NOAO >   Observing Info >   Approved Programs >   2006A-0295

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Proposal Information for 2006A-0295


PI: Nathan Smith, University of Colorado, nathans@casa.colorado.edu
Address: Center for Astrophysics and Space Astronomy, 389 UCB, Boulder, CO 80309, USA

Title: Ground-based Imaging and Spectroscopy for Spitzer and HST Surveys of the Carina Nebula

Abstract: Two large area surveys of the Carina Nebula have recently been undertaken - Spitzer has imaged the most active regions of triggered star formation where molecular clouds are being pounded by UV radiation and stellar winds from some of the most massive stars in the Galaxy, and HST has imaged the entire inner region of the nebula in H(alpha). These surveys have revealed an incredibly rich collection of star formation phenomena, but ground-based observations are needed to correctly interpret these data. Wide-field near-IR imaging with ISPI is needed to construct 1-8 (micron) spectral energy distributions (in combination with Spitzer data) and thereby classify embedded protostars. In many cases, 2MASS data lack the required sensitivity. The sub- arcsecond spatial resolution typically attainable at CTIO will be important in crowded embedded clusters. Narrowband images will also identify embedded portions of stellar outflows, to connect embedded sources with more extended portions of the jet that are seen in visual wavelength emission lines after they escape the cloud core. HST images in H(alpha) have revealed many candidate jets from embedded sources, but images alone are not enough. Optical spectra with RC Spec are needed to confirm the jet nature of these sources, in order to measure their outflow speeds, electron densities, and mass-loss rates.


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NOAO >   Observing Info >   Approved Programs >   2006A-0295

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