有哪些信誉好的足球投注网站Quantifying the Drivers of Star Formation on Galactic Scales. I. The Small Magellanic Cloud.pdf
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Quantifying the Drivers of Star Formation on Galactic Scales. I. The Small Magellanic Cloud
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Draft version February 2, 2008
Preprint typeset using LATEX style emulateapj v. 7/15/03
QUANTIFYING THE DRIVERS OF STAR FORMATION ON GALACTIC SCALES. I. THE SMALL
MAGELLANIC CLOUD
Dennis Zaritsky
Steward Observatory, University of Arizona, 933 N. Cherry Ave., Tucson, AZ 85721, USA; dzaritsky@as.arizona.edu
Jason Harris?
Space Telescope Science Institute, 3700 San Martin Dr., Baltimore, MD, 21218, USA
Draft version February 2, 2008
ABSTRACT
We use the star formation history of the Small Magellanic Cloud (SMC) to place quantitative limits
on the effect of tidal interactions and gas infall on the star formation and chemical enrichment history
of the SMC. The coincident timing of two recent ( 4 Gyr) increases in the star formation rate and
SMC/Milky Way(MW) pericenter passages suggests that global star formation in the SMC is driven
at least in part by tidal forces due to the MW. The Large Magellanic Cloud (LMC) is the other
potential driver of star formation, but is only near the SMC during the most recent burst. The poorly
constrained LMC-SMC orbit is our principal uncertainty. To explore the correspondence between
bursts and MW pericenter passages further, we model star formation in the SMC using a combination
of continuous and tidally-triggered star formation. The behavior of the tidally-triggered mode is a
strong inverse function of the SMC-MW separation (preferred behavior ～ r?5, resulting in a factor of
～ 100 difference in the rate of tidally-triggered star formation at pericenter and apocenter). Despite
the success of these closed-box evolutionary models in reproducing the recent SMC star formation
history and current chemical abundance, they have some systematic shortcomings that are remedied
by postulating that a sizable infall event (～ 50% of the total gas mass) occurred ～ 4 Gyr ago.
Regardless of whether this infall event is included, the fraction of stars in the SMC that formed via a
tidal
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