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• W4361198860 abstract "Compression in giant molecular cloud (GMC) collisions is a promising mechanism to trigger formation of massive star clusters and OB associations. We simulate colliding and non-colliding magnetised GMCs and examine the properties of prestellar cores, selected from projected mass surface density maps, including after synthetic {it ALMA} observations. We then examine core properties, including mass, size, density, velocity, velocity dispersion, temperature and magnetic field strength. After four Myr, $sim1,000$ cores have formed in the GMC collision and the high-mass end of the core mass function (CMF) can be fit by a power law $dN/d{rm{log}}Mpropto{M}^{-alpha}$ with $alphasimeq0.7$, i.e., relatively top-heavy compared to a Salpeter mass function. Depending on how cores are identified, a break in the power law can appear around a few $times10:M_odot$. The non-colliding GMCs form fewer cores with a CMF with $alphasimeq0.8$ to 1.2, i.e., closer to the Salpeter index. We compare the properties of these CMFs to those of several observed samples of cores. Considering other properties, cores formed from colliding clouds are typically warmer, have more disturbed internal kinematics and are more likely to be gravitational unbound, than cores formed from non-colliding GMCs. The dynamical state of the protocluster of cores formed in the GMC-GMC collision is intrinsically subvirial, but can appear to be supervirial if the total mass measurement is affected by observations that miss mass on large scales or at low densities." @default.
• W4361198860 created "2023-03-31" @default.
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• W4361198860 date "2023-03-28" @default.
• W4361198860 modified "2023-10-16" @default.
• W4361198860 title "GMC collisions as triggers of star formation – VIII. The core mass function" @default.
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• W4361198860 doi "https://doi.org/10.1093/mnras/stad777" @default.
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