1. SDSS-2dF LRG Survey and the prospects for its UKIDSS-DXS counterpart
Alastair Edge
and SDSS-2dF team
Kyoto 13th January 2004

2. LRG = Luminous Red Galaxy
Luminous = Massive, most likely elliptical
Red = old, evolved stellar population
These two properties make LRGs
excellent tracers of large scale
structure and of galaxy evolution
LRGs targeted in SDSS out to z=0.4
Kyoto 13th January 2004

3. SDSS-2dF LRG Survey
Extension of SDSS program which is limited by 45min SDSS exposures
Approx 150 candidates per 2dF field and with 4hrs exposures we reach i=19.5
Colour selection gives >60% z>0. 5
Got 8 PATT nights in 03A (plus 4 Directors nights in April), 8 in 03B and another 8 in 04A plus 36 from ATAC over next 4 semesters (04A to 05B).
Kyoto 13th January 2004

4. Results 10 clear nights of 24 with very variable conditions!
Observed 19 fields with a total of 2,500 galaxy spectra
Redshifts to 0.79
Kyoto 13th January 2004

5. More Results OII is common E+A signatures seen in some objects
Strong clustering is seen
Kyoto 13th January 2004

6. Next Request for 28 nights over next 3 semesters from PATT
Aim to obtain 10,000+ galaxies z>0.45
Determine LSS at z=0.5, power spectrum, galaxy evolution limits, etc
Link to UKIDSS LAS in first 2 years
Co-add spectra to get stellar ‘ages’
QSOs in same field (PI Shanks)
Kyoto 13th January 2004

7. Other future work 8m studies selected 2dF LRG galaxies
AAOmega survey in z= range
Clusters in SDSS-2dF make a potentially complete sample for cluster evolution
Kyoto 13th January 2004

8. UKIDSS DXS Goal of mapping the Universe at z=1-2
35 sq.deg. to J=23 and K=21 (12.6sq.deg. in 2yrs)
SuprimeCam imaging (next talk!)
4 fields – XMM-LSS, Lockman Hole, ELAIS-N1, SA22
Clustering, clusters etc…. (see Tanaka)
“Old” science goals….? Much still to do.
Kyoto 13th January 2004

9. Possible FMOS LRG Survey
The UKIDSS DXS provides an ideal dataset for a similar “red” galaxy selection at z>1.
The optical/NIR selection will allow reliable samples of ‘passive’ objects to be identified (see Tamura tomorrow!)
FMOS sensitivity will reach a similar absolute magnitude range as the SDSS-2dF sample.
Kyoto 13th January 2004

10. Conclusions The Universe at z<0.8 is accessible from a 4m
Much more at z>1 will be reached by FMOS
In future can study ‘old’ stellar populations over 10Gyr
Kyoto 13th January 2004