Photometric Redshifts in the IRAC Shallow Survey

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Accurate photometric redshifts are calculated for nearly 200,000 galaxies to a 4.5 micron flux limit of {approx} 13 {micro}Jy in the 8.5 deg{sup 2} Spitzer/IRAC Shallow survey. Using a hybrid photometric redshift algorithm incorporating both neural-net and template-fitting techniques, calibrated with over 15,000 spectroscopic redshifts, a redshift accuracy of {sigma} = 0.06 (1+z) is achieved for 95% of galaxies at 0 < z < 1.5. The accuracy is {sigma} = 0.12 (1 + z) for 95% of AGN at 0 < z < 3. Redshift probability functions, central to several ongoing studies of the galaxy population, are computed for the ... continued below

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Brodwin, M; Brown, M; Ashby, M; Bian, C; Brand, K; Dey, A et al. June 13, 2006.

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Accurate photometric redshifts are calculated for nearly 200,000 galaxies to a 4.5 micron flux limit of {approx} 13 {micro}Jy in the 8.5 deg{sup 2} Spitzer/IRAC Shallow survey. Using a hybrid photometric redshift algorithm incorporating both neural-net and template-fitting techniques, calibrated with over 15,000 spectroscopic redshifts, a redshift accuracy of {sigma} = 0.06 (1+z) is achieved for 95% of galaxies at 0 < z < 1.5. The accuracy is {sigma} = 0.12 (1 + z) for 95% of AGN at 0 < z < 3. Redshift probability functions, central to several ongoing studies of the galaxy population, are computed for the full sample. We demonstrate that these functions accurately represent the true redshift probability density, allowing the calculation of valid confidence intervals for all objects. These probability functions have already been used to successfully identify a population of Spitzer-selected high redshift (z > 1) galaxy clusters. We present one such spectroscopically confirmed cluster at <z> = 1.24, ISCS J1434.2+3426. Finally, we present a measurement of the 4.5 {micro}m-selected galaxy redshift distribution.

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PDF-file: 37 pages; size: 0 Kbytes

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  • Journal Name: Astrophysical Journal, vol. 651, no. 2, November 1, 2006, pp. 791-804; Journal Volume: 651; Journal Issue: 2

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  • Report No.: UCRL-JRNL-222422
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 895415
  • Archival Resource Key: ark:/67531/metadc884653

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • June 13, 2006

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  • Sept. 22, 2016, 2:13 a.m.

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  • Nov. 30, 2016, 4:43 p.m.

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Brodwin, M; Brown, M; Ashby, M; Bian, C; Brand, K; Dey, A et al. Photometric Redshifts in the IRAC Shallow Survey, article, June 13, 2006; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc884653/: accessed November 16, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.