Cold dust in the starburst galaxy M 82
نویسنده
چکیده
The starburst galaxy M82 has been mapped at λ1.2 mm using the IRAM 30–m telescope and the MPIfR 19–channel bolometer. The influence of the sidelobe pattern and the CO(2−1) line has been carefully analyzed. Based on this analysis, we conclude that the cold dust does not extend far into the halo as has been previously claimed. The total mass of dust in the inner 3 kpc of the galaxy is 7.5 · 10 M⊙. Assuming a solar gasto-dust ratio, the inferred total mass of gas is 7.5 · 10 M⊙ . Unlike in any other galaxy we find the CO(2−1) line emission to be clearly more extended than the λ1.2mm dust emission. A likely explanation for this exceptional behaviour, seen for the first time in galaxies, is heating of molecular gas by low–energy cosmic rays and soft X–rays in the halo of M82.
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تاریخ انتشار 2000