The IMF in NGC6611: the environmental influence on the formation of low-mass stars and brown dwarfs

Details The IMF in NGC6611: the environmental influence on the formation of low-mass stars and brown dwarfs The IMF in NGC6611: the environmental influence on the formation of low-mass stars and brown dwarfs

Jul 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005hst..prop10533o&link_type=abstract

HST Proposal ID #10533

Physics

Hst Proposal Id #10533 Star Formation

Scientific paper

We propose to use HST with ACS and NICMOS to survey the central area of the young {2 Myr} cluster NGC6611 in the Eagle Nebula, with the goal of constructing the low-mass and substellar Initial Mass Function {IMF}. We plan to obtain deep images in I {F775W} and Z {F850LP} with ACS/WFC, and deep images in J {F110W} and H {F160W} for 25 NICMOS/NIC2 fields within the 202" x 202" ACS/WFC field. Using a proven technique based on the use of IZJH color-magnitude and color-color diagrams to identify and determine the masses of the low-mass pre-main sequence cluster members, we are thus able to construct the IMF down to masses of 0.02-0.03 Msun. With an intense ionizing radiation field but a relatively low density, NGC6611 provides a unique laboratory in which to test the importance of photoevaporation and density on the formation of low-mass stars and brown dwarfs, through comparison with the IMFs determined for the different environments in the Orion Nebular Cluster, Taurus and IC348. This will not only offer substantial new insight into the physics of star formation, but also have important ramifications for estimating the global star formation rates at high redshift, the efficiency of galactic chemical evolution and the contribution of sub-stellar mass objects to the baryonic dark matter content of the Universe.

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