NOAO >   Observing Info >   Approved Programs >   2004B-0486

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Proposal Information for 2004B-0486


PI: Tracy L. Huard, Harvard-Smithsonian Center for Astrophysics, thuard@cfa.harvard.edu
Address: Radio & Geoastronomy, 60 Garden Street, M.S. 42, Cambridge, MA 02138, USA

CoI: Philip C. Myers, Harvard-Smithsonian Center for Astrophysics
CoI: Lionel J. Crews, University of Tennessee at Martin
CoI: David C. Murphy, Carnegie Institute of Washington

Title: Infrared Reddening Law: Characterizing the dust grain populations and density profiles of cores

Abstract: We propose to observe a set of isolated, dense molecular cloud cores at H and K with FLAMINGOS to supplement our Spitzer IRAC mid-infrared observations of these cores. By obtaining these H and K observations to a comparable depth as the IRAC observations, we will be able to construct the first infrared reddening law for dense environments applicable for a large range of column densities. The proposed observations will be sufficient to determine whether this infrared reddening law changes from core to core as well as whether it changes within a core from the densest regions to the more diffuse surrounding regions of the molecular cloud. We will then use the observed reddening law to discriminate between and constrain models of dust grain populations within dense cores. It is possible that such observations could detect the first clear and direct evidence for differentiation in the dust grain population within molecular clouds. The same observations will be used to study the extinction structure of the target cores. Our target cores have been selected to include cores exhibiting a wide range of characteristics: starless, collapsing, isolated star formation, cluster star formation. We will also use these observations to construct high-resolution maps of the column densities through these cores to discriminate between a number of different initial conditions for the collapse of a core.


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