Publications (18)
Mid-Infrared Extinction Mapping of Infrared Dark Clouds II. The Structure of Massive Starless Cores and Clumps
Michael J. Butler, Jonathan C. Tan
(abridged) We develop the mid-infrared extinction (MIREX) mapping technique of Butler & Tan (2009, Paper I), presenting a new method to correct for the Galactic foreground emission…
A Hunt for Massive Starless Cores
Shuo Kong, Jonathan C. Tan, Paola Caselli +3
We carry out an ALMA (3-2) and 1.3~mm continuum survey towards 32 high mass surface density regions in seven Infrared Dark Clouds with the aim of finding massive starle…
The Distribution of Mass Surface Densities in a High-Mass Protocluster
Wanggi Lim, Jonathan C. Tan, Jouni Kainulainen +2
We study the probability distribution function (PDF) of mass surface densities, , of infrared dark cloud (IRDC) G028.37+00.07 and its surrounding giant molecular cloud. This PD…
Kiloparsec-Scale Simulations of Star Formation in Disk Galaxies. I. The unmagnetized and zero-feedback limit
Sven Van Loo, Michael J. Butler, Jonathan C. Tan
We present hydrodynamic simulations of the evolution of self-gravitating dense gas on scales of 1 kiloparsec down to < parsec in a galactic disk, designed to study dense clump form…
Kiloparsec-Scale Simulations of Star Formation in Disk Galaxies. IV. Regulation of Galactic Star Formation Rates by Stellar Feedback
Michael J. Butler, Jonathan C. Tan, Romain Teyssier +3
Star formation from the interstellar medium of galactic disks is a basic process controlling the evolution of galaxies. Understanding the star formation rate in a local patch of a…
Zooming in to Massive Star Birth
Shuo Kong, Jonathan C. Tan, Paola Caselli +3
We present high resolution (0.2", 1000 AU) 1.3 mm ALMA observations of massive infrared dark cloud clump, G028.37+00.07-C1, thought to harbor the early stages of massive star forma…
Mapping Large-Scale CO Depletion in a Filamentary Infrared Dark Cloud
Audra K. Hernandez, Jonathan C. Tan, Paola Caselli +4
Infrared Dark Clouds (IRDCs) are cold, high mass surface density and high density structures, likely to be representative of the initial conditions for massive star and star cluste…
The AGORA high-resolution galaxy simulations comparison project: Public data release
Santi Roca-FÃ brega, Ji-hoon Kim, Joel R. Primack +11
As part of the AGORA High-resolution Galaxy Simulations Comparison Project (Kim et al. 2014, 2016) we have generated a suite of isolated Milky Way-mass galaxy simulations using 9 s…
The Darkest Shadows: Deep Mid-Infrared Extinction Mapping of a Massive Protocluster
Michael J. Butler, Jonathan C. Tan, Jouni Kainulainen
We use deep Spitzer-IRAC imaging of a massive Infrared Dark Cloud (IRDC) G028.37+00.07 to construct a Mid-Infrared (MIR) extinction map that probes mass surface densities…
Kiloparsec-Scale Simulations of Star Formation in Disk Galaxies III. Structure and Dynamics of Filaments and Clumps in Giant Molecular Clouds
Michael J. Butler, Jonathan C. Tan, Sven Van Loo
We present hydrodynamic simulations of self-gravitating dense gas in a galactic disk, exploring scales ranging from 1 kpc down to ~pc. Our primary goal is to understand h…
Kiloparsec-Scale Simulations of Magnetised Molecular Clouds in Disk Galaxies
Sven Van Loo, Michael J. Butler, Jonathan C. Tan +1
We present simulations of the evolution of self-gravitating dense gas on kiloparsec-size scales in a galactic disk, designed to study dense clump formation from giant molecular clo…
The AGORA High-Resolution Galaxy Simulations Comparison Project. II: Isolated Disk Test
Ji-hoon Kim, Oscar Agertz, Romain Teyssier +40
Using an isolated Milky Way-mass galaxy simulation, we compare results from 9 state-of-the-art gravito-hydrodynamics codes widely used in the numerical community. We utilize the in…
Core Emergence in a Massive Infrared Dark Cloud: A Comparison Between Mid-IR Extinction and 1.3 mm Emission
Shuo Kong, Jonathan C. Tan, Héctor G. Arce +3
Stars are born from dense cores in molecular clouds. Observationally, it is crucial to capture the formation of cores in order to understand the necessary conditions and rate of th…
The Deuterium Fraction in Massive Starless Cores and Dynamical Implications
Shuo Kong, Jonathan C. Tan, Paola Caselli +6
We study deuterium fractionation in two massive starless/early-stage cores C1-N and C1-S in Infrared Dark Cloud (IRDC) G028.37+00.07, first identified by Tan et al. (2013) with ALM…
A Virialized Filamentary Infrared Dark Cloud
Audra K. Hernandez, Jonathan C. Tan, Jouni Kainulainen +4
The initial conditions of massive star and star cluster formation are expected to be cold, dense and high column density regions of the interstellar medium, which can reveal themse…
An Ordered Bipolar Outflow from a Massive Early-Stage Core
Jonathan C. Tan, Shuo Kong, Yichen Zhang +3
We present ALMA follow-up observations of two massive, early-stage core candidates, C1-N & C1-S, in Infrared Dark Cloud (IRDC) G028.37+00.07, which were previously identified by th…
The Dynamics of Massive Starless Cores with ALMA
Jonathan C. Tan, Shuo Kong, Michael J. Butler +2
How do stars that are more massive than the Sun form, and thus how is the stellar initial mass function (IMF) established? Such intermediate- and high-mass stars may be born from r…
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…