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

journal contribution
posted on 2023-06-08, 08:49 authored by P Panuzzo, N Rangwala, A Rykala, KG Isaak, J Glenn, C D Wilson, Seb OliverSeb Oliver, et al
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

History

Publication status

  • Published

Journal

Astronomy and Astrophysics

ISSN

0004-6361

Volume

518

Department affiliated with

  • Physics and Astronomy Publications

Notes

There are other co-authors not entered at al.

Full text available

  • No

Peer reviewed?

  • Yes

Legacy Posted Date

2012-02-06

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