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

Panuzzo, P, Rangwala, N, Rykala, A, Isaak, KG, Glenn, J, Wilson, C D, Oliver, S and et al, (2010) Probing the molecular interstellar medium of M82 with Herschel-SPIRE spectroscopy. Astronomy and Astrophysics, 518. ISSN 0004-6361

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We present the observations of the starburst galaxy M82 taken with the Herschel SPIRE Fourier-transform spectrometer. The spectrum (194-671 mu m) 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 (CO)-C-12 and (CO)-C-13 lines strongly indicates a very warm molecular gas component at similar to 500 K and pressure of similar to 3 x 10(6) 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

Item Type: Article
Additional Information: There are other co-authors not entered at al.
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Depositing User: Seb Oliver
Date Deposited: 06 Feb 2012 21:06
Last Modified: 07 Jun 2012 10:32
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