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44 papers · 2 filters
Future Prospects: Deep Imaging of Galaxy Outskirts using Telescopes Large and Small
Roberto Abraham, Pieter van Dokkum, Charlie Conroy +5
The Universe is almost totally unexplored at low surface brightness levels. In spite of great progress in the construction of large telescopes and improvements in the sensitivity o…
Stars with fast Galactic rotation observed in Gaia TGAS: a signature driven by the Perseus arm?
Jason A. S. Hunt, Daisuke Kawata, Giacomo Monari +3
We report on the detection of a small overdensity of stars in velocity space with systematically higher Galactocentric rotation velocity than the Sun by about 20 km s in the…
Probes of turbulent driving mechanisms in molecular clouds from fluctuations in synchrotron intensity
C. A. Herron, C. Federrath, B. M. Gaensler +3
Previous studies have shown that star formation depends on the driving of molecular cloud turbulence, and differences in the driving can produce an order of magnitude difference in…
Polarization Gradient Study of Interstellar Medium Turbulence Using The Canadian Galactic Plane Survey
C. A. Herron, J. Geisbuesch, T. L. Landecker +5
We have investigated the magneto-ionic turbulence in the interstellar medium through spatial gradients of the complex radio polarization vector in the Canadian Galactic Plane Surve…
When Feedback Fails: The Scaling and Saturation of Star Formation Efficiency
Michael Y. Grudić, Philip F. Hopkins, Claude-André Faucher-Giguère +3
We present a suite of 3D multi-physics MHD simulations following star formation in isolated turbulent molecular gas disks ranging from 5 to 500 parsecs in radius. These simulations…
A search for long-timescale, low-frequency radio transients
Tara Murphy, David L. Kaplan, Steve Croft +30
We present a search for transient and highly variable sources at low radio frequencies (150-200 MHz) that explores long timescales of 1-3 years. We conducted this search by compari…