Probing the molecular interstellar medium of M82 with Herschel -SPIRE spectroscopy

P. Panuzzo, N. Rangwala, A. Rykala, K.G. Isaak, J. Glenn, C.D. Wilson, R. Auld, M. Baes, M.J. Barlow, G.J. Bendo, J.J. Bock, A. Boselli, M. Bradford, V. Buat, N. Castro-Rodríguez, P. Chanial, S. Charlot, L. Ciesla, D.L. Clements, A. CoorayD. Cormier, Luca Cortese, J.I. Davies, E. Dwek, S.A. Eales, D. Elbaz, T. Fulton, M. Galametz, F. Galliano, W.K. Gear, H.L. Gomez, M. Griffin, S. Hony, L.R. Levenson, N. Lu, S. Madden, B. O'Halloran, K. Okumura, S. Oliver, M.J. Page, A. Papageorgiou, T.J. Parkin, I. Pérez-Fournon, M. Pohlen, E.T. Polehampton, E.E. Rigby, H. Roussel, N. Sacchi, M. Sauvage, B. Schulz, M.R.P. Schirm, M.W.L. Smith, L. Spinoglio, J.A. Stevens, S. Srinivasan, M. Symeonidis, B. Swinyard, M. Trichas, M. Vaccari, L. Vigroux, H. Wozniak, G.S. Wright, W.W. Zeilinger

    Research output: Contribution to journalArticle

    68 Citations (Scopus)

    Abstract

    We present the observations of the starburst galaxy M82 taken with the Herschel SPIRE Fourier-transform spectrometer. The spectrum (194-671 μm) shows a prominent CO rotational ladder from J = 4-3 to 13-12 emitted by the central region of M82. The fundamental properties of the gas are well constrained by the high J lines observed for the first time. Radiative transfer modeling of these high-S/N 12CO and 13CO lines strongly indicates a very warm molecular gas component at ∼500 K and pressure of ∼3×106 K cm-3, in good agreement with the H 2 rotational lines measurements from Spitzer and ISO. We suggest that this warm gas is heated by dissipation of turbulence in the interstellar medium (ISM) rather than X-rays or UV flux from the straburst. This paper illustrates the promise of the SPIRE FTS for the study of the ISM of nearby galaxies. © ESO 2010.
    Original languageEnglish
    Pages (from-to)5
    JournalAstronomy and Astrophysics
    Volume518
    Issue number4
    DOIs
    Publication statusPublished - 2010

      Fingerprint

    Cite this

    Panuzzo, P., Rangwala, N., Rykala, A., Isaak, K. G., Glenn, J., Wilson, C. D., ... Zeilinger, W. W. (2010). Probing the molecular interstellar medium of M82 with Herschel -SPIRE spectroscopy. Astronomy and Astrophysics, 518(4), 5. https://doi.org/10.1051/0004-6361/201014558