Deep Survey of z=7 Lyα Emitters with the new red-sensitive CCDs on Subaru / Suprime-Cam
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Deep Survey of z=7 Lyα Emitters with the new red-sensitive CCDs on Subaru / Suprime-Cam. Kazuaki Ota Cosmic Radiation Laboratory RIKEN M. Iye, N. Kashikawa (NAOJ), M. Ouchi (Carnegie), K. Shimasaku (Univ. of Tokyo), T. Totani (Kyoto Univ.), M.A.R. Kobayashi, T. Morokuma (NAOJ),

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Deep Survey of z=7 Lyα Emitters with the new red-sensitive CCDs on Subaru / Suprime-Cam

Kazuaki OtaCosmic Radiation LaboratoryRIKEN

M. Iye, N. Kashikawa (NAOJ), M. Ouchi (Carnegie),

K. Shimasaku (Univ. of Tokyo), T. Totani (Kyoto Univ.),

M.A.R. Kobayashi, T. Morokuma (NAOJ),

M. Nagashima (Nagasaki Univ.),

H. Furusawa, T. Hattori (SubaruTelescope),

N. Kodaka, A. Harayama (Saitama Univ.)

Reionization @ Ringberg


Outline
Outline CCDs on Subaru / Suprime-Cam

I. Background & Motivation

(1) Reionization probed by Lyα emitters at z ≿ 6

(2) Weaknesses in the previous z=7 Lyα emitter survey

II. Solution:

- New deeper z=7 survey in SXDS Field

III. Result:

- Deeper Lyα LF and Constraint on XHI

IV. Conclusion


Outline1
Outline CCDs on Subaru / Suprime-Cam

I. Background & Motivation

(1) Reionization probed by Lyα emitters at z ≿ 6

(2) Weaknesses in the previous z=7 Lyα emitter survey

II. Solution:

- New deeper z=7 survey in SXDS Field

III. Result:

- Deeper Lyα LF and Constraint on XHI

IV. Conclusion


Neutral Fraction vs Redshift CCDs on Subaru / Suprime-Cam

Neutral Fraction XHI

z=6.3, 6.7

z=7z=6.6Lyα Emitters

Redshift z

Fan et al.2006


Reionization Probed by Lyα emitters: Lyα LF CCDs on Subaru / Suprime-Cam

LyαLFdeclines.

Number & Lyα luminosity

density decrease.

n(z=6.6)/n(z=5.7)=0.24

n(z=7.0)/n(z=6.6)=0.17

to L(Lya) > 1043 erg/s

Subaru Deep Field

Project

Subaru Telescope

Suprime-Cam


3 CCDs on Subaru / Suprime-Camweakneses in the previous z=7 survey

(1) Depth was shallow.

(2) Sample is small.

(3) Only one sky field was surveyed.

Subaru Deep Field876 arcmin2

L(Lyα) > 1043 erg/s

Only 1 Lyα emitter


Outline2
Outline CCDs on Subaru / Suprime-Cam

I. Background & Motivation

(1) Reionization probed by Lyα emitters at z ≿ 6

(2) Weaknesses in the previous z=7 Lyα emitter survey

II. Solution:

- New deeper z=7 survey in SXDS Field

III. Result:

- Deeper Lyα LF and Constraint on XHI

IV. Conclusion


New fully depleted CCDs on Subaru / Suprime-Cam CCDs on Subaru / Suprime-CamMore sensitive to 0.9 – 1 μm light

Transmission, QE, flux

Wavelenght (A)

>2 x more sensitive to z=7 Lyα


S ubaru x mm newton d eep s urvey field sxds

Target Sky Region CCDs on Subaru / Suprime-Cam

Subaru/XMM-NewtonDeep Survey Field(SXDS)

Spitzer

13 hours imagingNB973 = 25.4 (5σ)(previously, 24.9)

UKIDSS-UDS

Oct, Nov 2008SubaruThis Work


Narrowband filter to detect z=7 Lyα emitters CCDs on Subaru / Suprime-Cam

Filter Response

z=7Lyα

NB973

Wavelength(Å)

