| 16th of August 2017 |
|---|
|
| Stars lose memory about the HI gas |
| by Jing Wang (KIAA) |
| The Local Volume HI Survey
(LVHIS) team has recently finished a paper (arXiv:1708.02744)
studying the star formation rate (SFR)-HI relations in galaxies. The lack of
correlation between HI and SFR was well established by studies that investigate
kpc-scale regions in the inner parts of galaxies, but correlations appeared
to revive on the global scales and in the outskirts of galaxies. This paper
makes use of the 82 LVHIS galaxies observed at ATCA, and coherently studies
the SFR-HI relations in these different regions. They find that those apparent
correlations are caused by both parameters dependent on a third parameter, and
are intrinsically weak. Although HI is the raw material for forming stars,
many factors (e.g. metallicity, magnetic fields, turbulence) and complex
physical processes have affected the formation, and as a result the formed
stars have lost most of the memories about the HI gas. Reference: Jing Wang et al. 2017, MNRAS, in press |