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

Published online by Cambridge University Press:  09 May 2016

Judith Cohen ,
Branimir Sesar ,
Sophianna Banholzer  and
the PTF Collaboration
Judith Cohen
Affiliation:
California Institute of Technology, Palomar Observatory, Mail Code 249-17, Pasadena, Ca., 91125, USA email: jlc@astro.caltech.edu
Branimir Sesar
Affiliation:
California Institute of Technology, Palomar Observatory, Mail Code 249-17, Pasadena, Ca., 91125, USA email: jlc@astro.caltech.edu Max Planck Institute for Astronomy, Konigstühl 17, D-69117, Heidelberg, Germany email: bsesar@mpia.de
Sophianna Banholzer
Affiliation:
California Institute of Technology, Palomar Observatory, Mail Code 249-17, Pasadena, Ca., 91125, USA email: jlc@astro.caltech.edu
the PTF Collaboration
Affiliation:
California Institute of Technology, Palomar Observatory, Mail Code 249-17, Pasadena, Ca., 91125, USA email: jlc@astro.caltech.edu
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Abstract

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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. vr and σ(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±1.5×1011M⊙ is derived from our data.

Keywords

The GalaxyGalaxy: halostars: variables: RR Lyrae

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