λc=9755Å⊿λ=200Å


New z=7 Lyα emitter candidates CCDs on Subaru / Suprime-Cam

B V R i’ NB816 z’ NB921 NB973

No detection (< 3σ)

NB973 ≤ 25.4 (5σ)

Equivalently, z’ – NB973 > 1

~


Color Selection CCDs on Subaru / Suprime-Cam

Visual Inspection

10z=7 Lyα emittercandidates

(tentative)

Remove spurious

& transient objects

using images taken

in different months

#Candidates ≤ 10


Outline3
Outline CCDs on Subaru / Suprime-Cam

I. Background & Motivation

(1) Reionization probed by Lyα emitters at z ≿ 6

(2) Weaknesses in the previous z=7 Lyα emitter survey

II. Solution:

- New deeper z=7 survey in SXDS Field

III. Result:

- Deeper Lyα LF and Constraint on XHI

IV. Conclusion


Neutral fraction z 7 0 49

Lyα Luminosity Function CCDs on Subaru / Suprime-CamAssumption (1): F(Lyα) = F(NB filter)

Neutral Fractionz=7.0~49%

■△ z=5.7

●▲ z=6.6

◆ z=7.0

xHI=0.0

Observed DensitiesnLyα: 3.9x10-5 Mpc-3

ρLyα: 4.7x1038 erg/s/Mpc-3

xHI=0.4

xHI=0.6

Predicted Densities

when xHI=0(Kobayashi et al. 2007

LAE evolution Model)nLyα: 1.1x10-4 Mpc-3

ρLyα: 9.5x1038 erg/s/Mpc-3

Attenuated Schechter LFs(Santos 2004)

>6x1042 erg/s


Fraction of Lyα flux in NB filter flux CCDs on Subaru / Suprime-Cam

F(Lyα) ~ 0.7 x F(NB973)

NB973 Filter Total Flux

Spectrum

F(Lyα)

70%

F(Lyα)

30%

F(UV)

F(NB973)= F(Lya) + F(UV)


Neutral fraction z 7 0 66

Lyα Luminosity Function: CCDs on Subaru / Suprime-Cam Assumption (2): F(Lyα) = 0.7 x F(NB973)

Neutral Fractionz=7.0~66%

■△ z=5.7

●▲ z=6.6

◆ z=7.0

xHI=0.0

Observed DensitiesnLyα: 3.9x10-5 Mpc-3

ρLyα: 4.7x1038 erg/s/Mpc-3

xHI=0.4

xHI=0.6

Predicted Densities

when xHI=0(Kobayashi et al. 2007

LAE evolution Model)nLyα: 1.8x10-4 Mpc-3

ρLyα: 1.2x1039 erg/s/Mpc-3

Attenuated Schechter LFs(Santos 2004)

>4.2x1042 erg/s


Neutral Fraction vs Redshift CCDs on Subaru / Suprime-Cam

Neutral Fraction XHI

z=6.3, 6.7

z=7z=6.6Lyα Emitters

Redshift z

Fan et al.2006


Outline4
Outline CCDs on Subaru / Suprime-Cam

I. Background & Motivation

(1) Reionization probed by Lyα emitters at z ≿ 6

(2) Weaknesses in the previous z=7 Lyα emitter survey

II. Solution:

- New deeper z=7 survey in SXDS Field

III. Result:

- Deeper Lyα LF and Constraint on XHI

IV. Conclusion


Conclusion CCDs on Subaru / Suprime-Cam

Improved statistics & depth, Observed different sky field

(1) Number & Lyα luminosity densities

of Lyα emitters decrease from z=5.7

and 6.6 to z=7.

(2) Neutral Fraction at z=7 is

XHI≿ 0.49 – 0.66.

(3) Reionization seems not to be

complete at z=7.


We are now challenging z=7.3 Lyα CCDs on Subaru / Suprime-Cam

Transmission, QE, flux

Wavelenght (A)

Final survey that can be done by Suprime-Cam + New CCDs


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