NOAO >   Observing Info >   Approved Programs >   2015A-0080

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Program Information for 2015A-0080


PI: Johanna C Coronado, Pontificia Universidad Catolica de Chile, jccorona@uc.cl
Address: Instituto de Astrofisica, Av. Vicuna Mackenna 4860, Macul, Santiago, Chile, Santiago, Santiago 7820436 Chile

CoI: Julio Chaname, Pontificia Universidad Catolica de Chile

Title: Assembling the Largest, Most Distant Sample of Genuine Halo Wide Binaries for Galactic Structure and Dynamics.

Abstract: Samples of wide binaries (a $\gtrsim$ 100 AU) are a gold mine for Galactic studies. They have been used on a large list of applications in a diversity of fields. In the dynamical arena, wide binaries provided the first meaningful constraints on the mass and nature of disk dark matter and, more recently, were used to all but close the remaining parameter space of MACHO-like halo dark matter not accessible to the microlensing campaigns. All these applications were possible when samples of these objects became large enough to not be dominated by random, chance alignments of two unrelated stars projected on the sky. Nevertheless, still today the largest available sample of the particularly valuable halo wide binaries contains not much more than 100 systems. Here we propose to use COSMOS to assemble a new, much larger sample of genuine halo wide binaries that will probe regions of the Galactic halo not reached before with such dynamically sensitive test particles.

Program Type: Standard/Galactic

Scheduled Nights:
Run 1 (2015A):  KP-4m/KOSMOS -- 1n on Feb 26 - Feb 27 2015
Run 2 (2015A):  KP-4m/KOSMOS -- 2n on May 19 - May 20 2015


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NOAO >   Observing Info >   Approved Programs >   2015A-0080

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