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K. Ohta (Kyoto Univ.) with I. Iwata (NAOJ, Okayama) M. Ando (Kyoto Univ.) M. Akiyama (NAOJ, Subaru) N. Tamura (Durham, UK) K. Aoki (NAOJ, Subaru). LBG s at z~5. LBG search at GOODS-N and J0053+1234 fields V, I_c, z’ ; z~5 with S-Cam/Subaru Highest redshift achieved with two-color

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lbg at z 5
K. Ohta (Kyoto Univ.)

with

I. Iwata (NAOJ, Okayama)

M. Ando (Kyoto Univ.)

M. Akiyama (NAOJ, Subaru)

N. Tamura (Durham, UK)

K. Aoki (NAOJ, Subaru)

LBGs at z~5
slide2
LBG search at GOODS-N and J0053+1234

fields

V, I_c, z’ ; z~5 with S-Cam/Subaru

Highest redshift achieved with two-color

diagram using standard filter system

Age of 1Gyr and 1Gyr earlier from z~3

slide7
Number density of luminous LBGs does not change so much from z=5 to 3

Fainter LBGs increase at the later epoch

Luminosity-dependent evolution?

However….

Disagreement among UVLFs at z~4, 5

in a luminous part

ly alpha ew vs uv luminosity at z 5
Ly alpha EW vs UV luminosity at z~5

Dusty environment in luminous LBGs?

downsizing of lbgs
Number density of luminous LBGs does not change so much from z=5 to 3

Fainter LBGs at z~3 are late comers?

Luminous z~5 LBGs in dusty environment?

chemically evolved to some degree?

=> lack of blue luminous ones?

Luminous z~5 LBGs show larger clustering amp.

luminous LBGs reside in massive DHs?

=> SF started eariler?

Downsizing of LBGs?
slide15
Large sample of luminous

LBGs will be obtained from

COSMOS

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