The NEWFIRM Medium-Band Survey: Filter Definitions and First Results - Astrophysics > Cosmology and Nongalactic AstrophysicsReport as inadecuate




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Abstract: Deep near-infrared imaging surveys allow us to select and study distantgalaxies in the rest-frame optical, and have transformed our understanding ofthe early Universe. As the vast majority of K- or IRAC-selected galaxies is toofaint for spectroscopy, the interpretation of these surveys relies almostexclusively on photometric redshifts determined from fitting templates to thebroad-band photometry. The best-achieved accuracy of these redshiftsDeltaz-1+z ~ 0.06 at z>1.5, which is sufficient for determining the broadcharacteristics of the galaxy population but not for measuring accuraterest-frame colors, stellar population parameters, or the local galaxy density.We have started a near-infrared imaging survey with the NEWFIRM camera on theKitt Peak 4m telescope to greatly improve the accuracy of photometric redshiftsin the range 1.51.5in the COSMOS and AEGIS fields. The filter set also enables efficient selectionof exotic objects such as high redshift quasars, galaxies dominated by emissionlines, and very cool brown dwarfs; we show that late T and candidate -Y- dwarfscould be identified using only two of the filters.



Author: Pieter G. van Dokkum, Ivo Labbe, Danilo Marchesini, Ryan Quadri, Gabriel Brammer, Katherine E. Whitaker, Mariska Kriek, Marijn Fr

Source: https://arxiv.org/



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