1. Large Area Survey of Lyman Alpha Emitters Zheng Yale Center for Astronomy and Astrophysics Yale/WIYN One Degree Imager Survey Workshop Oct 3rd, 2009

2. ODI Survey

3. Adding an Hα narrow-band filter a lot of Hα related sciences

4. 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-band efficient in selecting LAEs

5. Text ODI survey of LAEs: ~10x volume of existing narrow-band surveys If Survey Area: 36 sq. deg. Hα filter width: 60Å (33 comoving Mpc) Expect to find 4500 ± 1500 LAEs with L Lyα >10 42.5 erg/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)

6. 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

7. Wang et al. 2009 LALA 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...

8. 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...

9. 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

10. ODI survey of LAEs: Use non-optimal observing conditions (e.g., 1” seeing). [~250 hours] with 2” aperture ~6hr per field for 5σ detection (L Lyα =10 42.5 erg/s) 36 fields, ~100-200 hours of narrow-band observation, depending on the luminosity threshold we choose. Observation requirements

11. 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 Opportunity! ODI - Large Area Survey of Redshift Four and Half Lyman Alpha Emitters LA-So-Re-FaH-LA