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

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

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

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

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

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

Other future work 8m studies selected 2dF LRG galaxies AAOmega survey in z=0.6-1.0 range Clusters in SDSS-2dF make a potentially complete sample for cluster evolution Kyoto 13th January 2004

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

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

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