Progress Report on the 6dF Galaxy Survey
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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). - PowerPoint PPT Presentation
Transcript of Progress Report on the 6dF Galaxy Survey
Progress Report on the 6dF Galaxy Survey
Heath Jones
Redshifts and Redshift Completeness
Results and Planned Data Releases
Observations and Sky Coverage
Research School of Astronomy and AstrophysicsAustralian National University
Tiling the Sample 172000 galaxies
1564 fields assigned across the southern sky
Campbell, Saunders & Colless, (in prep)
Tiling the Sample
12 samples with tiling completeness 94% or better
9 samples with tiling completeness 96% or better
Sample Priority Total Tiling Completeness
2MASS Ks < 12.75 8 113988 94.1 %
2MASS H < 13.05 6 3283 91.8
2MASS J < 13.75 6 2008 92.7
SuperCOSMOS rF < 15.7 6 9199 94.9
SuperCOSMOS bJ < 17.0 6 9749 93.8
Shapley 6 939 85.7
ROSAT All-Sky Survey 6 2913 91.7
HIPASS (> 4-sigma) 6 821 85.5
IRAF Faint Source Catalogue 6 10707 94.9
Denis J < 14 5 1505 93.2
Denis I < 15 5 2017 61.7
2MASS AGN 4 2132 91.7
Hamburg-ESO Survey 4 3539 90.6
NOAO-VLA Sky Survey 4 4334 87.6
Number of Sources on Sky
Number Covered by Tiles
Campbell, Saunders & Colless, (in prep)
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 fields have been observed, (as of mid-June)
Target is ~1500.
Observing Progress
~650 fields have been observed, (as of mid-June)
Target is ~1500.
Semester Fields Cumulate
01 A 26 26
01 B 89 115
02 A 193 308
02 B 222 530
03 A 121 651
Observing Progress
~650 fields have been observed, (as of mid-June)
Target is ~1500.
Semester Fields Cumulate
01 A 26 26
01 B 89 115
02 A 193 308
02 B 222 530
03 A 121 651
Similar observing pattern to 2dF survey
Progress on the Sky
547 fields
595 fields
422 fields
Observing strategy sees sky tackled in thirds…
~1500 field centres assigned across the southern sky
Progress on the Sky
~650 observed, (as of mid-June 2003)
~1500 field centres assigned across the southern sky
Observing strategy sees sky tackled in thirds…
Progress on the Sky
~415 redshifted from 2002-2003 data, (up to mid-May 2003)
~1500 field centres assigned across the southern sky
~650 observed, (as of mid-June 2003)
Observing strategy sees sky tackled in thirds…
Redshift Progress On Individual Samples Sample Sources Redshifts Coverage
2MASS Ks < 12.75 113988 43226 38 %
2MASS H < 13.05 3283 524 16
2MASS J < 13.75 2008 319 16
SuperCOSMOS rF < 15.7 9199 2690 30
SuperCOSMOS bJ < 17.0 9749 2446 25
Shapley 939 177 19
ROSAT All-Sky Survey 2913 448 15
HIPASS (> 4-sigma) 821 194 24
IRAF Faint Source Catalogue 10707 2341 22
Denis J < 14 1505 151 10
Denis I < 15 2017 179 9
2MASS AGN 2132 111 5
Hamburg-ESO Survey 3539 146 4
SUMSS 4475 544 12
Shanks et al. 466 62 13
NOAO-VLA Sky Survey 4334 224 5
40% coveragedown to 4%
BOTH 6DF AND LITERATURE REDSHIFTS
Success Rates (Per Field)
1. Sources through fibres: 2. Successful Redshifts
Relationship between Completeness and S/N
Results from the 6dF Observations
~65500 objects observed, (as of mid-June)
~41,000 redshifted
34400 galaxies1300 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
