Astronomy and Astrophysics – Astronomy
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21832102p&link_type=abstract
American Astronomical Society, AAS Meeting #218, #321.02; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
With the initial public release of GPIPS data for 400 fields, a wide range of new scientific studies is made possible. This talk will highlight some examples, so as to motivate broad use of this rich data set. Combining the GPIPS/PHOTCAT data products with 2MASS and UKIDSS will enable studies for NIR stellar variability and proper motion, as well as help resolve 2MASS source ambiguities and improve cluster photometry. The GPIPS/POLCAT polarization data catalogs enables mapping magnetic fields across a wide range of extinction, from Av = 1 to 20 mag or more, permitting tracing the field from the edges of molecular clouds to close to the most extincted cloud cores. In addition to assessing the roles played by the magnetic field in helping to order cool clouds and the star formation conditions within them through evaluating the mean field directions, POLCAT data may be analyzed with the Chandrasekhar-Fermi method to develop resolved magnetic field strength maps across fields. Also, comparisons of structure functions of cool cloud velocities and column densities may be compared to magnetic field structure functions to ascertain the relative importance of magnetohydrodynamic vs pure hydrodynamic turbulence. Finally, comparisons of the magnetic properties in the hot ISM, traced through Faraday rotation and synchrotron radiation, may be compared to the field properties in the cool ISM, atomic and molecular clouds, over the same lines of sight to gain an understanding of the coupling of the field across these vastly different ISM components.
Supported by NSF grants AST 06-07500 and AST 09-07790.
Bartlett M.
Clemens Dan P.
Marchwinski Robert
Moreau Julie May
Pavel Michael D.
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