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We present the observations of the starburst galaxy M82 taken with theHerschel 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 thecentral region of M82. The fundamental properties of the gas are wellconstrained by the high J lines observed for the first time. Radiative transfermodeling of these high-S/N 12CO and 13CO lines strongly indicates a very warmmolecular gas component at ~500 K and pressure of ~3x10^6 K cm^-3, in goodagreement with the H_2 rotational lines measurements from Spitzer and ISO. Wesuggest that this warm gas is heated by dissipation of turbulence in theinterstellar 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 ofnearby galaxies.

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