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High Redshift Massive Galaxies (BzKs & EROs) @ EIS-Deep3a and COSMOS

High Redshift Massive Galaxies (BzKs & EROs) @ EIS-Deep3a and COSMOS. Xu KONG ( xkong@optik.mtk.nao.ac.jp NAOJ) collaborators ： E. Daddi, N. Arimoto, A. Renzini, K. Ohta ， T. Broadhurst ， A. Cimatti ， C. Ikuta ， L. Costa, L. Olsen, M. Onodera ， N. Tamura.

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High Redshift Massive Galaxies (BzKs & EROs) @ EIS-Deep3a and COSMOS

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  1. High Redshift Massive Galaxies (BzKs & EROs) @ EIS-Deep3a and COSMOS Xu KONG (xkong@optik.mtk.nao.ac.jp NAOJ) collaborators： E. Daddi, N. Arimoto, A. Renzini, K. Ohta， T. Broadhurst，A. Cimatti，C. Ikuta， L. Costa, L. Olsen, M. Onodera，N. Tamura 2005-05-25 @ Kyoto

  2. 1. Introduction • NIR Surveys • HDF (2x5.3 arcmin2) UDF (5.76 arcmin2) SDF (4.0 arcmin2) • K20 (52.0 arcmin2) SXDF (114.0 arcmin2) GOODS (160.0arcmin2) • Limited: small sky area (high-z galaxy clustering) • Step forward : ~1000 arcmin2 NIR survey ~ COSMOS !!

  3. 2. EIS-Deep3a • Fields • Deep3a-F: 320 arcmin2 (Ks<20.0 mag) • Daddi-F : 600 arcmin2 (Ks<18.8 mag); 450 arcmin2 (Ks<19.2 mag) • Observation：Image＋Spectroscopy • Imaging：optical＋NIR (Subaru +NTT) • NAOJ 8.2m SUBARU telescope: B,R,I and z' 2003 • ESO 3.5m NTT telescope : J and Ks 2001 • BRIzJK and U877,U841,V843 • Spectroscopy： optical＋NIR (VLT + Subaru) hundreds optical spectra, >10 NIR spectra

  4. 3. Photometric Catalog K-band number counts NIR : Ks band catalog, 104 objects  BzKs & EROs

  5. 4.1 High redshift galaxies a) BzKs at 1.4≤z≤2.5 Daddi et al. (2004, ApJ, 617,746) K20 Survey：VLT Large Program • 50. arcmin2 • ~ 500 spectra • SFGs BzK> -0.2 sBzKs pBzKs BzK=(z-K)AB-(B-z)AB BzK >-0.2 : sBzKs BzK<-0.2 & z-K>2.5 : pBzKs b) EROs R-K>5.0

  6. High-z Galaxies In Our fields SFGs at z>1.4 (sBzKs) Passive galaxies at z>1.0 (pBzKs) EROs: R-K>5.0 Galaxies at z<1.4 Stars • Deep3a-F: • 380 sBzKs • 122 pBzKs • 750 EROs • Daddi-F: • 120 sBzKs • 40 pBzKs • 350 EROs

  7. High-z galaxy number counts • K=20mag :sBzKs 1.20/arcmin2;pBzKs 0.38/arcmin2

  8. 5.1 Photometric Redshift Photometric z VLT Spectroscopic z

  9. Redshift (photo_z) Distribution EROs BzKs z ~1.0 BzK selection is a quite powerful way to separategalaxies at 1.4<z<2.5 z ~1.8

  10. 5.2 Clustering Clustering of field galaxies Amplitudes ~ published values • Clustering of EROs • A ~ published values • K fainter, A decrease • Clustering of BzKs • A is large • K fainter, A decrease BzKs are strong clustering! Landy & Szalay (1993) w(q)= (DD-2DR+RR)/RR＝Aq-d d=0.8

  11. 5.4 E(B-V) SFR Mass • sBzKs are dusty galaxies : E(B-V) ~ 0.4 • sBzKs have high SFRs : SFR ~ 190 M/yr • Most BzKs are massive galaxies : M ~ 1.0E11 M • SFRD at z~2 : 0.059 M/yr • Mass densities : logρ*=7.7 M Mpc-3 • M*>1.0e11 : n(pBzKs) = n(pBzKs) = 0.5 n(E/S0) = 4.0*10-4Mpc-3

  12. Conclusion • BzK selection is a quite powerful way to separategalaxies at 1.4<z<2.5. • BzKs are likely to be possible precursors of z～1 EROs and z=0 elliptical galaxies. Massive, high-z, strong clustering, high SFR, and high metallicity. Kong, Daddi, Arimoto, Renzini, et al. 2005, submitted to ApJ.

  13. Mobasher & Capak May05 (i<26) • Sample selection: • RA,DEC: 1.3x1.3 • Ks<19.8 • Mask=0 • Non-saturated • Subaru B • Subaru z’ • KPNO Ks • mask

  14. BzKs in COSMOS

  15. sBzKs (K<19.8 in Vega) • 10% low redshift BzKs (z<1.0) • What are the reasons? • More templates? • J or H band catalog? • mask?

  16. Number and sky density Sky density of pBzKs in COSMOS is less than that of in Deep3a i<26 mag catalog be used  full catalog

  17. Clustering of sBzKs

  18. EROs in COSMOS (rp-Ks>3.5)

  19. sBzKs EROs

  20. We are working on COSMOS … • sBzKs/pBzKs/EROs sampling • Number counts of BzKs/EROs • Clustering for BzKs/EROs • Cosmic variances of clustering • E(B-V), SFR, stellar mass of sBzKs, SFRD at z~2 We will do on COSMOS … BzKs : 1.4<z<2.5 • High-z cluster candidates • Morphology of BzKs • Hubble sequence at z~2 • LF from z=1.4 to 2.5

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