High redshift massive galaxies bzks eros @ eis deep3a and cosmos
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High Redshift Massive Galaxies (BzKs & EROs) @ EIS-Deep3a and COSMOS. Xu KONG ( [email protected] 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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High redshift massive galaxies bzks eros @ eis deep3a and cosmos

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

Xu KONG

([email protected] 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


1 introduction

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 !!


2 eis deep3a

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


3 photometric catalog

3. Photometric Catalog

K-band number counts

NIR : Ks band catalog, 104 objects  BzKs & EROs


4 1 high redshift galaxies

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


High z galaxies in our fields

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


High z galaxy number counts

High-z galaxy number counts

  • K=20mag :sBzKs 1.20/arcmin2;pBzKs 0.38/arcmin2


5 1 photometric redshift

5.1 Photometric Redshift

Photometric z

VLT

Spectroscopic z


High redshift massive galaxies bzks eros eis deep3a and cosmos

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


5 2 clustering

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


High redshift massive galaxies bzks eros eis deep3a and cosmos

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


Conclusion

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.


High redshift massive galaxies bzks eros eis deep3a and cosmos

  • 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


Bzks in cosmos

BzKs in COSMOS


Sbzks k 19 8 in vega

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?


Number and sky density

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


Clustering of sbzks

Clustering of sBzKs


High redshift massive galaxies bzks eros eis deep3a and cosmos

EROs in COSMOS (rp-Ks>3.5)


High redshift massive galaxies bzks eros eis deep3a and cosmos

sBzKs

EROs


High redshift massive galaxies bzks eros eis deep3a and cosmos

  • 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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