6D Stellar Streams in the Southern Sky Nora Shipp | University of - - PowerPoint PPT Presentation

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6d stellar streams in the southern sky
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6D Stellar Streams in the Southern Sky Nora Shipp | University of - - PowerPoint PPT Presentation

Mar 03, 2024 232 likes •439 views

6D Stellar Streams in the Southern Sky Nora Shipp | University of Chicago with Ting Li, Denis Erkal, Alex Drlica-Wagner, Andrew Pace, Brian Yanny, Vasily Belokurov, S 5 Collaboration 2 new papers on the arXiv last week Proper Motions of Stellar

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6D Stellar Streams in the Southern Sky

Nora Shipp | University of Chicago

with Ting Li, Denis Erkal, Alex Drlica-Wagner, Andrew Pace, Brian Yanny, Vasily Belokurov, S5 Collaboration

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2 new papers on the arXiv last week

Proper Motions of Stellar Streams Discovered in the Dark Energy Survey Shipp et al. 2019 arXiv:1907.09488 The Southern Stellar Stream Spectroscopic Survey (S5): Overview, Target Selection, Data Reduction, Validation, and Early Science Li et al. 2019 arXiv:1907.09481

Nora Shipp | UChicago

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Stellar streams in the Dark Energy Survey

Shipp et al. 2018 arXiv:1801.03097

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Nora Shipp | UChicago

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Stellar streams in the Dark Energy Survey

Shipp et al. 2018 arXiv:1801.03097

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Nora Shipp | UChicago

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S5 - Southern Stellar Stream Spectroscopic Survey

s5collab.github.io

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  • Using 3.9-m Anglo-Australian Telescope’s

2-degree-Field fibre positioner and AAOmega spectrograph

  • Efficient target selection with DES DR1

photometry and Gaia DR2 proper motions

  • Completed observations of 12 streams (9 DES)

Leadership: Ting Li, Daniel Zucker, Geraint Lewis, Kyler Kuehn Builders: Denis Erkal, Alex Ji, Sergey Koposov, Dougal Mackey, Nora Shipp, Jeffrey Simpson, Zhen Wan Members: Joss Bland-Hawthorn, Jeremy Mould, Sahar Allam, Eduardo Balbinot, Keith Bechtol, Vasily Belokurov, Andrew Casey, Lara Cullinane, Gary Da Costa, Gayandhi De Silva, Alex Drlica-Wagner, Marla Geha, Yao-Yuan Mao, Sarah Martell, Andrew Pace, Sanjib Sharma, Josh Simon, Douglas Tucker, Kathy Vivas, Risa Wechsler, Brian Yanny

Nora Shipp | UChicago

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Proper motions with DES DR1 X Gaia DR2

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Nora Shipp | UChicago

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Proper motions with DES DR1 X Gaia DR2

Data cuts

  • Color-magnitude
  • Color-color (metal-poor)
  • Parallax
  • Spatial
  • Astrometric fit quality
  • Star-galaxy

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Nora Shipp | UChicago

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Proper motions with DES DR1 X Gaia DR2

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Nora Shipp | UChicago

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Proper motions with DES DR1 X Gaia DR2

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Nora Shipp | UChicago

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Effect of the LMC

Proper Motion Stream Track

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Nora Shipp | UChicago

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Effect of the LMC

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I n c r e a s i n g L M C e f f e c t

Nora Shipp | UChicago Tucana III Sagittarius Orphan Pal 5 GD-1 Tri Psc

This work Previous measurements

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Effect of the LMC

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With LMC (M = 1.5 x 1011 M☉)

Red: Data Blue: Model

Nora Shipp | UChicago

(Motivated by Erkal et al., 2019 fit to the Orphan stream) Stream Track Distance Radial Velocity Proper Motion (RA) Proper Motion (Dec) ATLAS

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Effect of the LMC

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Without LMC

Red: Data Blue: Model

Nora Shipp | UChicago

Stream Track Distance Radial Velocity Proper Motion (RA) Proper Motion (Dec) ATLAS

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Effect of the LMC

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ATLAS - Data Chenab - Data Phoenix - Data

Nora Shipp | UChicago

For a stream on an unperturbed orbit:

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Effect of the LMC

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ATLAS - Data ATLAS - Model Chenab - Data Chenab - Model Phoenix - Data Phoenix - Model

With LMC (M = 1.5 x 1011 M☉) Nora Shipp | UChicago

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Effect of the LMC

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Effect of the LMC

With LMC (M = 1.5 x 1011 M☉)

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ATLAS - Data ATLAS - Model Chenab - Data Chenab - Model Phoenix - Data Phoenix - Model

Nora Shipp | UChicago

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Weird Streams: Jhelum

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Nora Shipp | UChicago

Bonaca et al. 2019: 2 spatial components

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Weird Streams: Jhelum

Nora Shipp | UChicago

Bonaca et al. 2019: 2 spatial components Shipp et al. 2019: 2 kinematic components

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Summary

  • Combining photometric, astrometric, and spectroscopic observations of stellar streams

will allow us to take full advantage of these powerful probes of the MW matter distribution.

  • DES, Gaia, S5 datasets together provide 6D+1 measurements of southern streams.
  • Southern streams can be used to constrain the mass distribution of the LMC. Many of the
  • bserved stream perturbations are consistent with previous LMC mass measurements.
  • Stay tuned for upcoming S5 papers on individual streams and population statistics!

Proper motion measurements: arXiv:1907.09488 S5 overview: arXiv:1907.09481

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Nora Shipp | UChicago