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Research School of Astronomy and Astrophysics. Australian National University. Progress Report on the 6dF Galaxy Survey. Heath Jones. Observations and Sky Coverage. Redshifts and Redshift Completeness. Results and Planned Data Releases. Campbell, Saunders & Colless, (in prep).
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Research School of Astronomy and Astrophysics Australian National University Progress Report on the 6dF Galaxy Survey Heath Jones • Observations and Sky Coverage • Redshifts and Redshift Completeness • Results and Planned Data Releases
Campbell, Saunders & Colless, (in prep) • 1564 fields assigned across the southern sky • 172000 galaxies Tiling the Sample
Number Covered by Tiles Number of Sources on Sky Tiling the Sample Campbell, Saunders & Colless, (in prep) • 12 samples with tiling completeness 94% or better • 9 samples with tiling completeness 96% or better
The Observing/Reducing Cycle • Preparation, observing, reducing follows the lunar cycle
The Observing/Reducing Cycle • Preparation, observing, reducing follows the lunar cycle • Redshifting takes place in the following lunation
The Observing/Reducing Cycle • Preparation, observing, reducing follows the lunar cycle • Redshifting takes place in the following lunation • Survey results are updated/reported ~6 weeks after observation
Observing Progress • ~650 fieldshave been observed, (as of mid-June) Target is ~1500.
Observing Progress • ~650 fieldshave been observed, (as of mid-June) Target is ~1500.
Observing Progress • ~650 fieldshave been observed, (as of mid-June) Target is ~1500. • Similar observing pattern to 2dF survey
547 fields 595 fields 422 fields Progress on the Sky • ~1500 field centres assigned across the southern sky • Observing strategy sees sky tackled in thirds…
Progress on the Sky • ~1500 field centres assigned across the southern sky • Observing strategy sees sky tackled in thirds… • ~650 observed, (as of mid-June 2003)
Progress on the Sky • ~1500 field centres assigned across the southern sky • Observing strategy sees sky tackled in thirds… • ~650 observed, (as of mid-June 2003) • ~415 redshifted from 2002-2003 data, (up to mid-May 2003)
40% coverage down to 4% BOTH 6DF AND LITERATURE REDSHIFTS Redshift Progress On Individual Samples
2. Successful Redshifts Success Rates (Per Field) 1. Sources through fibres:
34400 galaxies 1300 stars (3%) 450 ISM (1%) 4700 failed (11%) Results from the 6dF Observations • ~65500 objects observed, (as of mid-June) • ~41,000 redshifted
450 ISM (1%) 1300 stars (3%) 4700 failed (11%) 34400 galaxies 80% of fields > than 80% complete 90% of fields > than 70% Number of Galaxy Redshifts Number of Galaxy Redshifts + Redshift Failures PER FIELD Results from the 6dF Observations • ~65500 objects observed, (as of mid-June) • ~41,000 redshifted
450 ISM (1%) 1300 stars (3%) 4700 failed (11%) 34400 galaxies Results from the 6dF Observations • ~65500 objects observed, (as of mid-June) • ~41,000 redshifted
Number of Galaxy Redshifts Per Unit Area Number of Galaxy Redshifts + Failures Per Unit Area Galaxy Redshift Completeness - K-band Survey showing 0 to 100%
Number of Galaxy Redshifts Per Unit Area Number of Galaxy Redshifts + Failures Per Unit Area Galaxy Redshift Completeness - K-band Survey showing 50 to 100% MEDIAN ~ 60 % • Only the K-band Survey • Completeness calculated from the 412 redshifted fields, plus literature redshifts • High areal sky coverage does not necessarily imply high redshift completeness
STRIP A Progress in Each Strip • There are 1564 fields on the sky: – 651 (42%) have been observed, – 913 (58%) remain. (as of June 2003) • Coverage by strip:
STRIP A STRIP B Progress in Each Strip • There are 1564 fields on the sky: – 651 (42%) have been observed, – 913 (58%) remain. (as of June 2003) • Coverage by strip:
STRIP A STRIP B STRIP C Progress in Each Strip • There are 1564 fields on the sky: – 651 (42%) have been observed, – 913 (58%) remain. (as of June 2003) • Coverage by strip:
6dF Galaxy Survey Database http://www-wfau.roe.ac.uk/6dFGS/ Data Releases • Initial release of ~13000 galaxies in December 2002 • Next data release planned for the end 2003/start 2004
Further Information • 6dF Galaxy Survey Home Page – http://www.mso.anu.edu.au/6dFGS/ • 6dFGS Progress Page – http://www.mso.anu.edu.au/6dFGS/Team/Progress_Page/ • 6dFGS Online Database – http://www-wfau.roe.ac.uk/6dFGS/
STRIP A STRIP B STRIP C Fields Observed and Those Remaining
40% coverage down to 4% BOTH 6DF AND LITERATURE REDSHIFTS Redshift Progress On Individual Samples