1 / 23

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.

sunila
Download Presentation

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

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related