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GEMS: The Evolution of Disc Galaxies

GEMS: The Evolution of Disc Galaxies. Marco Barden. Galaxy Evolution. Archaeology  Look-back approach Galaxy evolution  Population evolution Important because: Even in local universe 60-80% discs Most of all stars form in discs Most of the stars of the MW formed since z~1

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GEMS: The Evolution of Disc Galaxies

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  1. GEMS: The Evolution of Disc Galaxies Marco Barden Ringberg Workshop: Secular Evolution of Disc Galaxies

  2. Galaxy Evolution • Archaeology  Look-back approach • Galaxy evolution  Population evolution • Important because: • Even in local universe 60-80% discs • Most of all stars form in discs • Most of the stars of the MW formed since z~1  measure structural parameters of discs as a function of time Ringberg Workshop: Secular Evolution of Disc Galaxies

  3. Theoretical Models • Expectation from models (e.g. Mo, Mao, White 1998, Bouwens & Silk 2002): Discs in the early universe • were more compact • were on average brighter • had higher surface brightness • had lower stellar masses than disc galaxies today  large redshift surveys to constrain models Ringberg Workshop: Secular Evolution of Disc Galaxies

  4. Observations • Several surveys (e.g. CFRS, DEEP, GOODS) controversy • Strong SB evolution (result of higher overall SFR, Schade et al. 1996) • No evolution in SB (selection effects, Simard et al. 1999) • At z~1 a new class of high SB galaxies (0,e<17.7 mag arcsec-2) appears (Simard et al. 1999) Ravindranath et al. 2004 Ringberg Workshop: Secular Evolution of Disc Galaxies

  5. Observations • Restricted luminosity range interpretation • Surface brightness dimming  selection effects dominate a high-z • Objects are small  high spatial resolution needed • Distribution of surface brightness is wide  large samples Ringberg Workshop: Secular Evolution of Disc Galaxies

  6. GEMS: Galaxy Evolution from Morphology and SEDs MPIA:Barden, Bell, Borch, Häußler, Heymans, Meisenheimer, Rix (P.I.) STScI:Beckwith, Caldwell, Jogee, Somerville AIP:Jahnke, Sanchez, Wisotzki Oxford:Wolf UMass:McIntosh U. Arizona:Peng Ringberg Workshop: Secular Evolution of Disc Galaxies

  7. GEMS: Galaxy Evolution from Morphology and SEDs • E-CDFS • Largest HST colour mosaic: ~30’x30’, 9x9 ACS tiles, ~150 HDF • 125 (GEMS) + 50 (GOODS) orbits • 2 filters: • F606W (mAB<28.3) • F850LP (mAB<27.1) Ringberg Workshop: Secular Evolution of Disc Galaxies

  8. z=1.25 z=0.69 z=0.46 z=0.24 GEMS: Galaxy Evolution from Morphology and SEDs • ~10000 redshifts from COMBO-17 (Wolf, Meisen-heimer et al. 2003) • 5 broad / 12 medium band filters • z~0.02, 0.1<z<1.3, mr<24 • SEDs (3500-9250Å) Ringberg Workshop: Secular Evolution of Disc Galaxies

  9. The Disc Sample • Sersic fits to F850LP images with GALFIT (Peng et al. 2002) • Selection of discs with n<2.5 • Completeness  simulations (Häußler et al. 2004) • Size correction (de Jong 1996) Ringberg Workshop: Secular Evolution of Disc Galaxies

  10. Completeness & Selection Effects Ringberg Workshop: Secular Evolution of Disc Galaxies

  11. The Magnitude-Size Relation Ringberg Workshop: Secular Evolution of Disc Galaxies

  12. V(z)=(20.790.08) - (1.050.11) z The Magnitude-Size Relation Ringberg Workshop: Secular Evolution of Disc Galaxies

  13. V(z)=(20.790.08) - (1.050.11) z The Magnitude-Size Relation Trujillo et al. 2004 HDF FIRES Ringberg Workshop: Secular Evolution of Disc Galaxies

  14. The Magnitude-Size Relation V(z)=(21.240.08) - (1.790.11) z Ringberg Workshop: Secular Evolution of Disc Galaxies

  15. The Magnitude-Size Relation Bouwens & Silk 2002 Ringberg Workshop: Secular Evolution of Disc Galaxies

  16. The Mass-Size Relation Ringberg Workshop: Secular Evolution of Disc Galaxies

  17. log (z) = 8.240.02 The Mass-Size Relation Ringberg Workshop: Secular Evolution of Disc Galaxies

  18. The Mass-Size Relation Ringberg Workshop: Secular Evolution of Disc Galaxies

  19. Conclusions • The magnitude-size relation of disc galaxies changes as a function of redshift  average SB increases • The appearance of high SB galaxies at high-z is a result of the increasing average SB • Disc galaxies at different redshifts follow the same mass-size relation  galaxies form inside-out • Mass densities stay roughly constant with redshift Ringberg Workshop: Secular Evolution of Disc Galaxies

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