399 citations · 3.3k across the 65 of their papers we have counts for
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Timescales for Low-Mass Star Formation in Extragalactic Environments: Implications for the Stellar IMF
Manda Banerji, Serena Viti, David A. Williams +1
We investigate the physical and chemical conditions necessary for low-mass star formation in extragalactic environments by calculating various characteristic timescales associated…
Tracing high density gas in M 82 and NGC 4038
E. Bayet, C. Lintott, S. Viti +4
We present the first detection of CS in the Antennae galaxies towards the NGC 4038 nucleus, as well as the first detections of two high-J (5-4 and 7-6) CS lines in the center of M…
Molecular line profiles as diagnostics of protostellar collapse: modelling the `blue asymmetry' in inside-out infall
Y. G. Tsamis, J. M. C. Rawlings, J. A. Yates +1
The evolution of star-forming core analogues undergoing inside-out collapse is studied with a multi-point chemodynamical model which self-consistently computes the abundance distri…
Molecular tracers of high mass star-formation in external galaxies
E. Bayet, S. Viti, D. A. Williams +1
Hot core molecules should be detectable in external active galaxies out to high redshift. We present here a detailed study of the chemistry of star-forming regions under physical c…
CO abundances in a protostellar cloud: freeze-out and desorption in the envelope and outflow of L483
P. B. Carolan, M. P. Redman, E. Keto +1
CO isotopes are able to probe the different components in protostellar clouds. These components, core, envelope and outflow have distinct physical conditions and sometimes more tha…
Desorption From Interstellar Ices
J. F. Roberts, J. M. C. Rawlings, S. Viti +1
The desorption of molecular species from ice mantles back into the gas phase in molecular clouds results from a variety of very poorly understood processes. We have investigated th…
The James Clerk Maxwell Telescope Legacy Survey of Nearby Star-forming Regions in the Gould Belt
D. Ward-Thompson, J. Di Francesco, J. Hatchell +59
This paper describes a James Clerk Maxwell Telescope (JCMT) legacy survey that has been awarded roughly 500 hrs of observing time to be carried out from 2007 to 2009. In this surve…
The JCMT Spectral Legacy Survey
R. Plume, G. A. Fuller, F. Helmich +30
Stars form in the densest, coldest, most quiescent regions of molecular clouds. Molecules provide the only probes which can reveal the dynamics, physics, chemistry and evolution of…
Dense and diffuse gas in dynamically active clouds
R. T. Garrod, D. A. Williams, J. M. C. Rawlings
We investigate the chemical and observational implications of repetitive transient dense core formation in molecular clouds. We allow a transient density fluctuation to form and di…
Oscillations in the stable starless core Barnard 68
M. P. Redman, E. Keto, J. M. C. Rawlings
New molecular line observations of the Bok globule Barnard 68 in HCO+ irrefutably confirm the complex pattern of red and blue asymmetric line profiles seen across the face of the c…
Determining the cosmic ray ionization rate in dynamically evolving clouds
C. J. Lintott, J. M. C. Rawlings
The ionization fraction is an important factor in determining the chemical and physical evolution of star forming regions. In the dense, dark starless cores of such objects, the io…
Molecular Clouds as Ensembles of Transient Cores
R. T. Garrod, D. A. Williams, J. M. C. Rawlings
We construct models of molecular clouds that are considered as ensembles of transient cores. Each core is assumed to develop in the background gas of the cloud, grow to high densit…
Modeling the Physical Structure of the Low Density Pre-protostellar Core Lynds 1498
Yancy L. Shirley, Miranda K. Nordhaus, Jana M. Grcevich +3
Lynds 1498 is a pre-protostellar core (PPC) and was one of the initial objects toward which molecular depletion and differentiation was detected. Despite the considerable scrutiny…
Hot Cores : Probes of High-Redshift Galaxies
C. J. Lintott, S. Viti, D. A. Williams +2
The very high rates of second generation star formation detected and inferred in high redshift objects should be accompanied by intense millimetre-wave emission from hot core molec…
B335: A Laboratory for Astrochemistry in a Collapsing Cloud
Neal J. Evans, Jeong-Eun Lee, Jonathan M. C. Rawlings +1
We present observations of 25 transitions of 17 isotopologues of 9 molecules toward B335. With a goal of constraining chemical models of collapsing clouds, we compare our observati…
Molecular abundance ratios as a tracer of accelerated collapse in regions of high mass star formation?
C. J. Lintott, S. Viti, J. M. C. Rawlings +5
Recent observations suggest that the behaviour of tracer species such as N_2H+ and CS is significantly different in regions of high and low mass star formation. In the latter, N_2H…
Rotation of the pre-stellar core L1689B
M. P. Redman, E. Keto, J. M. C. Rawlings +1
The search for the onset of star formation in pre-stellar cores has focussed on the identification of an infall signature in the molecular line profiles of tracer species. The clas…
The Sensitivity of Infall Molecular Line Profiles to the Ambient Radiation Field
M. P. Redman, J. M. C. Rawlings, J. A. Yates +1
In cold molecular clouds submillimetre emission lines are excited by the ambient radiation field. The pumping is dominated by the cosmic microwave background (CMB). It is usual in…
The HCO+ emission excess in bipolar outflows
J. M. C Rawlings, M. P. Redman, E. Keto +1
A plausible model is proposed for the enhancement of the abundance of molecular species in bipolar outflow sources. In this model, levels of HCO+ enhancement are considered based o…
Molecular gas freeze-out in the pre-stellar core L1689B
M. P. Redman, J. M. C. Rawlings, D. J. Nutter +2
C17O (J=2-1) observations have been carried out towards the pre-stellar core L1689B. By comparing the relative strengths of the hyperfine components of this line, the emission is s…
Tracing the Mass during Low-Mass Star Formation, IV: Observations and Modeling of the Submillimeter Continuum Emission from Class I Protostars
C. H. Young, Y. L. Shirley, N. J. Evans +1
We present results from the observations and modeling of seventeen Class I cores with the Submillimetre Common Users Bolometer Array (SCUBA) on the James Clerk Maxwell Telescope (J…
Tracing the Mass during Low-Mass Star Formation. III. Models of the Submillimeter Dust Continuum Emission from Class 0 Protostars
Yancy L. Shirley, Neal J. Evans, Jonathan M. C. Rawlings
Seven Class 0 sources mapped with SCUBA at 850 and 450 micron are modeled using a one dimensional radiative transfer code. The modeling takes into account heating from an internal…
Tracing the Mass during Low-Mass Star Formation. II. Modelling the Submillimeter Emission from Pre-Protostellar Cores
Neal J. Evans, Jonathan M. C. Rawlings, Yancy L. Shirley +1
We have modeled the emission from dust in pre-protostellar cores, including a self-consistent calculation of the temperature distribution for each input density distribution. Model…
Tracing the Mass during Low-Mass Star Formation. I. Submillimeter Continuum Observations
Yancy L. Shirley, Neal J. Evans, Jonathan M. C. Rawlings +1
We have obtained 850 and 450 micron continuum maps of 21 low mass cores with SED's ranging from pre-protostellar to Class I (18K < Tbol < 370K), using SCUBA at the JCMT. In this pa…