Searching for the Bottom of the Initial Mass Function

Details Searching for the Bottom of the Initial Mass Function Searching for the Bottom of the Initial Mass Function

Jul 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004hst..prop10138l&link_type=abstract

HST Proposal ID #10138

Physics

Hst Proposal Id #10138 Stellar Populations

Scientific paper

The minimum mass of the Initial Mass Function {IMF} should be a direct reflection of the physical processes that dominate in the formation of stars and brown dwarfs. To date, the IMF has been measured down to 10 M_Jup in a few young clusters; there is no sign of a low-mass cutoff in the data for these clusters. We propose to obtain deep images in the SDSS i and z filters {i=26, z=25} with the ACS/WFC on HST for a 800"x1000" field in the Chamaeleon I star-forming region {2 Myr, 160 pc}. By combining these HST data {0.8, 0.9 um} with comparably deep broad-band photometry from ground-based telescopes {1.2, 1.6, 2.2 um} and SIRTF {3.6, 4.5, 5.8, 8.0 um}, we will measure the mass function of brown dwarfs down to the mass of Jupiter and thus determine the lowest mass at which objects can form in isolation in a typical star forming cluster.

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