Large Area Survey of Lyman Alpha Emitters 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 Searching for z~4.5 galaxies with prominent Lyα emission Lyman Alpha Emitters (LAEs) Ouchi et al Broad bands + narrow-band efficient in selecting LAEs

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 > 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)

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

Wang et al 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...

ZZ et al Model Ando et al 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 LALA z~4.5 Gawiser et al MUSYC z~3.1 Subaru Deep Field z=4.79 Shimasaku et al z=4.86 Luminosity dependence: LAE-halo connection, environment Anisotropic 3D correlation function: environment, strong test for LAE models ZZ et al 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 (L Lyα = erg/s) 36 fields, ~ 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 Opportunity! ODI - Large Area Survey of Redshift Four and Half Lyman Alpha Emitters LA-So-Re-FaH-LA