Spectroscopic Confirmation of the Ongoing Assembly of Giant Ellipticals

Details Spectroscopic Confirmation of the Ongoing Assembly of Giant Ellipticals Spectroscopic Confirmation of the Ongoing Assembly of Giant Ellipticals

Feb 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011noao.prop..117m&link_type=abstract

NOAO Proposal ID #2011A-0117

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Scientific paper

Major gas-poor (so-called 'dry') mergers are postulated to be a central mechanism in explaining the assembly of the giant ellipticals found at the tip of the galaxy mass function (M_*>10^11 M_&sun;). Yet, late epoch mergers are rare and their signatures are fleeting, and only with SDSS could we recently establish a sample of nearby systems that appear caught in the act of merging two massive red galaxies. Unfortunately, 70% of these mergers have no spectrum for one of the interacting galaxies, which severely limits further analysis of this important population. Here we propose 3760-6240Aspectroscopy of 13 merger progenitors using the GoldCam Spectrometer on the 2.1- meter. These observations will supplement similar observations for 12 additional galaxies scheduled for Dec. 2010, complete this unique sample of local massive dry mergers, and provide improved statistics on their relative recessional velocity differences and dynamical mass ratios.

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