期刊
ASTRONOMY & ASTROPHYSICS
卷 518, 期 -, 页码 -出版社
EDP SCIENCES S A
DOI: 10.1051/0004-6361/201014558
关键词
galaxies: ISM; galaxies: starburst; galaxies: individual: M82; ISM: molecules; submillimeter: galaxies
资金
- CSA (Canada)
- NAOC (China)
- CEA, CNES, CNRS (France)
- ASI (Italy)
- MCINN (Spain
- SNSB (Sweden)
- STFC (UK)
- NASA (USA)
- ESA
- STFC [PP/E001173/1, ST/G002630/1, ST/F00267X/1, ST/F002858/1, ST/H001530/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/G002630/1, ST/F00267X/1, PP/E001173/1, PP/E001181/1, ST/F002858/1] Funding Source: researchfish
- UK Space Agency [ST/G003874/1] Funding Source: researchfish
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.
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