Large Area Survey of Lyman Alpha Emitters Zheng Yale Center for Astronomy and Astrophysics Yale/WIYN...
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Transcript of Large Area Survey of Lyman Alpha Emitters Zheng Yale Center for Astronomy and Astrophysics Yale/WIYN...
![Page 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.](https://reader035.fdocuments.in/reader035/viewer/2022081519/56649e535503460f94b49f3e/html5/thumbnails/1.jpg)
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
![Page 2: Large Area Survey of Lyman Alpha Emitters Zheng Yale Center for Astronomy and Astrophysics Yale/WIYN One Degree Imager Survey Workshop Oct 3rd, 2009.](https://reader035.fdocuments.in/reader035/viewer/2022081519/56649e535503460f94b49f3e/html5/thumbnails/2.jpg)
ODI Survey
![Page 3: Large Area Survey of Lyman Alpha Emitters Zheng Yale Center for Astronomy and Astrophysics Yale/WIYN One Degree Imager Survey Workshop Oct 3rd, 2009.](https://reader035.fdocuments.in/reader035/viewer/2022081519/56649e535503460f94b49f3e/html5/thumbnails/3.jpg)
Adding an Hα narrow-band filter
a lot of Hα related sciences
![Page 4: Large Area Survey of Lyman Alpha Emitters Zheng Yale Center for Astronomy and Astrophysics Yale/WIYN One Degree Imager Survey Workshop Oct 3rd, 2009.](https://reader035.fdocuments.in/reader035/viewer/2022081519/56649e535503460f94b49f3e/html5/thumbnails/4.jpg)
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
![Page 5: Large Area Survey of Lyman Alpha Emitters Zheng Yale Center for Astronomy and Astrophysics Yale/WIYN One Degree Imager Survey Workshop Oct 3rd, 2009.](https://reader035.fdocuments.in/reader035/viewer/2022081519/56649e535503460f94b49f3e/html5/thumbnails/5.jpg)
Text
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)
![Page 6: Large Area Survey of Lyman Alpha Emitters Zheng Yale Center for Astronomy and Astrophysics Yale/WIYN One Degree Imager Survey Workshop Oct 3rd, 2009.](https://reader035.fdocuments.in/reader035/viewer/2022081519/56649e535503460f94b49f3e/html5/thumbnails/6.jpg)
• 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
![Page 7: Large Area Survey of Lyman Alpha Emitters Zheng Yale Center for Astronomy and Astrophysics Yale/WIYN One Degree Imager Survey Workshop Oct 3rd, 2009.](https://reader035.fdocuments.in/reader035/viewer/2022081519/56649e535503460f94b49f3e/html5/thumbnails/7.jpg)
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• ...
![Page 8: Large Area Survey of Lyman Alpha Emitters Zheng Yale Center for Astronomy and Astrophysics Yale/WIYN One Degree Imager Survey Workshop Oct 3rd, 2009.](https://reader035.fdocuments.in/reader035/viewer/2022081519/56649e535503460f94b49f3e/html5/thumbnails/8.jpg)
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• ...
![Page 9: Large Area Survey of Lyman Alpha Emitters Zheng Yale Center for Astronomy and Astrophysics Yale/WIYN One Degree Imager Survey Workshop Oct 3rd, 2009.](https://reader035.fdocuments.in/reader035/viewer/2022081519/56649e535503460f94b49f3e/html5/thumbnails/9.jpg)
• 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
![Page 10: Large Area Survey of Lyman Alpha Emitters Zheng Yale Center for Astronomy and Astrophysics Yale/WIYN One Degree Imager Survey Workshop Oct 3rd, 2009.](https://reader035.fdocuments.in/reader035/viewer/2022081519/56649e535503460f94b49f3e/html5/thumbnails/10.jpg)
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
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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
!
Opportunity
!
ODI - Large Area Survey of Redshift Four and Half Lyman Alpha Emitters
LA-So-Re-FaH-LA