Nearby young moving groups IMF

We parameterized these IMFs using a log-normal distribution for m<1M_{sun}_ and a power-law for m>1M_{sun}_. We detected 4166 source candidate members of 44 known groups, including 2545 new candidates. We recovered 44-54 percent of the literature candidates and estimated a contamination rate from old field stars of 16-24 percent.

The candidates of the detected groups distribute along young isochrones, suggesting that they are potential members of NYMGs. Parameterizations of both the average of the 33 IMFs based on our detections (mc=0.25+/-0.17M_{sun}_, sigmac=0.45+/-0.17, and alpha=-2.26+/-0.09) and the one based on the known candidates from the literature (mc=0.22+/-0.14M_{sun}_, sigmac=0.45+/-0.17, and alpha=-2.45+/-0.06) are in agreement with the IMF parameterization of the solar neighbourhood and young stellar associations.

Our parameterization of the average IMF, together with the distribution of the detected group members along young isochrones, provides strong evidence suggesting that the NYMGs are remnants of individual stellar associations and clusters, and that there are no systematic biases in our detection and in the literature in the mass range 0.1<m/M_{sun}_<10.