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The Outer Galactic Halo As Probed By RR Lyr Stars From the Palomar Transient Facility + Keck

We present initial results from our study of the outer halo of the Milky Way using a large sample of RR Lyr(ab) variables datamined from the archives of the Palomar Transient Facility. Of the 464 RR Lyr in our sample with distances exceeding 50 kpc, 62 have been observed spectroscopically at the Keck Observatory. Radial velocities and sigma(vr) are given as a function of distance between 50 and 110 kpc, and a very preliminary rather low total mass for the Milky Way out to 110 kpc of ~7 (+-1.5) x 10**11 solar masses is derived from our data.

preprint2015arXivOpen access
Judith G. CohenBranimir SesarSophianna Banholzerthe PTF Consortium
astro-ph.GA
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Judith G. CohenBranimir SesarSophianna Banholzerthe PTF Consortium

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