159 citations · 696 across the 21 of their papers we have counts for
22 papers
Ammonia Fitting of Multiple Velocity Components in High-Mass Star-Forming Regions
T. Withers, S. Sadavoy, M. Chen +19
We perform a multiple velocity component analysis of ammonia (NH) gas from KEYSTONE, a Green Bank Telescope survey covering 11 giant molecular clouds (GMCs) at distances from 0…
The JCMT Gould Belt Survey Complete Core Catalogue: Core mass function variations between nearby molecular clouds
Kate Pattle, James Di Francesco, Jenny Hatchell +14
We present a catalogue of dense cores identified in James Clerk Maxwell Telescope (JCMT) Gould Belt Survey SCUBA-2 observations of nearby star-forming clouds. We identified 2257 de…
Evaluating Neighbor Explainability for Graph Neural Networks
Oscar Llorente, Rana Fawzy, Jared Keown +6
Explainability in Graph Neural Networks (GNNs) is a new field growing in the last few years. In this publication we address the problem of determining how important is each neighbo…
A Survey of Deuterated Ammonia in the Cepheus Star-Forming Region L1251
Maria Galloway-Sprietsma, Yancy L. Shirley, James Di Francesco +4
Understanding the chemical processes during starless core and prestellar core evolution is an important step in understanding the initial stages of star and disk formation. This pr…
Are massive dense clumps truly sub-virial? A new analysis using Gould Belt ammonia data
Ayushi Singh, Christopher D. Matzner, Rachel K. Friesen +21
Dynamical studies of dense structures within molecular clouds often conclude that the most massive clumps contain too little kinetic energy for virial equilibrium, unless they are…
Herschel Gould Belt Survey Observations of Dense Cores in the Cepheus Flare Clouds
James Di Francesco, Jared Keown, Cassandra Fallscheer +17
We present Herschel SPIRE and PACS maps of the Cepheus Flare clouds L1157, L1172, L1228, L1241, and L1251, observed by the Herschel Gould Belt Survey (HGBS) of nearby star-forming…
Relative Alignment between Dense Molecular Cores and Ambient Magnetic Field: The Synergy of Numerical Models and Observations
Che-Yu Chen, Erica A. Behrens, Jasmin E. Washington +26
The role played by magnetic field during star formation is an important topic in astrophysics. We investigate the correlation between the orientation of star-forming cores (as defi…
Velocity-coherent Filaments in NGC 1333: Evidence for Accretion Flow?
Michael Chun-Yuan Chen, James Di Francesco, Erik Rosolowsky +11
Recent observations of global velocity gradients across and along molecular filaments have been interpreted as signs of gas accreting onto and along these filaments, potentially fe…
CLOVER: Convnet Line-fitting Of Velocities in Emission-line Regions
Jared Keown, James Di Francesco, Hossen Teimoorinia +2
When multiple star-forming gas structures overlap along the line-of-sight and emit optically thin emission at significantly different radial velocities, the emission can become non…
KFPA Examinations of Young STellar Object Natal Environments (KEYSTONE): Hierarchical Ammonia Structures in Galactic Giant Molecular Clouds
Jared Keown, James Di Francesco, Erik Rosolowsky +23
We present initial results from the K-band focal plane array Examinations of Young STellar Object Natal Environments (KEYSTONE) survey, a large project on the 100-m Green Bank Tele…
The Green Bank Ammonia Survey: A Virial Analysis of Gould Belt Clouds in Data Release 1
Ronan Kerr, Helen Kirk, James Di Francesco +14
We perform a virial analysis of starless dense cores in three nearby star-forming regions : L1688 in Ophiuchus, NGC 1333 in Perseus, and B18 in Taurus. Our analysis takes advantage…
Science with an ngVLA: Star-forming Filaments and Cores on a Galactic Scale
James Di Francesco, Jared Keown, Rachel Friesen +2
Continuum observations of molecular clouds have revealed a surprising amount of substructure in the form of filaments of a few pc length and cores of ~0.1 pc diameter. Understandin…
Droplets I: Pressure-Dominated Sub-0.1 pc Coherent Structures in L1688 and B18
Hope How-Huan Chen, Jaime E. Pineda, Alyssa A. Goodman +22
We present the observation and analysis of newly discovered coherent structures in the L1688 region of Ophiuchus and the B18 region of Taurus. Using data from the Green Bank Ammoni…
The discrimination between star-forming and AGN galaxies in the absence of Hα and [NII]: A machine learning approach
Hossen Teimoorinia, Jared Keown
In the absence of the two emission lines H and [NII] (6584Å) in a BPT diagram, we show that other spectral information is sufficiently informative to distinguish AGN galaxies fr…
The Green Bank Ammonia Survey: Unveiling the Dynamics of the Barnard 59 star-forming Clump
E. Redaelli, F. O. Alves, P. Caselli +17
Understanding the early stages of star formation is a research field of ongoing development, both theoretically and observationally. In this context, molecular data have been conti…
The Green Bank Ammonia Survey: Observations of Hierarchical Dense Gas Structures in Cepheus-L1251
Jared Keown, James Di Francesco, Helen Kirk +20
We use Green Bank Ammonia Survey observations of NH (1,1) and (2,2) emission with 32'' FWHM resolution from a ~ 10 pc portion of the Cepheus-L1251 molecular cloud to iden…
The Green Bank Ammonia Survey: Dense Cores Under Pressure in Orion A
Helen Kirk, Rachel K. Friesen, Jaime E. Pineda +21
We use gas temperature and velocity dispersion data from the Green Bank Ammonia Survey and core masses and sizes from the James Clerk Maxwell Telescope Gould Belt Survey to estimat…
The Green Bank Ammonia Survey (GAS): First Results of NH3 mapping the Gould Belt
Rachel K. Friesen, Jaime E. Pineda, Erik Rosolowsky +21
We present an overview of the first data release (DR1) and first-look science from the Green Bank Ammonia Survey (GAS). GAS is a Large Program at the Green Bank Telescope to map al…
Infall/Expansion Velocities in the Low-Mass Dense Cores L492, L694-2, and L1521F: Dependence on Position and Molecular Tracer
Jared Keown, Scott Schnee, Tyler L Bourke +6
Although surveys of infall motions in dense cores have been carried out for years, few surveys have focused on mapping infall across cores using multiple spectral line observations…
The JCMT Gould Belt Survey: First results from SCUBA-2 observations of the Cepheus Flare Region
Kate Pattle, Derek Ward-Thompson, Jason M. Kirk +57
We present observations of the Cepheus Flare obtained as part of the James Clerk Maxwell Telescope (JCMT) Gould Belt Legacy Survey (GBLS) with the SCUBA-2 instrument. We produce a…
GRACES observations of young [alpha/Fe]-rich stars
David Yong, Luca Casagrande, Kim A. Venn +10
We measure chemical abundance ratios and radial velocities in four massive (i.e., young) [alpha/Fe]-rich red giant stars using high-resolution high-S/N spectra from ESPaDOnS fed by…
Radio Properties of Young Stellar Objects in the Core of the Serpens South Infrared Dark Cloud
Nicholas Kern, Jared Keown, John Tobin +2
We present deep radio continuum observations of the star-forming core of the Serpens South Infrared Dark Cloud with the Karl G. Jansky Very Large Array (VLA). Observations were con…