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Deep Surveys of the Radio Universe with SKA Pathfinders

HI in Galaxies at Redshifts 0.1 to 1.0: Current and Future Observations U sing Optical Redshifts for HI Coadding. Philip Lah. Deep Surveys of the Radio Universe with SKA Pathfinders.

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Deep Surveys of the Radio Universe with SKA Pathfinders

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  1. HI in Galaxies at Redshifts 0.1 to 1.0: Current and Future Observations Using Optical Redshifts for HI Coadding Philip Lah Deep Surveys of the Radio Universe with SKA Pathfinders

  2. Collaborators:Frank Briggs (ANU) Jayaram Chengalur (NCRA) Matthew Colless (AAO)Roberto De Propris (CTIO)Michael Pracy (ANU)

  3. Talk Outline Current Observations • HI in star forming galaxies at z=0.24 • HI in Abell 370, a galaxy cluster at z = 0.37 Future Observations • using ASKAP and WiggleZ • using MeerKAT and zCOSMOS

  4. Current Observations -HI coadding

  5. Giant Metrewave Radio Telescope

  6. Giant Metrewave Radio Telescope

  7. Anglo-Australian Telescope

  8. 2dF/AAOmega instrument multi-object, fibre fed spectrograph

  9. The Fujita galaxies H emission galaxies at z = 0.24

  10. DEC RA The Fujita Galaxies Subaru Field 24’ × 30’ narrow band imaging  Hα emission at z = 0.24 (Fujita et al. 2003, ApJL, 586, L115) 348 Fujita galaxies 121 redshifts using AAT GMRT ~48 hours on field

  11. Coadded HI Spectrum

  12. HI spectrum all Fujita galaxies neutral hydrogen gas measurement using 121 redshifts - weighted average MHI = (2.26 ± 0.90) ×109 M raw binned

  13. The Cosmic Hydrogen Gas Density

  14. The Cosmic Gas Density vs. Redshift my new point

  15. Cosmic Neutral Gas Density vs. Time my new point

  16. Abell 370a galaxy cluster at z = 0.37

  17. Abell 370 • large galaxy cluster at z = 0.37, of order same size of Coma similar cluster velocity dispersion and X-ray gas temperature • optical imaging ANU 40 inch telescope • spectroscopic follow-up with the AAT • GMRT ~34 hours on cluster

  18. Abell 370 galaxy cluster Abell 370 galaxy cluster 324 galaxies with redshifts z = 0.345 to 0.387 105 blue galaxies 219 red galaxies

  19. Abell 370 galaxy cluster Abell 370 galaxy cluster 3σ extent of X-ray gas R200 radius at which cluster 200 times denser than the general field

  20. The Measuring the HI signal

  21. Galaxy Sizes For HI stacking I want the galaxies to be unresolved. For the Fujita galaxies I used an estimate of the HI size from the optical properties using information on nearby spiral and irregular field galaxies. Complication! The Abell 370 galaxies are a mixture of early and late types in a variety of environments. Solution I made multiple measurements of the galaxies HI mass using different smoothing sizes.

  22. Galaxy Sizes For HI stacking I want the galaxies to be unresolved. For the Fujita galaxies I used an estimate of the HI size from the optical properties using information on nearby spiral and irregular field galaxies. Complication! The Abell 370 galaxies are a mixture of early and late types in a variety of environments. Solution I made multiple measurements of the galaxies HI mass using different smoothing sizes.

  23. Galaxy Sizes For HI stacking I want the galaxies to be unresolved. For the Fujita galaxies I used an estimate of the HI size from the optical properties using information on nearby spiral and irregular field galaxies. Complication! The Abell 370 galaxies are a mixture of early and late types in a variety of environments. Solution I made multiple measurements of the galaxies HI mass using different smoothing sizes.

  24. The Average HI Mass Measurements

  25. HI mass 324 galaxies 219 galaxies 105 galaxies 94 galaxies 156 galaxies 168 galaxies 104 galaxies 220 galaxies

  26. HI mass 324 galaxies 219 galaxies 105 galaxies 94 galaxies 156 galaxies 168 galaxies 104 galaxies 220 galaxies

  27. HI mass 324 galaxies 219 galaxies 105 galaxies 94 galaxies 156 galaxies 168 galaxies 104 galaxies 220 galaxies

  28. HI mass 324 galaxies 219 galaxies 105 galaxies 94 galaxies 156 galaxies 168 galaxies 104 galaxies 220 galaxies

  29. HI mass 324 galaxies 219 galaxies 105 galaxies 94 galaxies 156 galaxies 168 galaxies 104 galaxies 220 galaxies

  30. HI spectra – Large Smoothing MHI = (6.6 ± 3.5) ×109 M MHI = (23.0 ± 7.7) ×109 M

  31. HI Flux – All Galaxies 30 arcsec across ~150 kpc across

  32. HI Flux – The Blue Galaxies Outside X-ray Gas 30 arcsec across ~150 kpc across

  33. Future Observations -HI coadding

  34. What I could do with the SKA pathfinders if you gave them to me TODAY.

  35. ASKAP and MeerKAT parameters

  36. ASKAP and MeerKAT parameters

  37. ASKAP and MeerKAT parameters z = 0.4 to 1.0 in a single observation z = 0.2 to 1.0 in a single observation

  38. WiggleZ and zCOSMOS

  39. WiggleZ and zCOSMOS

  40. WiggleZ and zCOSMOS

  41. WiggleZ and zCOSMOS

  42. WiggleZ and zCOSMOS

  43. WiggleZ and zCOSMOS

  44. WiggleZ and zCOSMOS

  45. WiggleZ and ASKAP

  46. WiggleZ field ~10 degrees across data as of March 2008 z = 0.1 to 1.0 ASKAP beam size Diameter 6.2 degrees Area 30 deg2

  47. ASKAP & WiggleZ 100hrs nz = 5975

  48. ASKAP & WiggleZ 100hrs nz = 5975

  49. ASKAP & WiggleZ 100hrs nz = 5975

  50. ASKAP & WiggleZ 1000hrs nz = 5975

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