Slow Star Formation in the Milky Way: Theory Meets Observations
The observed star formation rate of the Milky Way can be explained by applying a metallicity-dependent factor to convert CO luminosity to molecular gas mass and a star formation efficiency per freefall time that depends on the virial parameter of a molecular cloud. These procedures also predict the...
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| Veröffentlicht in: | Astrophysical journal. Letters 2022-04, Vol.929 (1), p.L18 |
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| creator | Evans, Neal J. Kim, Jeong-Gyu Ostriker, Eve C. |
| description | The observed star formation rate of the Milky Way can be explained by applying a metallicity-dependent factor to convert CO luminosity to molecular gas mass and a star formation efficiency per freefall time that depends on the virial parameter of a molecular cloud. These procedures also predict the trend of star formation rate surface density with Galactocentric radius. The efficiency per freefall time variation with virial parameter plays a major role in bringing theory into agreement with observations for the total star formation rate, while the metallicity dependence of the CO luminosity-to-mass conversion is most notable in the variation with Galactocentric radius. Application of these changes resolves a factor of over 100 discrepancy between observed and theoretical star formation rates that has been known for nearly 50 yr. |
| doi_str_mv | 10.3847/2041-8213/ac6427 |
| format | Article |
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| subjects | Carbon monoxide Luminosity Metallicity Milky Way Molecular clouds Molecular gases Parameters Star & galaxy formation Star formation Star formation rate |
| title | Slow Star Formation in the Milky Way: Theory Meets Observations |
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