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Mid-Infrared Extinction Mapping of Infrared Dark Clouds: Probing the Initial Conditions for Massive Stars and Star Clusters
Michael J. Butler, Jonathan C. Tan
(Abridged) We use 8 micron Spitzer GLIMPSE images to make extinction maps of 10 IRDCs, selected to be relatively nearby and massive. The extinction mapping technique requires model…
Star Formation in Disk Galaxies. I. Formation and Evolution of Giant Molecular Clouds via Gravitational Instability and Cloud Collisions
Elizabeth J. Tasker, Jonathan C. Tan
We investigate the formation and evolution of giant molecular clouds (GMCs) in a Milky-Way-like disk galaxy with a flat rotation curve. We perform a series of 3D adaptive mesh refi…
A 42.3-43.6 GHz spectral survey of Orion BN/KL: First detection of the v=0 J=1-0 line from the isotopologues 29SiO and 30SiO
C. Goddi, L. J. Greenhill, E. M. L. Humphreys +3
We have surveyed molecular line emission from Orion BN/KL from 42.3 to 43.6 GHz with the Green Bank Telescope. Sixty-seven lines were identified and ascribed to 13 different molecu…
Population III.1 stars: formation, feedback and evolution of the IMF
Jonathan C. Tan
I discuss current theoretical expectations of how primordial, Pop III.1 stars form. Lack of direct observational constraints makes this a challenging task. In particular predicting…
Astrometry of the Dynamical Ejection of the Becklin-Neugebauer Object from theta^1 Ori C
Jonathan C. Tan
We show that the proper motion of the Becklin-Neugebauer (BN) object is consistent with its dynamical ejection from the theta^1 Ori C binary, contrary to recent claims by Gomez et…
Dark Matter Annihilation and Primordial Star Formation
Aravind Natarajan, Jonathan C. Tan, Brian W. O'Shea
We investigate the effects of weakly-interacting massive particle (WIMP) dark matter annihilation on the formation of Population III.1 stars, which are theorized to form from the c…