Constraining the Formation and Mass of the Milky Way Halo using Globular Cluster Orbits from HST Proper Motions

S. Tony Sohn; Roeland P. Van Der Marel; Alis Deason; Andrea Bellini; Gurtina Besla; Laura Watkins

doi:10.1017/S1743921317008018

Constraining the Formation and Mass of the Milky Way Halo using Globular Cluster Orbits from HST Proper Motions

S. Tony Sohn, Roeland P. Van Der Marel, Alis Deason, Andrea Bellini, Gurtina Besla, Laura Watkins

Astronomy

Research output: Contribution to journal › Article › peer-review

Abstract

The globular cluster (GC) system of the Milky Way (MW) provides important information on the MW's present structure and past evolution. Full 3d motions, accessed through proper motions (PMs), are required to calculate accurate orbits of GCs in the MW halo. We present our HST program to create a PM database for 20 halo GCs. We demonstrate how the observed PMs of individual GCs can be used to study their origins, and we also describe how the PM measurements of our entire targets can be used to constrain the anisotropy profile. Finally, we describe how our PM results can be used for Gaia as an external check, and discuss prospects of PM measurements with HST and Gaia in the coming years.

Original language	English (US)
Pages (from-to)	47-50
Number of pages	4
Journal	Proceedings of the International Astronomical Union
Volume	13
Issue number	S334
DOIs	https://doi.org/10.1017/S1743921317008018
State	Published - 2017

Keywords

Galaxy: globular clusters: general
Galaxy: halo
astrometry

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.1017/S1743921317008018

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@article{f2765538e8a649b4b7a2f1a2ab6e9872,

title = "Constraining the Formation and Mass of the Milky Way Halo using Globular Cluster Orbits from HST Proper Motions",

abstract = "The globular cluster (GC) system of the Milky Way (MW) provides important information on the MW's present structure and past evolution. Full 3d motions, accessed through proper motions (PMs), are required to calculate accurate orbits of GCs in the MW halo. We present our HST program to create a PM database for 20 halo GCs. We demonstrate how the observed PMs of individual GCs can be used to study their origins, and we also describe how the PM measurements of our entire targets can be used to constrain the anisotropy profile. Finally, we describe how our PM results can be used for Gaia as an external check, and discuss prospects of PM measurements with HST and Gaia in the coming years.",

keywords = "Galaxy: globular clusters: general, Galaxy: halo, astrometry",

author = "Sohn, {S. Tony} and {Van Der Marel}, {Roeland P.} and Alis Deason and Andrea Bellini and Gurtina Besla and Laura Watkins",

note = "Funding Information: Support for this work was provided by NASA through grants GO-14235 from the Space Telescope Science Institute (STScI), which is operated by the Association of Universities for Research in Astronomy (AURA), Inc., under NASA contract NAS5-26555. Publisher Copyright: {\textcopyright} International Astronomical Union 2018.",

year = "2017",

doi = "10.1017/S1743921317008018",

language = "English (US)",

volume = "13",

pages = "47--50",

journal = "Proceedings of the International Astronomical Union",

issn = "1743-9213",

publisher = "Cambridge University Press",

number = "S334",

}

TY - JOUR

T1 - Constraining the Formation and Mass of the Milky Way Halo using Globular Cluster Orbits from HST Proper Motions

AU - Sohn, S. Tony

AU - Van Der Marel, Roeland P.

AU - Deason, Alis

AU - Bellini, Andrea

AU - Besla, Gurtina

AU - Watkins, Laura

N1 - Funding Information: Support for this work was provided by NASA through grants GO-14235 from the Space Telescope Science Institute (STScI), which is operated by the Association of Universities for Research in Astronomy (AURA), Inc., under NASA contract NAS5-26555. Publisher Copyright: © International Astronomical Union 2018.

PY - 2017

Y1 - 2017

N2 - The globular cluster (GC) system of the Milky Way (MW) provides important information on the MW's present structure and past evolution. Full 3d motions, accessed through proper motions (PMs), are required to calculate accurate orbits of GCs in the MW halo. We present our HST program to create a PM database for 20 halo GCs. We demonstrate how the observed PMs of individual GCs can be used to study their origins, and we also describe how the PM measurements of our entire targets can be used to constrain the anisotropy profile. Finally, we describe how our PM results can be used for Gaia as an external check, and discuss prospects of PM measurements with HST and Gaia in the coming years.

AB - The globular cluster (GC) system of the Milky Way (MW) provides important information on the MW's present structure and past evolution. Full 3d motions, accessed through proper motions (PMs), are required to calculate accurate orbits of GCs in the MW halo. We present our HST program to create a PM database for 20 halo GCs. We demonstrate how the observed PMs of individual GCs can be used to study their origins, and we also describe how the PM measurements of our entire targets can be used to constrain the anisotropy profile. Finally, we describe how our PM results can be used for Gaia as an external check, and discuss prospects of PM measurements with HST and Gaia in the coming years.

KW - Galaxy: globular clusters: general

KW - Galaxy: halo

KW - astrometry

UR - http://www.scopus.com/inward/record.url?scp=85060106002&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85060106002&partnerID=8YFLogxK

U2 - 10.1017/S1743921317008018

DO - 10.1017/S1743921317008018

M3 - Article

SN - 1743-9213

VL - 13

SP - 47

EP - 50

JO - Proceedings of the International Astronomical Union

JF - Proceedings of the International Astronomical Union

IS - S334

ER -

Constraining the Formation and Mass of the Milky Way Halo using Globular Cluster Orbits from HST Proper Motions

Abstract

Keywords

ASJC Scopus subject areas

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