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 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008hst..prop11695l&link_type=abstract

HST Proposal ID #11695. Cycle 17

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Scientific paper

The measurement of the minimum mass of the IMF would provide a fundamental test of theories of star and planet formation. In a Cycle 13 program, we used ACS and ground-based near-IR imaging and spectroscopy to measure the IMF down to a completeness limit of 10 M_Jup {i 24} in a 800"x1000" area in the southern subcluster of the Chamaeleon I star-forming region {2 Myr, 160 pc}. There is no sign of a low-mass cutoff in this IMF measurement. To provide a better constraint on the minimum mass of the IMF, we propose to obtain ACS images of this field again and use the two ACS epochs to identify substellar cluster members down to the detection limit of the data {i 27} via their proper motions. In this way, we will improve the completeness limit of our IMF measurement to 3 M_Jup. In addition, to improve the number statistics of our measurement of the substellar IMF in Chamaeleon I, we propose to double the number of objects in the IMF sample by performing ACS imaging of a second field toward the northern subcluster.;

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