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High resolution CO observations in M31

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New Aspects of Galaxy Photometry

Part of the book series: Lecture Notes in Physics ((LNP,volume 232))

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Abstract

CO observations towards M31 made with the Onsala 20m telescope, reveal a high degree of inhomogeneity of the emission on the 100 pc scale. When comparing the CO observations made towards the same spiral. arm but with lower resolution, two kinds of emission appear : with the small beam (33") we detected a narrow and bright component, corresponding to giant molecular complexes ; a fainter and broader emission appears only at low resolution, or when adjacent spectra are averaged. This wider emission is interpreted as coming from a lot of small clouds spread all over the beam and thus sharing all the velocities expected from the HI emission.

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References

  • Boulanger F., Stark A.A., Combes, F.; (1981) Astron. & Astrophys 93, Ll.

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Author information

Authors and Affiliations

  1. Ecole Normale Supérieure, Paris Ve and Observatoire de Meudon, 92190, Meudon, France

    F. Boulanger, F. Cascli & F. Combes

  2. Kapteyn Laboratory, Postbus 800, 9700 AV, Groningen, The Netherlands

    F. Boulanger

  3. Stockholm Observatorium, Saltsjöbaden, Sweden

    J. Bystedt

Authors
  1. F. Boulanger
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  2. J. Bystedt
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  3. F. Cascli
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  4. F. Combes
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Jean-Luc Nieto

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© 1985 Spriner-Verlag

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Boulanger, F., Bystedt, J., Cascli, F., Combes, F. (1985). High resolution CO observations in M31. In: Nieto, JL. (eds) New Aspects of Galaxy Photometry. Lecture Notes in Physics, vol 232. Springer, Berlin, Heidelberg. https://doi.org/10.1007/BFb0030952

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  • DOI: https://doi.org/10.1007/BFb0030952

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  • Publisher Name: Springer, Berlin, Heidelberg

  • Print ISBN: 978-3-540-15657-4

  • Online ISBN: 978-3-540-39566-9

  • eBook Packages: Springer Book Archive

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