Post on 23-Feb-2016
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Search for High-Redshift Galaxies
Wei Zheng
Johns Hopkins University
Granada
Power of CLASH Survey
• Data in about 300 square arcminutes: comparable to GOODS
• Data in about 100 square arcminutes in cluster fields: comparable to HUDF
• Accurate photometric redshifts and mass distribution maps enhance selection confidence
September 21, 2010
September 21, 2010
Faintness of High-Z Galaxies
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Redshift 6 8 10m* ~ 26.5 ~27.8 ~29.2Number in UDF ~1000 ~30 ?
Spectroscopic capability of ground based telescopes: AB≈25Spectroscopic capability of JWST: AB≈27
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New Findings in A1703
HJzi
Granada
Goals
• Find more than 100 galaxies at z>7• Spectroscopic followup of bright candidates• Morphology of young galaxies• Complimentary study of the luminosity
distribution• Pathfinder for JWST studies of high-z galaxies
September 21, 2010
September 21, 2010
Cluster MACS J1149+22
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Color Selection
September 21, 2010
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Special Pipeline
• Detection Images from the reddest bandsF160W: z≈10.5F160W+F140W: z≈9F160W+F140W+F125W: z≈8F160W+F140W+F125W+F110W: z≈6.5
• Catalogs in each passband• Dropout catalog• Stamp images for inspection
September 21, 2010
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Working Group
• Assignment: Adopt a cluster• Quick report within a week of data acquisition• Prompt publication within a month• Statistical studies at longer time scales
September 21, 2010
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Test Runs
• Using published results:UDFA2218
• SED fitting• amplification map
September 21, 2010
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Spectroscopic Followup
• VLT: X-shooter, SINFONI, ISSAC• Magellan: FIRE• GEMINI-N: GNIRS, FLAMINGO-2• Letter of intention to the director?
September 21, 2010
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Summary
• CLASH provides an unprecedented opportunity for high-z search
• Selection procedures to be developed and tested
• Prompt publication is essential
September 21, 2010