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Article overview
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High-z dusty star-forming galaxies: a top-heavy initial mass function? | | Zhen-Yi Cai
; Gianfranco De Zotti
; Matteo Bonato
; | | Date: |
15 Oct 2019 | | Abstract: | Recent estimates point to abundances of z > 4 sub-mm galaxies far above model
predictions. The matter is still debated. According to some analyses the excess
may be substantially lower than initially thought and perhaps accounted for by
flux boosting and source blending. However, there is no general agreement on
this conclusion. An excess of z > 6 dusty galaxies has also been reported
albeit with poor statistics. On the other hand, Zhang et al. (2018) reported
evidence of a top-heavy initial mass function (IMF) in high-z galaxies. This
would translate into higher a sub-mm luminosity of dusty galaxies at fixed
star-formation rate (SFR), i.e., into a higher abundance of high-z galaxies
than expected for an universal IMF. Exploiting the physical model by Cai et al.
(2013) we argue that some excess can be understood in terms of a somewhat
top-heavier IMF for proto-spheroidal galaxies compared to late-type galaxies.
Such IMF is consistent with that advocated by Zhang et al. (2018) to account
for the low $^{13}$C/$^{18}$O abundance ratio measured by them in four $z=2$--3
dusty galaxies. However, the IMF impact on the star formation history of
galaxies is far less dramatic than suggested by these authors and extreme
top-heavy IMFs are inconsistent with the data. | | Source: | arXiv, 1910.6970 | | Services: | Forum | Review | PDF | Favorites | |
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