期刊
ASTROPHYSICAL JOURNAL
卷 722, 期 1, 页码 668-681出版社
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/722/1/668
关键词
galaxies: abundances; galaxies: individual (M82); galaxies: ISM; galaxies: starburst; instrumentation: spectrographs; techniques: spectroscopic
资金
- NSF [AST-0838261, AST-023927, AST-08079900]
- NASA [NAGS-11911, NAGS-12788]
- Research Corporation Award [RI0928]
- Caltech Millikan
- NRAO
- Division Of Astronomical Sciences
- Direct For Mathematical & Physical Scien [838261] Funding Source: National Science Foundation
We present a three-pointing study of the molecular gas in the starburst nucleus of M82 based on 190-307 GHz spectra obtained with Z-Spec at the Caltech Submillimeter Observatory. We present intensity measurements, detections, and upper limits, for 20 transitions, including several new detections of CS, HNC, C2H, H2CO, and CH3CCH lines. We combine our measurements with previously published measurements at other frequencies for HCN, HNC, CS, (CS)-S-34, and HCO+ in a multi-species likelihood analysis constraining gas mass, density and temperature, and the species' relative abundances. We find some (1.7-2.7) x 10(8) M-circle dot of gas with n(H2) between (1-6) x 10(4) cm(-3) and T > 50 K. While the mass and temperature are comparable to values inferred from mid-J CO transitions, the thermal pressure is a factor of 10-20 greater. The molecular interstellar medium is largely fragmented and is subject to ultraviolet irradiation from the star clusters. It is also likely subject to cosmic rays and mechanical energy input from the supernovae, and is warmer on average than the molecular gas in the massive star formation (SF) regions in the Milky Way. The typical conditions in the dense gas in M82's central kiloparsec appear unfavorable for further SF; if any appreciable stellar populations are currently forming, they are likely biased against low-mass stars, producing a top-heavy initial mass function.
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