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Probing dark matter halos of galaxies through dwarf galaxies

Probing dark matter halos of galaxies through dwarf galaxies. Irina Yegorova (ESO, Chile). In collaboration with…. Alessandro Pizzella ( Università di Padova , Italy) Paolo Salucci (SISSA, Trieste, Italy). How can we trace the kinematics?. radio observations planetary nebulae

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Probing dark matter halos of galaxies through dwarf galaxies

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  1. Probing dark matter halos of galaxies through dwarf galaxies Irina Yegorova (ESO, Chile) Nearby Dwarf Galaxies 14 - 18 September 2009, SAO, Russia

  2. In collaboration with…. • Alessandro Pizzella (Università di Padova, Italy) • Paolo Salucci (SISSA, Trieste, Italy) Nearby Dwarf Galaxies 14 - 18 September 2009, SAO, Russia

  3. Nearby Dwarf Galaxies 14 - 18 September 2009, SAO, Russia

  4. Nearby Dwarf Galaxies 14 - 18 September 2009, SAO, Russia

  5. How can we trace the kinematics? • radio observations • planetary nebulae • globular clusters dwarf galaxies Nearby Dwarf Galaxies 14 - 18 September 2009, SAO, Russia

  6. Probing dark matter halos of galaxies with their satellites 1.5 - 2 satellites per host galaxy • Zaritsky (1993): 45primaries– 69satellites • Kitt Peak 2.3 m • Sales & Lambas (2004): 1498 primaries – 3079satellites • 2dFGRS 3.9 m • T. Breinerd(2004) 3 samples: 1351primaries – 2084satellites, • 948 primaries – 1294satellites, • 400primaries – 658 satellites • SDSS 2.5 m Nearby Dwarf Galaxies 14 - 18 September 2009, SAO, Russia

  7. Less primaries  bigger telescope  more satellites Nearby Dwarf Galaxies 14 - 18 September 2009, SAO, Russia

  8. Selection criteria • isolated • late type spirals • already known have at least • 4 satellites Nearby Dwarf Galaxies 14 - 18 September 2009, SAO, Russia

  9. The Sloan Digital Sky Survey Catalogue: Brainerd (2005) Nearby Dwarf Galaxies 14 - 18 September 2009, SAO, Russia

  10. SDSS J154040.56-000933.5 z=0.078 Nearby Dwarf Galaxies 14 - 18 September 2009, SAO, Russia

  11. We are studying 7 isolated spiral galaxies @ z = 0.03 - 0.09 + VIMOS EMMI Satellites+ Rotation curves Nearby Dwarf Galaxies 14 - 18 September 2009, SAO, Russia

  12. Nearby Dwarf Galaxies 14 - 18 September 2009, SAO, Russia

  13. Nearby Dwarf Galaxies 14 - 18 September 2009, SAO, Russia

  14. Nearby Dwarf Galaxies 14 - 18 September 2009, SAO, Russia

  15. Candidates for satellites: • Found within r < 1000 kpc • ∆V < 500 km/s Nearby Dwarf Galaxies 14 - 18 September 2009, SAO, Russia

  16. Primary galaxy z N of sat. (SDSS)‏ N of sat. (SDSS+new)‏ SDSSJ134215.02 0.029 4 8 SDSSJ145211.01 0.046 4 7 SDSSJ152621.67 0.083 4 17 SDSSJ153221.6 0.085 5 19 SDSSJ154040.5 0.075 7 11 SDSSJ154904.29 0.077 2 8 SDSSJ221957.2 0.038 4 7 7 primaries 77 satellites identified Nearby Dwarf Galaxies 14 - 18 September 2009, SAO, Russia

  17. How are satellites distributed? Nearby Dwarf Galaxies 14 - 18 September 2009, SAO, Russia

  18. Zaritsky (1997) minor axis (Holmberg effect) Agustsson & Brainerd rp > 300 kpc (2007) minor axis Brainerd (2005) major axis Sales & Lambas (2004) isotropic Bailin et al. (2008) distribution Nearby Dwarf Galaxies 14 - 18 September 2009, SAO, Russia

  19. SDSS J145211.01+044053.6 Nearby Dwarf Galaxies 14 - 18 September 2009, SAO, Russia

  20. Nearby Dwarf Galaxies 14 - 18 September 2009, SAO, Russia

  21. Nearby Dwarf Galaxies 14 - 18 September 2009, SAO, Russia

  22. How extended is the DM halo of the primaries? Nearby Dwarf Galaxies 14 - 18 September 2009, SAO, Russia

  23. SDSS J145211.01+044053.6 Nearby Dwarf Galaxies 14 - 18 September 2009, SAO, Russia

  24. 500 kpc Salucci et al. (2007)‏ Nearby Dwarf Galaxies 14 - 18 September 2009, SAO, Russia

  25. Conclusions: • With VIMOS (VLT) we have doubled (tripled) • the number of known satellites from SDSS • The satellite distribution around late-type • spirals is isotropic • The dark matter halo of late-type spirals is • extended till 500 kpc Nearby Dwarf Galaxies 14 - 18 September 2009, SAO, Russia

  26. Nearby Dwarf Galaxies 14 - 18 September 2009, SAO, Russia

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