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Deep Multi-Color Imaging in 47 Tuc: Some Early Results

Deep Multi-Color Imaging in 47 Tuc: Some Early Results. Halo. Bulge. Disk. 47 Tuc. Magellanic Clouds. 2MASS ALL SKY IMAGE. H. Richer (UBC). Hubble’s 25th Anniversary!!. Cycle 1. Deep Multi-Color Imaging in 47 Tuc: Some Early Results. Halo. Bulge. Disk. 47 Tuc. Magellanic Clouds.

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Deep Multi-Color Imaging in 47 Tuc: Some Early Results

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  1. Deep Multi-Color Imaging in 47 Tuc: Some Early Results Halo Bulge Disk 47 Tuc Magellanic Clouds 2MASS ALL SKY IMAGE H. Richer (UBC)

  2. Hubble’s 25th Anniversary!! Cycle 1

  3. Deep Multi-Color Imaging in 47 Tuc: Some Early Results Halo Bulge Disk 47 Tuc Magellanic Clouds 2MASS ALL SKY IMAGE H. Richer (UBC)

  4. Collaborators • R. Goldsbury, H. Richer, K. Woodley - UBC • J. Anderson, J. Kalirai - STScI • B. Hansen, D. Reitzel, M. Rich - UCLA • A. Dotter - UVic • G. Fahlman, P. Stetson - HIA/NRC • J. Hurley - Swinburne • I. King - UW • M. Shara - AMNH

  5. WD Cooling Model and N6397 Note: Excellent fit through most cooling region At bright end real WDs too red or too bright - radii too large or minor colour transformation problems? At faint end real stars turn blue (CIA) faster than models See poster by Rich et al. Model from Bergeron (2008) Model from Bergeron (2008)

  6. Model Fit to Data • Age = 12.21 +/-0.35 Gyr • Includes opacity from red wing L (Kowalski 2006) • Systematic errors from different models not included Comparison N6397 and M4 Luminosity Functions Hansen et al 2007

  7. Galactic Disk is Younger than Halo • Dots = disk • Line = M4 (halo) • M4 LF fainter WDs • M4 older than disk • Disk age 7.5±1.0 Gyr

  8. 47 Tuc - an Important Template Disk/Bulge Template Template RGBs Nearby Galaxies Harris 2010 Brown et al. 2009

  9. GO 11677 on 47 Tuc (Cycle 17) Orbits 121 Field 6’ west of centre ACS F606W F814W Archival F475W F775W F850L WFC3 UVIS: F390W F606W IR: F160W F110W Science Age, binary, variables, planets, H-burning limit, brown dwarfs, motion & MF SMC

  10. Center ACS Images Full Field Edge

  11. ACS CMD WD Cooling Simulations

  12. WFC3 Images 47 Tuc F160W F110W

  13. 47 Tuc Near IR CMD TO TO Kink Kink (CIA) Width (real) Width - Real SMC SMC

  14. 47 Tuc Near IR CMD - Ages Age 2 ways Turnoff 11 Gyrs mag or color (Kink-TO) 11-12 Gyrs Models by A. Dotter

  15. Width Lower MS - real, easy to quantify as MS vertical · Models indicate light element variations (mainly O) · He can’t explain at fixed [Fe/H] 47 Tuc Near IR CMD

  16.     Cosmology and WD Cooling Ages Disk 47 Tuc--> N6397/M4 5 1 4 N6397/M4 SFR (M yr-1 Mpc-3) 3 Z  0.1 47 Tuc --> 2 Disk 1 0.01 0 2 4 6 14 6 8 10 12 Z T (Gyr) WMAP Model z vs age z and Cosmic Star Formation Thompson et al. 2006 Spergel et al. 2003

  17. Photometric Errors on theLower Main Sequence

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