composed of spiral segments. The star-forming ring is very circular except for a region near M32 where it splits. The lack of well-defined spiral arms and the prominence of the nearly circular ring suggest that M31 has been distorted by interactions with its satellite galaxies. Using new dynamical simulations of M31 interacting with M32 and NGC 205, we find that, qualitatively, such interactions can produce an offset, split ring like that seen in the MIPS images.
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