Now showing items 1-20 of 55

• #### The ADS All-Sky Survey ﻿

(Astronomical Society of the Pacific, 2012)
The ADS All-Sky Survey (ADSASS) is an ongoing effort aimed at turning the NASA Astrophysics Data System (ADS), widely known for its unrivaled value as a literature resource for astronomers, into a data resource. The ADS ...
• #### Alignment between Protostellar Outflows and Filamentary Structure ﻿

(American Astronomical Society, 2017)
We present new Submillimeter Array (SMA) observations of CO(2-1) outflows toward young, embedded protostars in the Perseus molecular cloud as part of the Mass Assembly of Stellar Systems and their Evolution with the SMA ...
• #### Anchoring Magnetic Fields in Turbulent Molecular Clouds ﻿

(American Astronomical Society, 2009)
One of the key problems in star formation research is to determine the role of magnetic fields. Starting from the atomic intercloud medium which has density $n_H \sim \ 1 \ cm^{–3}$, gas must accumulate from a volume ...
• #### The Angular Momentum of Magnetized Molecular Cloud Cores: A Two-Dimensional-Three-Dimensional Comparison ﻿

(Institute of Physics Publishing, Inc., 2010)
In this work, we present a detailed study of the rotational properties of magnetized and self-gravitating dense molecular cloud cores formed in a set of two very high resolution three-dimensional molecular cloud simulations ...
• #### The Bones of the Milky Way ﻿

(American Astronomical Society, 2013)
The very long, thin infrared dark cloud "Nessie" is even longer than had been previously claimed, and an analysis of its Galactic location suggests that it lies directly in the Milky Way’s mid-plane, tracing out a highly ...
• #### Building A Three Dimensional Universe From The Classroom: Multiperspective Visualization For Non-science Undergraduates ﻿

(2016)
We develop three-dimensional mental models of our physical environs from two dimensional imagery we collect with our eyes. This is possible only because we move through that environment, viewing it from multiple perspectives, ...
• #### The Complete Survey of Outflows in Perseus ﻿

(American Astronomical Society, 2010)
We present a study on the impact of molecular outflows in the Perseus molecular cloud complex using the COMPLETE Survey large-scale $^{12}CO(1-0)$ and $^{13}CO(1-0)$ maps. We used three-dimensional isosurface models ...
• #### Dense Cores in Perseus: The Influence of Stellar Content and Cluster Environment ﻿

(American Astronomical Society, 2009)
We present the chemistry, temperature, and dynamical state of a sample of 193 dense cores or core candidates in the Perseus Molecular cloud and compare the properties of cores associated with young stars and clusters with ...
• #### Determining the Absorption towards Classical T Tauri Stars from Hydrogen Emission Lines ﻿

(Protostars and Planets VI, 2013)
Classical T Tauri stars (CTTS) are low-mass pre-main sequence objects surrounded by an accretion disk and still partially embedded in the parent circumstellar cloud. We observed a sample of 20 CTTS covering different ages ...
• #### Direct Observation of a Sharp Transition to Coherence in Dense Cores ﻿

(American Astronomical Society, 2010)
We present $NH_3$ observations of the B5 region in Perseus obtained with the Green Bank Telescope. The map covers a region large enough $(\sim 11'×14')$ that it contains the entire dense core observed in previous dust ...
• #### The Dust Emissivity Spectral Index in the Starless Core TMC-1C ﻿

(American Astronomical Society, 2009)
In this paper, we present a dust emission map of the starless core TMC-1C taken at $2100 \mu m$. Along with maps at 160, 450, 850, and 1200 μm, we study the dust emissivity spectral index from the (sub)millimeter spectral ...
• #### Dust Spectral Energy Distributions in the Era of Herschel and Planck: A Hierarchical Bayesian-Fitting Technique ﻿

(American Astronomical Society, 2012)
We present a hierarchical Bayesian method for fitting infrared spectral energy distributions (SEDs) of dust emission to observed fluxes. Under the standard assumption of optically thin single temperature (T) sources, the ...
• #### The Dynamics of Dense Cores in the Perseus Molecular Cloud II: the Relationship between Dense Cores and the Cloud ﻿

(Institute of Physics Publishing, Inc., 2010)
We utilize the extensive datasets available for the Perseus molecular cloud to analyze the relationship between the kinematics of small-scale dense cores and the larger structures in which they are embedded. The kinematic ...
• #### The Effect of Line-of-Sight Temperature Variation and Noise on Dust Continuum Observations ﻿

(American Astronomical Society, 2009)
We investigate the effect of line-of-sight temperature variations and noise on two commonly used methods to determine dust properties from dust-continuum observations of dense cores. One method employs a direct fit to a ...
• #### The Effect of Noise on the Dust Temperature-Spectral Index Correlation ﻿

(American Astronomical Society, 2009)
We investigate how uncertainties in flux measurements affect the results from modified blackbody spectral energy distribution (SED) fits. We show that an inverse correlation between the dust temperature T and spectral index ...
• #### The Effect of Projection on Derived Mass-Size and Linewidth-Size Relationships ﻿

(American Astronomical Society, 2010)
Power-law mass-size and linewidth-size correlations, two of "Larson's laws," are often studied to assess the dynamical state of clumps within molecular clouds. Using the result of a hydrodynamic simulation of a molecular ...
• #### Evidence for Grain Growth in Molecular Clouds: A Bayesian Examination of the Extinction Law in Perseus ﻿

(Royal Astronomical Society, 2013)
We investigate the shape of the extinction law in two $1^{\circ}$ square fields of the Perseus molecular cloud complex. We combine deep red-optical (r, i and z band) observations obtained using Megacam on the MMT with ...
• #### First stars of the ρ Ophiuchi dark cloud ﻿

(EDP Sciences, 2016)
Star formation in molecular clouds can be triggered by the dynamical action of winds from massive stars. Furthermore, X-ray and UV fluxes from massive stars can influence the life time of surrounding circumstellar disks. ...
• #### Galactic supernova remnant candidates discovered by THOR ﻿

(EDP Sciences, 2017)
Context. There is a considerable deficiency in the number of known supernova remnants (SNRs) in the Galaxy compared to that expected. This deficiency is thought to be caused by a lack of sensitive radio continuum data. ...
• #### The Green Bank Ammonia Survey: Dense Cores under Pressure in Orion A ﻿

(American Astronomical Society, 2017)
We use data on gas temperature and velocity dispersion from the Green Bank Ammonia Survey and core masses and sizes from the James Clerk Maxwell Telescope Gould Belt Survey to estimate the virial states of dense cores ...