Searching for Stellar Streams in the Solar Neighbourhood

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Searching for Stellar Streams in the Solar
Neighbourhood

• Rainer Klement (MPIA)
• Hans-Walter Rix (MPIA), Burkhard Fuchs (ARI)

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1. Introduction

• Phase-space distribution of stars has structure
  on small scales ? moving groups/ stellar streams
• Young moving groups (stars remeber their
  birthplace)
• Dynamical streams (e.g. bar resonance)
• Tidal streams (signs of hierarchical Galaxy build
  up)
• Basic idea stars in the same tidal stream have
  very similar Integrals of motion
  (E,L,LZ,e) f (x,v, F(x))
• Large samples of stars with (a ,d ,d, vrad, µa,
  µd) needed RAVE, SDSS/SEGUE

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2. Stream detection in RAVE data

• Distribution in V vs. (U2 2V2)1/2
• 
  
• 
  1st application
• 
  RAVE DR1
• 
  7015 stars
• 
  dlt500pc, sd/dlt0.25

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2. Stream detection in RAVE data

• Distribution in V vs. (U2 2V2)1/2
• 
  
• 
  smooth velocity
• 
  distribution sub-
• 
  tracted

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3. Stream detection in SDSS data

• Distribution in V vs. (U2 2V2)1/2
• 
  
• 
  
• 
  SEGUE data
• 
  8066 stars
• 
  dlt1kpc, sd/dlt0.25

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Business card

• PhD student, supervisor H.W. Rix
• Projects
• i) Streams in the Solar neighbourhood (SDSS
  project 298)
• ii) Local gravitational potential,
  Schwarzschilds method (H.W. Rix, B. Fuchs, C.
  Flynn)
• Using IDL, C/C, SQL