SearcharxivSearch

arXiv · 0707.0169

The James Clerk Maxwell Telescope Legacy Survey of Nearby Star-forming Regions in the Gould Belt

Abstract

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 survey we will map with SCUBA-2 (Submillimetre Common User Bolometer Array 2) almost all of the well-known low-mass and intermediate-mass star-forming regions within 0.5 kpc that are accessible from the JCMT. Most of these locations are associated with the Gould Belt. From these observations we will produce a flux-limited snapshot of star formation near the Sun, providing a legacy of images, as well as point-source and extended-source catalogues, over almost 700 square degrees of sky. The resulting images will yield the first catalogue of prestellar and protostellar sources selected by submillimetre continuum emission, and should increase the number of known sources by more than an order of magnitude. We will also obtain CO maps with the array receiver HARP (Heterodyne Array Receiver Programme), in three CO isotopologues, of a large typical sample of prestellar and protostellar sources. We will then map the brightest hundred sources with the SCUBA-2 polarimeter (POL-2), producing the first statistically significant set of polarization maps in the submillimetre. The images and source catalogues will be a powerful reference set for astronomers, providing a detailed legacy archive for future telescopes, including ALMA, Herschel and JWST.

Explore related subjects

Keep this discovery

BibTeXRIS

D. Ward-Thompson, J. Di Francesco, J. Hatchell, M. R. Hogerheijde, P. Bastien, S. Basu, I. Bonnell, J. Bowey, C. Brunt, J. Buckle, H. Butner, B. Cavanagh, A. Chrysostomou, E. Curtis, C. J. Davis, W. R. F. Dent, E. van Dishoeck, M. G. Edmunds, M. Fich, J. Fiege, L. Fissel, P. Friberg, R. Friesen, W. Frieswijk, G. A. Fuller, A. Gosling, S. Graves, J. S. Greaves, F. Helmich, R. E. Hills, W. S. Holland, M. Houde, R. Jayawardhana, D. Johnstone, G. Joncas, H. Kirk, J. M. Kirk, L. B. G. Knee, B. Matthews, H. Matthews, C. Matzner, G. H. Moriarty-Schieven, D. Naylor, D. Nutter, R. Padman, R. Plume, J. M. C. Rawlings, R. O. Redman, M. Reid, J. S. Richer, R. Shipman, R. J. Simpson, M. Spaans, D. Stamatellos, Y. Tsanis, S. Viti, B. Weferling, G. J. White, A. P. Whitworth, J. Wouterloot, J. Yates, M. Zhu. 2007-07-02. The James Clerk Maxwell Telescope Legacy Survey of Nearby Star-forming Regions in the Gould Belt. https://doi.org/10.1086/521277

Cite the original work for its findings. Save a collection to share your selection of sources.

KEEP EXPLORING

Related papers

Circumstellar water vapour in M-type AGB stars: Radiative transfer models, abundances and predictions for HIFI

Aims: By performing a detailed radiative transfer analysis, we determine fractional abundances of circumstellar H2O in the envelopes around six M-type asymptotic giant branch stars. The models are also used to predict H2O spectral line emission for the upcoming Herschel/HIFI mission. Methods: We use Infrared space observatory long wavelength spectrometer spectra to constrain the circumstellar fractional abundance distribution of ortho-H2O, using a non-local thermal equilibrium, and non-local, radiative transfer code based on the accelerated lambda iteration formalism. The mass-loss rates and kinetic temperature structures for the sample stars are determined through radiative transfer modelling of CO line emission based on the Monte-Carlo method. The density and temperature profiles of the circumstellar dust grains are determined through spectral energy distribution modelling using the publicly available code Dusty. Results: The determined ortho-H2O abundances lie between 1e-4 and 1.5e-3 relative to H2, with the exception of WX Psc, which has a much lower estimated ortho-H2O abundance of only 2e-6, possibly indicating H_2O adsorption onto dust grains or recent mass-loss-rate modulations. The estimated abundances are uncertain by, at best, a factor of a few. Conclusions: The high water abundance found for the majority of the sources suggests that either the `normal' chemical processes are very effective in producing H2O, or else non-local thermal equilibrium atmospheric chemistry, grain surface reactions, or a release of H_2O (e.g. from icy bodies like Kuiper belt objects) play a role. We provide predictions for ortho-H2O lines in the spectral window of Herschel/HIFI.

astro-ph

CMB Anisotropies and Inflation from Non-Standard Spinors

The apparent alignment of the cosmic microwave background multipoles on large scales challenges the standard cosmological model. Scalar field inflation is isotropic and cannot account for the observed alignment. We explore the imprints, a non-standard spinor driven inflation would leave on the cosmic microwave background anisotropies. We show it is natural to expect an anisotropic inflationary expansion of the Universe which has the effect of suppressing the low multipole amplitude of the primordial power spectrum, while at the same time to provide the usual inflationary features.

astro-ph