Large Area Survey ofLarge Area Survey ofLyman Alpha EmittersLyman Alpha Emitters

Zheng Zheng

Yale Center for Astronomy and Astrophysics

Yale/WIYN One Degree Imager Survey Workshop Oct 3rd, 2009

ODI Survey

Adding an Hα narrow-band filter

a lot of Hα related sciences

LAEs

Ouchi et. 2003

Searching for z~4.5 galaxies with prominent Lyα emission

Lyman Alpha Emitters (LAEs)

Ouchi et al. 2008

Broad bands + narrow-bandefficient in selecting LAEs

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ODI survey of LAEs:~10x volume of existing narrow-band surveys

IfSurvey Area: 36 sq. deg.

Hα filter width: 60Å (33 comoving Mpc)

Expect to find 4500±1500 LAEs with LLyα>1042.5erg/s (~0.5L*) at z~4.5

LALA Large Area Lyman Alpha survey (Rhoads et al. 2000)

SXDS Subaru/XMM-Newton Deep Survey (Ouchi et al. 2008)

SDF Subaru Deep Field (Kashikawa et al. 2004)

MUSYC Multiwavelength Survey by Yale-Chile (Gawiser et al. 2007)

• Early galaxy formation

• LAE-LBG connection

• AGN fraction

• Accurate Lyα LF and UV LF

• Lyα EW distribution UV luminosity dependence

• Clustering of LAEs luminosity dependence, 3D

• A large number of Lyman Alpha Blobs• ...

A LARGE sample of z~4.5 LAEs

A LARGE sample of z~4.5 LAEs

Wang et al. 2009LALA

Lyα LF and UV LF, test LAE models

• Early galaxy formation

• LAE-LBG connection

• AGN fraction

• Accurate Lyα LF and UV LF

• Lyα EW distribution UV luminosity dependence

• Clustering of LAEs luminosity dependence, 3D

• A large number of Lyman Alpha Blobs• ...

ZZ et al. 2009

Model

Ando et al. 2006

Dust? Age? Observational effect of small volume?

deficit of UV bright, high Lyα EW sources

A LARGE sample of z~4.5 LAEs

• Early galaxy formation

• LAE-LBG connection

• AGN fraction

• Accurate Lyα LF and UV LF

• Lyα EW distribution UV luminosity dependence

• Clustering of LAEs luminosity dependence, 3D

• A large number of Lyman Alpha Blobs• ...

• Early galaxy formation

• LAE-LBG connection

• AGN fraction

• Accurate Lyα LF and UV LF

• Lyα EW distribution UV luminosity dependence

• Clustering of LAEs luminosity dependence, 3D

• A large number of Lyman Alpha Blobs• ...

A LARGE sample of z~4.5 LAEs

Kavac et al. 2007

LALA z~4.5

Gawiser et al. 2007

MUSYC z~3.1

Subaru Deep Field

z=4.79

Shimasaku et al. 2004

z=4.86

Luminosity dependence: LAE-halo connection, environment

Anisotropic 3D correlation function: environment, strong test for LAE models

ZZ et al. 2009

Model

sample variance

ODI survey of LAEs:

Use non-optimal observing conditions (e.g., 1” seeing).[~250 hours]

with 2” aperture~6hr per field for 5σ detection (LLyα=1042.5erg/s)

36 fields, ~100-200 hours of narrow-band observation, depending on the luminosity threshold we choose.

Observation requirements

ODI - Large Area Survey of Redshift Four and Half Lyman Alpha Emitters

✴ It can be done under non-optimal observing conditions, making a good use of the time. (~200 hrs)

✴ It will have one order of magnitude increase in survey volume.

✴ We expect to detect ~5000 z~4.5 LAEs and many LABs.

✴ A large sample of LAEs would help answer a lot of questions, greatly enhance our understanding of these young galaxies, and provide strong tests of models.

Our Our

Opportunity

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Opportunity

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ODI - Large Area Survey of Redshift Four and Half Lyman Alpha Emitters

LA-So-Re-FaH-LA