Testing the Larson relations in massive clumps

Highly Variable Young Massive Stars in Atlasgal Clumps

High-amplitude variability in young stellar objects (YSOs) is usually associated with episodic accretion events. It has not been observed so far in massive YSOs. Here, the high-amplitude variable star sample of Contreras Peña et al. has been used to search for highly variable (ΔK…1 mag) sources coinciding with dense clumps mapped using the 850μm continuum emission by the ATLASGAL survey. A t...

Giant clumps in the FIRE simulations: a case study of a massive high-redshift galaxy

The morphology of massive star-forming galaxies at high redshift is often dominated by giant clumps of mass ∼ 10 − 10 M and size ∼ 100 − 1000 pc. Previous studies have proposed that giant clumps might have an important role in the evolution of their host galaxy, particularly in building the central bulge. However, this depends on whether clumps live long enough to migrate from their original lo...

Property Testing in Massive Graphs

Outflow Feedback Regulated Massive Star Formation in Parsec-Scale Cluster Forming Clumps

We investigate massive star formation in turbulent, magnetized, parsec-scale clumps of molecular clouds including protostellar outflow feedback using three dimensional numerical simulations of effective resolution 2048. The calculations are carried out using a block structured adaptive mesh refinement code that solves the ideal MHD equations including self-gravity and implements accreting sink ...

Massive Stochastic Testing of SQL

Deterministic testing of SQL database systems is human intensive and cannot adequately cover the SQL input domain. A system (RAGS), was built to stochastically generate valid SQL statements 1 million times faster than a human and execute them. This paper describes RAGS and the results from turning it lose on several commercial SQL systems. 1. Testing SQL is Hard Good test coverage of commercial...