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A Multi-Scale Study of Star Formation in Messier 33 | | E. C. Elson
; S. Z. Kam
; L. Chemin
; C. Carignan
; T. H. Jarrett
; | | Date: |
12 Nov 2018 | | Abstract: | For the Local Group Scd galaxy M 33 this paper presents a multi-scale study
of the relationship between the monochromatic star formation rate (SFR)
estimator based on 12 $mu$m emission and the total SFR estimator based on a
combination of far-ultraviolet and 24 $mu$m emission. We show the 12 $mu$m
emission to be a linear estimator of total SFR on spatial scales from 782 pc
down to 49 pc, over almost four magnitudes in SFR. These results therefore
extend to sub-kpc length scales the analogous results from other studies for
global length scales. We use high-resolution HI and $^{12}mathrm{CO}(J=2-1)$
image sets from the literature to compare the star formation to the neutral
gas. For the full range of length scales we find well-defined power-law
relationships between 12 $mu$m-derived SFR surface densities and neutral gas
surface densities. For the H$_mathrm{2}$ gas component almost all correlations
are consistent with being linear. No evidence is found for a breakdown in the
star formation law at small length scales in M 33 reported by other authors. We
show that the average star formation efficiency in M 33 is roughly $10^{-9}$
yr$^{-1}$ and that it remains constant down to giant molecular cloud length
scales. Toomre and shear-based models of the star formation threshold are shown
to inaccurately account for the star formation activity in the inner disc of M
33. Finally, we clearly show that the HI saturation limit of $approx 9$
M$_{odot}$ pc$^{-2}$ reported in the literature for other galaxies is not an
intrinsic property of M 33 - it is systematically introduced as an artefact of
spatially smoothing the data. | | Source: | arXiv, 1811.4590 | | Services: | Forum | Review | PDF | Favorites | |
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