90% of fields > than 70%
80% of fields > than 80% complete
Number of Galaxy
RedshiftsNumber 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
Galaxy Redshift Completeness - K-band Survey
Number of Galaxy Redshifts Per
Unit AreaNumber of Galaxy Redshifts + Failures Per Unit Area
showing 0 to 100%
Galaxy Redshift Completeness - K-band Survey
Number of Galaxy Redshifts Per
Unit AreaNumber of Galaxy Redshifts + Failures Per Unit Area
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
showing 50 to 100%MEDIAN ~ 60 %
Progress in Each Strip
There are 1564 fields on the sky:
STRIP A
– 651 (42%) have been observed,
– 913 (58%) remain. (as of June 2003)
Coverage by strip: STRIP A 547 fields 161 observed (29%) 386 remain
STRIP B (595 fields) 428 observed (72%) 167 remain
STRIP C (422 fields) 62 observed (15%) 360 remain
Progress in Each Strip
There are 1564 fields on the sky:
STRIP A
STRIP B
– 651 (42%) have been observed,
– 913 (58%) remain. (as of June 2003)
Coverage by strip: STRIP A 547 fields 161 observed (29%) 386 remain
STRIP B 595 fields 428 observed (72%) 167 remain
STRIP C (422 fields) 62 observed (15%) 360 remain
Progress in Each Strip
There are 1564 fields on the sky:
STRIP A 547 fields 161 observed (29%) 386 remain
STRIP B 595 fields 428 observed (72%) 167 remain
STRIP C 422 fields 62 observed (15%) 360 remain
STRIP A
STRIP B
STRIP C
– 651 (42%) have been observed,
– 913 (58%) remain. (as of June 2003)
Coverage by strip:
Data Releases
Initial release of ~13000 galaxies in December 2002
Next data release planned for the end 2003/start 2004
http://www-wfau.roe.ac.uk/6dFGS/6dF Galaxy Survey Database
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/
http://www-wfau.roe.ac.uk/6dFGS/ 6dFGS Online Database –
K-band Redshift Completeness and Observed Fields
Fields Observed and Those Remaining
STRIP A
STRIP B
STRIP C
K-band Completeness and Fields Observed
K-band Completeness and Remaining Fields
Redshift Progress On Individual Samples Sample Sources Redshifts Coverage
2MASS Ks < 12.75 113988 43226 38 %
2MASS H < 13.05 3283 524 16
2MASS J < 13.75 2008 319 16
SuperCOSMOS rF < 15.7 9199 2690 30
SuperCOSMOS bJ < 17.0 9749 2446 25
Shapley 939 177 19
ROSAT All-Sky Survey 2913 448 15
HIPASS (> 4-sigma) 821 194 24
IRAF Faint Source Catalogue 10707 2341 22
Denis J < 14 1505 151 10
Denis I < 15 2017 179 9
2MASS AGN 2132 111 5
Hamburg-ESO Survey 3539 146 4
SUMSS 4475 544 12
Shanks et al. 466 62 13
NOAO-VLA Sky Survey 4334 224 5
40% coveragedown to 4%
BOTH 6DF AND LITERATURE REDSHIFTS
Redshift Progress On Individual Samples - Breakdown
Sample Sources 6dF Redshifts
Literature Redshifts
Coverage
2MASS Ks < 12.75 113988 23551 19675 38 %
2MASS H < 13.05 3283 263 261 16
2MASS J < 13.75 2008 164 155 16
SuperCOSMOS rF < 15.7 9199 850 1840 30
SuperCOSMOS bJ < 17.0 9749 989 1457 25
Shapley 939 88 89 19
ROSAT All-Sky Survey 2913 212 236 15
HIPASS (> 4-sigma) 821 69 125 24
IRAF Faint Source Catalogue 10707 752 1589 22
Denis J < 14 1505 62 89 10
Denis I < 15 2017 49 130 9
2MASS AGN 2132 76 35 5
Hamburg-ESO Survey 3539 94 52 4
SUMSS 4475 302 242 12
Shanks et al. 466 1 61 13
NOAO-VLA Sky Survey 4334 208 16 5
